(1) Carbon: The higher the carbon content, the higher the hardness, but the worse its plasticity and toughness. (2) sulfur: is the harmful impurities in steel, high sulfur steel at high temperature during pressure processing, easy to brittle, usually called hot brittleness. (3) Phosphorus: can make steel plasticity and toughness decreased significantly, especially in the more severe at low temperatures, this phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. However, on the other hand, it is advantageous to contain high sulfur and phosphorus in low-carbon steel to make it easy to cut and to cut steel. (4) Manganese: can improve the strength of steel, can weaken and eliminate the adverse effects of sulfur, and can improve the hardenability of steel, high alloy steel (manganese steel) with high manganese content has good wear resistance and Other physical properties. (5) Silicon: It can improve the hardness of steel, but plasticity and toughness decreased, electrical steel containing a certain amount of silicon can improve the soft magnetic properties. (6) Tungsten: can improve the red hardness and thermal strength of steel, and can improve the wear resistance of steel. (7) Chromium: can improve the hardenability and wear resistance of steel, can improve the corrosion resistance of steel and anti-oxidation. (8) Vanadium: can refine the grain structure of steel, improve the strength, toughness and wear resistance of steel. When it melts into austenite at a high temperature, it increases the hardenability of the steel, whereas it decreases its hardenability when it is in the form of carbides. (9) Molybdenum: It can obviously improve the hardenability and thermal strength of steel and prevent temper brittleness. (10) Titanium: can refine the grain structure of steel, thereby enhancing the strength and toughness of steel. In stainless steel, titanium can eliminate or reduce the intergranular corrosion of steel. (11) Nickel: can improve the strength and toughness of steel, improve hardenability. High content, can significantly change some of the physical properties of steel and alloy, improve the corrosion resistance of steel. (12) Boron: When the steel contains a trace amount of (0.001-0.005%) boron, the hardenability of steel can be doubled. (13) Aluminum: can refine the grain structure of steel, suppress the aging of mild steel. Improve the toughness of steel at low temperatures, but also improve the oxidation resistance of steel to improve the wear resistance and fatigue strength of steel. (14) Copper: Its prominent function is to improve the atmospheric corrosion resistance of ordinary low-alloy steel, especially when used in combination with phosphorus.
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