Designation by Standards
| Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| BRCMO2 |
883 |
1.3247 |
S2-10-1-8 |
HS2-9-1-8 |
M42 |
Chemical Composition (in weight %)
| C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
| 1.10 |
max. 0.70 |
max. 0.40 |
4.00 |
9.50 |
- |
1.10 |
1.55 |
Co: 8.00 |
Description
Capable of very high hardness values, this is a moly type high speed tool steel. The alloy has excellent hot hardness and wear resistance and is commonly employed to machine difficult to machine materials including the superalloys.
Applications
Typically employed to machine the superalloys and exotic, M42 is employed in drills, hobs, taps, end mills, milling cutters, form and gear cutters, broaches and chasers.
Physical properties (avarage values) at ambient temperature
Density [g/cm
3]: 8.01
Thermal conductivity [W/m.K]: 19.0
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 |
10.8 |
11.1 |
11.6 |
11.9 |
12.2 |
12.5 |
12.6 |
Soft Annealing
Heat to 820-880
oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-300.
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 1160-1210
oC followed by oil, air quenching or warm bath 550
oC. Hardness after quenching is 66-68 HRC.
Transformation temperatures: Ac
1=780
oC , Ac
3=855
oC.
Tempering
Tempering temperature: 3 x 1 hour at 520-560
oC.
Tempering Temperature (oC) vs. Hardness (HRC)
| 200oC |
300oC |
400oC |
500oC |
520oC |
540oC |
560oC |
580oC |
600oC |
650oC |
700oC |
| 62.5 |
61 |
61.5 |
66.5 |
68 |
68 |
67 |
65.5 |
64 |
50 |
42 |
Tempering Diagram
Click the image to enlarge the diagram.
Forging
Hot forming temperature: 1095-982
oC.
Machinability
Rated at 45% of a 1% carbon steel, the alloy, in its annealed condition, can be turned, drilled, tapped, milled, broached and threaded.
Corrosion Resistance
Not normally employed in applications requiring corrosion resistance.
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.
