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Carbon Steel And Galvanized Steel Tube Mills Have A Certain Role In Strengthening

RLT Group | Updated: Oct 18, 2017

Carbon Steel and Galvanized Steel Tube Mills: Steel that contains less than 2.11% carbon content and does not have a specially added alloying element is known as Carbon Steel and Galvanized Steel Tube Mills.

Effect of constant element on steel performance

Carbon Steel and Galvanized Steel Tube Mills In addition to iron and carbon two main elements, steelmaking materials always have a certain amount of impurities, but also in the smelting process will bring some impurities, such as Si, Mn, P, S, non-metallic inclusions and oxygen, nitrogen, hydrogen and other gases. They have a certain effect on the performance and quality of steel.

(1) Manganese (MN). Manganese is mainly from the steelmaking deoxidation agent. The manganese residue in steel can be dissolved in ferrite and cementite, and the strength and hardness of the steel will be improved. In addition, manganese and sulfur form MNS to reduce the harmful effects of sulphur on steel. Therefore, manganese is a useful element in steel, the content of which is generally 0.25%~0.80%.

(2) Silicon (SI). Silicon is the element that remains in steel after deoxidation reaction of Ferrosilicon deoxidation in the later period of steelmaking. Silicon is soluble in ferrite and has a certain strengthening effect on steel, so silicon is a useful element in steel. But because the content is small,Carbon Steel and Galvanized Steel Tube Mills therefore its enhancement function is not big, generally should control within 0.17% ~ 0.37%.

(3) Sulphur (S). Sulphur is the harmful element of iron and fuel brought into steel. It is in steel with Sheng into compound FeS, FeS with iron to form eutectic (fe+fes), low melting point (985 ℃). When the steel is heated to 1000~1200℃ for rolling or forging, the eutectic crystals along the grain boundaries have melted and the connections between the grains have been broken, causing the steel to crack,Carbon Steel and Galvanized Steel Tube Mills a phenomenon called thermal brittleness. Therefore, sulphur is the harmful element in steel, and its content must not exceed 0.05%.

(4) phosphorus (P). Phosphorus is a harmful element in steel that is taken from pig iron. The phosphate part dissolves in the ferrite to form the solid solution, the partial in the crystallization forms the brittle very big compound fe3p, causes the steel at the low temperature (generally 100 ℃ below) The plasticity and the toughness drop sharply, this phenomenon is called the cold brittleness. When the phosphorus content in steel reaches 0.1%, the cold brittleness is very serious. As a result, phosphorus is a harmful element in steel and the phosphorus content in general steel is limited to below 0.04%.

(5) Non-metallic inclusions. Non-metallic inclusions in steel include oxides, sulfides and silicates. These inclusions are produced by the steelmaking reaction and have not been completely excluded, or from the slag, furnace body, ingot equipment and other refractory materials brought into. Non-metallic inclusions reduce the strength and plasticity of steel, so the less inclusions, the better the quality of steel.

Carbon Steel and Galvanized Steel Tube Mills In addition to iron and carbon two main elements, steelmaking materials always have a certain amount of impurities, but also in the smelting process will bring some impurities, such as Si, Mn, P, S, non-metallic inclusions and oxygen, nitrogen, hydrogen and other gases. They have a certain effect on the performance and quality of steel.