420 ESR Plastic Mold Steel
1.2083 ESR
- EN1.2083
- ENX40Cr14
- AISI420
Plastic mold steel with excellent polishability and high corrosion resistance, remelted (ESR) for cleanliness.
01Material Properties
- Very high polishability
- High corrosion resistance
- Retains surface quality over long service
- Hardenable up to 52 HRC
- Not suitable for nitriding
- Suitable for coating
- Limited texturing capability
02Applications
- Molds for corrosive conditions and stainless (slow-rusting) mold requirements
- Injection molds for corrosive plastics
- Molds processing corrosive plastics such as PVC
- Molds requiring A1+ mirror polish
- Knives, molds and other parts for the food industry
03Delivery Condition
- 241 HB, soft annealed
04Heat Treatment
Typical values
- Soft annealing
- 760–800 °C; max. 230 HB
- Stress relieving
- 600–650 °C
- Preheating
- 600–650 °C and 850 °C
- Hardening
- 1000–1050 °C; 15–30 min
- Quenching medium
- Oil, air/pressurised gas or 500–550 °C salt bath
- As-quenched hardness
- ≈ 54–56 HRC
- Tempering
- 180–250 °C, twice → 50–54 HRC; avoid 400–550 °C
- Working hardness
- 48–54 HRC
- Note
- Polished/passivated surface for corrosion resistance
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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