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Plastic Mould Steel P 20

  • Low-carbon mold steels or group P steels are of different types that include P2, P3, P4, P5, P6, P20, and P21 steels. Chromium and nickel are the main alloying elements found in group P steels.
  • P20 tool steels are nitrided or carburized. These steels are capable of being machined into complex and large dies and molds. P20 steels are mostly used in the carburized condition. The presence of chromium and nickel enhances the toughness and hardness of P20 steels.
Chemical composition
PropertiesMetricImperial
Density7.85 g/cc0.284 lb/in3
Thermal Properties
PropertiesConditions T (°C) Treatment
Thermal expansion 12.8 x 10-6/ºC20-425 -
Physical Properties
PropertiesMetricImperial
Density7.85 g/cc0.284 lb/in3
Mechanical Properties
PropertiesMetricImperial
Hardness, Brinell (typical)30033
Hardness, Rockwell C (typical)3030
Tensile strength, ultimate965-1030 MPa140000-150000 psi
Tensile strength, yield827-862 MPa120000-125000 psi
Charpy impact (V-Notch)27.1-33.9 J20.0-25.0 ft-lb
Poisson’s ratio0.27-0.300.27-0.30
Elastic modulus190-210 GPa27557-30457 ksi
Principal Design Features

This alloy is in the category generally labeled as Mold Steels. Nickel and chromium are the alloying elements for hardness and toughness. This alloy is most often used in the carburized condition.

Tempering

P20 tool steels are tempered at 482-593°C (900 to 1100°F) for a Rockwell C hardness of 37 to 28.

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.

Cold Working

P20 tool steels are capable of being readily cold worked by using conventional tooling methods with the alloy in the annealed condition.

Forging

P20 tool steels 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.

Heat Treatment

P20 tool steels are heated to 871-899°C (1600-1650°F) in the carburizing medium during the carburizing process. After being carburized, these steels are heated to 816-871°C (1500-1600°F) in order to be hardened and then held for 15 minutes and finally oil quenched.

Applications

P20 tool steels are used for low temperature applications that include injection molds and die casting dies.