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Detailed Comparative Analysis: Low-Alloy High-Strength Steel Plates S355J0 vs. S355J2
S355J0 steel plate and S355J2 steel plate are common European standard (EN 10025-2) low-alloy high-strength structural steels, widely used in construction, bridges, and machinery. While similar in many aspects, they exhibit key differences in chemical composition, mechanical properties, low-temperature toughness, and manufacturing processes. Below is a comprehensive comparison across multiple dimensions.
Products Description
1. Standard & Designation
| Parameter | S355J0 | S355J2 |
|---|---|---|
| Standard | EN 10025-2 | EN 10025-2 |
| Grade Breakdown | S355 (Yield ≥355 MPa) J (Longitudinal impact) 0 (Tested at 0°C) |
S355 (Yield ≥355 MPa) J (Longitudinal impact) 2 (Tested at -20°C) |
| Primary Use | Structures in 0°C and above | Structures in -20°C environments |
Mechanical Properties
| Property | S355J0 | S355J2 | Difference |
|---|---|---|---|
| Yield Strength (ReH) | ≥355 MPa | ≥355 MPa | Same |
| Tensile Strength (Rm) | 470–630 MPa | 470–630 MPa | Same |
| Elongation (A) | ≥22% (thickness ≤16mm) | ≥22% (thickness ≤16mm) | Same |
| Impact Test Temp. | 0°C | -20°C | Core difference |
| Impact Energy (KV) | ≥27J (longitudinal) | ≥27J (longitudinal) | Same energy, different test temps |
Key Notes:
Impact toughness temperature is the primary distinction:
S355J0: Suitable for environments ≥0°C (e.g., temperate climates).
S355J2: Designed for -20°C (e.g., cold regions, offshore structures).
Selection Guidelines
Choose S355J0 if:
Operating temperatures remain above 0°C.
Cost optimization is a priority (J0 is slightly cheaper than J2).
Choose S355J2 if:
The structure will face -20°C or dynamic loads (e.g., wind turbines, bridges).
High weld integrity is critical.
Additional Recommendations:
For thick plates (>40mm), normalized S355J2 is preferred to avoid toughness loss.
Always verify Mill Test Certificates (MTCs) to confirm impact test compliance.
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