Elements that affect the properties of galvanized steel pipes
(1) Carbon; the higher the carbon content, the higher the hardness of the steel, but the worse its plasticity and toughness.
(2) Sulfur: It is a harmful contaminant in steel. When steel with high sulfur content is subjected to pressure processing at high temperature, it is easy to be brittle, which is usually called 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. But on the other hand, the high content of sulfur and phosphorus in low carbon steel can make it 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 wear resistance and other physical properties.
(5) Silicon; it can improve the hardness of steel, but the plasticity and toughness decrease. The steel for electrical use contains a certain amount of silicon, which can improve the soft magnetic properties.
(6) Tungsten; 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.
In order to improve the corrosion resistance of galvanized steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipe is divided into two types: hot-dip galvanized and electric steel zinc. The hot-dip galvanized galvanized layer is thick and the cost of electro-galvanized is low, so there are galvanized steel pipes.
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