Influence of chemical elements in steel tube materials.

　　seamless structural pipe

　　The effect of chromium (CR) in steel pipes can significantly improve the strength, hardness, corrosiveness and wear resistance. It is an important alloy element of stainless steel and heat-resistant steel pipes and plates. On the other hand, it will reduce plasticity and toughness.

　　The role of nickel (Ni) in steel pipe

　　The effect of nickel (Ni) in steel pipe can improve the strength and keep good plasticity and toughness at the same time. It has high corrosion resistance, rust resistance and heat resistance to acid and alkali. However, due to the scarcity of resources, we should try to use other alloy elements instead of nickel chromium steel.

　　Effect of molybdenum on steel pipe

　　The effect of Mo can refine the grain of steel, improve the quenching and heat resistance. It can maintain enough strength and creep resistance (creep is called creep when deformation occurs under long-term stress at high temperature). Adding molybdenum to structural steel can improve mechanical properties. In addition, it can inhibit the brittleness caused by quenching.

　　Effect of titanium on SAE1020 Round Hollow Mild Steel Seamless Structural Pipe

　　The role of titanium (TI) in alloy steel pipe. It is a strong deoxidizer in steel. It can make the internal structure compact and the grain strength fine, and reduce the aging sensitivity and cold brittleness. Moreover, it can improve the welding performance. In CR 18 Ni 9 austenitic stainless steel, the internal grain corrosion can be avoided by adding proper titanium.