P265GH vs S235JR
Chemical Composition Comparison
| Element | P265GH (EN 10028-2) | S235JR (EN 10025-2) | Key Differences |
|---|---|---|---|
| Carbon (C) | ≤ 0.20% | ≤ 0.17% (for thickness ≤ 40mm) | S235JR has a lower maximum carbon content for improved weldability and ductility in structural applications. |
| Silicon (Si) | ≤ 0.40% | Usually ≤ 0.50% (not always specified) | P265GH has stricter silicon limits; S235JR may have slightly higher silicon for deoxidation. |
| Manganese (Mn) | 0.80–1.40% | 1.00–1.50% (for thickness ≤ 40mm) | S235JR typically has higher manganese to enhance strength and hardenability in structural uses. |
| Phosphorus (P) | ≤ 0.025% | ≤ 0.035% | P265GH has stricter phosphorus control for better toughness in pressure vessels. |
| Sulfur (S) | ≤ 0.015% | ≤ 0.045% (common grade) | P265GH has much lower sulfur for improved cleanliness and pressure resistance; S235JR allows higher sulfur for general fabrication. |
| Other Elements | May contain trace Nb, V, Ti | Usually plain carbon-manganese steel | P265GH may have microalloying for pressure retention; S235JR is simple structural steel. |
Mechanical Properties Comparison
| Property | P265GH (EN 10028-2) | S235JR (EN 10025-2) | Key Differences |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 265 MPa (for thickness ≤ 16mm) | ≥ 235 MPa (for thickness ≤ 16mm) | P265GH has a significantly higher yield strength, making it suitable for pressure containment. |
| Tensile Strength (Rm) | 410–530 MPa | 360–510 MPa | P265GH has a higher minimum tensile strength for pressure vessel integrity. |
| Elongation (A5) | ≥ 22% (for thickness ≤ 16mm) | ≥ 21% (for thickness ≤ 16mm; longitudinal) | Similar elongation, but P265GH may have slightly better ductility for pressure applications. |
| Impact Toughness | ≥ 27 J at 0°C or 20°C (as specified) | Not typically required (unless specified as S235J0/J2/K2) | P265GH mandates impact toughness for safety in pressure systems; S235JR only requires it for specific sub-grades. |
Physical (Mechanical-Related) Properties & Application Comparison
| Property/Application | P265GH | S235JR | Key Differences |
|---|---|---|---|
| Heat Treatment | Usually supplied normalized (N) or normalized rolled | Usually supplied in hot-rolled condition | P265GH often requires normalization for pressure integrity; S235JR is typically hot-rolled for cost-effectiveness. |
| Intended Use | Pressure vessels, boilers, and piping systems | General structural applications (buildings, bridges, machinery frames) | P265GH is for pressure-containing equipment; S235JR is for load-bearing structures. |
| Weldability | Good, but requires careful procedures for pressure systems | Excellent, with simple welding techniques | S235JR is easier and more economical to weld; P265GH needs controlled welding to maintain pressure integrity. |
| High-Temperature Performance | Suitable for moderate temperatures (up to ~400°C) | Not designed for high-temperature service | P265GH retains strength at elevated temperatures; S235JR may degrade rapidly above 300°C. |
| Standard Reference | EN 10028-2 (pressure vessel steel) | EN 10025-2 (structural steel) | Different standards with distinct requirements based on application. |
P265GH high temperature pipe factory
