Tool Steel P20

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.


Typically used for relatively low temperature applications such as die casting dies and injection molds.


Machinability is relatively good at about 80% that of the W group water hardening steels.


P20 may readily be formed by conventional methods with the alloy in the annealed condition.


This alloy is weldable by conventional methods. Contact the alloy supplier for details and weld procedures.

Heat Treatment

For carburizing heat to 1600-1650 F in the carburizing medium. For hardening after carburizing heat to 1500 – 1600 F and hold for 15 minutes then oil quench.


Forge at 2000 F down to 1650 F. Do not forge below 1600 F.

Hot Working

See “Forging”.

Cold Working

P20 may be readily cold worked by conventional tooling with the alloy in the annealed condition.


Anneal at 1400 to 1450 F and slow cool in the furnace at a rate of less than 40 F per hour.


Not applicable to this alloy.


Temper at 900 to 1100 F for a Rockwell C hardness of 37 to 28.


See “Heat Treating” and “Tempering”.

Density: 0.283

Specific Gravity: 7.85

Melting Point: 2600

MoETensile: 29


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