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Die Steel EN31

EN31 is a high carbon Alloy steel which achieves a high degree of hardness with compressive strength and abrasion resistance.

Density7.85 g/cc0.284 lb/in3

Forge at 1000°/1050°C. Heat slowly, allowing sufficient time at the forging temperature for the steel to be thoroughly soaked through. Re-heat as often as necessary to keep the temperature above 850°C. After forging cool very slowly, preferably in a furnace.


Heat uniformly to 800°C, equalize, then furnace cool. (Hardness about 229 Brinell).

Stress Relieving

If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 700°C, equalize, then cool slowly.


Heat uniformly to 800/820°C until heated through. Allow 30 minutes per inch of ruling section and quench immediately in oil.


Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness

Tempering °C100150200v250300350
Physical Properties
Name of MaterialComposition in % of WeightThermal conductivity W/m-kDensity Kg/m^3Melting Point
CMn Si Cr S P Mg
En-31 IS-103 Crl1.50.52 0.22 1.3 0.05 0.05 -46.678101540
Mechanical Properties
Tensile Strength750 N/mm²
Yield Stress450 N/mm²
Reduction of Area45%
Modulus of elasticity215 000 N/mm²
Density7.8 Kg/m3
Hardness63 HRC
Heat Treatment
Hardening Temperature802˚- 860˚ C
Quenching MediumOil
Tempering Temperature180˚- 225˚ C
Brinell-Rockwell Hardness59 - 65