The chemical elements of the steel pipe are of great significance to its performance and application. The following are the effects of common chemical elements on the steel pipe:
Major alloying element
Major alloying element
Carbon (C)
Carbon (C) : The main element that determines the strength and hardness of steel. The higher the carbon content, the greater the tensile strength and hardness of the steel pipe, but the plasticity and toughness will be reduced.
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Manganese (Mn) : can improve the strength and toughness of the steel pipe, reduce the toughness and brittleness transition temperature, and as a desulfurizer and weak deoxidizer in the steelmaking process, improve the cold brittleness tendency of steel.
Silicon (Si) :
Silicon (Si) : can enhance the strength and corrosion resistance of steel pipes.
Chromium (Cr) :
Chromium (Cr) : significantly improve the strength, hardness and wear resistance of the steel pipe, while forming a dense chromium oxide protective film on the steel surface to enhance corrosion resistance.
Nickel (Ni)
Nickel (Ni) : improve the strength and low-temperature toughness of the steel pipe, while maintaining good plasticity, but also reduce the adverse effect of copper on thermal brittleness.
Copper (Cu)
Copper (Cu) : improve the corrosion resistance and hydrogen cracking resistance of the steel pipe, when the content is more than 0.2%, it can form a dense protective layer on the steel surface.
Molybdenum (Mo)
Molybdenum (Mo) : Improve the mechanical properties of steel pipes, enhance corrosion resistance.
Vanadium (V) :
Vanadium (V) : The strength and toughness of steel pipes are improved by precipitation strengthening.
Rare earth element
Rare earth elements can refine the grain, improve the strength and toughness of the steel pipe, and improve its low temperature performance.
Harmful element
Phosphorus (P) :
Phosphorus (P) : Phosphorus will significantly reduce the plasticity and toughness of steel, especially at low temperatures, resulting in cold brittleness.
Sulfur (S) :
Sulfur is a harmful element in steel, and a higher content will cause the steel pipe to be brittle at high temperatures, resulting in thermal brittleness.
