What are the effects of material elements on the performance of steel square tube?

(1) Carbon: the higher the carbon content, the higher the hardness of the steel, but the poorer its plasticity and toughness. Therefore, the carbon element affects the hardness and toughness of steel square tubes.

(2) Sulfur: it is a harmful impurity in steel. Steel with a relatively high sulfur content is prone to brittle fracture when pressure processed at high temperatures, which is usually called hot brittleness. Sulfur is a weight index reflecting the brittle fracture performance of square tubes.

(3) Phosphorus: it can significantly reduce the plasticity and toughness of square tube steel, especially in low temperatures, and it's called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. But on the other hand, in low-carbon steel square tubes with relatively high sulfur and phosphorus, it can make the cutting easy to break, which is beneficial to improving the machinability of the steel. Therefore, phosphorus is a weight index reflecting the brittleness and machinability of square tube steel performance.

(4) Manganese: it can improve the strength of square tube steel, can weaken and eliminate the adverse effects of sulfur, and can improve the hardenability of square tube steel. High alloy steel (high manganese steel) square tubes with a very high manganese content have good wear resistance and other physical properties.