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Plastic mould steel-1.2312

Equivalent grades GB  DIN AISI JIS  DAIDO
      40CrMnMoS8-6 1.2312 P20+S - -
Chemical Composition C Si Mn Cr Mo S     P V W Other
0.35-0.45 0.30-0.50 1.40-1.60 1.80-2.00 0.15-0.25 0.05-0.10 0.03MAX - - -
Available size Round Bar Diameter Length
60-800mm 2000-6000mm
Flat Bar Thickness Width Length
25-400mm 200-800mm 2000-6000mm
Surface condition Black surface/ Grinded/ Machined
Annealed hardness 235HBS max
Characteristics 1.2312 mould steel with additional sulphur, usually supplied in a quenched and tempered condition. Polishable, better machinability compared to 1.2311 
Applications plastic moulds, frames for plastic pressure dies, hydroforming tools
Heat Treatment Soft Annealing Heat to 710-740℃, cool slowly in furnace. This will produce a maximum Brinell hardness of 230.
Stress Relieving Stress relieving to remove machining stresses should be carried out by heating to approx. 650℃, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening Harden from a temperature of 830-880oC followed by oil or quenching or warm bath quenching 180-220℃. Hardness after quenching is 51 HRC.
Tempering  100 200 300 400 500 600 700
HRC 51 50 48 46 42 36 28

Plastic mould steel-1.2312
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