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Category Archives: TOOL STEEL

O1 Tool Steel | 1.2510 | 100MnCrW4 | SKS3

What Exactly Is O1  Steel?

Let’s start with a simple truth: O1 steel is not a mystery. It is a low-alloy, cold-work tool steel that must be oil-quenched during heat treatment. That is why many engineers simply call it “oil-hardening steel.”

Think of it this way: If water-hardening steels are like racing bikes—fast but brittle—then O1 is like a luxury sedan. Smooth, predictable, and forgiving.

Tools and dies made from O1 flat bars or round bars deliver good wear resistance and strong abrasive qualities. Why? Because the tungsten and higher chromium content work together like a shield against friction. In addition, ASTM A681 O1 tool steel offers deep hardening properties, a fine grain structure, and unusual toughness for its class.

Here is a rhetorical question for you: *Would you trust a brittle die to run a 10,000-part production run?* Probably not. That is exactly why machinists and toolmakers choose O1.

At Dongguan Otai Special Steel, we are not just another supplier. We are a better choice—offering reliable quality, responsive sales service, and full traceability. Our AISI O1 tool steel is available in decarb-free rounds, flats, squares, ground flat stock, and drill rod. Need a custom size? We deliver.


1. Supply Range of AISI O1 Tool Steel (What We Actually Stock)

No more searching for sizes that do not exist. Here is our real inventory:O1 steel flat bar

Form Size Range
Round Bar Diameter 8mm – 350mm
Plate / Flat Bar Thickness 8mm – 300mm x Width 200mm – 800mm
Custom Sizes As per your drawing
Surface Finish Black, rough machined, turned, or precision ground

Need something outside this range? Just ask. We cut, grind, and ship globally.


2. Relevant Steel Specifications of AISI O1 Tool Steel

You may see different names on different blueprints. Do not let that confuse you. Here are the direct equivalents we supply at Otai:

Country Standard Grade
USA ASTM A681 O1
Germany DIN EN ISO 4957 1.2510 / 100MnCrW4
Japan JIS G4404 SKS3

So, if your customer asks for 1.2510 or SKS3, relax. You have found the right material.


3. Chemical Composition & Equivalents (The Honest Recipe)

Why does O1 perform so consistently? Because its chemistry is balanced like a good recipe. Let me show you the numbers we certify:

Standard C Mn Si Cr V W
ASTM A681 O1 0.85-1.00 1.00-1.40 0.10-0.50 0.40-0.70 Max 0.30 0.40-0.60
DIN 1.2510 0.90-1.05 1.00-1.20 0.15-0.35 0.50-0.70 0.05-0.15 0.50-0.70
JIS SKS3 0.90-1.00 0.90-1.20 Max 0.35  0.50-1.00 0.50-1.00

SKS3 /O1 STEEL-OTAI

Notice the tungsten (W) and chromium (Cr)? Those are your wear-resistant heroes. They give O1 its edge-holding ability without making it impossible to machine.


4. Mechanical Properties (What You Really Care About)

Let’s skip the fluff. Here is how O1 performs under real shop conditions:

Property Metric Imperial
Hardness, Brinell (soft annealed) 190 HB 190 HB
Hardness Rockwell C (tempered 300-1200°F) 34 – 64 HRC 34 – 64 HRC
Elastic modulus (hardened to 62 HRC) 193 GPa 28,000 ksi
Compressive yield strength @ 60 HRC 2150 MPa 312,000 psi

Have you ever calculated how much downtime a broken punch costs you? A higher compressive strength means fewer surprises.


5. Physical & Thermal Properties

Property Metric Imperial
Density (hardened to 62 HRC) 7.81 g/cm³ 0.282 lb/in³
Melting point 1421°C 2590°F
Thermal expansion (20-260°C) 10.6 x 10⁻⁶/°C

These numbers matter when you are designing dies that run hot or cold. O1 stays stable.


6. Forging – Do It Right, or Pay Twice

Heat O1 slowly and uniformly. Forging temperature: 980-1000°C. Do not forge below 800°C. After forging, cool slowly in lime, dry ashes, or a furnace. Then—and this is critical—always anneal before re-hardening.

Think of it like baking bread: Skip the resting step, and the texture fails. Same logic applies here.


7. Heat Treatment – The Heart of O1  Steel Performance

Anneal (Softening)

Heat slowly (max 222°C per hour) to 802-816°C. Hold 1 hour per 25mm thickness (2 hours minimum). Cool slowly with the furnace at max 28°C per hour down to 538°C, then air cool. Result: max 212 HB.

Hardening (Making It Strong)

  • Preheat: 1100-1200°F

  • Austenitize: 1475-1500°F. Soak 30 minutes per inch of thickness.

  • Quench: In warm oil. Cool until 125-150°F (or until you can hold it in a bare hand).

  • Temper immediately. Yes, immediately. Do not wait.

Tempering

Single temper is usually enough. But double tempering? Sometimes better. Soak 2 hours per inch of thickness each time. Air cool between tempers. Normal range: 300-450°F.

Stress Relief After Grinding or EDM

Use a temperature 25-50°F lower than your last tempering temperature. This small step prevents cracking. Ignore it at your own risk.


8. Applications – Where Does O1 Actually Shine?

O1 is designed for short to medium run tooling at ambient temperatures. Think of it as the reliable employee who never complains.

Typical applications include:

  • Blanking dies

  • Forming dies

  • Trim dies

  • Gauges

  • Slitting cutters

  • Punches

  • Bolster dies

  • Knock-out pins

  • Thread roll dies

  • Bending dies

  • Plastic mold dies (short runs)

  • Shims, cams, machine ways

  • Jigs and cutter templates

  • Swaging dies

*Can you use O1 for high-speed stamping of abrasive materials?* Probably not—that is D2 or M2 territory. But for everyday precision tooling? O1 is your answer.


