Generally used seamless steel pipe: it is made of 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot-rolled or cold-rolled. Seamless steel pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transmission pipelines. Seamless steel pipes made of medium carbon steels such as 45 and 40Cr are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors. Generally, seamless steel pipes are used to ensure strength and flattening tests. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in heat-treated state.

Seamless steel pipes for low and medium pressure boilers: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water wall pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers. Hot-rolled or cold-rolled (dial) seamless steel pipes with high-quality carbon structural steel. Mainly made of No. 10 and No. 20 steel, in addition to ensuring chemical composition and mechanical properties, water pressure test, hemming, flaring, flattening and other tests are required. Hot-rolled delivery is in hot-rolled state, and cold-rolled (dial) is delivered in heat-treated state.

High-pressure boiler steel pipe: mainly used to manufacture high-quality carbon structural steel, alloy structural steel and stainless heat-resistant seamless steel pipe for steam boiler pipes with high pressure and above. These boiler pipes often work under high temperature and high pressure, The pipe will also be oxidized and corroded under the action of high temperature flue gas and water vapor. Therefore, the steel pipe is required to have high lasting strength, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon structure Steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes in addition to ensuring chemical composition and mechanical properties , to do the hydrostatic test one by one, to do the flaring and flattening test. Steel pipes are delivered in heat-treated condition. In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.

Seamless steel pipes for geological drilling and oil drilling: In order to find out the underground rock structure, groundwater, oil, natural gas and mineral resources, drilling rigs are used to drill wells. Oil and natural gas exploitation is inseparable from drilling wells. Seamless steel pipes for oil drilling for geological drilling are the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe and so on. Because the drilling pipe has to work deep into the formation depth of several kilometers, the working conditions are extremely complex, the drill pipe is subjected to stress such as tension, compression, bending, torsion and unbalanced impact loads, and it is also subjected to mud and rock wear. Therefore, the pipe material is required to be It must have sufficient strength, hardness, wear resistance and impact toughness. The steel used for steel pipes is represented by "DZ" (geological Chinese Pinyin prefix) plus a number one to represent the yield point of the steel. The commonly used steel grades are 45MnB and 50Mn of DZ45; 40Mn2, 40Mn2Si of DZ50; 40Mn2Mo, 40MnVB of DZ55; 40MnMoB of DZ60, 27MnMoVB of DZ65. Steel pipes are delivered in heat-treated condition.

Petroleum Cracking Tubes: Seamless steel tubes for furnace tubes, heat exchanger tubes and pipes used in petroleum refineries. Commonly used high-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to the certified chemical composition and various mechanical properties, the steel pipe must also ensure water pressure, flattening, flaring and other tests, as well as surface quality and non-destructive testing. Steel pipes are delivered in heat-treated condition. Stainless steel pipe: hot-rolled and cold-rolled stainless steel pipes of various stainless steels are widely used in petroleum, chemical equipment pipelines and stainless steel structural parts for various purposes. In addition to ensuring chemical composition and mechanical properties, any steel pipe used for fluid pressure To ensure that the hydrostatic test is qualified. All kinds of special steel pipes must be guaranteed according to the specified conditions.