Steel Standard and Grade
AISI P20; DIN 1.2311; ASSAB 618; GB 3CrMO2

P20 is a pre-hardened high tensile tool steel which offers ready machineability in the hardened and tempered condition, therefore does not require further heat treatment. This eliminates the risks, cost, and waiting time of heat treatment thus avoiding the associated possibility of distortion or even cracking. Subsequent component modifications can easily be carried out.

1. Features:
P20, American AISI standard pre-hardened plastic mold steel, good machining performance, excellent polishing performance, a certain toughness, can be carburized, surface hardness is up to 65HRC after carburizing quenching, with higher hot hardness and wear resistance.

2. Supply Condition: Pre-hardened, Hardness 30~35HRC.

3. Transformation temperature(Approx): AC1=770° C, AC3=825° C, Ar1=640° C, Ar3=760° C, Ms=300° C, Mf=120° C

4. Thermal processing specification: Heating temperature 1100~1150° C, Beginning forging temperature 1050~1100° C, Ending forging temperature ≥ 850° C, then air cooling.

5. Annealing specification: Heating temperature 1100~1150° C, holding time 2 ~ 4 h, the isothermal temperature 720° C, holding time 4 ~ 6h, furnace cooling to 500° C, released, then air cooling.

6. Quenching and Tempering specification:
Quenching temperature 860~870° C, oil quenching, Tempering temperature 540~580° C, hardness 30~35HRC.

7. P20 Plastic Mould Steel of Applications:
1) Thermoplastic injection mold and extrusion mold
2) Thermoplastic blowing mold
3) Main parts of heavy-duty mold
4) Structural fabrications
5) Usually used for manufacture of television casing, washing machine, refrigerator inner shell, and water-pot, etc.