Nov 9, 2023 · Weathering Steel – A606-4, A588, A847 and A242. COR-TEN steel is no longer available, so when someone talks about corten steel, they are almost certainly talking about weathering steels A606-4, A588, A847 and A242. Corten steel panels have similar chemical compositions, and they meet the ATSM G101 standard of 6.0 or higher. A588