STANDARDS :  40CRMNNIMO8-6-4

DIN 2738	P20+Ni	AISI P20+Ni
C 0.42	Mn 1.50	Cr 1.95	Ni 1.10	Mo 0.20

 

DIN 1.2738 is specially used for Plastic injection die moulds. The characteristics of a material are right sharpening, photo-etching properties with high purity and good homogeneity. DIN 2738 is upgraded version of plastic mold steel 0f 2311, which normally supply in Pre hardened condition. Hardness in as supplied condition 280-320 HB with having uniform hardness. The additional nickel content of 1 % increases through hardening. It has good machinability, suitable for Texturing, fine polishability, adequate corrosion resistance, vacuum-degassed steel.

 

DIN 2738 High Hard ( HXM 24 )
 

The modified version of 2738 is with High Hardness 360-400 BHN and increase alloy elements to get extra life and outstanding polishing.

Steel Properties

DIN 2738 is upgrade version of plastic mold steel 0f 2311, which normally supply in Pre hardened condition. Hardness in as supplied condition 280-320 HB. The additional nickel content of 1 % increases through hardening. It is micro-alloyed. It has good machinability, suitable for texturing, outstanding polishability, adequate corrosion resistance. vacuum-degassed steel with the following excellent features.

Coefficient of thermal expansionat °C	20-100	20-200	20-300	20-400	20-500	20-600	20-700
10-6 m/(m*K)	11.2	12.8	13.5	13.7	14.3	14.7	14.9

 

Thermal Conductivity at °C	20	350	700
W/(m*K)	35	34	33

 

Heat Treatment

Soft annealing °C	Cooling	Hardness HB
710 – 740	Furnace	max. 235

 

Hardening °C	Quenching	Hardness after quenching HRC
840 – 870	Polymer or oil	51

 

Tempering °C after Quenching	100	200	300	400	500	600	700
HRC	51.5	50.2	48	46.2	43	39	29