Designation by Standards
| Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| BRM2 |
876 |
1.3343 |
S5-5-2 |
HS6-5-2 |
M2 |
Chemical Composition (in weight %)
| C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
| 0.90 |
max. 0.45 |
max. 0.40 |
4.15 |
4.95 |
- |
1.90 |
6.60 |
- |
Description
M2 is a higher carbon version of the M1 tool steel (Molybdenum High Speed Tool Steel). The M2 alloy has somewhat better wear resistance than M1. Very high resistance to softening at elevated temperatures. Very high resistance to wear. Good toughness and cutting capability. Deep hardening resposnse.
Applications
Primarily used for cutting tools, knives, tap and spiral drills, broaching tools, milling cutters, woodworking tools, cold work tools.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10
3 x N/mm
2]: 217
Density [g/cm
3]: 8.12
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [Ohm mm
2/m]: 0.54
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 |
| 10.7 |
11.7 |
11.9 |
12.4 |
12.7 |
13.1 |
13.4 |
13.4 |
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 820-880
oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 225-280.
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
Heat up to 450-600
oC, then preheat to 850
oC, and to 1050
oC. Harden from a temperature of 1180-1230
oC followed by oil, air quenching or warm bath 550
oC. Hardness after quenching is min. 64 HRC.
Tempering
Tempering temperature: 3 x 1 hour at 540-560
oC.
Tempering Temperature (oC) vs. Hardness (HRC)
| 200oC |
300oC |
400oC |
500oC |
525oC |
550oC |
575oC |
600oC |
650oC |
700oC |
| 63 |
61 |
61 |
62.5 |
64 |
65 |
64 |
62.5 |
57 |
47 |
Tempering Diagram
Click the image to enlarge the diagram.
Forging
Hot forming temperature: 1120-926
oC.
Machinability
M2 is classified as a "medium" machinability tool steel in the annealed condition. It may be shaped by grinding but is relatively poor in regard to capability of being ground. Its machinability rating is 50% as compared to the W group water hardening tool steel.
Corrosion Resistance
Not normally employed in applications requiring corrosion resistance.
Welding
Consult the alloy supplier for information on the advisability of 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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Sales Office for more information.
