Home / Resources / Product Information / Stainless Grades / 400 Series Stainless / 430 Stainless Steel. 430 Stainless Steel. Penn Stainless inventory now includes Alloy 430 (UNS S43000) in sheet, sheet coil, plate, round bar, processed flat bar and tubular products.Buy Stainless Steel Sheet/Plate 430 OnlineStainless Steel 430 Product Guide Stainless Steel Tolerance Table. Stainless Steel Sheet/Plate 430 is normally used for architectural, machine, automotive, natural gas/petroluem/oil, thermal, and furniture applications. 430 stainless is notable for having a corrosion resistance similar to nickel stainless steels when exposed to atmospheric and mildly corrosive environments.