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SCM440 Chromium-Molybdenum Alloy Steel
SCM440 (4140) is a medium-carbon chromium-molybdenum alloy steel. It has a stable composition, high steel purity, a small decarburization layer, and stable quality and hardness after heat treatment. It is usually subjected to hardening and tempering processes and is widely used in manufacturing high-strength mechanical components, bearings, gears, etc.
The steel codes of different countries are as below：
● American AISI: 4140
● Japanese JIS: SCM440
● European Union EN: 42CrMoS4 / 42CrMo4
● German DIN: 42CrMo4
● Chinese GB: 42CrMo
● International Standard ISO: 42CrMo4
The steel codes of different countries are as below：
● American AISI: 4140
● Japanese JIS: SCM440
● European Union EN: 42CrMoS4 / 42CrMo4
● German DIN: 42CrMo4
● Chinese GB: 42CrMo
● International Standard ISO: 42CrMo4
| C% | Si% | Mn% | P% | S% | Cr% | Mo% | Ni% | Cu% |
|---|---|---|---|---|---|---|---|---|
| 0.38-0.43 | 0.15-0.35 | 0.6-0.85 | 0≦0.03 | 0≦0.03 | 0.9-1.2 | 0.15-0.3 | 0≦0.25 | 0≦0.3 |