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 | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Specification | Surface | |||||||||||||||||
| Round Bar | Diameter:5-3000mm; Length: Can be customized Other specifications can be customized. | Black Surface/Bright Surface /Grinded/Peeled/Turned | |||||||||||||||||
| Sheet/Plate/Slab | Thickness: 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
| Country | CHINA | USA | Germany | France | JAPAN | ISO | ||
|---|---|---|---|---|---|---|---|---|
| Standard | GB | ASTM/AISI | UNS | DIN EN/DIN | W-Nr. | NF EN/NF | JIS | ISO |
| Grades | 40Cr | 5140 | G51400 | 41Cr4 | 1.7035 | 42C4 | SCr440/SCr440H | 41Cr4 |
40Cr Steel Chemical Composition
| Grade | C(%) | Si(%) | Mn(%) | Cr(%) | P(%) | S(%) | Cu(%) | Ni(%) | Mo(%) |
|---|---|---|---|---|---|---|---|---|---|
| 40Cr | 0.37-0.44 | 0.17-0.37 | 0.50-0.80 | 0.80-1.10 | MAX 0.035 | MAX 0.035 | MAX 0.30 | MAX 0.30 | MAX 0.15 |
GB 40Cr Steel Physical Properties
| Physical Properties | |||
|---|---|---|---|
| Temperature(℃) | 43 | 678 | 825 |
| Modulus of elasticity(GPa) | - | 243 | - |
| Thermal conductivity(W/m.°C) | - | 33.3 | 13.2 |
| 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% |
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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.
Our Advantage
Manufacturing
With 7000 tons of hydraulic forging press, electric slag furnace and other high-end production equipment, we produce a great variety of steels with the best quality in China.
Testing
In order to control the quality, we have complete testing methods to make sure satisfy the customer needs, including Chemical Analysis, Ultrasonic Test and so on.
Massive Stock
We keep a mass stock are over 20000 tons for various steel type, including steel round bar, steel sheet, alloy steel, carbon steel, stainless steel, mold steel, steel coil and etc.
Customized Service
With a professional steel engineers team, we provide customized service according to your project drawing, also provide professional project experience for your special project, such as materials, processing conditions and etc.
World Wide Delivery
For container shipment, standard packing and bundle round bar and flat bar would be applied. It is necessary to fasten & reinforcement would be done to ensure the safety and better unloading at the destination port.
For less than container shipment, wooden box package would be applied for different size materials. For milled or grounded materials, the anti-rust oil would be needed to ensure the surface condition, within the wooden box.
