Guangzhou Changfeng Steel Co., LTD
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Pre-hardned Hot Rolled Special Alloy Steel Plate 1.2311 / P20
► Similar grades: DIN 1.2311 / AISI P20 / JIS PDS-3 / GB 3Cr2Mo
► Available size(mm):
| Flat Bar Size(mm) | Round bar Size(mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 10-700 | 155-2200 | 2000-6000 | 20-200 | 2000-6000 |
► Introduction:
P20 mould steel is a common alloy tool steel which usually supplied in QT condition. The 1.2311 steel can give an excellent polished finish. DIN 40CrMnMo7 tool steel is one of the most widely used material for machine cut plastic moulds. This grade also provides excellent wear resistance.
► Chemical Composition(%):
| Grade | C | Si | Mn | S | P | Cr | Mo |
| 1.2311 | 0.35-0.45 | 0.20-0.40 | 1.30-1.60 | ≤0.030 | ≤0.030 | 1.80-2.10 | 0.15-0.25 |
| P20 | 0.28-0.40 | 0.20-0.80 | 0.60-1.00 | ≤0.030 | ≤0.030 | 1.4-2.00 | 0.30-0.55 |
► Features:
1, Good hardness uniformity and polishing property,good machining properties.
2, Good integral machanical performance under high temperature.
3, Good heat-resistance and fatigue-resistance.
4, Pre-hardened to HRC30-36, can be directly used for mould processing, shorten the construction period.
5, High putity and homogeneous structure of China's biggest ESR production base for its strict requirement in the whole process of exploitation, smelting, vacuum degassing, ESR, forging, annealing, inspection.
► Recommend heat treatment:
| Quenching | Tempering | ||||||
| Heating temperature/℃ | Cooling way | Hardness (HRC) | Heating temperature/℃ | Cooling way | Hardness (HRC) | ||
| 850-880 | Oil Cooling | 50-52 | 580-640 | Air Cooling | 28-36 | ||
► Applications:
1, Plastic molds for injection compressing and injection molding.
2, TV cabinets,drum mold of washing machine,etc.
3, Often used in the manufacture of television cabinet, washing machine, refrigerator inner shell, buckets, etc.
4, Main components of overloading mold.
► Delivery condition:
Hot rolled or forged, black surface, pre-hardened or tempering to 28-33HRC/30-35HR.
► HEAT TREATMENT of 1.2311 P20 PDS-3 3Cr2Mo
Forging: P20 plastic mould steel are forged at 1093°C (2000°F) down to 899°C (1650°F). Forging below 871°C (1600°F) is not recommended for these steels.
Annealing: Annealing takes place at 760-788°C (1400 to 1450°F) and then the steels are cooled slowly in the furnace at a temperature less than 4°C (40°F) per hour.
Hardening: Heat the steel uniformly to 820-840°C until heated through. Quench in oil.
Tempering: Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.
Product photos:
