1. Main Grades & Executive Standards

GB: Q355ND, Q355NE, Q460ND, Q460NE, Q550D, Q690D/E; EN: S355NL, S460NL, S690QL; ASTM: A572 Gr.50/60, A633D/E

2. Typical Mechanical Properties

- Q355ND: Yield Strength ≥355MPa, Tensile Strength 470-630MPa, Elongation ≥21%, Charpy V-Notch Impact Energy ≥34J at -40°C

- Q355NE: Yield Strength ≥355MPa, Tensile Strength 470-630MPa, Elongation ≥21%, Charpy V-Notch Impact Energy ≥34J at -50°C

- Q460ND: Yield Strength ≥460MPa, Tensile Strength 570-720MPa, Elongation ≥17%, Charpy V-Notch Impact Energy ≥34J at -40°C

- Q690D: Yield Strength ≥690MPa, Tensile Strength 770-940MPa, Elongation ≥14%, Charpy V-Notch Impact Energy ≥27J at -40°C

- S355NL: Yield Strength ≥355MPa, Tensile Strength 470-630MPa, Elongation ≥22%, Charpy V-Notch Impact Energy ≥27J at -50°C

3. Chemical Composition (Max Mass Fraction, %)

C≤0.20, Si≤0.60, Mn≤1.80, P≤0.025, S≤0.015, with trace microalloying elements for grain refinement and low-temperature toughness improvement.

4. Size Range

Thickness: 4mm-120mm; Width: 1500mm-4200mm; Length: 3000mm-12000mm; customized size cutting and processing are available according to customer requirements.

5. Delivery Condition & Quality Assurance

Delivery Condition: Thermo-Mechanically Controlled Process (TMCP), Normalized (N), Quenched and Tempered (Q&T)

Surface Treatment: Mill surface, shot blasted, anti-rust primed

Quality Control: Full dimensional inspection, ultrasonic testing (UT) available, complete mill test certificates (MTC) provided, with full quality and performance traceability.