Designation by Standards
| Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| OH255 |
255 |
- |
- |
- |
- |
Chemical Composition (in weight %)
| C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
| 1.00 |
1.10 |
0.30 |
8.00 |
2.70 |
- |
0.30 |
- |
- |
Description
High alloyed cold work tool steel. High hardness and wear resistance with good thoughness.
Applications
Cutting dies, thread rolling tools, roamers, shearing blades, rolls for cold rolling.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10
3 x N/mm
2]: 210
Density [g/cm
3]: 7.73
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 |
| 11.2 |
12.3 |
12.9 |
13.2 |
13.4 |
13.7 |
13.8 |
14.0 |
Continuous Cooling Transformation (CCT) Diagram
Click the image to enlarge the diagram.
Soft Annealing
Heat to 820-860
oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 250.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to
650
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 1040-1080
oC followed by oil or air quenching. Hardness after quenching is min. 60 HRC.
Tempering
Tempering temperature: Please see the diagram bellow.
Tempering Temperature (oC) vs. Hardness (HRC)
| 200oC |
300oC |
400oC |
500oC |
520oC |
540oC |
560oC |
580oC |
600oC |
| 60 |
58 |
59 |
62 |
62 |
61 |
58 |
53 |
50 |
Tempering Diagram
Click the image to enlarge the diagram.
Forging
Hot forming temperature: 1050-900
oC.
Machinability
No data.
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.
Contact our
Sales Office for more information.
