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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
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
V |
|
0.27-0.34 |
max0.4 |
0.4-0.7 |
max 0.025 |
max0.035 |
2.3-2.7 |
0.15-0.25 |
0.1-0.2 |
Mechanical Property
|
Diameter (mm) |
16-40 |
40-100 |
100-160 |
160-250 |
|
Yiled
Strength |
≥900 |
≥800 |
≥700 |
≥650 |
|
Tensile
Strength |
1100-1300 |
1000-1200 |
900-1100 |
850-1050 |
|
Elongation(%) |
≥9 |
≥10 |
≥11 |
≥12 |
|
Impact(J) |
≥25 |
≥30 |
≥35 |
≥40 |
|
Hardness（HB) |
331-380 |
298-359 |
271-331 |
253-319 |
Applications
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.
Hardening
Harden from a temperature of 870-930℃, followed by oil/polymer or water quenching.
Tempering
Tempering temperature: 580-700℃.
Nitriding
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.
