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O2 1.2842

Home>Products>Cold Working Tool Steel>O2 1.2842

cold working tool steel Mat.No. 1.2842, DIN 90MnCrV8, AISI O2 block

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Specifications

Designation by Standards

Mat. No.DINENAISI
1.284290MnCrV890MnV8O2

Chemical Composition (in weight %)

CSiMnCrMoNiVWOthers
0.900.252.000.35--0.13--

Description:

Cold work tool steel with high dimensional stability at heat treatment. Very high resistance to cracking. High machinability, medium toughness and resistance to wear. 

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 10ˉ6 °C-1

20-100°C20-200°C20-300°C20-400°C20-500°C20-600°C20-700°C
12.113.313.814.314.114.214.6

Soft Annealing:

Heat to 690-720°C, 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 650°C, 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 790-820°C followed by oil or warm bath (180-220°C) quenching. Hardness after quenching is 63-65 HRC.

Tempering:

Tempering temperature: See the data bellow.

Tempering Temperature (°C) vs. Hardness (HRC)

100°C200°C300°C400°C500°C600°C
636056504238

Forging:

Hot forming temperature: 1050-850°C. 

Machinability:

No data.

Corrosion Resistance:

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

ItemDimension (mm)ProcessDelivery condition
Round BarDIA1.0 - 30Cold-drawing / Centerless grindingBright & Anneal

DIA20 - 80PeelingBright & Anneal

DIA 13-180Hot RolledBlack surface & Anneal

DIA 70 - 400Hot RolledBlack surface & Anneal
Flat BarT 3.0-20 X W 20-100Hot RolledBlack surface & Anneal
BlockT 20-200 X 300-800Hot Rolled & Hot ForgedBlack surface /Machine & Anneal
Wire RodDIA 5.5 - 13Hot RolledBlack surface & Anneal
SheetsT1.0 - 2.5Cold RolledBlack surface & Anneal
T 2.5 - 8.0Hot RolledBlack surface & Anneal



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