P20 Plastic Mold Steel
1.2311
- EN1.2311
- EN40CrMnMo7
- AISIP20
Pre-hardened (28–32 HRC) plastic mold steel with high toughness and good wear resistance; better polishability than 1.2312.
01Material Properties
- Uniform hardness distribution across sections up to 300 mm
- Good polishability
- Good weldability
- Recommended working hardness is the delivery hardness
- Suitable for nitriding
- High toughness
- Relatively easy to machine despite being pre-hardened
02Applications
- Cores of plastic injection molds up to A2 surface quality
- Plastic and metal injection molds
- Mold holders and extrusion press containers
- Machine parts, wear plates
03Delivery Condition
- Pre-hardened, 280–320 HB
04Heat Treatment
Typical values
- Delivery condition
- Pre-hardened 280–325 HB
- Stress relieving
- 550–600 °C after rough machining; furnace cooling
- Re-hardening
- 840–870 °C, oil → ≈ 50–52 HRC
- Tempering (after re-hardening)
- 500–600 °C → 30–40 HRC
- Nitriding
- 500–550 °C → surface ≈ 600–650 HV
Heat treatment cycle (schematic)
Tempering diagram (approximate)
Values are approximate and for information only; they vary with section size, heat and furnace conditions. Binding values are determined from the manufacturer’s data under laboratory conditions.
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