40Cr Round Bar Stock Steel
40Cr round steel bar is the standard steel number of China GB, 40Cr steel is one of the widely used steel in the machinery manufacturing industry. Tempering treatment has good overall mechanical properties, good low-temperature impact toughness and low notch. Steel hardenability is good, water quenching can be quenched to Ф28 ~ 60mm, oil quenching can be quenched to Ф15 ~ 40mm. this steel in addition to tempering treatment is also suitable for cyanide and high frequency quenching treatment. Cutting performance is good, when the hardness of 174 ~ 229HB, relative cutting and machining for 60%. The steel is suitable for making medium-sized plastic moulds.
40Cr round steel rod 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 |
40Cr steel rod bar mechanical property
| 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 round metal stock 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 round metal rod Nitriding
40Cr solid round bar steel belongs to the nitridable steel, the elements contained in it are conducive to nitriding. 40Cr round steel can obtain high surface hardness after nitriding treatment, 40Cr round bar tempered nitriding treatment hardness * can reach 72~78HRA, heart hardness reaches 43~55HRC.
Nitriding workpiece process route: forging - annealing - rough machining - tempering - finishing - stress relief - rough grinding - nitriding - fine grinding or grinding. Due to the nitrided layer is thin and brittle, so it is required to have high strength of the heart organisation, so it is necessary to carry out tempering heat treatment first to get tempered Sohnite to improve the mechanical properties of the heart and the quality of the nitrided layer.
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We have enough 40Cr Round Bar Stock Steel in stock, and we can also customize it according to your needs.
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