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AISI S7 |
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| Category | Steel |
| Class | Tool steel |
| Type | Shock-resisting steel |
| Designations |
United States: ASTM A681 , UNS T41907
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| Composition |
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| Element | Weight % |
| C |
0.45-0.55 |
| Mn |
0.20-0.80 |
| Si |
0.20-1.00 |
| Cr |
3.00-3.50 |
| Mo |
1.30-1.80 |
| V |
0.20-0.30(a) |
| Cu |
0.25 |
| P |
0.03 |
| S |
0.03 |
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| Mechanical Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Density (×1000 kg/m3) |
7.76 |
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) |
640 |
25 |
annealed more |
| Yield Strength (Mpa) |
380 |
| Elongation (%) |
25 |
| Reduction in Area (%) |
55 |
| Hardness (HRB) |
95 |
25 |
annealed more |
Impact Strength (J)
(Charpy unnotched) |
244 |
25 |
fan cooled from 940°C, single tempered at 205°C more |
| Thermal Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Thermal Expansion (10-6/ºC) |
12.6 |
20-200 more |
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