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Seamless hot and cold rolled sub-points (dial) two types of

Seamless hot and cold rolled sub-points (dial) two types of seamless steel tubes.
Hot-rolled seamless steel pipe in general, low and medium pressure boiler pipe, high pressure boiler pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, pipe and other geological steel pipe.
Cold rolled (dial) seamless steel pipe in addition to ordinary steel pipe, low and medium pressure boiler pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe, but also include carbon thin- Thin-walled stainless steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, wall thickness 2.5-75mm, cold-rolled seamless steel pipe can reach 6mm, wall thickness can be 0.25mm, thin-walled tube diameter can be 5mm, wall thickness less than 0.25mm, Cold rolling than the hot rolling dimensional accuracy.
The general use of seamless steel pipe: 10,20,30,35,45 and other high-quality carbon steel 16Mn, 5MnV low alloy steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB alloy steel such as hot-rolled or cold rolled. 10,20 and other low-carbon steel seamless pipe is mainly used for fluid pipelines. 45,40 Cr and other medium-carbon steel seamless pipe used to create mechanical parts, such as cars, tractors force parts. Generally use seamless steel pipe to ensure strength and flattening test. Hot-rolled steel pipe to the state of hot-rolled or heat treatment delivery; cold-rolled state to deliver heat treatment.
Low and medium pressure boiler seamless steel pipe: used in the manufacture of low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall tubes and locomotive boiler with superheated steam pipe, smoke pipe, smoke pipe and arch pipe and so on. High quality carbon structural steel hot-rolled or cold-rolled (dial) seamless steel pipe. The main use of 10,20 steel, in addition to ensuring chemical composition and mechanical properties to do hydrostatic testing, crimping, flaring, flattening and other tests. Hot-rolled hot-rolled delivery, cold-rolled (dial) to heat treatment delivery status.
High-pressure boiler pipe: High-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant steel seamless pipe, which are mainly used to manufacture high pressure and steam boiler pipes above the pressure. These boiler tubes often work under high temperature and high pressure, Pipe under high temperature flue gas and water vapor will occur under the action of oxidation and corrosion, requiring high durability steel pipe, high oxidation resistance, and has good tissue stability, the use of steel are: high-quality carbon structure Steel steel No. 20G, 20MnG, 25MnG; alloy steel 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc .; rust resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler tube in addition to ensure chemical composition and mechanical properties , To be done by the root hydraulic pressure test, to make flaring, flattening test. Pipe to heat treatment delivery status. In addition, the finished steel microstructure, grain size, decarburization also have certain requirements.
Geological drilling and oil drilling seamless steel pipe: In order to detect the underground rock structure, groundwater, oil, natural gas and mineral resources, the use of drilling rig drilling. Oil and natural gas exploitation can not be separated from drilling well. The seamless steel pipe for drilling oil for geological drilling is the main equipment for drilling, which mainly includes core pipe, core pipe, casing pipe and drill pipe. Due to the drilling pipe depth to depth of several kilometers of work, the working conditions are extremely complex, drill pipe subjected to stress such as tension, compression, bending, torsion and unbalanced impact load, but also by the mud, rock wear, therefore, require pipe Must have sufficient strength, hardness, wear resistance and impact toughness, steel pipe with "DZ" (geology pinyin prefix) plus a representative of the steel yield point that the commonly used steel with 45MnB DZ45, 50Mn; DZ50 of 40Mn2,40Mn2Si; DZ55 of 40Mn2Mo, 40MnVB; DZ60 of 40MnMoB, DZ65 of 27MnMoVB. Pipe are heat treatment delivery status.
Petroleum cracking tubes: Tubes, heat exchanger tubes and pipes for petroleum refineries. Common high-quality carbon steel (10,20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to permit chemical composition and mechanical properties of steel, but also to ensure that water pressure, flattening, flaring and other tests, and surface quality and non-destructive testing. Pipe in the state of heat treatment delivery. Stainless steel pipe: stainless steel with a variety of stainless steel hot-rolled, cold-rolled, widely used in petroleum, chemical equipment, pipes and various uses of stainless steel structural parts, in addition to the chemical composition and mechanical properties to be guaranteed, who used to withstand fluid pressure of steel Water pressure test to ensure compliance. All kinds of special steel according to the provisions of the guarantee conditions.

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