Steel pipe: steel pipe refers to open at both ends and has a hollow section, the length and the surrounding of the relatively large steel, according to the production method can be divided into a seamless tube, and welded tube, pipe specifications dimensions (such as diameter or length) and wall thickness representation, the size range is very wide, from the diameter is very small capillary until diameter up to a few meters of large diameter pipe. Steel pipe can be used in pipeline, thermal equipment, machinery industry, petroleum geology exploration, container, chemical industry and special purpose.

Seamless steel pipe: seamless steel pipe is made from the whole piece of metal on the surface without the joints of the tube. According to the production method can be divided into hot tube, cold rolling, cold drawing tube, pipe extrusion. According to the section shape can be divided into two kinds of round and shaped. The maximum diameter of the seamless tube is 650 mm (diameter expanding tube), and the minimum diameter is 0.3 mm (Mao Xiguan). According to different thickness and can be divided into thick walled tube and thin wall tube. Seamless pipe is mainly used in petroleum geological exploration, petroleum and chemical cracking tubes, boiler tubes, bearing tubes as well as automotive, aviation and aviation with high precision structural steel pipe, etc..

Welded steel pipe: welded steel pipe is a steel strip or steel plate bending deformation is round, square shape, then welded into the surface of the steel pipe. According to different welding methods can be divided into arc welding, high frequency or low frequency resistance welding, gas welding, furnace pipe, tube Bondi tube etc.. According to the weld shape can be divided into straight seam welded pipe and spiral welded pipe. Welded steel pipe for petroleum drilling and mechanical manufacturing industry, etc.. The furnace pipe can be used as water gas pipe etc., large diameter longitudinal welded pipe for high pressure oil and gas transmission; spiral welded pipe for oil and gas transportation, pipe pile and pier. Welded steel pipe is less cost and higher production efficiency.