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AISI 4140H |
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| Category | Steel |
| Class | Alloy steel |
| Type | H-steel |
| Common Names | Chromium-molybdenum steel |
| Designations |
France: AFNOR 40 CD 4 , AFNOR 42 CD 4
Germany: DIN 1.7225
Italy: UNI 38 CrMo 4 KB , UNI 40 CrMo 4 , UNI G 4O CrMo 4
Japan: JIS SCM 4 , JIS SCM 4 H
Sweden: SS 2244
United Kingdom: B.S. 708 A 42 , B.S. 708 M 40 , B.S. 709 M 40
United States: ASTM A304 , SAE J1268 , UNS H41400
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| Composition |
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| Element | Weight % |
| C |
0.37-0.44 |
| Mn |
0.65-1.10 |
| Cr |
0.75-1.20 |
| Mo |
0.15-0.25 |
| P |
0.035 |
| S |
0.040 |
| Si |
0.15-0.30 |
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| Mechanical Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Density (×1000 kg/m3) |
7.7-8.03
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25 |
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| Poisson's Ratio |
0.27-0.30 |
25 |
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| Elastic Modulus (GPa) |
190-210
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25 |
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| Tensile Strength (Mpa) |
655 |
25 |
annealed at 815°C more |
| Yield Strength (Mpa) |
420 |
| Elongation (%) |
25.7 |
| Reduction in Area (%) |
57 |
| Hardness (HB) |
197 |
25 |
annealed at 815°C more |
| Thermal Properties |
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| Electric Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Electric Resistivity (10-9W-m) |
263 |
100 more |
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