What Is EN 10025-5 S355J2WP Steel Plate?
EN standard S355J2WP corten weathering steel plate is a kind of atmospheric corrosion resistant hot-rolled steel. The main alloying elements of S355J2WP steel are chromium, nickel, and copper, with added phosphorus, which gives it excellent self-protecting qualities. As S355J2WP steel reacts with elements in the atmosphere, the material forms a layer of rust over time which in essence protects the steel from further corrosion. The grade is widely used for architecture, smokestacks, sculpture, trains, containers, and bridges.
Standard and Steel Category
S355J2WP is delivered in accordance with EN 10025-5, the European standard for hot-rolled products of structural steels with improved atmospheric corrosion resistance. The earlier standard EN 10155, which also covered structural steels with improved atmospheric corrosion resistance, has been superseded by EN 10025-5 in current European practice. The grade belongs to the weathering steel family, best known under the trademark COR-TEN, a family of weathering steel grades developed to obviate the need for painting and to form a stable rust-like appearance when exposed to the weather.
Chemical Composition
The chemical composition of S355J2WP is: carbon up to 0.12 percent, manganese up to 1.00 percent, silicon up to 0.75 percent, phosphorus in the range 0.06-0.15 percent, sulfur up to 0.030 percent, chromium 0.30-1.25 percent, and copper 0.25-0.55 percent. The elevated phosphorus content is characteristic of the P grades and works together with chromium and copper to accelerate the formation of a uniform, protective rust layer.
Mechanical Properties
S355J2WP is specified with a tensile strength of 510-680 MPa, a minimum yield strength of 345 MPa, and a minimum elongation of 20 percent measured on a 50 mm gauge, with Charpy impact testing at -20 degrees Celsius. The combination of high strength and low-temperature toughness makes the grade suitable for load-bearing structures in outdoor and industrial environments.
Specification and Equivalents
Typical supply specifications include thickness up to 150 mm and width up to 4100 mm, with length customized as required, and delivery states such as hot rolled, normalized, as-rolled, and thermo-mechanically rolled. Commonly cited equivalents include ASTM A242 Type 1, E36WA4, and the older European designations Fe510D1KI and Fe510D1K1. Because equivalence depends on the governing standard edition and delivery conditions, it should be confirmed before substitution.
Frequently Asked Questions
What does S355J2WP stand for?? S denotes structural steel, 355 is the minimum yield strength in MPa, J2 means Charpy impact testing at -20 degrees Celsius, W means weathering steel, and P indicates a higher phosphorus content for enhanced weathering.
What are the mechanical properties of S355J2WP?? Tensile strength of 510-680 MPa, minimum yield strength of 345 MPa, minimum elongation of 20 percent measured on a 50 mm gauge, and Charpy impact testing at -20 degrees Celsius.
Why is phosphorus added to this grade?? The elevated phosphorus content of 0.06-0.15 percent is characteristic of the P grades and works with chromium and copper to accelerate the formation of a uniform, protective rust layer.
What equivalents are commonly cited for S355J2WP?? ASTM A242 Type 1, E36WA4, and the older European designations Fe510D1KI and Fe510D1K1. Because equivalence depends on the governing standard edition and delivery conditions, it should be confirmed before substitution.
Where is S355J2WP used?? architecture, smokestacks, sculpture, trains, containers, and bridges, where the self-protecting rust layer makes painting unnecessary.
What supply sizes are typical for S355J2WP plate?? Thickness up to 150 mm and width up to 4100 mm, with length customized as required, delivered in hot rolled, normalized, as-rolled, or thermo-mechanically rolled states.
