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1.2738 HH (40CrMnNiMo8-6-4) Tool Steel

Low sulphur plastic mould steel that is usually supplied in a quenched and tempered condition. The additional Ni content improves the through hardenability large dimensions (>400 mm). Good machinability, better polishability compared to 1.2312 (AISI P20+S). Similar to AISI P20+Ni.

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Area of Application

Large plastic moulds higly stressed in core, hydroforming tools.

Chemical Composition

Code: 1.2738, MCMN, 40CrMnNiMo8-6-4, P20

Carbon	Chromium	Molybdenum	Manganese	Nickel
C	Cr	Mo	Mn	Ni
0,40	1,90	0,20	1,50	1,00

Heat Treatment

	Temperature	Cooling	Hardness
Soft Annealing	710 - 740 °C	Furnace	235 HB
Stress Relief Annealing	500 - 550°C	Furnace
Hardening	830 - 870°C	oil or hot bath 180 - 220°C	see tempering diagram

Mechanical Properties

Hardness

30 - 48

HRC

Physical Properties

Thermal Expansion Coefficient	11,8 - 13,3	1/K * 10^-6
Thermal Conductivity (20°C)	39,5	W/mK
Density	7,85	g/cm³

1.2738 HH (40CrMnNiMo8-6-4) Tool Steel

1.2738 HH (40CrMnNiMo8-6-4)

Low sulphur plastic mould steel that is usually supplied in a quenched and tempered condition. The additional Ni content improves the through hardenability large dimensions (>400 mm). Good machinability, better polishability compared to 1.2312 (AISI P20+S). Similar to AISI P20+Ni.

Area of Application

Chemical Composition

Code: 1.2738, MCMN, 40CrMnNiMo8-6-4, P20

Carbon

Chromium

Molybdenum

Manganese

Nickel

C

Cr

Mo

Mn

Ni

0,40

1,90

0,20

1,50

1,00

Heat Treatment

Temperature

Cooling

Hardness

Soft Annealing

710 - 740 °C

Furnace

235 HB

Stress Relief Annealing

500 - 550°C

Furnace

Hardening

830 - 870°C

oil or hot bath 180 - 220°C

see tempering diagram

Mechanical Properties

Hardness

30 - 48

HRC

Physical Properties

Thermal Expansion Coefficient

11,8 - 13,3

1/K * 10-6

Thermal Conductivity (20°C)

39,5

W/mK

Density

7,85

g/cm3

1/K * 10^-6

g/cm³