9. Why Otai Is a Better Choice

You have many options for buying tool steel. I will give you three reasons to choose us:

  1. Reliable quality. Every batch comes with a mill test certificate. No guessing.

  2. Real stock. Not a virtual inventory. We hold actual rounds, flats, plates, and ground stock.

  3. Sales service that responds. Ask a question. Get an answer. Simple.

We also offer promotions and O1 tool steel for sale regularly. Want to know the current price? Just leave a comment below or send us an enquiry.


Final Word – Let’s Talk

O1 steel is not glamorous. It does not have the highest wear resistance or the longest tool life of all steels. But it offers something better: predictability, ease of heat treatment, and forgiving machining.

If you are building short-run tooling, jigs, or punches, O1 will save you time and frustration.

So, here is my final question: *Why struggle with complicated air-hardening steels or brittle water-hardening grades when O1 sits right in the sweet spot?*

Request your quote today. Tell us your size, quantity, and delivery port. We will respond within 4 hours.

Dongguan Otai Special Steel – Your precision starts with our material.

 

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DIN 1.2767 /45NiCrMo16/X45NiCrMo4 /SKT 5 Steel

Have you ever tried to bend a steel bar that simply refuses to move? That is the kind of resistance we are talking about with DIN 1.2767. In the world of tool steels, this material is not just another player on the bench—it is the heavyweight champion of toughness and strength.

So, what exactly is DIN 1.2767 steel ? In simple terms, it is a nickel-chromium-molybdenum alloyed steel. It is often referred to by its common alias: 45NiCrMo16. Think of it as the steel equivalent of a reinforced concrete beam—strong on its own, but with a hidden structure that makes it nearly unbreakable under impact.

Standard and Equivalents

DIN1.2767/45NiCrMo16  steel -Otai
Standard Grade Name
DIN (Germany)  1.2767
AISI (USA) 6F7 (similar, but not identical)
JIS (Japan) SKT 5
Other Common Name 45NiCrMo16/ X45NiCrMo4

A quick note: while 1.2767 behaves similarly to AISI 6F7, we always recommend verifying your specific application requirements. Let’s just say they are cousins, not twins.

Chemical Composition  (wt%)

Below is the typical chemical composition range for DIN 1.2767 (45NiCrMo16) as per DIN ISO 4957 standard. Then, we will place it side-by-side with two common comparable grades: AISI 6F7 and JIS SKT5.

Element DIN 1.2767 (45NiCrMo16) AISI 6F7 JIS SKT5
Carbon (C) 0.40–0.50% 0.45–0.55% 0.35–0.45%
Silicon (Si) 0.10–0.40% 0.20–0.50% 0.10–0.40%
Manganese (Mn) 0.20–0.50% 0.50–0.90% 0.30–0.60%
Chromium (Cr) 1.20–1.50% 1.20–1.50% 1.00–1.30%
Molybdenum (Mo) 0.15–0.35% 0.25–0.35% 0.15–0.30%
Nickel (Ni) 3.80–4.30% 1.30–1.80% 3.50–4.00%
Vanadium (V) 0.80–1.10%

Why does this matter? The high nickel content is the secret sauce. It gives the steel extraordinary ductility—imagine stretching a rubber band versus snapping a twig. 1.2767 bends before it breaks.

Mechanical Properties (Heat Treated)

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HRC)
Soft Annealed ~800 ~550 ~15 Max 285 HB (~22 HRC)
Hardened & Tempered 1200–1420 980–1180 7–10 Min 52 HRC (typical)

Technical Properties Worth Knowing

  • High hardenability: Air or oil quenching works beautifully. No need for water quenching, which reduces distortion.

  • Excellent polishability: Perfect for plastic mold cavities that need a mirror finish.

  • Good wear resistance: Not in the D2 or M2 class, but more than enough for high-impact applications.

Typical Application

Where would you actually use DIN 1.2767 steel ? Imagine high-stress tools like:

  • Injection molding tooling for abrasive plastics (e.g., glass fiber reinforced)

  • Shearing blades

  • Master molds and dies

  • Extrusion tools

  • Calendering rolls

In other words, if your tool takes repeated heavy punches, DIN 1.2767 steel is your ring. It is also widely used in automotive stamping dies and food processing machinery where both strength and corrosion resistance (from nickel) matter.

Available Sizes from Otai Special Steel

We supply 1.2767 in the following forms (subject to stock):

  • Rounds: 8mm – 800mm diameter

  • Flats / Blocks: Thickness 20mm – 500mm, Width up to 800mm

  • Plates: Cut-to-size service available

All material is supplied in the soft annealed condition unless otherwise requested. Need pre-cutting, grinding, or heat treatment? Just ask.

Price Consideration

Is 1.2767 expensive? That depends on your benchmark. Compared to standard mold steel like P20, yes—it costs more. Compared to high-speed steel like M2, it is very competitive. Think of it as an investment in fewer tool failures and less downtime. We price per kilogram, with discounts for full mill batches. Contact us for a live quote based on your exact dimensions.

Why Choose  Otai?

Because we don’t just sell steel. We help you match the right steel to your problem. Have a tool that keeps cracking? That is a conversation worth having.

Ready to upgrade your tooling’s backbone? Get in touch today.

 

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AISI A2 / 1.2363 / X100CrMoV5/ SKD12 Air-Hardening Tool Steel

When you choose a tool steel for precision work, are you tired of materials that warp during heat treatment? Do you need a balance between wear resistance and toughness—without breaking the bank? If so, let’s talk about A2 steel.

At Dongguan Otai Special Steel, we see A2 as the “Swiss Army knife” of cold-work tool steels. It is not the absolute hardest, nor the absolute toughest. Instead, it sits right in the sweet spot. 

Below, I will walk you through everything you need to know—from chemistry to cost—so you can decide if A2 is the right fit for your next project.

What Exactly Is A2 Steel? (Standards & Equivalents)

A2 is a medium-alloy, air-hardening tool steel. The magic word here is air. Unlike oil-hardening steels (like O1), A2 hardens simply by cooling in still or circulating air. This dramatically reduces the risk of cracking or distortion.

You will find A2 under several names across the globe. Do not let the different labels confuse you—they are effectively the same material.

