AISI 4140
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AISI 4140
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Chemical Composition
| Element | Alloy Steel |
|---|---|
| Chromium Molybdenum SteelA | |
| CompositionB, % | |
| Carbon | 0.37 - 0.49C |
| Manganese | 0.65 - 1.10 |
| Phosphorus | 0.035 max |
| Sulfur | 0.040 max |
| Silicon | 0.15 - 0.35 |
| Chromium | 0.75 - 1.20 |
| Molybdenum | 0.15 - 0.25 |
B: The intentional addition of Bi, Se, Te, and Pb is not permitted.
C: For bar sizes over 31⁄2 in. [90 mm], inclusive, the carbon content may be 0.50 %, max.
Mechanical Properties
| Diameter, inch. | Tensile Strength, min, ksi |
Yield Strength, min, 0.2% offset, ksi |
Elongation in 4D, min, % |
Reduction of Area, min, % |
Hardness, max |
|---|---|---|---|---|---|
| 2-1⁄2 and under | 125 | 105 | 16 | 50 | 321 HBW or 35 HRC |
| over 2-1⁄2 to 4, inclusive | 115 | 95 | 16 | 50 | 321 HBW or 35 HRC |
| over 4 to 7, inclusive | 100 | 75 | 18 | 50 | 321 HBW or 35 HRC |
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