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  • AISI P20+ni / 1.2738, DIN 40CrMnNiMo8-6-4
  • AISI P20+ni / 1.2738, DIN 40CrMnNiMo8-6-4

AISI P20+ni / 1.2738, DIN 40CrMnNiMo8-6-4

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Specification, Chemical & Mechanical Performance

esignation by Standards


Brand Name Ravne No. Mat. No. DIN EN AISI
UTOPNIN 249 1.2738 40CrMnNiMo8-6-4 - P20 Mod.


Chemical Composition (in weight %)


C Si Mn Cr Mo Ni V W Others
0.40 0.30 1.45 1.95 0.20 1.05 - - -


This steel is in the category generally labeled as Mold Steels. Nickel and chromium are the alloying elements for hardness and toughness. Cold work tool steel with good machinability, excellent polishability, suitable for texturing. Improved through hardenability comapred to Mat.No. 1.2311.

Typically used for relatively low temperature applications such as die casting dies and injection molds, synthetic plastic moulds dies, for large moulds. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 205 
Density [g/cm3]: 7.80
Thermal conductivity [W/m.K]: 29.0 
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1


20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC
11.7 12.3 13.0 13.3 13.7 13.7 14.0


Continuous Cooling Transformation (CCT) Diagram

Soft Annealing
Heat to 710-740oC, cool slowly. This will produce a maximum Brinell hardness of 235.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Harden from a temperature of 840-880oC followed by oil, air ot warm bath (180-220oC) quenching. Hardness after quenching is 52 HRC.

Tempering temperature: See the data bellow.

Tempering Temperature (oC) vs. Hardness (HRC) vs. Tensile Stregth (N/mm2)


100oC 200oC 300oC 400oC 500oC 600oC 700oC
52 51 49 46 42 36 28
1790 1730 1620 1480 1330 1140 920


Tempering Diagram

Hot forming temperature: 1093-898oC. 

Machinability is relatively good at about 80% that of the W group water hardening steels. 

This alloy is weldable by conventional methods. Contact the alloy supplier for details and weld procedures.

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available