P20+Ni Plastic Mould Steel Plate
P20+Ni Plastic Mould Steel Plate is a multi-functional low alloy Tool steel, which is characterized by good toughness at medium strength level. Special purpose die steel P20+Ni steel plate is usually used for Injection mold construction cavity and mold as well as zinc die-casting mold. The P20 mold steel plate material is usually sold in a pre hardened state with a hardness of approximately 300 HBW.
P20+Ni mould steel varies in different countries and regions. In Europe, DIN specification DIN EN ISO 4957 standard materials (1.2738) is generally used, while in the Japanese steel industry standard, PX5 is the new standard P20. In American countries, P20 grade steel is the most commonly used and widely used steel grade material. In China, 3Cr2MnNiMo is equivalent to P20+Ni steel grade in GB/T 1299 Tool steel specification.
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Comparable Standard
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Grade
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AISI
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W.Nr
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GB
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718
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P20+Ni
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1.2738
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3Cr2MnNiMo
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Chemical Composition %
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C
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Si
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Mn
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Cr
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Mo
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Ni
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0.28-0.4
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0.2-0.8
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1.0-1.5
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1.4-2.0
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0.3-0.55
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0.8-1.2
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Physical Properties
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Coefficient of thermal expansion
10^-6 m/m*°C
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20-100 °C
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20-200°C
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20-300°C
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Thermal conductivity
W/mk
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20°C
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350°C
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700°C
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11.5
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12.7
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13.5
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34.2
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33.6
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33.1
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Product Picture
Heat treatment of P20+Ni materials
- Stress relief
Preheating: Because the mold steel P20 steel plate is sold in a pre hardened state, there is no need for hardening heat treatment. After intermittent processing and during use, the thermal stress of the steel must be eliminated by heating to 900 º F (482 º C), equalizing the thickness per inch (25.4 mm), and holding it for one hour, then cooling it in air to ambient temperature.
In rare cases where AISI steel P20 must be re hardened, the steel must be annealed before hardening.
- Hardening
Critical temperature: Ac1:1405 º F (763 º C)
Preheating of P20 metal: Heat at a rate not exceeding 400 º F (222 º C) per hour to 1150-1250 º F (621-677 º C) and equalize.
Austenitization (high temperature)
Rapid heating from preheating to 1550 º F (843 ° C). Soak the first inch (25.4 mm) of thickness for 30 minutes, with each additional inch (25.4 mm) soaked for 15 minutes.
- Quenching
Pressurize the gas or interrupt the oil to reach 150-125 º F (66-51 º C).
For oil, quench to black at approximately 900 ° F (482 ° C) and then cool to 150-125 ° F (66-51 ° C) in still air.
- Tempering
P20 Tool steel is tempered at 482-593 ° C (900 to 1100 ° F) with Rockwell hardness C of 37 to 28.
- Annealing
AISI P20 Tool steel is annealed at 760-788 ° C (1400 to 1450 ° F) and then slowly cooled in the furnace at a temperature below 4 ° C (40 ° F) per hour.
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Packing & Delivery
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The inner size of container is below:
-- 20ft GP: 5.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft GP: 11.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft HG: 11.8m(length) x 2.13m(width) x 2.72m(high
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