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