Standard Grade Name
AISI / ASTM (USA) A2
DIN / W-Nr (Germany) 1.2363
BS (UK) BD2
JIS (Japan) SKD12
GB (China) Cr5Mo1V 

Chemical Composition 

A2’s performance comes from a precise recipe of elements. Let me break it down like a chef explaining a signature dish:

ASTM A681 C Mn P S Si Cr V Mo
A2/T30102 0.95 1.05 0.40 1.00 0.03 0.03 0.10 0.50 4.75 5.50 0.15 0.50 0.90 1.40
DIN ISO 4957 C Mn P S Si Cr V Mo
1.2363/X100CrMoV5 0.95 1.05 0.40 0.80 0.03 0.03 0.10 0.40 4.80 5.50 0.15 0.35 0.90 1.20
JIS G4404 C Mn P S Si Cr V Mo
SKD12 0.95 1.05 0.40 0.80 0.03 0.03 0.10 0.40 4.80 5.50 0.15 0.35 0.90 1.20
BS 4659 C Mn P S Si Cr V Mo
BA2 0.95 1.05 0.30 0.70 0.035 0.035 . . . 0.40 4.75 5.25 0.15 0.40 0.90 1.10

The key takeaway: The low vanadium and moderate chromium mean A2 is much easier to grind and machine than D2, yet it resists softening far better than O1.

Mechanical Properties 

After proper heat treatment (typically 940-980°C / 1725-1800°F air quench, followed by double tempering), here is what you can expect:

Temperature 68°F 375°F 750°F
(20°C) (200°C) (400°C)
Density
lbs/in3 0.279 0.277 0.275
kg/m3 7 750 7 700 7 650
Modulus of elasticity
psi 27.5 x 106 26.9 x 106 24.6 x 106
N/mm2 190 000 185 000 170 000
Coefficient of thermal expansion
per °F from 68°F  6.5 x 10–6
per °C from 20°C 11.6 x 10–6
Properties Metric Imperial
Hardness, Rockwell C (as air-hardened (63-65 HRC average), 60-62 HRC at 205°C, 59-61 HRC at 260°C, 58-60 HRC at 315°C, 57-59 HRC at 370°C and 425°C and 480°C, 56-58 HRC at 540°C, 50-52 HRC at 595°C, 42-44 HRC at 650°C) 64 64
Bulk modulus (typical for steels) 140 GPa 20300 ksi
Machinability (based on carbon tool steel) 65% 65%
Shear modulus 78.0 GPa 11300 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 ksi

A2 round bar -OTAIA2 Steel  Applications

Because A2 is so versatile, you will find it across many industries. If your tool needs a sharp edge, withstands impact, and cannot warp during heat treatment, A2 is likely the answer.

  • Punches & Dies: Medium-volume stamping, forming, and trimming.

  • Shear Blades & Slitters: Cutting thin sheets (up to 3mm mild steel).

  • Plastic Molds: Short to medium production runs (especially with abrasive fillers like glass fiber).

  • Woodworking Knives: Planer and chipper knives.

  • Cold Forming Rolls: Where wear and compressive strength matter.

Available Sizes & Forms (What Otai Keeps in Stock)

We know that waiting for material kills your deadlines. That is why we maintain a broad inventory of genuine A2 steel, sourced from approved mills.

Form Thickness / Diameter Width / Length Surface Condition
Round Bar 20mm – 300mm Random max 5.8m Black, turned, or ground
Flat Bar / Plate 20mm – 70mm Up to 610mm width Mill surface or black surface

Need a special size? Just ask. We offer precision cutting, grinding, and even heat treatment support.

Price Considerations

How much does A2 cost? It depends on size, quantity, surface finish, and current alloy markets. However, I can give you a reliable comparison:

  • A2 vs. O1: A2 is roughly 15-25% more expensive than O1. You pay for the air-hardening benefit.

  • A2 vs. D2: A2 is typically 10-20% cheaper than D2 because it has less vanadium and chromium.

  • A2 vs. S7 (toughness grade): A2 is similar or slightly lower in cost.

Pro tip: Do not just compare price per kg. Compare cost per part produced. A2’s dimensional stability means less post-heat-treatment grinding. That alone often saves you money.

Why Buy A2 Steel from Dongguan Otai Special Steel?

We are not a middleman. We are a direct supplier with over 15 years of experience. When you email us for a quote, a real person checks stock, confirms mill certificates, and offers advice.

  • Certified chemistry: Each batch comes with a full EN 10204 3.1 test report.

  • Fast lead time: Standard sizes ship within 3-5 days.

  • Stable quality  : Stable steel source and accpet inspection from third party 

Final Thoughts: Is A2 Right for You?

Let me end with a simple question: Do you need a tool steel that hardens with minimal movement, wears longer than carbon steel, and won’t shatter on impact?

If you answered “yes,” then A2 is your material.

And if you are still unsure? That is fine too. Contact our team with your application details. We will be honest—whether that means recommending A2, D2, or another grade entirely.

Ready to get a quote or request a data sheet?

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S1 Steel: A Good Choice in Punching and Shearing Operations

Ever feel like your tools are just one impact away from a catastrophic crack? You are not alone.

In the world of stamping and shearing, brittle tools are a nightmare. They shatter, ruin your production schedule, and frankly, they cost you a fortune in downtime. That is where  S1 Steel  steps into the ring.

Think of S1 as the “Bodyguard” of the tool steel world. It doesn’t just sit there looking hard; its job is to take the punch—literally—and ask for more. At Dongguan Otai Special Steel, we see this material save our clients’ operations every day. Let me break down why this specific grade might just be the hero your workshop needs.

S1 STEEL ROUND BAR-OTAI

What Exactly is S1 Steel?

In technical terms, S1 is a Shock-Resisting Tool Steel. But let’s ditch the jargon for a second.

While other steels focus on being hard as glass (and sadly, just as breakable), S1 focuses on Toughness. It has a specific recipe of alloys designed to absorb vibration, heavy impact, and sudden loading without falling apart.

