1. Definition & Standard
HP265 is a hot-rolled, acid-pickled steel sheet primarily used in structural and automotive applications. It aligns with European standard EN 10028-2 (for pressure vessel steel) and corresponds to P265GH in international nomenclature . The designation "HP" may indicate Hot Rolled Pickled or a manufacturer-specific code, while "265" refers to its minimum yield strength of 265 MPa at room temperature .
2. Key Characteristics
Chemical Composition:
Carbon (C): ≤0.20% (ensures weldability) .
Manganese (Mn): 0.80–1.40% (enhances strength and hardenability) .
Low impurities: Phosphorus (P) ≤0.025%, Sulfur (S) ≤0.010% (improves toughness) .
Aluminum (Al) ≥0.020% (refines grain structure) .
Mechanical Properties:
Yield Strength: ≥265 MPa (room temperature) .
Tensile Strength: 410–530 MPa .
Elongation: ≥22% (excellent ductility) .
Impact Toughness: ≥27 J at -20°C (suitable for low-temperature environment) .
3. Manufacturing Process
Hot Rolling: Produced at 1,000–1,400°C for shape and strength .
Acid Pickling: Removes surface oxides, improving surface quality
Heat Treatment: Typically delivered in normalized (N) or normalized-rolled (NR) states to optimize mechanical properties .
4. Applications
HP265 is widely used in:
Automotive Industry: Structural components (e.g., chassis, wheel rims) due to high formability .
Pressure Vessels: Boilers, reactors, and storage tanks requiring high-pressure resistance .
Industrial Machinery: Compressor shells, heat exchangers, and hydraulic systems .
Energy Sector: Power plant equipment and nuclear reactor components .
5. Advantages
Weldability: Low carbon content minimizes cracking risks .
High-Temperature Stability: Maintains ≥185 MPa yield strength at 350°C .
Cost-Effectiveness: Balances performance and affordability compared to specialty alloys .
6. Quality Considerations
Surface defects like inclusions (e.g., Al₂O₃ clusters) can cause localized thinning during stamping, requiring strict quality control .
Compliance with EN 10204 3.1 certification ensures traceability and material integrity .
Summary Table
| Aspect | Details |
|---|---|
| Standard | EN 10028-2 / Equivalent to P265GH |
| Yield Strength | ≥265 MPa (room temperature) |
| Key Applications | Automotive structures, pressure vessels, industrial machinery |
| Heat Treatment | Normalized or normalized-rolled |
| Market Price | ~$650–850/ton (varies with thickness and supplier) |
HP265 combines strength, versatility, and cost efficiency, making it a cornerstone material for demanding engineering applications.
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