Corten Steel Plate Supplier in India

Corten is the common trade name for weathering steel — a low-alloy structural steel containing deliberate additions of copper, chromium, nickel and, in some grades, phosphorus. On outdoor exposure it develops a dense, tightly adherent oxide layer, usually described as a patina. Unlike ordinary rust, this layer is stable and substantially slows further atmospheric corrosion, so the steel can be used unpainted in many exposed applications. The patina takes months of wet and dry cycling to stabilise and gives the material its characteristic deep russet colour.

Corten A corresponds broadly to ASTM A242 and is a phosphorus-bearing weathering steel, favoured where appearance matters — architectural cladding, facades and sculpture. Corten B corresponds broadly to ASTM A588 Grade A, is a higher-strength structural weathering steel, and is the grade normally specified for load-bearing work such as bridges, structural members and railway wagons. Where a drawing calls for a specific standard rather than the trade name, we supply against that standard and the Mill Test Certificate states it.

We supply Corten A and Corten B weathering steel plate, together with the SPA-H / SPA-C designation to JIS G 3125 and S355J2WP to EN 10025-5, sourced from mills including SSAB, TATA, SAIL and AMNS. Every consignment is supplied with a Mill Test Certificate to EN 10204 3.1 or 3.2. Contact us with your grade, thickness and plate size and we will confirm current availability.

In many exposed applications it does not — that is the reason the material is chosen, since the stable patina takes the place of a coating and removes recurring repainting from the maintenance cycle. It is not suitable everywhere, though. Corten performs poorly where it stays permanently wet, where it is buried or submerged, or in high-chloride environments such as marine splash zones, because the patina cannot dry and stabilise. Run-off staining of adjacent surfaces during the first years of weathering also needs to be allowed for in detailing.

Typical uses fall into two groups. Architectural and decorative work uses the patina for its appearance: facade cladding, privacy screens, planters, signage and sculpture. Structural and industrial work uses it for durability without painting: bridge girders and components, railway wagons and containers, chimney and stack casings, and equipment exposed to the weather in mining, cement and bulk-handling plants.

Yes. Corten is cut by the usual methods for structural plate — flame, plasma and shearing — and we can supply cut-to-size. It is weldable using conventional processes for low-alloy structural steel. For unpainted applications the normal practice is to select a consumable that weathers at a similar rate to the parent plate so the weld does not remain visually distinct once the patina develops. Welding procedures should follow the requirements of the governing standard for the grade being used.