Under the hood (or the microscope), this is what the chemistry looks like according to ASTM A681 standards :

Element Percentage (%) What it does for you
Carbon (C) 0.40 – 0.55 The backbone – gives it the hardness needed to cut.
Silicon (Si) 0.15 – 1.20 The shock absorber – boosts strength and fatigue resistance.
Chromium (Cr) 1.00 – 1.80 The endurance coach – adds hardenability and wear resistance.
Tungsten (W) 1.50 – 3.00 The secret weapon – prevents softening from heat and friction.
Vanadium (V) 0.15 – 0.30 The grain refiner – keeps the microstructure tight and tough.

Equivalent steel grade for S1 steel

USA Germany China Japan France England Italy Russia Czechia Austria Sweden Spain
DIN,WNr GB JIS AFNOR BS UNI GOST CSN ONORM SS UNE
S1 45WCrV7 | 1.2542 5CrW2Si‑V L2 45WCrV8 2542
BS1
45WCRB8KU 5ХВ2СФ 19732 2710 45WCRSI8

 

The “Aha!” Moment: Where S1 Steel Beats the Others

D2 plateSo, why choose S1 over something like D2 or O1? Simple.

D2 steel  is like a ceramic plate—super hard, great for wear, but drop it and it’s in a million pieces.
S1 steel is like a rubber tire**—tough, resilient, and able to take a beating. It resists deformation and chipping at a level that high-carbon steels just can’t touch.

You get a working hardness of 56-60 HRC. That is plenty hard enough to cut metal sheeting or shape wood, but with a ductility that makes machining and heat treatment a breeze.

 Where Does S1 Steel Actually Work?

Because of this “take-a-hit” attitude, S1 is the gold standard for tools that experience sudden impact. You will find S1 steel excelling in roles where other steels fear to tread .

– Pneumatic Tools: Think chisels, rivet snaps, and breaker tool bits. These live a life of constant vibration.
– Shear Blades: For cutting scrap metal or cropping bars. The blades take a massive shock with every cut.
– Cold Forming Dies: Punches and dies that slam into metal hundreds of times a minute.
– Woodworking: Shock-resistant knives for planing hardwood knots.

 The Practical Stuff: Sizes, Prices, and Availability

At Otai, we don’t just sell certificates; we sell steel you can use. We keep a massive inventory of S1 steel (also known internationally as DIN 1.2554 or 45WCrV7) ready to ship.

Available Forms & Dimensions:

– Round Bar: Usually in the range of 16mm to 800mm diameter. Perfect for punches and rods.
– Flat Bar / Plate: Thickness from 10mm to 600mm, width up to 910mm. Ideal for shear blades and dies .

A Note on Price:

Because S1 contains Tungsten (which is a dense, high-cost alloy), it sits at a moderate price point. It is certainly more expensive than plain carbon steel, but here is the kicker: it is significantly cheaper than high-speed steels (like M2) in the long run. Why? Because the reduced risk of catastrophic failure means you save money on emergency repairs and lost production time.

S1 STEEL ROUND BAR-OTAI

 Heat Treatment Made Simple

One of the best parts about S1? It is very forgiving.

– Annealing: Heat to 750°C – 800°C (1382°F – 1472°F), cool slowly in the furnace.
– Hardening: Pre-heat to 650°C – 700°C, then raise to 900°C – 950°C (1652°F – 1742°F).
– Quenching: Oil quench is standard (or air for thinner sections).
– Tempering:Temper immediately. For that sweet spot of 56-58 HRC, hit a double temper at 400°F – 600°F .

The Bottom Line (And a Quick Ask)

Look, if you are shearing soft materials or punching delicate holes, maybe you don’t need S1. But if you are tired of hearing that “CRACK” sound when your punch hits a hard spot in the material—you need S1 steel.

At Dongguan Otai Special Steel, we specialize in providing steel that solves problems, not creates them. We can cut S1 to your exact length, grind it to your tolerance, and get it to your door before you run out of patience.

Are you currently fighting with chipping or breaking tools? Shoot us a message with your application. Let’s see if S1 is the right bodyguard for your machine.

Contact Otai Special Steel today. Let’s get your tools working harder and smarter.

 

Joann
Name: Joann

 

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A8 Modified/1.2360 vs. D2 Steel – Which One Saves Your Tooling?

Choosing the wrong tool steel leads to early failure. Two grades we often compare are  A8 Modified/1.2360  and  D2. Both are air-hardening, but they solve different problems. A8 modified chipper steel equivalent 1.2360.

Composition Difference between A8 Modified/1.2360 and D2

C Si Mn S P  Cr Mo  Ni  V
D2 1.40-1.60 0.10-0.60 0.10-0.60 Max0.030 Max0.030 11.00-13.00 0.70-1.20 / 0.50-1.10
A8 modified/ 1.2360 0.45-0.50 0.70-0.90 0.35-0.45 Max0.005 Max0.020 7.30-7.80 1.30-1.50 / 1.30-1.50

– D2 : High carbon (1.4–1.6%) and high chromium (11–13%). This creates hard carbides for excellent wear resistance.
– A8 Modified/1.2360: Medium carbon (0.45–0.50%) and medium chromium (7.3–7.8%). It adds molybdenum, vanadium for superior toughness.

D2 platePerformance: Wear Resistance vs. Toughness

This is the key trade-off.

– D2: Offers high wear and abrasion resistance . It holds a sharp edge for long production runs. However, it is brittle and prone to chipping or cracking under impact.
-A8 Modified /1.2360: Offers excellent impact toughness. It resists shock, bending, and breaking. The trade-off? Lower wear resistance than D2.

 Application Range

Choose D2 when failure is from wear:

– Long-run blanking dies
– Forming rolls
– Slitter and shear blades
– Thread rolling dies

Choose A8 Modified /1.2360 when failure is from chipping or breaking:

– Cold heading punches
– Cold forging dies
– Heavy-duty stamping punches
– Chipper knives (wood/paper)
– Punches that see impact loads

Price Comparison

– D2: More affordable. It is a standard, high-volume grade with competitive pricing.
– A8 Modified/1.2360: Higher cost per kg due to its specialized alloy design and lower production volume.

