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sncm430 JIS G4053 alloy steel
Chemical Composition
| Element | Content Range (%) | Role and Explanation |
|---|---|---|
| Carbon (C) | 0.28–0.33 | Increases the steel's strength and hardness by forming carbides in the matrix. |
| Silicon (Si) | 0.15–0.35 | Contributes to strength and acts as a deoxidizer during steel production to improve purity. |
| Manganese (Mn) | 0.60–0.90 | Enhances hardenability, strength, and toughness by solid solution strengthening and grain refinement. |
| Phosphorus (P) | ≤0.030 | Harmful element; low content prevents embrittlement and maintains ductility. |
| Sulfur (S) | ≤0.030 | Harmful element; low content reduces the formation of brittle sulfides and improves forgeability. |
| Chromium (Cr) | 0.90–1.20 | Improves hardenability, wear resistance, and corrosion resistance by forming stable carbides. |
| Nickel (Ni) | ≤0.25 | Improves toughness and corrosion resistance (residual content limit); enhances ductility at low temperatures. |
| Copper (Cu) | ≤0.30 | Residual element; controlled to prevent embrittlement and maintain mechanical properties. |
| Molybdenum (Mo) | 0.15–0.30 | Enhances hardenability, high-temperature strength, and wear resistance; inhibits temper brittleness. |
Mechanical Properties
| Property | Value | Unit | Description |
|---|---|---|---|
| Tensile Strength (σb) | ≥930 (≥95) | MPa (kgf/mm²) | Maximum stress before fracture; reflects resistance to tensile loading. |
| Yield Strength (σs) | ≥785 (≥80) | MPa (kgf/mm²) | Stress at which plastic deformation begins. |
| Elongation (δ5) | ≥12 | % | Plastic deformation capacity before fracture; indicates ductility. |
| Reduction of Area (ψ) | ≥50 | % | Plastic deformation capacity under compression; measures cross-sectional shrinkage. |
| Impact Energy (Aku) | ≥63 | J | Energy absorbed during impact; reflects toughness and resistance to sudden loading. |
| Impact Toughness (αkv) | ≥78 (≥8) | J/cm² (kgf·m/cm²) | Specific energy absorption; indicates resistance to brittle fracture. |
| Hardness (as-supplied) | ≤229 | HB | Initial hardness; can be increased via heat treatment. |
heat treatment parameters of SNCM430 alloy steel
| Heat Treatment | Parameters | Cooling Medium | Purpose |
|---|---|---|---|
| Quenching | 880°C | Water or oil | Increase hardness and strength by forming martensite. |
| Tempering | 540°C | Water or oil | Relieve internal stresses from quenching, improve toughness, and balance mechanical properties. |
Notes:
Values in parentheses are converted units for reference (1 kgf/mm² ≈ 9.80665 MPa).
Heat treatment parameters may vary based on part geometry, section thickness, and specific application requirements.
Post-heat treatment hardness can be tailored (e.g., 30-40 HRC) through controlled quenching and tempering processes.
Applications
| Industry | Application | Key Reason |
|---|---|---|
| Chemical Industry | Manufacture of welded parts and structural components (plates, pipes). | Good weldability and mechanical properties ensure reliable performance in welded structures. |
| Steam Turbine & Boiler Manufacturing | Fasteners operating below 450°C, high-pressure flanges/nuts (≤500°C), and conduits. | Sufficient high-temperature strength and stability to withstand thermal and mechanical loads. |
| Automobile & Machinery Industries | Gears, axles, and structural components requiring high tensile strength and durability. |
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