40Cr Steel Plate
AISI 5140 Steel Round Bar
40Cr Steel Round Bar
5140 Steel Round Bar
Songshun Steel Plate Storehouse
forged steel
Steel Furnace
wooden box packaging
Steel Wooden Box Packaging
Round Steel Packaging
40Cr Steel Plate
AISI 5140 Steel Round Bar
40Cr Steel Round Bar
5140 Steel Round Bar
Songshun Steel Plate Storehouse
forged steel
Steel Furnace
wooden box packaging
Steel Wooden Box Packaging
Round Steel Packaging

40Cr Steel Material Sheet Plate Round Bar

40Cr steel material widely be used in the machine-building industry. 40Cr is a standard grade of GB. After quenching and tempering, it will get great comprehensive mechanical property and great low-temperature impact toughness. And its hardenability is good. After the oil quenching, the fatigue limit will be higher. But the fittings with complex shape is easy to get crack after the water quenching. It is also suitable for cyaniding and high-frequency quenching beside Q+T. Its machinability also is good, if the hardness is 174-229 HB, the machinability is 60%. 40Cr steel material is a good choice for medium type plastic mold. It belongs to mild Q+T steel and cold heading mold steel. Also, the price is not high, easy to be processed. After the right heat treatment, it will get good toughness, plasticity and wear resistance. Tempering at the range of 550-570℃, it will get the best mechanical property. The equivalent steel grade of 40Cr is 40MnB, 45 MnB, 35SiMn, 42SiMn, 40MnVB, 42MnV, 40MnMoB, 40MnWB and etc.

40Cr Steel Round Bar Sheet Plate Supply Range
TypeSpecificationSurface
Round BarDiameter:5-3000mm; Length: Can be customized
Other specifications can be customized.
Black Surface/Bright Surface /Grinded/Peeled/Turned
Sheet/Plate/SlabThickness: Max 3000mm; width: Can be customized;
Length: Can be customized
Other specifications can be customized.
Black Surface/Bright Surface /Grinded/Peeled/Turned

40Cr Steel Grade Equivalent Chart

CountryCHINAUSAGermanyFranceJAPANISO
StandardGBASTM/AISIUNSDIN EN/DINW-Nr.NF EN/NFJISISO
Grades40Cr5140G51400 41Cr41.703542C4SCr440/SCr440H 41Cr4

40Cr Steel Chemical Composition

GradeC(%)Si(%)Mn(%)Cr(%)P(%)S(%)Cu(%)Ni(%)Mo(%)
40Cr0.37-0.440.17-0.370.50-0.800.80-1.10MAX 0.035MAX 0.035MAX 0.30MAX 0.30MAX 0.15

GB 40Cr Steel Physical Properties

Physical Properties
Temperature(℃)43678825
Modulus of elasticity(GPa) -243-
Thermal conductivity(W/m.°C)-33.313.2
Specific thermal capacity(J/kg.°C)-243-
Density(kg/dm³)--132

40Cr Steel Mechanical Properties

Mechanical Properties
Tensile Strength≥ 810 MPa
Yield Point ≥ 785 MPa
Impact Absorbing Energy≥ 47 J
Elongation After Break≥9%
Rate of reduction in area≥45%

40Cr Steel Application

What is 40Cr Steel Material Used for?
It is one of the most popular steel grades in the industry. After Q+T heat treatment, it usually is used to make parts. Such as the gears of machine tools, shaft, worm, spline shaft and etc. If it is through quenching and tempering; high-frequency quenching, it will be good choice for fittings with high hardness and wear resistance. For example, wheel gear, shaft, principal axis, crankshaft, arbor, inlet valve, bolt and etc.

1.7035 40Cr Steel Heat Treatment

Q+T Hardness
After quenching and tempering, the hardness of 40Cr is in the range of 32-36HRC, which means about 301-340 HB.

830℃-860℃ oil quenching: 55HRC
150℃ tempering: 55HRC
200℃ tempering: 53HRC
300℃ tempering: 51HRC
400℃ tempering: 43HRC
500℃ tempering: 34HRC
550℃ tempering: 32HRC
600℃ tempering: 28HRC
650℃ tempering: 24HRC
700℃ tempering: 20HRC

40Cr Steel vs 45# Steel

The carbon content of 40Cr is lower than 45# steel. At the condition of hot-rolled, their mechanical property is almost the same. But the price of 40Cr is higher than 45# steel about a half. So if your budget is not high, you maybe need to choose the 45# steel.

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