24 July 2021 Ball Bearing Steel Bar
G20CrMo Ball Bearing Steel Bar
G20CrMo is a bearing steel with high hardenability, no temper brittleness, and good weldability. This kind of steel has little tendency to form cold cracks, and has good machinability and cold strain plasticity.
Generally used in quenched and tempered or carburized and quenched state, it is used to manufacture high-pressure pipes and various fasteners that work in non-corrosive media and media containing nitrogen and hydrogen mixtures with a working temperature below 250 ℃, and higher-level infiltration Carbon parts, such as gears, shafts, etc.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Mo(％) | Cu(%) |
|---|---|---|---|---|---|---|---|---|
| 0.17-0.23 | 0.20-0.35 | 0.65-0.95 | 0.03 | 0.03 | 0.35-0.65 | — | 0.08-0.15 | Max 0.25 |
Mechanical Properties:
| Yield Strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 382 (≥) | 423 (≥) | 41 | 43 | 33 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 232 |
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν |
|---|---|---|---|---|---|---|---|
| 43 | - | - | 0.12 | - | |||
| 336 | 191 | - | 23.3 | 323 | - | ||
| 885 | - | 21 | 42.2 | 313 | 311 |