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AISI 81B45 |
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| Category | Steel |
| Class | Alloy steel |
| Type | Standard |
| Common Names | Boron steel |
| Designations |
United States: ASTM A322 , ASTM A519 , SAE J404 , SAE J412 , SAE J770 , UNS G81451
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| Composition |
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| Element | Weight % |
| C |
0.43-0.48 |
| Mn |
0.75-1.00 |
| P |
0.035 (max) |
| S |
0.04 (max) |
| Si |
0.15-0.30 |
| Cr |
0.35-0.55 |
| Ni |
0.20-0.40 |
| Mo |
0.08-0.15 |
| B |
0.0005-0.003 |
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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) |
2034 |
25 |
oil quenched, fine grained, tempered at 205°C more |
| Yield Strength (Mpa) |
1724 |
| Elongation (%) |
10 |
| Reduction in Area (%) |
33 |
| Hardness (HB) |
550 |
25 |
oil quenched, fine grained, tempered at 205°C more |
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