Quick Details
1: 31CrMoV9 steel introduction
31CrMoV9 is the German DIN executive standard steel grade, which belongs to nitriding alloy structural steel this steel has high strength, good mechanical properties and intergranular corrosion resistance. It is generally used in quenched and tempered state or after high temperature tempering. After its surface is nitrided, its hardness can reach 1000 HV, it has excellent abrasion resistance and good anti-bite and anti-scratch ability.
2: 31CrMoV9 steel equivalent
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Country
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China
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Japan
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Germany
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USA
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Standard
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GB/T
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JIS
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DIN (W-Nr.)
EN 10085-2001
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AISI/ASTM
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Grade
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31CrMoV9
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3: 31CrMoV9 steel chemical composition
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Grade
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C
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Si
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Mn
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P
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S
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Cr
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Mo
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V
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Ni
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Cu
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31CrMoV9
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0.27-0.34
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0.04
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0.40-0.70
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0.025
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0.035
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2.30-2.70
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0.15-0.25
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0.10-0.20
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/
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/
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31Cr3MoV
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0.27-0.34
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0.17-0.37
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0.40-0.70
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0.03
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0.03
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2.30-0.70
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0.15-0.25
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0.10-0.20
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0.03
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0.03
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4: 31CrMoV9 steel mechanical properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
5: 31CrMoV9 steel overviews
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Size
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Round
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Dia 6-1200mm
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Plate/Flat/Block
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Thickness
6mm-500mm
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Width
20mm-1000mm
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Heat treatment
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Normalized ; Annealed ; Quenched ; Tempered
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Surface condition
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Black; Peeled; Polished; Machined; Grinded; Turned; Milled
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Delivery condition
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Forged; Hot rolled; Cold drawn
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Test
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Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc.
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Payment terms
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T/T;L/C;/Money gram/ Paypal
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Trade terms
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FOB; CIF; C&F; etc..
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Delivery time
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30-45 days
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Application
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31CrMoV9 is suitable for medium and large section components requiring high tensile strength and good toughness, and generally does not bear heavy loads. Commonly used in the manufacture of gear and engine construction components, such as hydraulic pistons, hydraulic piston rods, connecting shafts, connecting rods, knuckles, ring gear, screws and bolts, etc.
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6: Heat Treatment
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.
7: Delivery condition
For hot forged bar, usually the delivery condition is hot forged, annealed/QT, rough turned/Black surface.
For hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
For hot forged block, usually the delivery condition is hot forged, annealed/QT, milled surface/Black surface
For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.
For cold drawn bar, usually the delivery condition is cold drawn, annealed/QT, peeled/black surface
