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AISI S1 |
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| Category | Steel |
| Class | Tool steel |
| Type | Shock-resisting steel |
| Designations |
France: AFNOR 55 WC 20
Germany: DIN 1.2550
Italy: UNI 58 WCr 9 KU
United States: ASTM A681 , FED QQ-T-570 , SAE J438 , UNS T41901
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| Composition |
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| Element | Weight % |
| C |
0.40-0.55 |
| Mn |
0.10-0.40 |
| Si |
0.15-1.20 |
| Cr |
1.00-1.80 |
| Ni |
0.30 |
| Mo |
0.50 |
| W |
1.50-3.00 |
| V |
0.15-0.30 |
| 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) |
7.88 |
25 |
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| Poisson's Ratio |
0.27-0.30 |
25 |
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| Elastic Modulus (GPa) |
190-210
|
25 |
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| Tensile Strength (Mpa) |
690 |
25 |
annealed more |
| Yield Strength (Mpa) |
415 |
| Elongation (%) |
24 |
| Reduction in Area (%) |
52 |
| Hardness (HRB) |
96 |
25 |
annealed more |
Impact Strength (J)
(Charpy unnotched) |
249 |
25 |
oil quenched from 930°C, single tempered at 205°C more |
| Thermal Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Thermal Expansion (10-6/ºC) |
12.4 |
20-100 more |
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