Mat.No. 1.2738, DIN 40CrMnNiMo8-6-4, AISI P20 Mod

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Designation by Standards Mat. No. DIN EN AISI 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 - - - Description 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 harde...

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Designation by Standards

Mat. No.	DIN	EN	AISI
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	-	-	-

Description
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.

Applications
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

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

Continuous Cooling Transformation (CCT) Diagram

Soft Annealing
Heat to 710-740^oC, 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 650^oC, 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 840-880^oC followed by oil, air ot warm bath (180-220^oC) quenching. Hardness after quenching is 52 HRC.

Tempering
Tempering temperature: See the data bellow.

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

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

Tempering Diagram

Forging
Hot forming temperature: 1093-898^oC.

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

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

Disclaimer
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.