Large-caliber thick-walled seamless steel pipes

Large-caliber thick-walled seamless steel pipes are divided into seamless steel pipe hot-rolling and hot-spreading. Hot-rolled seamless steel pipes are divided into general steel pipes, low- and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, and petroleum cracking pipes. , geological steel pipes and other steel pipes.
Cold-rolled (dial) seamless steel pipes include general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, as well as carbon thin-walled steel pipes and alloy thin-walled steel pipes. Stainless steel pipe, special-shaped steel pipe. Hot-rolled seamless pipe outer diameter is generally greater than 32mm, wall thickness 2.5-75mm, cold-rolled seamless steel pipe diameter can be up to 6mm, wall thickness can be to 0.25mm, thin-walled pipe outer diameter can be 5mm, wall thickness is less than 0.25mm, Cold rolling has higher dimensional accuracy than hot rolling.
General seamless steel pipe: It is used 10#, 20#, 30#, 35#, 45# high quality carbon steel 16Mn, 5MnV low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB alloy steel hot rolling or cold Rolled into. 10,20 and other seamless tubes made of low carbon steel are mainly used for fluid transportation pipelines. The seamless pipes made of medium-carbon steel such as 45# and 40Cr are used to make mechanical parts such as parts for vehicles and tractors. Generally used seamless steel pipe to ensure strength and flattening test. The hot-rolled steel pipe is delivered in a hot-rolled state or a heat-treated state; the cold-rolled steel is delivered in a heat-treated state.
Seamless steel tubes for low and medium pressure boilers: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall pipes, superheated steam pipes for boilers, large smoke pipes, small smoke pipes, and arched brick pipes. High-quality carbon structural steel hot-rolled or cold-rolled (dial) seamless steel pipe. It is mainly made of steel No.10 and No.20. Except for guaranteeing chemical composition and mechanical properties, hydraulic pressure test, crimping, flaring, flattening and other tests are to be done. Hot rolling is delivered in the hot rolled state and cold rolled (dispensed) is delivered in the heat treated state.
High-pressure boiler pipe: High-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipe used mainly for the production of high pressure and high pressure steam boiler pipes, these boiler pipes are often operated under high temperature and high pressure, The tubes are also oxidized and corroded under the effect of high-temperature flue gas and water vapor. Therefore, the steel tubes are required to have high durable strength, high oxidation resistance, and good organization stability. The steel grades are used: High-quality carbon structure The steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust-resistant heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler tubes in addition to chemical composition and mechanical properties We must do the hydrostatic test one by one, and we must do flaring and flattening tests. The steel pipe is delivered in a heat-treated state. In addition, there are certain requirements on the microstructure, grain size, and decarburization layer of the finished steel pipe.
Geological drilling and seamless drilling of oil drilling: In order to ascertain the underground rock structure, groundwater, oil, natural gas and mineral resources, the drilling rig was used to drill wells. Oil and gas exploitation can not be separated from drilling wells. Seamless steel pipe for oil drilling for geological drilling is the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe and so on. Because the drilling pipe is required to work deep into the depth of a few kilometers, the working conditions are extremely complex. The drill pipe is subjected to stress such as pulling, pressing, bending, torsion, and unbalanced impact loads, and it is also subject to mud and rock wear. Therefore, the pipe is required. Must have sufficient strength, hardness, wear resistance and impact toughness, steel with steel "DZ" (Geological Pinyin initials) plus a number to represent the steel yield point, commonly used steel DZ45 45MnB, 50Mn; 40Mn2, 40Mn2Si of DZ50; 40Mn2Mo, 40MnVB of DZ55; 40MnMoB of DZ60; 27MnMoVB of DZ65. Steel pipes are delivered in a heat-treated state.
Petroleum Cracking Pipes: Seamless tubes for furnace tubes, heat exchanger tubes, and pipes used in petroleum refining plants. 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 chemical composition and various mechanical properties of the steel pipe, it is also necessary to ensure that the water pressure, flattening, flaring and other tests, as well as the surface quality and non-destructive testing. Steel pipes are delivered under heat treatment. Stainless steel pipe: It is hot-rolled and cold-rolled stainless steel pipes of various stainless steels. It is widely used in petroleum and chemical equipment pipelines and stainless steel structural parts for various purposes. In addition to ensuring chemical composition and mechanical properties, it is used as a steel pipe to withstand fluid pressure. To ensure that the water pressure test qualified. All kinds of special steel pipes should be guaranteed by the regulations.
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