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Metal Alloys |
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Alloy Home |
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Steels |
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Tool Steels |
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General Information |
| Properties | |
| Tool Steel Types |
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High-Speed |
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Hot-Work |
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Cold-Work |
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Shock-Resistant |
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Mold |
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Special-Purpose |
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Water-Hardening |
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Tool Steel List |
| AISI Ax | |
| AISI Dx | |
| AISI Hx | |
| AISI Lx | |
| AISI Mx | |
| AISI Ox | |
| AISI Px | |
| AISI Sx | |
| AISI Tx | |
| AISI Wx | |
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Specific Tool Steel |
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General Information |
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Resources |
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Bibliography |
| AISI P21 | |
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| Category | Steel |
| Class | Tool steel |
| Type | General mold steel |
| Designations | United States: ASTM A681 , UNS T51621 |
| Composition | |
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| Element | Weight % |
| C | 0.18-0.22 |
| Mn | 0.20-0.40 |
| Si | 0.20-0.40 |
| Cr | 0.20-0.30 |
| Ni | 3.90-4.25 |
| V | 0.15-0.25 |
| Cu | 0.25 |
| P | 0.03 |
| S | 0.03 |
| Al | 1.05-1.25 |
| Mechanical Properties | |
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