But remember: If your D2 tools keep cracking, the downtime and replacement cost far exceed the material price difference. A8 Modified /1.2360 often gives a lower total cost per part.A8 MODIFIED/1.2360 flat bar

 Summary Table

Feature D2 A8 Modified
Wear Resistance High Medium
Toughness Low-Medium High
Typical Hardness (HRC) 58–62 56–60
Price Lower Higher
Failure Mode Solved Abrasion Impact / Cracking

D2 narrow flat bar

Our Recommendation for Export Customers

– Wear life is your problem → Choose D2
– Cracking or breaking is your problem → Choose A8 Modified/1.2360

We stock both grades in rounds, flats, and plates. Not sure which one fits your application? Send us your tool drawing and failure photos. We will recommend the right steel for your real shop-floor conditions.

Contact us today for a quote on D2 or A8 Modified/1.2360 steel.

 

Joann
Name: Joann

 

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What is Powder metallurgy high-speed steel (PMHSS) ?- TPM330, ASP23,M3:2

Before understanding powder high-speed steel, we first understand what powder metallurgy is. Powder metallurgy refers to a steel manufacturing process in which fine steel powder is obtained by atomizing molten steel with high-pressure inert gas or high-pressure water, then pressed into shape under high temperature and high pressure, and then sintered. Powder metallurgy high-speed steel also call PMHSS which  is high-speed steel manufactured through powder metallurgy process.

Manufacturing process of Powder metallurgy high speed(PMHSS)

    1. Atomized high-speed steel: First, pour the high-speed steel into high-pressure inert gas or high-pressure water to atomize it into fine high-speed steel powder.PMHSS process-Powder process
    2. Press molding:Put the high-speed steel powder obtained after atomization into a mold and press it into shape under high temperature and high pressure.
    3. Sintering: Put the pressed blank into a sintering furnace and perform sintering treatment to make it completely densified.
    4. Heat treatment: Finally, the sintered blank make heat treatment to adjust its structure and properties.powder metallurgy high speed steel process

The difference between Powder metallurgy high speed(PMHSS)and traditional HSS

Wear resistance

Since the particles (powder) of PMHSS are small and uniform, there will be no uneven solidification, and the internal structure is uniform and stable. Therefore, under the same heat treatment and quenching temperature, the wear resistance of PMHSS will be better than  ordinary HSS.

Purity

Before PMHSS is prepared and formed, its raw materials (powder) will be strictly filtered and screened. This will completely remove impurities and non-metallic substances from the raw material. At the same time, the composition of PMHSS is stabilized after molding to ensure product quality.

No directionality

Powder metallurgy high-speed steel(PMHSS) is made of extremely small particles (powder) that are pressed and sintered, so the performance and strength of all parts of the entire product will be the same. There will be no horizontal or vertical organizational structure like ordinary high-speed steel. Therefore, the overall performance of the entire product also be higher.

Regular deformation

Although powdered high-speed steel has a special structure, dimensional deformation will also occur during the heat treatment process. However, compared with the irregular deformation of ordinary high-speed steel, PMHSS will cause regular deformation of the entire product. In other words, during the heat treatment process of grinding high-speed steel, all parts will become larger at the same time.

Difference in price

The production process of powder metallurgy high-speed steel is complex and the cost is high.

PMHSS is generally 4 to 8 times more expensive than ordinary high-speed steel, so it is usually used to manufacture precision and complex tools or tools for CNC machine tools.

However, the performance of cutting tools made of PMHSS is better than that of ordinary HSS, and the service life is longer than that of ordinary HSS (generally 2 to 3 times).

Application of Powder metallurgy high speed (PMHSS)

  • Powder metallurgy high speed steel has good mechanical properties. Suitable for manufacturing: tools that are prone to chipping under intermittent cutting conditions, tools with high strength and sharp cutting edges. Such as gear shaper cutters, hobs, milling cutters, and tools used under high-pressure dynamic loads.
  • It has small carbide segregation, fine grains and good wear resistance. Suitable for manufacturing: large-size knives, precision knives, complex knives.
  • This type of material has high thermal hardness at high temperatures and is suitable for making tools for difficult-to-machine materials. It is indeed comprehensive.PMHSS application

The development of Powder metallurgy high speed in China

Although China is a major producer of high-speed steel cutting tools, with output and export volume ranking first in the world, China’s high-speed steel industry is still limited by technical barriers and other factors. Currently, the high-end high-speed steel market is still monopolized by overseas brands. At present, most of the powdered metallurgy high-speed steel (PMHSS) is still imported into China.

Due to the high price, many users cannot afford the high cost. In recent years, China has also begun to develop Chinese powder high-speed steel, such as TG’s TPM330. The following is a comparison of the chemical composition of TPM330 with ASP23 and M3-2

C  Cr Mo  V W Si Mn S P
M3-2 1.15-1.25 3.75-4.50 4.75-6.50 2.75-3.25 5.00-6.75 0.20-0.45 0.15-0.40 Max 0.030 Max 0.030
ASP23 1.28 4.20 5.00 3.10 6.40
TPM330 1.28 4.10 5.00 3.00 6.40

Although China’s TPM330 cannot completely replace ASP23 at present, it is undoubtedly the most cost-effective choice. Under the use conditions of some punch materials, the national standard TPM330 also has a longer service life and better performance than ordinary ones such as M2, M42, and DC53. However, for IC packaging molds and complex-shaped workpieces, you can only choose ASP23 because the purity cannot reach  TG. TG is the third generation of powder metallurgy, and ASP is the fifth generation.

 

In conclusion

The special and advanced smelting method of PMHSS is an innovation in high-speed steel smelting, which creates a new steel type with properties between cemented carbide and ordinary HSS. The rise of PMHSS has brought new breakthroughs in tool materials for the machinery manufacturing and processing industry. As a new steel type with excellent performance, it has gradually been recognized, accepted and loved by people, and is playing an increasingly important role in the machinery industry.

In short, PMHSS is a very excellent high-performance steel with fine grain structure, high wear resistance, high toughness and other characteristics. And is suitable for high-precision and high-efficiency processing applications.

