The S460J2W High Strength Weathering Steel Plate, -20℃ Impact is a premium structural material compliant with EN 10025-5:2004, engineered for harsh environments demanding strength, extreme low temperature toughness, and natural corrosion resistance. With a minimum yield strength of 460MPa (for thickness ≤16mm), it delivers robust load-bearing capacity while excelling in cold climates, thanks to its "J2" designation-indicating impact resistance tested at -20℃ with a minimum KV2 value of 27J.
This steel's weathering performance stems from alloying elements like copper (0.25–0.55%), chromium, and nickel, which promote the formation of a dense, adherent rust layer (patina) that protects the substrate from further corrosion. Unlike standard steels, it reduces reliance on protective coatings in moderate to mildly corrosive atmospheres, lowering lifecycle maintenance costs. Mechanical properties remain consistent across thicknesses: yield strength decreases slightly to 440MPa (16–40mm) and 400MPa (63–80mm), while tensile strength ranges from 550–720MPa (thin plates) to 530–680MPa (thicker sections), with an elongation rate of ≥19% ensuring ductility.
The -20℃ impact resistance makes it ideal for structures exposed to freezing temperatures, such as northern-region bridges, railway carriages in cold climates, or offshore equipment subjected to thermal stress. Its weldability is supported by a balanced chemical composition, though proper procedures-including controlled heat input and preheating for thicker sections-are recommended to maintain heat-affected zone (HAZ) toughness.
Typical applications include cold-climate infrastructure (towers, industrial buildings), transportation (railway bridges, shipping containers), and coastal structures where salt-laden air and low temperatures accelerate corrosion in conventional steels. By combining high strength, extreme low temperature durability, and weathering resistance, S460J2W offers a cost-effective solution for long-life projects. Always consult the EN standard or suppliers for detailed technical specifications to ensure suitability for specific engineering requirements.
FAQ
Q: What is the key difference between S460J2W and S460J0W?
A: S460J2W has -20℃ impact resistance (KV2 ≥27J), while J0W is tested at 0℃.
Q: What standard does this steel follow?
A: It complies with EN 10025-5:2004 for hot-rolled weathering structural steels.
Q: What is its main corrosion resistance mechanism?
A: Alloy elements like copper and chromium form a protective rust layer, slowing substrate corrosion.
Q: At what thickness does the yield strength start to decrease?
A: Yield strength drops to 440MPa for 16–40mm thickness and 400MPa for 63–80mm.
Q: Where is S460J2W best used?
A: In cold-climate structures (bridges, towers, railway cars) and corrosive environments needing low-temperature toughness.
