Weathering Steel (Corten-Type Steels)
Weathering steels are low-alloy structural steels designed to form a stable adherent oxide patina in suitable atmospheric exposure, reducing the need for conventional painting in appropriate applications.
Composition & metallurgy
Low carbon with controlled additions commonly including copper, chromium, nickel and phosphorus, depending on grade and product.
Common grades and standards
ASTM A588 and A242 are common US specifications; EN 10025-5 S355J2W/S355J0W and related grades are widely used in Europe. COR-TEN is a trademarked product name and should not be used as a generic grade designation.
Applications
Bridges, architectural façades, sculptures, rail infrastructure, transmission structures, containers and exposed structural steelwork.
Engineering characteristics
Atmospheric corrosion resistance can outperform ordinary carbon steel in alternating wet/dry exposure, but the protective patina may not develop in continuously wet, buried, marine-splash or chloride-heavy environments.
Known manufacturers and producer regions
United States — Nucor and plate/structural producers; Europe — SSAB, ArcelorMittal, Dillinger; Japan — Nippon Steel, JFE; India — Tata Steel, JSW; China — China Baowu and other major plate mills.
Before specifying or purchasing
Confirm governing standard and edition, product form and dimensions, delivery/heat-treatment condition, mechanical properties, toughness, welding requirements, corrosion or wear environment, inspection/NDT, traceability and mill test certification. Manufacturer capability varies by plant and product line.
Element Folio engineering reference. Product names may be trademarks of their respective owners; manufacturer examples are indicative and should be verified against current mill catalogues.
