1.2379 | D2 | SKD11 | Х12MФ
1.2379 is a tool steel with a carbon content of 1.5%, a chromium content of 11.5%, and a hardness of up to 60HRC after heat treatment. It is a kind of semi-stainless steel. D2 steel has good wear resistance and moderate toughness. The disadvantage is that the corrosion resistance is slightly insufficient. It is a kind of steel that is more suitable for practical use. Bob Dozier likes to use D-2. D2 steel is highly wear-resistant, slightly deformed cold work die steel, wind-hardened tool steel. D2 steel can be used to manufacture cold work die steels with large cross-sections, complex shapes, high impact resistance, and high wear resistance, such as silicon steel sheet die, cold cutting scissors, trimming die, etc.
Description
Chemical Composition
| Standard | Grade | C | Si | Mn | Cr | P | S | Mo | V |
| ASTM | D2 | 1.40-1.60 | 0.10-0.60 | 0.20-0.60 | 11.00-13.00 | ≤0.03 | ≤0.03 | 0.70-1.20 | 0.50-1.10 |
| DIN | 1.2379 | 1.50-1.60 | 0.10-0.60 | 0.15-0.60 | 11.00-12.00 | ≤0.03 | ≤0.03 | 0.70-0.80 | 0.70-1.10 |
| JIS | SKD11 | 1.40-1.60 | ≤0.40 | ≤0.60 | 11.00-13.00 | ≤0.03 | ≤0.03 | 0.80-1.20 | 0.20-0.50 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements
Heat Treatment
Soft annealing
The material 1.2379 can be annealed at temperatures of 830°C - 850°C. Subsequently, a slow cooling in the oven must be done.
Stress relief annealing
Stress relief annealing is carried out at 650°C - 700°C with subsequent cooling of the furnace.
Hardening
Hardening takes place at 1010°C - 1030°C with a final cooling in oil, warm bath, air or vacuum.
Tempering
Tempering takes place at 170°C - 190°C.
Applications
The field of application is in drawing and bending tools, plastic molds in the processing of abrasive polymers, machine knives, cold shear knives, cold extrusion tools, thread rolling dies, thread rolling rolls, thermoforming tools, cutting and punching tools and milling cutters. As a high-performance cutting steel, it can also be use in high-performance cutting tools such as dies and punches.
