Steel OCR12VM (Mat.No. 1.2379, DIN X155CrVMo12-1, AISI D2)

Designation by Standards

Chemical Composition (in weight %)

Description
This alloy is one of the cold work, high carbon, high chromium type tool steels. D2 is a deep hardening, highly wear resistant alloy. It hardens upon air cooling so as to have minimum distortion after heat treatment.

Applications
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. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 210 
Density [g/cm³]: 7.70
Thermal conductivity [W/m.K]: 20.0 
Electric resistivity [Ohm mm²/m]: 0.65
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10^-6oC^-1

Soft Annealing
Heat to 840-880^oC, cool slowly. This will produce a maximum Brinell hardness of 255. To secure uniform softness.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650-700^oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Harden from a temperature of 1000-1040^oC followed by oil, warm bath (500-550^oC, cooling bath or air. Hardness after quenching is 62-64 HRC.

Tempering
Tempering temperature: 150-550^oC.

Tempering Temperature (^oC) vs. Hardness (HRC)

Forging
Hot forming temperature: 1050-850^oC. 

Machinability
Machinability of D2 is poor. Using the water hardening simple alloy tool steels (W group) as a base of 100 % the D2 alloy would rate about 50 % in machinability.

Corrosion Resistance
D2 is a steel alloy and is not corrosion resistant. It will rust unless protected.

Cold working
Cold working by conventional methods may be done with the alloy in the annealed condition.

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties.

1.All the round bar and flat bars are fixed by the steel wire in the container .

2.On the bottom of container , we also put the wooden dunnage between the material and container bottom

3.As customer requirements. 

 1.Machining Service