It can be used not only to manufacture various types of tools and cutters, but also to manufacture high-quality mechanical parts and bearings, etc. In the future, with the continuous development of powder metallurgy technology, it is believed that the application scope of  PMHSS will be further expanded.

Currently , Otai stock PMHSS  TPM330 flat bar size

150*200/ 150*300 /200*200 /200*300

If you want to know more about the PMHSS information and the TPM330 stock , please contact

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Detail Guide of Cr12MoV steel and its application

Cr12MoV steel is a kind of high carbon and high chromium steel, it is belong to GB/T 1999-2000.  Typical steel types such as Cr12, Cr12MoV, Cr12Mo1V1, D2, SKD11,X12MF etc. Cr12MoV have a carbon content of over 1.40% and a chromium content of 11.00%~13.00% and has excellent properties such as hardenability, hardness and flexural strength. It is an important material for manufacturing stamping dies, cold forming dies and other molds. It is widely used in various curved parts and molds with large cross-sections and complex shapes.

Chemical Compostion and it’s equivalent Grade:

Steel Country Code C(%) V(%) Si(%) Mn(%) P(%) S(%) Cr(%)
D2 ASTM 1.40-1.60 0.50-1.10 0.10-0.60 0.10-0.60 ≦0.030 ≦0.030 11.0-13.0
Cr12MoV GB 1.45-1.70 0.15-0.30 ≦0.40 ≦0.40 ≦0.030 ≦0.030 11.0-12.5
SKD11 JIS 1.40-1.60 0.20-0.50 ≦0.40 ≦0.60 ≦0.030 ≦0.030 11.0-13.0
X165Cr-MoV12 DIN 1.55-1.75 0.10-0.50 0.25-0.40 0.2-0.4 ≦0.030 ≦0.030 11.0-12.0

CR12MOV steel has improved the hardenability and hardenability of the steel due to the addition of appropriate amounts of chromium, molybdenum, vanadium and other alloying elements, making the material’s comprehensive mechanical properties after quenching much higher than other types of steel, and is widely used in the manufacture of molds.

Cr12MoV Steel Heat Treatment

Cr12MoV forged steel round bar-OtaiAnnealing

800 to 850°C
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. Hardness after annealing: max. 250 HB.

Stress relieving

650 to 700°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1-2 hours.

Hardening

980 to 1010°C
Oil, salt bath (220 to 250°C or 500 to 550°C), air blast, still air. Tools of intricate shape or with sharp edges should preferably be hardened in air or salt bath. Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 63 – 65 HRC

Tempering

Slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20 mm of workpiece thickness but at least 2 hours/cooling in air.
For certain cases we recommend to reduce tempering temperature and increase holding time

Cr12MoV Steel Delivery Condition:

Annealed , 207-255HB

Cr12MoV Steel Application:

Cold work dies

  1. Cr12MoV steel is widely used in the manufacture of cold work dies with large cross-sections, complex shapes, large impact forces, and high wear resistance requirements, such as silicon steel sheet punching dies, cold cutting scissors, trimming dies, thread rolling dies, wire drawing dies, rolling dies, etc. Wire plate, thread rolling die, complex-shaped punching die, steel plate drawing die, etc.
  2. The service life of the rolls used to replace Cr2 steel in manufacturing rolled and welded steel pipes is increased by more than 7 times.

Extrusion punches

  1.  For pure aluminum blank reverse extrusion punches made of this steel, when the pressure is about 1000MPa, the life of the punch is guaranteed to be more than 50,000 pieces. The main failure modes are wear and surface roughening.
  2.  Used to manufacture punching dies with material thickness >3mm, punch dies, concave dies, and inserts with complex shapes. The recommended hardness is 58-62HRC when making punch molds, and the recommended hardness is 60-64HRC when making concave molds.Cr12MoV round bar-Otai
  3.  Used to make punches and concave dies that require high wear resistance in punching dies. When making punches, the recommended hardness is 60-62HRC, and when making concave dies, the recommended hardness is 62-64HRC.
  4.  Used to manufacture concave dies that require high wear resistance in drawing dies. The recommended hardness is 62-64HRC.
  5. Used to manufacture punches, concave dies, and inserts that require high hardness and complex shapes in bending dies. The recommended hardness is 60-62HRC when making punches, and 60-64HRC when making concave dies.
  6.  Used to make cold extrusion dies for aluminum parts. The recommended hardness for making punch molds is 60-62HRC, and for making concave molds, the recommended hardness is 62-64HRC.
  7. Used to manufacture cold extrusion concave and convex molds for copper parts. The recommended hardness is 62-64HRC.

Bend spring steel plates

  1.  Used to bend spring steel plates with a carbon content of 0.65%-0.80% (mass fraction), a hardness of 37-42HRC, and a service life of up to 150,000 times. If nitriding treatment carry out, the service life can reach 400,000 times.
  2. When used to manufacture thread rolling dies for processing 20Mn steel, after repeated upsetting and elongation, the carbide unevenness of the blank is ≤3, then the service life of the thread rolling dies will be increased from the original 20,000 pieces to 500,000 pieces.

Plastic molds

  1.  Used for manufacturing thermosetting plastic forming molds and general plastic molds.
  2. Cr12MoV steel stainless steel mold vacuum quenching + gas nitriding. At present, most domestic stainless steel molds are made of Cr12MoV steel.

Want to know  more about the Cr12MoV steel details  ?

Pls contact : JoannJoann -Otai specai steel

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Cold work steel DIN 1.2080 (X210Cr12)/D3/SKD1

DIN 1.2080 also know as X210Cr12 steel ,it  belongs to  standard DIN EN ISO 4957. It is a widely used cold work steel with high strength, good hardenability and good wear resistance. It mainly used for cold punching dies and punches, cold cutting scissors, drill sleeves, gauges, wire drawing dies, stamping dies, thread rolling dies, drawing dies and thread rolling dies that bear small impact loads and require high wear resistance.

