DIN1.2312 P20+S Plastic Mold Steel

DIN1.2312 P20+S Plastic Mold Steel p20+s plastic mold steel DIN1.2312 P20+S Plastic Mold Steel DIN1

DIN1.2312 P20+S Plastic Mold Steel


P20+S Plastic mold steel with excellent machinability properties because of the high S content, good toughness properties, good wear resistance, uniform hardness in all dimensions, dimensional stability, requiring no heat treatment, 280-325HB hardened and tempered condition, suitable for nitriding to increase wear resistance, not suitable for chrome plating, polishing and etch graining.


P20+S Plastic Mold Steel is ideally suited for the production of moulds where improved machinability is required. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds. The versatility of this plastic mould tool steel with its high tensile characteristics enables uses for a variety of other applications such as shafts and wear strips.

Quality Standard

ASTM A681 Standard Specification for Tool Steel

All Grades Comparison

ASTM A681 Werkstoff
P20+S 1.2312

Chemical Composition(%)

C Si Mn P S Cr Mo
0.35-0.45 0.30-0.50 1.40-1.60 0.030 max 0.05-0.10 1.80-2.00 0.15-0.25


Forging: Heat slowly, allowing sufficient time for the steel to become heated through. Begin forging at 1050°C. Do not forge below 930°C reheating if necessary. After forging, cool very slowly.

Annealing: Heat uniformly to 710-740°C. Soak well, cool slowly in the furnace.

Stress Relieving:When dies are heavily machined, we recommend stabilising just before finish machining in order to relieve machining strains. Heat to 460-500°C. Soak well and allow to cool in the air.

Hardening: Heat uniformly to 830-870°C until heated through. Quench in oil.

Tempering: Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.

Tempering Temperature Hardness(HRC) Tensile Strength (Mpa)
100oC 51 1730
200oC 50 1670
300oC 48 1570
400oC 46 1480
500oC 42 1330
600oC 36 1140

Nitriding: Tools machined from pre-hardened P20+S Plastic Mold Steel may be nitrided to give a wear resistant case of approximately Rockwell C60 surface hardness with a case depth of 0.35mm to 0.5mm. Nitriding also increases the corrosion resistance. After nitriding at 525°C in ammonia gas the surface hardness of the tool will be approximately 650HV.

Temperature Time (hours) Approx. Depth of Case (mm)
525oC 20 0.3
525oC 40 0.35
525oC 60 0.50

Case Hardening: Tools produced from P20+S Plastic Mold Steel may be case hardened, which can achieve a surface hardness of between 55 to 59 Rockwell C.

Hard Chromium Plating: To avoid hydrogen embrittlement P20+S Plastic Mold Steel should be tempered for 4 hours at 180°C for 4 hours after hard chromium plating

Induction Hardening:Induction or flame hardening of will achieve a hardness of 50 to 55HRc. It is preferable to air cool, though smaller components may require forced cooling. Temper immediately after hardening.

Mill′s test certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

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