
P20 MOULD STEEL
P20 is an alloy tool steel which delivers and superb polished finish. As a result this is widely specified for machined plastic moulds. Supplied in the hardened condition P20 offers excellent wear resistance.
We can supply P20 in flats, and squares in metric or imperial. We can also cut to order.
P20 – Supplied pre hardened to approximately 300 Brinell, P20 mould steel requires no further heat treatment therefore avoiding risk of distortion or cracking. Pre-hardened P20 can still be machined and of giving a good polished finish.
Typical applications:Plastic moulds, backers, bolsters, die holders. P20 is also used in other applications such as shafts, rails and wear strips.
P20S – is delivered pre-hardened. This material is ready for use with a hardness range of 280-325 Brinell. Its chemical composition is similar to P20 mould steel but has a higher sulphur content which provides much improved machinability. Note: this grade is not suitable for polishing or other applications requiring a fine finish.
Typical applications: Suitable for large mould frames and bolsters
P20N – is delivered pre-hardened ready for use with a hardness range of 280-325 Brinell. P20N has added Nickel to ensure consistent hardness through large sections. Easy to polish and readily machinable.
Typical applications: Used for quality for pressing and injection moulding tools. If the section exceeds 400mm P20 will not provide a consistent through hardness. Suitable for hard chrome plating and for nitriding.
TYPICAL CHEMICAL COMPOSITION OF P20 MOULD STEEL |
||||
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C |
Si |
Cr |
Mn |
Mo |
0.40% | 0.40% | 1.20% | 1.00% | 0.35% |
Forging:
Heat slowly and allow sufficient time for the P20 to become heated through. Begin forging at 1050°C.
Do not forge below 930°C reheat if necessary. After forging, cool very slowly.
Annealing:
Heat uniformly to 770-790°C. Soak well, then cool slowly in the furnace.
Hardening:
Heat the P20 uniformly to 820-840°C until heated through. Quench in oil.
Tempering:
Heat uniformly and soak at the required tempering temperature for at least one hour per 25mm of section.
Allow to cool in still air..
TEMPERING P20 TOOL STEEL |
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---|---|---|---|---|---|---|
TEMPERING °C |
100 |
200 |
300 |
400 |
500 |
600 |
HRC |
51 |
50 |
48 |
46 |
42 |
36 |