Effect of several main elements in steel on steel properties
Carbon (c): The carbon content increases, the yield point and tensile strength increase, but the plasticity and impact properties decrease. If the carbon content is too high, the intergranular corrosion is unacceptable. The boundary between steel and iron is controlled by C content: 2.11% is steel.
Silicon (Si): Si is a deoxidizer and a desulfurizer. It has high strength and hardness and can 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 steel and maintains good ductility and toughness.
Molybdenum (Mo): The addition of molybdenum to steel improves the mechanical properties of steel.
Titanium (Ti): Titanium is a deoxidizer in steel, which reduces the practical sensitivity and cold brittleness. The addition of a certain amount of titanium to steel has the ability to resist intergranular corrosion.
Phosphorus (P): Phosphorus is a harmful element in steel, which increases the cold and brittleness of steel, deteriorates the welding performance, reduces the plasticity, and deteriorates the cold bending performance. Under normal circumstances, the lower the phosphorus content in the steel, the better.
Sulfur (S): Sulfur is a harmful element in steel, which causes hot brittleness of steel, reduces the ductility and toughness of steel, causes cracks during forging, and also reduces the corrosion resistance of steel. Therefore, the sulfur content should be controlled as much as possible. Got low.
Nitrogen (N): Nitrogen can increase the strength of steel, low temperature toughness and weldability, and increase the practical sensitivity. The proper amount of nitrogen can improve the pitting resistance and strength of stainless steel.