OCR12
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
OCR12 812 1.2080 X210Cr12 - D3

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
2.05 0.25 0.30 11.50 - - - - -

 

General Information

Description
D3 is an oil hardening, high carbon/chromium type tool steel with very high wear resistance. It hardens with a very slight change in size. The alloy possesses very high compressive strength and is deep hardening.

Applications
Cutting tools, stamping, woodworking, drawing, deep drawing and pressing tools, cold working rolls, measuring tools.

 

Properties

Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.67
Thermal conductivity [W/m.K]: 20.0
Electric resistivity [Ohm mm2/m]: 0.65
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 20-600�C 20-700�C
11.7 12.0 12.4 12.9 13.3 13.6 14.0

Continuous Cooling Transformation (CCT) Diagram



Time-Temperature Transformation (TTT) Diagram


 

Heat Treatment

Soft Annealing
Heat to 800-840�C, cool slowly. This will produce a maximum Brinell hardness of 250. To secure uniform softness.

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 940-980�C followed by oil quenching or warm bath approx. 400�C. Hardness after quenching is 64-66 HRC.

For small parts up to thickness 30 mm. Harden from a temperature of 960-100�C followed by air, comompressed air quenching. Hardness after quenching is 63-65 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
64 62 60 57 53 42

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1050-850�C.

Machinability
The machinability rating of D3 is roughly 25 % that of free machining carbon steel 1018. Due to its abrasion resistant nature, machining in the hardened condition should be limited to finish grinding.