SIRAPID 3247 Steel
Designation by Standards
Brand Name | Ravne | Mat. No. | DIN | EN | AISI/SAE |
SIRAPID 3247 | BRCMO2 | 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 (average values) at ambient temperature
Density [g/cm3]: 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 820-880oC, 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 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Heat up to 450-600oC, then preheat to 850oC, and to 1050oC. Harden from a temperature of 1160-1210oC followed by oil, air quenching or warm bath 550oC. Hardness after quenching is 66-68 HRC.
Transformation temperatures: Ac1=780oC , Ac3=855oC.
Tempering
Tempering temperature: 3 x 1 hour at 520-560oC.
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
Forging
Hot forming temperature: 1095-982oC.
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 purposes. 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 SIJ Metal Ravne company. Copyright 2016 by SIJ Metal Ravne d.o.o. All rights reserved. Contact our Sales Office for more information.
