Steel Standard and Grade
AISI P20 / GB 3Cr2Mo / DIN 1.2311 / ASSAB 618
Plastic Tool Steel P20/DIN 1.2311/618/GB 3cr2mo is a pre hardened high tensile tool steel which offers good mechanical character in the hardened and tempered condition.

Features:
1. P20/DIN 1.2311/618/GB 3cr2mo 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.

Plastic Tool Steel P20/DIN 1.2311/618/GB 3cr2mo 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.