DIN 1.2080 Introduction

DIN 1.2080 steel is a high-carbon, high-chromium ledeburite steel . This steel has good hardenability, wear resistance, and hot workability. However , the composition don’t add VCarbides are well distributed in the steel and can be used for manufacturing Various cold work dies with complex shapes and heavy working conditions. Such as cold die punches, thread rolling dies, wire drawing dies, material dies, metallurgical powder dies, woodworking cutting tools, cold cutting scissors, drill sleeves and gauges.

DIN 1.2080 Steel and its Equivalent Chemical composition  :(%)

ASTM A681 C Mn P S Si Cr V T Mo
D3 2.00 2.35 0.10 0.60 Max 0.030 Max 0.030 0.10 0.60 11.00 13.50 . . . 1.10 . . . 1.00 . . . . . .
DIN ISO 4957 C Mn P S Si Cr V T Mo Ni
1.2080/X210Cr12 1.90 2.20 0.20 0.60 Max 0.030 Max 0.030 0.10 0.60 11.00 13.00
JIS G4404 C Mn P S Si Cr V T Mo Ni
SKD1 1.90 2.20 0.20 0.60 Max 0.030 Max 0.030 0.10 0.60 11.00 13.00

Characteristic:

1. Vacuum degassing and refining treatment make the steel pure.

2. Spheroidizing annealing and softening treatment, good cutting performance.

3. The strengthening element vanadium and molybdenum are specially added to provide extremely excellent wear resistance.

1.2080-steel-flat-barApplication:

1. Thickness no more than 2MM thin plate, high-efficiency blanking die, punching die and stamping die.

2. Various scissors, inlaid blades, woodworking blades.

3. Thread rolling die and wear-resistant slider.

4. Cold heading mold, thermosetting resin molding mold.

5. Stretch forming mold and cold extrusion mold.

Mechanical Properties:

Mechanical Properties Metric Imperial
Izod impact unnotched 28.0 J 20.7 ft-lb
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 ksi

Physical Properties:

Physical Properties Metric Imperial
Density 7.7 x 1000 kg/m3 0.278 lb/in3
Melting Point 1421°C 2590°F

DIN 1.2080 Steel Heat treatment :

Temperature Cooling Hardness
Soft annealing 800 – 840 °C Furnace Max 255 HB
Stress relief annealing 600 – 650°C Furnace  
Hardening 950 – 980°C oil, pressure gas (N2), air or hot bath 500 – 550°C see tempering diagram

1.2080 Hardness -tempering temperature -curves 1.2080-STEEL-ROUND-BAR-TURNED

Delivery status:

The steel is delivered in an annealed state.

Conclusion:

DIN 1.2080 mold steel is also one of the internationally used cold work mold steels, but has recently been gradually replaced by better steel types such as Cr12MoV, Cr12Mo1V1 or matrix steel. It is mainly used for cold stamping die working parts that require high wear resistance and small impact load (punch and concave dies), cold extrusion die concave dies, etc. Although its use is subject to certain restrictions due to its obvious advantages and disadvantages, it is still used in some specific areas are still irreplaceable.

Want to know  more about the DIN 1.2080 ( X210Cr12 ) /D3/SKD1 steel details  ?

Pls contact : JoannJoann -Otai specai steel

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Discovery Cold Work Tool Steel DIN 1.2436(X210CrW12)/AISI D6/ JIS SKD2

DIN 1.2436 is German DIN standard extra high toughness chromium steel and cold work mould steel. Has extremely high wear resistance and edge retention capabilities. It is a widely used cold work die steel with high strength, good hardenability and good wear resistance, but the weak point is it  poor impact toughness. 1.2436 adds 0.6%-0.8% tungsten compare with 1.2080, so its wear resistance is better than 1.2080 steel. However, compared with 1.2379, because a certain amount of vanadium is added to 1.2379 steel , it toughness performace better than 1.2436. Therefore, 1.2436 s mainly used for cold stamping dies and punches, cold cutting shears, drill bushings, and gauges that bear smaller impact loads and require high wear resistance , drawing dies, impression dies, thread rolling dies, drawing dies and thread rolling dies, etc.

Standard:

DIN 1.2436  belong to German Industrial Standard (DIN) DIN EN ISO 4957 .

 Chemical Composition and Equivalent Steel:

DIN ISO 4957 C Mn P S Si Cr W
1.2436 / X210CrW12 2.00 2.30 0.30 0.60 0.03 0.03 0.10 0.40 11.00 13.00 0.60 0.80
JIS G4404 C Mn P S Si Cr W
SKD2 2.00 2.30 0.30 0.60 0.03 0.03 0.10 0.60 11.00 13.00 0.60 0.80
ASTM A681 C Mn P S Si Cr W
D6 2.00 2.20 0.20 0.40 0.03 0.03 0.20 0.40 11.50 12.50 0.60 0.90

 

1.2436 flat barDIN 1.2436 Physical Properties:

1. Density:  7.80 g/cm³.
2. Melting Point: A scorching 1426°C (2599°F).
3. Thermal Conductivity: Playing it cool with 24 W/(m·K).
4. Specific Heat: Holding its heat with 0.46 J/g·K.
5. Electrical Resistivity: A light touch at 0.40 µΩ·m.
6. Coefficient of Thermal Expansion: A modest 10.5 x 10^-6/°C (20-100°C).

DIN 1.2436 Mechanical  Properties:

1. Hardness (Annealed):  Max 255 HB (Brinell Hardness).
2. Tensile Strength: A robust 700-800 MPa.
3. Yield Strength: A sturdy 600 MPa.
4. Elongation at Break: A flexible 14%.
5. Reduction in Area: A resilient 45%.
6. Modulus of Elasticity: A firm handshake at 210 GPa.

Applications:

1. Crafting Cold Work Tools: DIN 1.2436 steel takes the lead in creating the backbone of cold work tools—forming dies, blanking, and shearing tools.
2. Mastering Precision Machining:Its rock-hard nature and resistance to wear make it the maestro in precision and accuracy-demanding applications.
3. Tooling the Cutting Edge: Employed in the crafting of cutting tools for diverse materials, thanks to its durability.
4. Stamping and Embossing Star: Industries with an eye for tight tolerances revel in the precision offered by this tool steel.
5. Blades of Industry: Takes center stage in the fabrication of industrial blades for various cutting applications.

