What is the general material for seamless pipes

The materials of seamless pipes include carbon structural steel, stainless acid resistant steel, and alloy steel. According to the cross-sectional shape, seamless steel pipes can be divided into two types: one is irregular, and the other is circular. Irregular pipes have various complex shapes such as square, triangle, hexagonal, star, and winged pipes. The maximum diameter of seamless pipes reaches 650mm and the minimum diameter is 0.3mm. There are thick walled and thin-walled pipes, and seamless steel pipes are mainly used for petroleum geological drilling pipes, decomposition pipes, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles and aviation.