Seamless steel pipe is perforated by the whole round steel, and the steel pipe without weld on the surface is called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold drawn seamless steel pipe, extruded seamless steel pipe, pipe jacking, etc. According to the section shape, seamless steel pipes are divided into circular and special-shaped pipes. Special-shaped pipes have many complex shapes, such as square, oval, triangular, hexagonal, melon seed, star and winged pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different uses, there are thick wall seamless steel pipe and thin wall seamless steel pipe. Seamless steel pipe is mainly used for petroleum geological drilling pipe, cracking pipe for petrochemical industry, boiler pipe, bearing pipe and high-precision structural steel pipe for automobile, tractor and aviation.
Seamless steel pipe is widely used.
1. Seamless steel pipes for general purposes are rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output. They are mainly used as pipes or structural parts for conveying fluid.
2. There are three types of supply according to different purposes:
a. Supply according to chemical composition and mechanical properties;
b. Supply according to mechanical properties;
c. Supply according to hydrostatic test. If the steel pipe supplied according to class A and B is used to bear liquid pressure, it shall also be subject to hydrostatic test.
3. Seamless pipes for special purposes include seamless pipes for boilers, chemical and electric power, seamless steel pipes for geology and seamless pipes for petroleum.
Seamless steel pipe has hollow section and is widely used as pipeline for conveying fluid, such as pipeline for conveying oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe has lighter weight when its bending and torsional strength is the same. It is an economic section steel.
It is widely used to manufacture structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffold used in construction. It can improve the material utilization rate, simplify the manufacturing process and save materials and processing hours. It has been widely manufactured with steel pipe.
Post time: Apr-18-2022