Carbon structural steel

A kind of carbon steel. The carbon content is about 0.05% ~ 0.70%, and can be as high as 0.90%. It can be divided into ordinary carbon structural steel and high quality carbon structural steel. The former contains more impurities, low price, used in places where the performance requirements are not high, its carbon content is mostly below 0.30%, manganese content is not more than 0.80%, low strength, but plasticity, toughness, cold deformation performance is good. Except in a few cases, it is generally used directly without heat treatment. More made of strip steel, special steel, steel plate, etc. Many uses, the amount is very large, mainly used in railways, Bridges, all kinds of construction projects, the manufacture of various metal components bearing static load and unimportant mechanical parts and general welding parts that do not need heat treatment. High quality carbon structural steel with pure steel, less impurities, good mechanical properties, can be used after heat treatment. According to the manganese content, they were divided into two groups: ordinary manganese content (less than 0.80%) and high manganese content (0.80%-1.20%). The carbon content is less than 0.25%, and it is used directly without heat treatment, or by carburizing, carbon nitriding and other treatments to manufacture small and medium-sized gears, shafts, piston pins, etc. The carbon content is 0.25% ~ 0.60%, the typical steel number is 40,45,40 Mn, 45Mn, etc., which is processed by quenching and conditioning to manufacture various mechanical parts and fasteners. The carbon content is more than 0.60%, such as 65,70,85,65 Mn, 70Mn, etc., which is mostly used as spring steel.