OH239
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
OH239 239 1.2767 X45NiCrMo4 40NiCrMoV16 -

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.45 0.25 0.35 1.35 0.25 4.05 - - -

 

General Information

Description
Nickel cold work tool steel. Goof hardenability and thougness. Ability for polishing, photoetching and erosion treatment.

Applications
Forging tools, dies of all sort, shapes and sizes, hot forging and pressing tools for steel and metal. Moulds, bushings, piercers, etc.

 

Properties

Physical properties (avarage values) at ambient temperature:
Density [g/cm3]: 7.84
Thermal conductivity [W/m.K]: 28.0

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
11.7 12.5 13.0 13.4 13.7 13.8

Continuous Cooling Transformation (CCT) Diagram


Time-Temperature Transformation (TTT) Diagram


 

Heat Treatment

Soft Annealing
Heat to 610-850�C, cool slowly in furnace. This will produce a maximum Brinell hardness of 262.

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 840-870�C followed by oil. air or warm bath (180-220�C) quenching. Hardness after quenching is 56 HRC.

Tempering
Tempering temperature: 150-400�C.

Tempering Temperature (�C) vs. Hardness (HRC)
100�C 200�C 300�C 400�C 500�C 600�C
56 54 50 46 42 38

Effect of Tempering Temperature on Hardness

 

 

Workability


Forging
Hot forming temperature: No data.

Machinability
No data.