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Effect of several main elements in steel on steel properties ? Carbon (c): Increased carbon content, increased yield point and tensile strength, but reduced plasticity and impact properties. Excessive carbon content is likely to cause unacceptable intergranular corrosion. The boundary between steel and iron is controlled by C content: <2.11% for steel ? Silicon (Si): Si is a deoxidizer and desulfurizer with high strength and hardness to improve the hot workability of steel. ? Chromium (Cr): Chromium can significantly increase the strength, hardness and wear resistance of steel, but at the same time reduce plasticity and toughness. ? Nickel (Ni): Nickel increases the strength of the steel while maintaining good plasticity and toughness. Effect of several main elements in steel on steel properties ? Molybdenum (Mo): The addition of molybdenum to steel improves the mechanical properties of steel. ? Titanium (Ti): Titanium is a deoxidizer in steel. Reduce the effectiveness of sensitivity and cold brittleness. The addition of a certain amount of titanium to the steel has the ability to resist intergranular corrosion. ? Phosphorus (P): Phosphorus is a harmful element in steel, which increases the cold brittleness of steel, deteriorates weldability, reduces plasticity, and deteriorates cold bending performance. In general, the lower the phosphorus content in the steel, the better. ? Sulfur (S): Sulfur is a harmful element in steel, which makes the steel brittle and reduces the ductility and toughness of the steel. It is easy to cause cracks during forging and also reduces the corrosion resistance of the steel. Therefore, the sulfur content should be kept as low as possible. ? Nitrogen (N): Nitrogen increases steel strength, low temperature toughness and weldability. Increase the effectiveness of sensitivity. The right amount of nitrogen improves the pitting resistance and strength of stainless steel.