A HRC 40 prehardened mould steel
Premium mould steel that meets or exceeds standards for grades W 1.2738HH.

Material properties
Prehardened steel for medium and very large – size moulds and tools with good machinability. Consistent texturing and polishing improved by very low sulphur content. Reliable repair welding and good thermal conductivity.

For which tools
Plastic injection mould cores and cavities, large – size moulds for bumpers, dashboards, fenders, television panels, bottle crates, etc.

For which plastics
Thermoplastics, thermosetting plastics, ABS, transparent melts. Injection moulding, compression moulding, RIM moulding, etc.

Chemical Analysis
Typical values (weight%)

C	Si	S	Ni	Cr	Mo	V	B
0.26	0.10	0.002	0.30	1.70	0.52	0.05	+

Mechanical Properties
Bozhong 2738 mod. HH is delivered quenched and tempered to 330 – 360 HB (34 – 38 HRC).

Test thickness	Test hardness	Yield strength	Tensile strength
400 mm	345 HB	940 N/mm²	1095 N/mm²

Delivery Conditions
Typical delivery sizes

Manufacturing process	Thickness	Width
Hot rolling	15 – 150 mm	1000 – 2000 mm
Hot forging	150 – 1200 mm	1200 – 2000 mm