1.8519 31CrMoV9 Nitriding Steel

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Heat Treatment
Cold Processing
Hot Working

Grade :31CrMoV9


Classification:Nitriding steel


EN 10085: 2001 Nitriding steel. Technical delivery conditions

Our supply size :

Diameter : 80 to 600 mm ;

Length : 1000 to 9000 mm ;

Our advantage :

  1. High Quality, Reasonable Price
  2. Over 40 Years Experience
  3. ISO NQA Certificated Factory
  4. Worldwide shipping
  5. Emergency Orders and Fast Delivery

Chemical composition % of steel 31CrMoV9 (1.8519):

0.27 – 0.34max0.40.4 – 0.7max 0.025Max 0.0352.3 – 2.70.15 – 0.250.1 – 0.2

Mechanical Property

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


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.


With its high wear resistance 1.8519 steel is used widely in the engineering and automotive industries. Suitable for components with medium and large cross sections which require high tensile strength and good toughness. Typically used for in gear and engine construction for components such as crankshafts, connecting rods, steering knuckles, screws and bolts.

Heat Treatment

Soft Annealing

Heat to 650-720℃, cool slowly in the furnace. This will produce a maximum Brinell hardness of 248.


Harden from a temperature of 870-930℃, followed by oil/polymer or water quenching.


Tempering temperature: 580-700℃.


Gas/plasma nitriding temperature (gas, salt bath): 570-580℃

Gas/plasma nitriding temperature (powder, plasma): 580℃

Surface hardness after nitriding: 800 HV

Forming Option

1 Hot rolling process

2 Hot Forging: Electro-hydraulic; High-speed-hydraulic; Oil-hydraulic; Precision-forging

Heat-treatment Option

1 +A: Annealed (full/soft/spheroidizing)

2 +N: Normalized

3 +NT: Normalized and tempered

4 +QT: Quenched and tempered (water/oil)

Surface Option

1 Black Surface

2 Grounded: Bright but rough ; Not precision

3 Machining for plate: Bright and precision; Little turning scar

4 Peeled/Turned: Bright and precision; Little turning scar

5 Polished: Very Bright and precision size; Not turning scar

Other Services

1 Cutting: Small pieces

2 CNC Machine: Produce as your drawing

3 Package: Bare/Nylon/Canvas/Wooden

4 Payment:T/T, L/C, O/A(request credit)

5 Transport:FOB/CFR/CIF/DDU/DDP (train/ship/Air)

Mill test certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.