According to the quality and performance of steel pipes, we have summarized the properties of different metal elements contained.

Carbon: The higher the carbon content, the higher the hardness of the steel pipe, but the worse the plasticity and toughness.

Sulfur: It is a harmful impurity in steel pipes. If the steel contains high sulfur content, it is easy to become brittle at high temperatures, which is usually called hot brittleness.

Phosphorus: it can significantly reduce the plasticity and toughness of steel, especially at low temperatures. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. On the other hand, the high content of sulfur and phosphorus in low carbon steel can make it easy to cut, which is conducive to improving the cutting performance of steel.

Manganese: it can improve the strength of steel, weaken and eliminate the adverse effects of sulfur, and improve the hardenability of steel. High alloy steel (high manganese steel) with manganese content has good physical properties such as wear resistance.

Silicon: It can improve the hardness of steel, but its plasticity and toughness decrease. But silicon can improve the soft magnetic properties.

Tungsten; It can improve the red hardness and thermal strength of steel, and improve the wear resistance of steel.

Chromium: It can improve the hardena, wear resistance, corrosion resistance and oxidation resistance of steel.

Vanadium: It can refine the grain structure of steel and improve the strength, toughness and wear resistance of steel. When it melts into austenite at high temperature, the hardenability of steel can be increased. On the contrary, when it exists in the form of carbide, its hardenability will be reduced.