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Mat.No. 1.2842/DIN 90MnCrV8/AISI O2

Cold work tool steel with high dimensional stability at heat treatment. Very high resistance to cracking. High machinability, medium toughness and resistance to wear.
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  • NO. 1.2842/DIN 90MnCrV8/AISI O2

Designation by Standards

Mat. No. DIN EN AISI
1.2842 90MnCrV8 90MnV8 O2


Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.90 0.25 2.00 0.35 - - 0.13 - -


Applications
Measuring tools, machine knives for the wood, paper and metal industry, cold cutting shear blades, thread cutting tools.

Physical properties (average values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 30.0
Electric resistivity [Ohm mm2/m]: 0.35
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
12.1 13.3 13.8 14.3 14.1 14.2 14.6


Soft Annealing
Heat to 690-720oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.

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

Harden from a temperature of 790-820oC followed by oil or warm bath (180-220oC) quenching. Hardness after quenching is 63-65 HRC.


Tempering Temperature (oC) vs. Hardness (HRC)

100oC 200oC 300oC 400oC 500oC 600oC
63 60 56 50 42 38


Forging
Hot forming temperature: 1050-850oC.


Corrosion Resistance

Corrosion resistance of this alloy is better than that of plain carbon steels. However, it will rust unless given protective treatment.

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 it becomes available.


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