P20 MOULD STEEL - ACTON BRIGHT STEEL TECHNICAL GUIDE
P20 (1.2311) Pre hardened to approximately BHN 300 (1000 n/mm2), P20 requires no further heat treatment, therefore avoiding risk of distortion or cracking. Although pre-hardened P20 is still capable of being machined and of giving a good polished finish. Typical applications include: Plastic moulds, backers, bolsters, die holders.
P20S (1.2312) Delivered pre-hardened, this material is ready for use at approximately BHN 280/325, similar to P20 (1.2311) but with a higher sulphur content which provides much improved machinability. This grade is not suitable for polishing or other applications requiring a fine finish. Typical applications include: large mould frames and bolsters.