OSIKRO4
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
OSIKRO4 827 1.2550 60WCrV7 - S1

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.60 0.85 0.30 1.05 - - 0.15 1.45 -

 

General Information

Description
This steel is one of the shock resisting tool steel types with very good thoughness in combination with high hardenability. Impact-resistant, tungsten-alloyed cold-work tool.

Applications
For cutting tools (dies, punchers) for plate, woodworking tools, blanking dies for cutting sheet metals up to 12 mm thickness, trimming and spliting dies, cold piercing punches, performing punches, shear blades, chipping knives, pneumatic chisels, coining tools, cold shear blades, ejectors.

 

Properties

Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 190-210
Density [g/cm3]: 7.93
Thermal conductivity [W/m.K]: 25.0
Electric resistivity [Ohm mm2/m]: 0.30
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C
11.0 12.5 13.0 13.5 14.9

Continuous Cooling Transformation (CCT) Diagram

 

Heat Treatment

Soft Annealing
Heat to 710-750 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 225.

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 860-900 'C followed by oil or hot bath (180-220 'C) quenching. Hardness after quenching is 60 HRC.

Tempering
Tempering temperature: See the data bellow.

Tempering Temperature ( 'C) vs. Hardness (HRC)
100 'C 200 'C 300 'C 400 'C 500 'C 600 'C
60 58 56 52 48 43

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1050-900 'C.

Machinability
No data.