24 July 2021 Gear Steel Bar
SAE4140H Gear Steel Bar
SAE 4140H steel belongs to the ultra-high-strength steel, with high strength and toughness, hardenability is also good, no significant temper brittleness, after quenching and tempering have higher fatigue limit and anti-repeated impact ability, low temperature impact toughness . The steel suitable for the manufacture of a certain strength and toughness of large and medium-sized plastic mold. Equivalent to the Chinese standard 42CrMo steel.
Chemical Composition:
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu |
|---|---|---|---|---|---|---|---|---|
| 0.37~0.44 | 0.15~0.35 | 0.65~1.1 | ≤0.04 | ≤0.03 | 0.75~1.2 | ≤0.25 | 0.15~0.25 | ≤0.35 |
Mechanical Properties:
| Yield Strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Impact KV/Ku (J) | Elongation δ5 (%) | Reduction of Area ψ (%) | Impact Work Akv (J) | Hardness | Impact toughness value αkv (J/cm2) |
|---|---|---|---|---|---|---|---|
| ≥ 1080(110) | ≥ 930(95) | 12 | 12 | ≥45 | ≥63 | ≤217HB | ≥78(8) |
China Executive Standard GB / T 3077-1999
The corresponding International Organization for Standardization grades: 42CrMo4
Corresponding Japanese brands: SCM440
Corresponding to the German grade: 42crmo4 or 1.7225
Approximately corresponding to the US grade: 4140 or G41400