Seamless steel pipes have hollow sections and are widely used as pipes for conveying fluids, such as pipes for conveying petroleum, natural gas, gas, water, and some solid materials. Compared with solid steel such as round steel, steel pipes have a lighter weight when the bending and torsional strength is the, and they are an economical section of steel. They are widely used in the manufacture of structural parts and mechanical parts, such as oil drilling rods, car drive shaft, bicycle frames, and steel scaffolding used in construction. Manufacturing ring-shaped parts with steel pipes can improve the utilization rate of materials, simplify the manufacturing process, save and processing time, and steel pipes are widely used in manufacturing.

Specifications of seamless steel pipes Outer diameter (mm) Wall thickness (mm) Inner diameter (mm) 21.3 26.733.4 48.3 60.3 88.9 114.3 141.3 18.3 219.1 2.77 3.73 4.55 5.08 5.547.62 8.56 9.53 10.97 12.70 15.76 9.24 24.30 38.14 49.22 73.66 97.18122.24 146.36 193.70