16MnCr5 steel is an alloy steel which has good hardenability and machinability. For larger cross-section parts, it can achieve high surface hardness and wear resistance after heat treatment, and also has high low-temperature impact toughness. 16MnCr5 gear steel, after carburizing and quenching, is mainly used to manufacture gears, worm gears, and sealing bushings.
What Exactly Is 16MnCr5 steel?
Think of 16MnCr5 like a peanut M&M.
The inside is soft, tough, and chewy – that’s your core toughness. The outside is hard, crunchy, and takes all the abuse – that’s your wear-resistant surface.
That’s exactly what case-hardening does. You get a component that’s hard on the outside (to resist friction and wear) but still tough on the inside (to absorb shocks and impacts without snapping).
16MnCr5 is a low-alloy case-hardening steel that follows the DIN EN 10084 standard. It’s used everywhere – automotive, heavy machinery, precision engineering, you name it.
16MnCr5 steel Chemical Composition
| Element | Content (%) | What It Does |
|---|---|---|
| Carbon (C) | 0.14 – 0.19 | Low enough for tough core |
| Manganese (Mn) | 1.00 – 1.30 | Boosts strength and hardenability |
| Chromium (Cr) | 0.80 – 1.10 | Creates the hard surface after carburizing |
| Silicon (Si) | ≤ 0.40 | Deoxidizer, keeps it clean |
| Phosphorus (P) | ≤ 0.025 | Kept low for toughness |
| Sulfur (S) | ≤ 0.035 | Kept low for machinability |
See that manganese and chromium together? That’s the magic combo. Manganese gives you a strong, ductile core. Chromium gives you that beautiful hard shell
after heat treatment.
Where Does 16MnCr5 Come From? (Standards & Equivalents)
Nobody likes hunting down equivalent grades. So here’s your cheat sheet:
| Standard | Country | Equivalent Grade |
|---|---|---|
| DIN/EN (Germany) | Europe | 16MnCr5/1.7131 |
| AISI/SAE (USA) | United States | 5115 |
| JIS (Japan) | Japan | SMnC420 |
| BS (UK) | United Kingdom | 655M13 |
| GB (China) | China | 20CrMn |
| UNI (Italy) | Italy | 16MnCr5 |
A quick warning: AISI 5115 is close but not chemically identical. Always double-check your specs before swapping.
How Does 16MnCr5 steel Perform?
Let me give you the headline numbers. These are for soft-annealed condition (as you’d receive it from us) and after quenching + tempering.
| Property | Soft Annealed | Quenched + Tempered |
|---|---|---|
| Tensile Strength | 500 – 700 MPa | 800 – 1,100 MPa |
| Yield Strength | 300 – 450 MPa | 550 – 850 MPa |
| Elongation (how much it bends before breaking) | 18 – 22% | 10 – 14% |
| Surface hardness (after carburizing) | N/A | 58 – 62 HRC |
| Core hardness (after carburizing) | N/A | 30 – 45 HRC |
Here’s what those numbers mean in real life. The core stays tough and ductile – so your gear tooth won’t snap off under shock loading. The surface gets incredibly hard – so it won’t wear out after a million cycles.
Fatigue strength for 16MnCr steel? About 450 – 550 MPa in rotating bending. That’s roughly 30-40% better than plain carbon steel like 1045. That’s the difference between a gearbox that lasts 500 hours and one that lasts 5,000 hours.
Application for 16MnCr5 steel
Honestly? Anything that needs to survive friction without snapping in half.
– Gears (especially transmission gears – this is the classic application)
– Camshafts and cam followers
– Piston pins
– Bushings and sleeves
– Spindles and shafts
– Hydraulic components
– Chain pinions
– Worm gears
Ever wonder why some machine parts last 10 years and others last 10 months? Often, it’s the steel choice. **16MnCr5 is the “10-year” option.**
Heat Treatment – The Secret Sauce
Raw steel is only half the story. Heat treatment is where 16MnCr5 comes alive.
Here’s the typical process:
- Carburizing– Add carbon to the surface at high temperature (around 880-980°C)
- Hardening – Quench in oil to lock in that hard surface
- Tempering – Relieve internal stress at 150-200°C
After this process, you get:
– Surface hardness: 58 – 62 HRC
– Case depth: 0.5 – 1.8 mm (adjustable by time and temperature)
– Core hardness: 30 – 45 HRC (still tough and ductile)
Think of it like a lollipop. Hard candy shell. Soft chewy center. The surface takes the scratches. The core takes the load. Beautiful partnership.
How Does 16MnCr5 steel Compare to Other Grades?
You’re probably wondering – why not just use 8620? Or 20MnCr5? Or plain 1045?
| Grade | Toughness | Wear Resistance | Best For |
|---|---|---|---|
| 16MnCr5 | Very Good | Good | Balanced performance |
| 20MnCr5 | Good | Better | Heavier gears, higher loads |
| 8620 | Excellent | Fair | Maximum core toughness |
| 1045 | Fair | Poor | Low-cost, non-critical parts |
My honest take: If you need maximum core toughness, buy 8620 – but you’ll pay more. If you need maximum surface hardness, buy 20MnCr5 – again, more expensive. But if you want the sweet spot – good wear resistance, good toughness, and a reasonable price – 16MnCr5 is your answer.
Sizes We Stock
Nobody wants to hear “we can get it in six months.” At Otai Special Steel, we keep real inventory on the floor.
| Form | Size Range |
|---|---|
| Round Bar | 6mm – 800mm diameter |
| Flat Bar | 10mm – 200mm thickness |
| Plate / Sheet | 8mm – 150mm thickness |
| Block | Custom cut to order |
And yes – we cut to your exact lengths. You don’t have to buy a six-meter bar when you only need 400mm. That’s just common sense.
What About Price of 16MnCr5 Steel?
Everyone wants to know, but nobody wants to ask. So I’ll tell you straight.
16MnCr5 steel sits in the mid-range price bracket. It’s more expensive than plain carbon steel (like 1045 or 1020), but significantly cheaper than high-alloy tool steels (like H13, D2, or 8620).
Why? Because it’s a balanced alloy. Not too much chromium. No expensive nickel or molybdenum. You get 80% of the performance of fancier grades at maybe half the cost.
That’s not marketing – that’s just smart engineering.
Want a specific price per kilogram or per ton for your size and quantity? Just email us. We reply fast – usually within a few hours.
Why Buy From Dongguan Otai Special Steel?
I could give you a long, polished marketing speech. But here’s the short, honest version:
– We’re specialists – steel is all we do. Not bearings. Not fasteners. Just high-quality special steel.
– Real inventory – not just a “supplier network” that dropships from someone else.
– Cut-to-size service – fast lead times, no minimum order headaches.
-We speak engineering – not just sales. Ask us a technical question. You’ll get a real answer.
– Full traceability– mill certificates included with every order.
We’re based in Dongguan, but we ship worldwide. Europe, North America, Southeast Asia, the Middle East – we’ve done it all.
One Last Thought Before You Go
If you’re designing a gear, a shaft, a pin, or any component that needs a hard surface and a tough core – don’t overcomplicate it.
You don’t always need special, expensive alloys. Sometimes, the smartest choice is a classic. And 16MnCr5 steel is about as classic as it gets.
So here’s my question to you: What are you building next?
And if 16MnCr5 steel sounds like the right fit – or even if you’re not sure – just reach out. I’d rather help you choose the right steel than sell you the wrong one. That’s not just good business. That’s just being honest.
Dongguan Otai Special Steel
Your steel partner, not just a supplier
