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Ferritic and martensitic stainless steels are represented by 400 series numbers.

source：English website  |  Release time：2023年05月18日
Steel is a general term for iron-carbon alloys with carbon content and mass percentage between 0.02% and 2.11%. The chemical composition of steel can vary greatly. Steel containing a small amount of manganese, phosphorus, silicon, sulfur and other elements with carbon content less than 1.7% is called carbon steel [5]. In practice, steel often contains different alloying elements, such as manganese, nickel, vanadium, and so on, depending on its use. The application and research of steel has a long history, but the production of steel was a high cost and low efficiency work until the invention of Bayes process in the 19th century. Today, steel, with its low price and reliable properties, is one of the most used materials in the world and an indispensable component in construction, manufacturing and People's Daily life. It can be said that steel is the material foundation of modern society.
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