31CrMoV9/1.8519 Alloy Steel

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31CrMoV9/1.8519 Alloy Steel

31CrMoV9 is a nitriding steel which has at least 2.3%Cr,0.15%Mo,0.1%V as strengthening alloy elements. Due to its high wear resistance,it is mainly used in the automotive industry and general components mechanical engineering.30CrMoV9 is difficult to weld and therefore should not be used in weld constructions.It can attain surface hardness of 800 HV after nitriding.

Chemical Composition

31CrMoV9/1.85190.27-0.340.40-0.70≤ 0.025≤ 0.035≤ 0.40.1-0.22.3-2.70.15-0.25

Mechanical Properties

Diameter d mm16-4040-100100-160160-250
Yield Strength Mpa≥900≥800≥700≥650
Tensile Strength Mpa1100-13001000-1200900-1100850-1050
Elongation, %≥9≥10≥11≥12


Heat the temperature between 1050℃-1150℃,hold suitable time for the steel to be thoroughly heated.Reheat the steel once temperature  below 850°C. Crack is easily occured when improper cooling way after forged,so it  should be cooled as slowly as possible in the furnace or in sand after forged.

Heat Treatment

Heat Treatment ProcessTemperature RangeHolding TimeCooling MethodMaximum Hardness
Soft AnnealingHeat to 650-720℃N/ACool slowly in furnace248 HB
HardeningHarden from 870-930℃N/AOil/Polymer or Water QuenchingN/A
TemperingTempering temperature: 580-700℃N/AAir CoolingN/A
NitridingGas/Plasma Nitriding Temperature: 570-580℃ (Gas, Salt Bath) <br> Gas/Plasma Nitriding Temperature: 580℃ (Powder, Plasma)N/AN/ASurface Hardness after Nitriding: 800 HV


31CrMoV9 nitriding steel is used in mechanics automotive and general mechanics, which must be nitrided for very high wear forces, for example, gears, rods or axes.Structural parts of medium and large cross sections and high surface hardness, e.g., valve and gate valves, cylinders for combustion engines, superheated steam valves and fittings.


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