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1.2888 tool steel x20CoCrWMo10-9
X20CoCrWMo10 - 9 steel bar is a high - performance alloy steel material that has found extensive applications in industries demanding high - temperature resistance, wear resistance, and excellent mechanical properties. Understanding its chemical composition is crucial for appreciating its unique performance characteristics.
Chemical composition%of the ladle analysis of grade1.2888
| Element | Content Range | Role in X20CoCrWMo10 - 9 Steel |
|---|---|---|
| Carbon (C) | 0.17 - 0.23% | Determines steel's strength and hardness; forms carbides to enhance wear resistance; content regulated to avoid excessive brittleness. |
| Cobalt (Co) | 9.5 - 10.5% | Improves high - temperature strength and stability; enhances red - hardness for maintaining hardness and strength at elevated temperatures, suitable for high - temperature applications like gas turbines and aerospace components. |
| Chromium (Cr) | 9 - 10% | Provides corrosion resistance by forming a passive oxide layer; contributes to hardenability for maintaining mechanical properties after heat treatment. |
| Tungsten (W) | 5 - 6% | Improves strength and wear resistance by forming hard carbides; positively impacts high - temperature strength for good performance under high - load and high - temperature conditions. |
| Molybdenum (Mo) | 1.8 - 2.2% | Improves hardenability; contributes to high - temperature strength and creep resistance; can dissolve in matrix or form carbides to enhance mechanical properties in high - temperature and high - stress applications. |
| Vanadium (V) | 0.1 - 0.5% | Forms hard and stable vanadium carbides to enhance wear resistance and strength; refines grain to improve toughness and fatigue resistance. |
| Silicon (Si) | 0.15 - 0.35% | Helps in deoxidizing during smelting; has a minor impact on strength and hardness. |
| Manganese (Mn) | 0.4 - 0.6% | Aids in deoxidation; improves hardenability and strength to some extent. |
| Phosphorus (P) | ≤ 0.03% | Kept at low levels as excessive amount can cause brittleness and reduce steel quality. |
| Sulfur (S) | ≤ 0.035% | Kept at low levels as excessive amount can cause brittleness and reduce steel quality. |
Mechanical properties of grade1.2888
| Proof strength Rp0.2(MPa) |
Tensile strength Rm(MPa) |
Impact energy KV(J) |
Elongation at fracture A(%) |
Reduction in cross section on fracture Z(%) |
As-Heat-Treated Condition | Brinell hardness(HBW) |
|---|---|---|---|---|---|---|
| 718(≥) | 868(≥) | 23 | 41 | 13 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 142 |
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