Stainless steel 430 (EN 1.4016) with 17% chromium, which is used in washing machine drums, dishwasher interiors and refrigerator exteriors. Type 409 Type EN 1.4003+Nb) is used extensively in the manufacture of automotive exhausts Variants of EN 1.4105 are soft magnetic grades used in injectors, . Martensitic stainless steels offer a wide range of properties and are used as stainless engineering steels, stainless tool steels, creep resisting steels. They fall into 4 categories (with some overlap): Martensitic stainless steels form a family of stainless steels that can be heat treated to provide the adequate level of mechanical properties. The heat treatment typically
Stainless steel in London in 1929. Brearley applied for a US patent during 1915 only to find that Haynes had already registered a patent. Brearley and Haynes pooled their funding and with a group of investors formed the American Stainless Steel Corporation, with headquarters in Pittsburgh, Pennsylvania. In the beginning, stainless steel was sold in the US under different brand names like "Allegheny metal" and "Nirosta steel". Even within the metallurgy industry the eventual name remained unsettled; in 1921 one trade journal was calling it "unstainable steel". In 1929, before the Great Depression hit, over 25,000 tons of stainless steel were manufactured