OW4
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
OW4 242 1.2510 100MnCrW4 95MnWCr5 O1

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.95 0.25 1.20 0.48 - - 0.13 0.55 -

 

General Information

Description
This alloy is one of the cold work, oil hardening type tool steels. It is relatively inexpensive containing small amounts of manganese, tungsten and chromium. Hardening by oil quench minimizes distortion and cracking.

Applications
Applications include short run tooling for blanking dies, cold forming dies and cutting tools operating at ambient temperature. For working tools, cutting blades, sizing and stamping tools.

 

Properties

Physical properties (avarage values) at ambient temperature:
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 30.0

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 20-700 'C
12.1 12.9 13.3 14.0 14.4 14.8 14.9

Continuous Cooling Transformation (CCT) Diagram
Heat Treatment

Soft Annealing
Heat to 740-770 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 230.

Hardening
Harden from a temperature of 780-820 'C followed by oil, warm bath (180-220 'C) quenching. Hardness after quenching is 64 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 650 'C
64 61 56 51 44 37 34

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1037-875 'C.

Machinability
Machinability of this alloy is very good. It has a rating of 90% that of the W group water hardening low alloy tool steels.