The five elements of the role of analytical instruments for steel elements
Five elemental analysis instrument needle on the role of the various elements of the elaborate steel:
1. Carbon (c): Carbon can increase the cold brittleness and aging sensitivity of steel, and it can also reduce the atmospheric corrosion resistance of steel. The amount of carbon in the steel increases, the yield point and tensile strength increase, and the plasticity and impact resistance decrease. When the carbon content exceeds 0.23%, the welding performance of the steel deteriorates. The carbon content of low-alloy structural steel used for welding is generally not more than 0.20%.
2. Sulfur (S): Sulfur is a harmful element in normal conditions, making steel hot brittle, reducing the ductility and toughness of the steel, causing cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance. Therefore, it is generally required that the sulfur content is less than 0.055%, the quality steel requirement is less than 0.040%, and the addition of 0.08-0.20% sulfur to the steel can improve the machinability, which is usually called free cutting steel.
3. Silicon (Si): Silicon is added as reducing agent and deoxidizer in the steelmaking process, so the killed steel contains 0.15%-0.30% of silicon. Increasing the amount of silicon will reduce the welding performance of the steel. If the amount of silicon in the steel exceeds 0.50%-0.06% silicon alloy elements. Silicon can significantly increase the elastic limit, yield point, and tensile strength of steel, commonly used as spring steel. Adding 1.0-1.2% of silicon to the tempered structural steel can increase the strength by 15-20%. The combination of silicon, molybdenum, tungsten, and chromium improves corrosion resistance and oxidation resistance, and can produce heat-resistant steel. Silicon 1-4% low-carbon steel, with high magnetic permeability, for the electrical industry to do silicon steel sheet.
4, manganese (Mn): In the steel-making process, the general steel contains 0.30-0.50% of manganese, is a good deoxidizer and desulfurizer. When adding more than 0.70% of manganese to carbon steel, even if it is "manganese steel, " the steel is more ductile than normal steel, and has higher strength and hardness, improves the hardenability of the steel, and improves the hot workability of the steel. , Usually used for excavator buckets, ball mill liners and so on. Increasing the amount of manganese weakens the corrosion resistance of the steel and reduces the welding performance.
5, phosphorus (P): In general, phosphorus is also a harmful element in steel, increase the cold brittleness of steel, so that the welding performance and cold bending performance deteriorate, reduce the plasticity. Therefore, it is generally required that the phosphorus content be less than 0.045%. High quality steel requires lower phosphorus content.
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