ENGINEERING STEELS + ALLOYS
P20 Tool Steel (40CrMnNiMo8-6-4) |
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| P20 is a plastic mould steel that is usually supplied in a hardened and tempered condition. Exhibiting good machinability with better polishability, compared to 1.2312 (AISI P20+S).
Applications: Plastic moulds, frames for plastic pressure dies, hydroforming tools.
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| Colour Code | Stocked Sizes | ||
Red/Yellow |
Rounds Flats
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20.5 mm - 180 mm Dia
50 mm x 12 mm - 100 mm x 30 mm
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| Condition of Delivery |
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| Hardened & tempered, 900 - 1050 N/mm2 | |||
| Related Specifications |
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| Germany | DIN 1.2311 |
| USA | AISI P20 |
| Chemical Composition | |||||||||||
| % | |||||||||||
| Carbon | 0.40 | ||||||||||
| Manganese | 1.50 | ||||||||||
| Chromium | 1.90 | ||||||||||
| Molybdenum | 0.20 | ||||||||||
| Physical Properties | |||||||||||
| Thermal expansion coefficient |  |
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| Thermal conductivity | |||||||||||
| Heat Treatment | |||||||||||
| Soft Annealing | |||||||||||
| Temperature | 710 - 740oC | ||||||||||
| Cooling | furnace | ||||||||||
| Hardness | max 235 HB | ||||||||||
| Stress Relief Annealing | |||||||||||
| Temperature | 500 - 550oC | ||||||||||
| Cooling | furnace | ||||||||||
| Hardening | |||||||||||
| Temperature | 830 - 870oC | ||||||||||
| Cooling | oil or hot bath 180 - 220oC |
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| Hardness | see tempering diagram | ||||||||||
| Thermal Cycle Diagram | |||||||||||
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| Continuous Cooling Transformation Diagram (CCT) | |||||||||||
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| Tempering Diagram | |||||||||||
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