Types of structural steel

Due to their chemical composition, alloyed and unalloyed steel are distinguished. Unalloyed steel, also called carbon steel, consists of carbon and iron. This type of steel is further divided into high-carbon, medium-carbon and low-carbon steel. Alloy steel, in addition to carbon and iron, contains alloy additives ranging from several to several dozen percent, which influence its properties. The limit content of individual elements is specified and is as follows: Mn (manganese) - 1.65%, Si (silicon) - 0.50, Cu (copper), Pb (lead) - 0.40% each, Cr (chromium), Ni (nickel) - 0.30% each, Al. (aluminium), Bi (bismuth), Co (cobalt), Se (selenium), Te (tellurium), V (vanadium), W (tungsten) – 0.10% each, Mo (molybdenum) – 0.08%, Nb (niobium) – 0.06%, Ti (titanium), Zr (zirconium), La (lanthanum) – 0.05% each, B (boron) – 0.0008%, others (except carbon C, phosphorus P, sulfur S and nitrogen N) – 0.05% each. If the above element is present in steel in values ​​higher than those given, the steel is classified as alloyed

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