Common elements in seamless pipes

The quality and performance of seamless pipes are determined according to needs. According to different requirements, different element contents and types must be matched.

(1) Carbon: The higher the carbon content, the higher the hardness of the steel, but the worse the plasticity and toughness.
(2) Sulfur: It is a harmful pollutant in steel. Steels with high sulfur content are prone to cracking when pressed at high temperatures, commonly referred to as hot brittleness.
(3) Phosphorus: It can significantly reduce the plasticity and toughness of steel, especially at low temperature. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. On the other hand, low carbon steel has high sulfur and phosphorus content and is easy to cut, which is beneficial to improve the machinability of steel.
(4) 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 high manganese content has good physical properties such as wear resistance.
(5) Silicon: It can improve the hardness of steel, but the plasticity and toughness decrease. Electrical steel contains a certain amount of silicon, which can improve the soft magnetic properties.
(6) Tungsten: It can improve the red hardness and thermal strength of steel, and can improve the wear resistance of steel.
(7) Chromium: It can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel.
(8) Vanadium: It can refine the grain structure of steel and improve the strength, toughness and wear resistance of steel. Melting into austenite at high temperatures increases the hardenability of the steel; conversely, when it exists in the form of carbides, it reduces its hardenability.
(9) Molybdenum: It can significantly improve the hardenability and thermal strength of steel, prevent temper brittleness, and improve remanence and coercivity.
(10) Titanium: It can refine the grain structure of steel, thereby improving the strength and toughness of steel. In stainless steel seamless steel pipe, titanium can eliminate or reduce the intergranular corrosion phenomenon of steel.
(11) Nickel: It can improve the strength and toughness of steel and improve hardenability. When the content is high, some physical properties of steel and alloys can be significantly changed, and the corrosion resistance of steel can be improved.
(12) Boron: When the steel contains a small amount (0.001-0.005%) of boron, the hardenability of the steel can be doubled.
(13) Aluminum: It can refine the grain structure of steel and inhibit the aging of low carbon steel. Improve the low temperature toughness of steel, but also improve the oxidation resistance of steel, improve the wear resistance and fatigue strength of steel.
(14) Copper: Its prominent role is to improve the atmospheric corrosion resistance of ordinary low-alloy steel, especially when used in combination with phosphorus.

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