(1) the performance of carbon steel is mainly determined by carbon content. As the carbon content in the steel increases, the strength and hardness of the steel increase, while the plasticity and toughness decrease.
(2) The mass fraction of silicon in silicon cast carbon steel is 0.2% - 0.45%, which has little effect on mechanical properties. A certain amount of silicon is required to ensure deoxidization of steel, so silicon is a useful element in steel.
(3) sulfur and sulphur are harmful elements in steel. They exist mainly in the form of Fey in steel. The eutectic formed with iron has a melting point of 989 degrees, much lower than that of ASTM A182 F55 300LB Forged Stainless Steel Plate Flange. In the solidification process of stainless steel plate flange, sulfide often precipitates at the grain boundary of steel. Because of its low strength and brittleness, it greatly reduces the mechanical properties of steel and is easy to produce hot brittleness at high temperature. If the molten steel deoxidizes poorly and contains more FeC, the sulfide forms ternary eutectic with iron and Fe0, which has lower melting point and is more harmful. Sulphur also has adverse effects on the welding properties of stainless steel plate flange. Therefore, sulphur should be removed as far as steelmaking is concerned.
(4) Manganese and manganese are required to be 0.5% - 0.8% in cast stainless steel plate flange, and their functions are deoxidization and desulfurization.
(5) phosphorus and phosphorus are also harmful impurities in steel. The smaller the better, the mass fraction is less than 0.06%.
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