Tool Steel / Plastic Mold Steel

Chemical Composition

	C	Si	Mn	P	S	Cr	Mo
Typical analysis	0.38	0.30	1.50	0.020	0.003	2.00	0.20
Chemical composition as per SEL	0.35-0.45	0.20–0.40	1.30–1.60	0.035	0.035	1.80–2.10	0.15–0.25

 

Register of European Steels (SEL)	40 CrMnMo 7
DIN EN ISO 4957	40 CrMnMo 7
AFNOR	40 CMD 8
AISI	~ P 20
BS	~ P 20

Characteristics
Standard mould steel, economical to machine, easy to polish, hard chrome plateable,
grain reliable, for dimensions  400 mm thick.
Where there is a requirement for

• Higher hardness and better through-hardenability
• Polishability > 320 grit
• Sensitive etch designs (e.g. HNO3)
• Higher thermal conductivity

we recommend grade 2738mod.TS(HH).

Applications
Small and medium-sized injection moulds, press moulds and mould frames up to 400 mm thick.

Delivered condition
Quenched and tempered to 280–325 HB ( approx. 950–1100 MPa)*
Physical properties (reference values)

Physical properties (reference values)

Thermal expansion coeffi cient (10–6/K)	20–100 °C 11.6	20–250 °C 12.8	20–500 °C 14.3
Thermal conductivity (W/mK)	20 °C 34.0	250 °C 33.5	500 °C 33.0
Young’s modulus (GPa)	20 °C 212	250 °C 197	500 °C 175