1.2379 | D2
High carbon and high chromium, ledeburitic 12% Cr alloyed cold work tool steel, excellent abrasion resistance, carbides in the microstructure, high cutting ability with edge holding properties, high compression strength, excellent toughness properties, dimensional stability during heat treatment, high resistance to softening at elevated temperatures and electrical discharge machining.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison(wt%)
| W-Nr | EN | AISI | JIS |
| 1.2379 | X155CrVMo12-1 | D2 | – |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo | V |
| 1.45~1.60 | 0.10~0.60 | 0.20~0.60 | ≤0.03 | ≤0.03 | 11.0~13.0 | 0.70~1.00 | 0.70~1.00 |
Physical Properties
Density（g/cm3)：7.70
Modulus of Elasticity（Gpa): 210
Thermal Conductivity（W/（m.k)): 20.0
| Temperature/℃ | 20-100 | 2-200 | 2-300 | 2-400 |
| Coefficient of Thermal Expansion（×10-6） | 9.8 | 11.7 | 12.1 | 12.8 |
Heat Treatment Process
Hardening: Heat the steel evenly to 1000~1050°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 840~880°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Heat the steel uniformly, hold it at the selected tempering temperature, and then allow it to cool in still air.
| Tempering Temperature (℃) | 180 | 480 | 550 | 600 |
| Hardness (HRC) | 59~91 | 49~51 | 44~46 | 39~41 |
Application Fields
Used for long run tooling applications where wear resistance is important, such as blanking or forming dies and thread rolling dies, cutting tools, stamping, woodworking, moulding tools for plastics. Toughness better than in D3. Possibility of nitriding.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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