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O2 1.2842

Id-dar>prodotti>Azzar tal-Għodda tax-Xogħol kiesaħ>O2 1.2842

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

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speċifikazzjonijiet

Designation by Standards

Mat. Nru.DINENAISI
1.284290MnCrV890MnV8O2

Chemical Composition (in weight %)

CSiMnCrMoNiVWoħrajn
0.900.252.000.35--0.13--

deskrizzjoni:

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

Applikazzjonijiet:

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.

It-Taffija tal-Istress:

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.

Tibbies:

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.

Ittemprar:

Tempering temperature: See the data bellow.

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

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

Forġa:

Hot forming temperature: 1050-850°C. 

Makkinabilità:

No data.

Reżistenza għall-korrużjoni:

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

PuntDimensjoni (mm)ProċessKondizzjoni tal-kunsinna
Bar tondDIA1.0 - 30Cold-drawing / Centerless grindingBright & Anneal

DIA20 - 80TqaxxirBright & Anneal

DIA 13-180Irrumblat bis-sħanaWiċċ iswed & Anneal

DIA 70 - 400Irrumblat bis-sħanaWiċċ iswed & Anneal
Bar ĊattT 3.0-20 X W 20-100Irrumblat bis-sħanaWiċċ iswed & Anneal
BlokkT 20-200 X 300-800Hot Rolled & Hot ForgedBlack surface /Machine & Anneal
Virga tal-wajerDIA 5.5 - 13Irrumblat bis-sħanaWiċċ iswed & Anneal
LożorT1.0 - 2.5Irromblati kesħinWiċċ iswed & Anneal
T 2.5 - 8.0Irrumblat bis-sħanaWiċċ iswed & Anneal


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