OH237
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
OH237 237 - - - S5

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.57 2.00 0.80 0.30 0.78 - 0.25 - -

 

General Information

Description
Cold work tool steel. Shock resisting tool steel with good toughness at high strength levels.

Applications
Different cutting parts, chisels, rivet sets, punches, driver bits.

 

Properties

Physical properties (avarage values) at ambient temperature:
Density [g/cm3]: 7.74

Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C 20-600 'C 20-700 'C
13.1 13.7 14.4 14.4 14.7 14.9 15.0


Continuous Cooling Transformation (CCT) Diagram



Time-Temperature Transformation (TTT) Diagram



 

Heat Treatment

Soft Annealing
Heat to 770-800 '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 880-920 'C followed by oil quenching. Hardness after quenching is 63 HRC.

Tempering
Tempering temperature: See the data bellow.

Tempering Temperature ( 'C) vs. Hardness (HRC)
100 'C 200 'C 300 'C 400 'C 500 'C 550 'C
62 60 58 56 50 48

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1050-900 'C.

Machinability
No data.