Designation by Standards
| Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| OCR12 |
834 |
1.2379 |
X155CrVMo12-1 |
X160CrMoV121 |
D2 |
Chemical Composition (in weight %)
| C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
| 1.53 |
0.35 |
0.40 |
12.00 |
1.0 |
- |
0.85 |
- |
- |
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 [10
3 x N/mm
2]: 210
Density [g/cm
3]: 7.70
Thermal conductivity [W/m.K]: 20.0
Electric resistivity [Ohm mm
2/m]: 0.65
Specific heat capacity[J/g.K]: 0.46
Coefficient of Linear Thermal Expansion 10-6 oC-1
| 20-100oC |
20-200oC |
20-300oC |
20-400oC |
20-500oC |
20-600oC |
20-700oC |
20-800oC |
| 9.8 |
11.7 |
12.1 |
12.8 |
12.9 |
13.0 |
13.2 |
13.5 |
Continuous Cooling Transformation (CCT) Diagram
Click the image to enlarge the diagram.
Time-Temperature Transformation (TTT) Diagram
Click the image to enlarge the diagram.
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)
| 100oC |
200oC |
300oC |
400oC |
500oC |
525oC |
550oC |
600oC |
700oC |
| 63 |
61 |
58 |
58 |
59 |
58 |
56 |
51 |
35 |
Tempering Diagram
Click the image to enlarge the diagram.
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.
Welding
Consult the alloy supplier for information as to welding.
Forms manufactured: Please see the
Dimensional Sales Program.
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, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.
Unless otherwise specified, registered trademarks are property of Metal Ravne company. Copyright 2011 by Metal Ravne. All rights reserved.
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