Seamless Steel Pipe

What is Seamless Steel Pipe?

Seamless steel pipe is made of whole metal and has no joint on the surface. According to the production method, seamless pipe is divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe, pipe jacking, etc.

Hot rolled seamless steel pipe is made by automatic continuous rolling machine. In the rolling process, when the temperature reaches the recrystallization temperature, the microstructure and mechanical structure of the steel are changed by controlling different stages such as the initial rolling stage, the finishing rolling stage and the crimping stage, so that it can be deformed into different sizes of pipes.The original casting structure of hot rolled steel pipe (hot rolled seamless pipe) steel plate was destroyed by hot rolling process. The grain of steel material can be refined and the defects of steel plate structure are eliminated. Therefore, hot rolled seamless steel pipe has good mechanical properties and excellent strength. It is widely used to transport fluids, such as oil, natural gas, gas, water and some solid materials, shipbuilding, fertilizer equipment and so on.

Cold-drawn seamless steel pipe produced by drawing, extrusion, perforation and other methods of the whole steel pipe surface without joint steel pipe. It is a circular, square, rectangular steel with hollow section and no joints around it. It is made of steel ingot or solid tube billet through perforation and then made by cold dial.Cold-drawn seamless steel tube can do high precision small batch production. Can be used for mechanical structure, hydraulic equipment of high dimensional precision and good surface finish precision cold drawn seamless pipe.

According to different metal materials, seamless steel pipe can be divided into carbon steel seamless pipe, alloy steel seamless pipe, stainless steel seamless pipe.

According to the cross-section shape, seamless steel pipe can be divided into round and special-shaped, and the special-shaped pipe has many complex shapes, such as square, oval, triangle, hexagon, melon seed, star and winged pipe. The maximum diameter is 650mm and the minimum diameter is 0.3mm.

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.