Heat Treatment :

Temperature

Cooling

Hardness

Soft annealing

800 – 840 °C

Furnace

250 HB

Stress Relief Annealing

600 – 650°C

Furnace

Hardening

960 – 980°C

oil, pressure gas (N2), air or hot bath 500 – 550°C

See Tempering Diagram

1.2436 round barFAQs about  1.2436 Steel

Q1: What industries commonly use DIN 1.2436?

DIN 1.2436 finds its rhythm in industries such as cold Work Tools ,cutting and drill, thanks to its versatile properties.

Q2: Can DIN 1.2436 heat things up in high-temperature applications?

While DIN 1.2436 dances elegantly in cold work applications, it might not be the star performer in high-temperature scenarios. 1.2379 steel  properties might take the spotlight.

Q3: How does the heat treatment effect the DIN 1.2436’s performance?

The heat treatment ballet elevates the hardness and toughness of DIN 1.2436, letting manufacturers choreograph its properties based on specific application needs.

Q4: Is DIN 1.2436 a cost-effective partner in the long run?

Absolutely! The lasting power and wear resistance of tools born from DIN 1.2436 contribute to a cost-effective symphony over time, reducing the need for constant replacements.

Want to know  more about the D6/1.2436 ( X210CrW12 ) /SKD2 steel details  ?

Pls contact : JoannJoann -Otai specai steel

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Exploring 1.2316 (X38CrMo16) Steel: A Comprehensive Overview

1.2316 (X38CrMo16)  steel is a prehardened mold steel recognized for its superior corrosion resistance, achieved through the addition of chromium and molybdenum. It  widely apply in mold applications, including cores, inserts, and mold cavities, this steel  also use for the production of corrosive materials like PVC.

Standard:

DIN 1.2316 steel belongs  to the DIN standard EN ISO 4957 :2018

1.2316 steel round bar-OTAI 1.2316 Steel  Equivalent  and Chemical Composition

Standard Steel Grade
Chemical composition %
C: Mn: Si: P: S: Cr: Mo: Ni:
EN 10088-3:2014 X39CrMo17-1 – 1.4122
0.33 – 0.45 <1.5 <1.0 <0.04 <0.03 15.5 – 17.5 0.8 – 1.3 <1.0
ISO 4957:2018 X38CrMo16 – 1.2316
0.33 – 0.45 <1.5 <1.0 <0.03 <0.03 15.5 – 17.5 0.8 – 1.3 <1.0
DIN 17350:1980 X36CrMo17 – 1.2316
0.33 – 0.43 <1.0 <1.0 <0.03 <0.030 15.0 – 17.0 1.0 – 1.3 <1.0
NF A35-590 Z38CD16-01
0.33 – 0.45 <1.0 <1.0 <0.04 <0.015 15.5 – 17.5 0.8 – 1.3
NF Z35CD17
0.33 – 0.45 <1.5 <1.0 <0.03 <0.03 15.5 – 17.5 0.8 – 1.3 <1.0
PN 3H17M
0.33 – 0.43 <1.0 <1.0 <0.045 <0.030 15.5 – 17.5 1.0 – 1.3 <1.0

 

1.2316 Steel Physical Properties:

Thermal conductivity W.m-1.K-1 Thermal expansion Coefficient (10-6.K-1)
20°C 20-100°C 20-200°C 20-300°C 20-400°C Specificheat J/kg.°C
24.3 11 11.1 11.4 11.7 460

 

1.2316 Steel Mechanical Properties:

1.2316 delivery condition  usually  quenched and tempered to 280 – 325 HB (29 – 33 HRC)

Hardness  Rp 0.2  Yield
Strength
Rm Tensile
strength
 Elongation  Reduction of area  Elastic modulus
HB MPa ksi MPa ksi % Z% GPa ksi
300 855 124 1020 148 13 38 205 29733

DIN 1.2316(X38CrMo16) steeel Heat treatment:

1.2316 steel Hardness -tempering temperature curves-OTAI1.2316 steel l is normally supplied in the quenched and tempered condition with a hardness of approximately 300 HB.

  • Annealing: 760 to 800 °C for about 4 to 5 hours; slow controlled cooling of 10 to 20 °C per hour to about 650 °C; further cooling in air, max. 230 HB
  • Stress Relieving: Soaking is done at temperature 600 – 650°C and then it is furnace cooled. This process is done at approx. 650 °C.
  • Hardening: Heat to 1020 – 1040 °C. Quench in oil at 500 – 550°C. Hardness after quenching: 48 – 52 HRC
  • Tempering: The hardness varies depending on the tempering temperature, ranging from 32 HRC to 49 HRC.

In case of complicated parts, holding time should be determined considering the thicker section of the part.

1.2316 Steel Applications:

-Suitable for manufacturing PVC, POM and other plastic products, or other corrosive plastics and high-gloss plastic molds;

-Thermoplastic plastic injection molds, extrusion molds;

-Thermoplastic blow molds;

-Main components of heavy-duty mold;

-Cold structural parts;

-It often use in the manufacture of TV casings, washing machines, refrigerator inner casings, buckets, etc.

Quality Assurance and Certification:

– Ensuring that the steel aligns with industry standards is crucial. Verify relevant certifications, such as DIN EN ISO 9001 for quality management systems.

Considerations for Buyers:

– Stress the importance of understanding the application’s specific requirements to choose the most suitable steel grade.
– Provide MTCs to check the chemical compositions and propertities if it is meet the material requirement

Conclusion:

1.2316 steel is a versatile mold steel offering prehardened convenience, excellent corrosion resistance, and adaptability to humid environments. Thanks to its mechanical and physical properties and coupled with straightforward heat treatment, make it a preferred choice for various applications in the mold industry.

Want to know more about the details of 1.2316, stock list and price , pls contact :

Joann -Otai specai steelE-mail:joann@otaisteel.com

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