1:321 stainless steel pipe. Seamless steel tube (GB14976-2002) is used in the manufacture of various structures of low and medium pressure boiler superheated steam pipe, steam pipe, boiling water pipe and boiler flue tube, pipe and brick arch tubes of high quality carbon steel hot rolling and cold drawing (rolling) seamless steel tube.

2: 321 stainless steel pipe: mainly used for the manufacture of high and higher pressure steam boiler pipes with high quality carbon steel, alloy steel and stainless steel seamless steel tubes, the boiler tubes often in high temperature and high pressure pipe will work, oxidation and corrosion in high temperature flue gas and water vapor, therefore requirements of steel pipe have antioxidant properties, high strength, and has good organizational stability, hydraulic pillar.

The steel with 3:321 stainless steel tube: 304321316317310

4: 15MoG steel, alloy structural steel tube 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB etc.; not rust in addition to ensure the chemical composition and mechanical properties of heat resistant steel 1Cr18Ni9, 1Cr18Ni11Nb commonly used external high pressure boiler tubes, one by one to do pressure test, will be expanding and flattening test.

5:321 stainless steel pipe is delivered in heat treatment. In addition, the microstructure, grain size and decarburization layer of the finished steel tube are also required. Seamless pipes for geological drilling and oil drilling and control are used for drilling underground wells to identify underground structures, underground water, oil, natural gas and mineral resources.

Oil and natural gas exploitation is more dependent on drilling. Geological drilling and control of seamless steel pipe for drilling is the main equipment for drilling, including core pipe, core pipe, casing, drill pipe and so on. Because the drilling pipe is going deep into the depth of several kilometers, the 1Cr5Mo alloy tube.

6: the working condition is very complicated, the drill pipe under tension, pressure, bending, torsion and uneven impact load stress, but also by the mud and rock wear, therefore, must have required pipe strength and hardness, wear resistance and impact toughness enough, steel pipe for the use of "DZ" (geology of Chinese Pinyin prefix) plus digital representative steel yield point, commonly used steel with DZ45 45MnB, DZ50 40Mn2, 50Mn; 40Mn2Si; DZ55 40Mn2Mo, DZ60 40MnMoB, DZ65 40MnVB; 27MnMoVB. The steel pipes are all delivered in heat treatment.

Oil cracking pipe: pipe, heat exchanger tube and seamless pipe used in oil refinery. Commonly used high quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing.

7: stainless steel tube with various kinds of stainless steel, cold-rolled stainless steel tube, stainless steel structural parts are widely used in petroleum, chemical equipment and pipeline for various purposes, should guarantee the chemical composition and mechanical properties, who used steel to withstand the pressure to ensure the water pressure test. All kinds of special steel pipe should be guaranteed according to the stipulations.

Welded pipe: also called pipe, which is formed by bending the steel plate or steel strip, and then welded. According to the form of weld, it is divided into straight welded pipe and spiral welded pipe.

Dividedagain general welded pipe, galvanized pipe, blowing pipe, wire tube, pipe metric, roller tube, deep well pump, 321 stainless steel tube, pipe, tube, auto transformer electric welding tube, welding shaped tube and spiral welded pipe.

Alloy steel

8; 321 stainless steel tube is a kind of long steel with hollow section and no joint at the periphery. The steel pipe has a hollow section, which is used as a pipe for conveying fluid, such as pipelines, such as oil, natural gas, gas, water and some solid materials.  The seamless tube is divided into hot rolled tube, cold rolling tube, cold drawing tube, extruding tube and pipe jacking 16Mn seamless pipe.