AISI 4140 Composition, Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C )
| C (carbon) | 0.38 | – | 0.43 | % |
| Cr (chromium) | 0.8 | – | 1.1 | % |
| Fe (iron) | 96.8 | – | 97.8 | % |
| Mn (manganese) | 0.75 | – | 1 | % |
| Mo (molybdenum) | 0.15 | – | 0.25 | % |
| P (phosphorus) | 0 | – | 0.035 | % |
| S (sulfur) | 0 | – | 0.04 | % |
| Si (silicon) | 0.15 | – | 0.35 | % |
| AISI 4140 Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C ) | |
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| UNS number | G41400 |
| US name | SAE H41400, SAE 4140, SAE 4142, SAE 4140, ASTM J 70, ASTM J 65, ASTM J 55, ASTM 4140, ASTM G41420, ASTM E7140, ASTM B7M, ASTM B16, ASTM 4142H, ASTM 4142, ASTM 4140H, ASTM 4140, ASTM 4137H, ASTM 41, ~SAE 4137H, ~ASTM B4D, ~ASTM 6 |
| EN name | ~42CrMoS4, ~42CrMo4 |
| EN number | ~1.7227, ~1.7223 |
| ISO name | ~ 42 CrMoS 4, ~ 42 CrMo 4, ~42CrMo4 |
| GB (Chinese) name | ~42CrMo |
| JIS (Japanese) name | SNB22-5, SNB22-4, SNB22-3, SNB22-2 |
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