S355 seamless carbon steel tube, is made of steel ingot or solid tube billet through perforated capillary, and then made by hot rolling, cold rolling or cold drawing.
Specification and classification
The specification of seamless steel pipe is expressed by outer diameter * wall thickness mm number.
Classification of seamless carbon steel tube: seamless steel tube hot rolled and cold rolled (dial) seamless steel tube two categories.
Hot-rolled seamless steel tube can be divided into general steel tube, low and medium pressure boiler steel tube, high pressure boiler steel tube, alloy steel tube, stainless steel tube, petroleum cracking tube, geological steel tube and other steel tube.
Cold rolling (dial) seamless steel pipe in addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipes, but also including carbon thin wall steel pipe, alloy thin wall steel pipe, stainless steel pipe, stainless steel pipe, shaped steel pipe.The outer diameter of hot rolled seamless pipe is generally more than 32mm, wall thickness 2.5-75mm, cold rolled seamless steel pipe diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin wall diameter can be up to 5mm, wall thickness is less than 0.25mm, cold rolling than hot rolling size accuracy.
General seamless carbon steel tube: it is made of 10, 20, 30, 35, 45 and other high-quality carbon junction steel 16Mn, 5MnV and other low alloy structure steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolling or cold rolling.10, 20 and other low carbon steel manufacturing seamless tube is mainly used for fluid transport pipeline.Seamless tubes made of medium carbon steel such as 45 and 40Cr are used to make mechanical parts, such as stressed parts of cars and tractors.Generally used seamless steel tube to ensure the strength and flattening test.Hot rolled steel tube in hot rolling state or heat treatment state delivery;Cold rolling delivery in heat treatment condition.
Seamless steel tube for low and medium pressure boiler: used for manufacturing various low and medium pressure boiler, superheated steam tube, boiling water tube, water wall tube and superheated steam tube for locomotive boiler, big smoke tube, small smoke tube and arch brick tube.Use high quality carbon structural steel hot rolled or cold rolled (dial) seamless steel tube.Mainly used 10, 20 steel manufacturing, in addition to ensure the chemical composition and mechanical properties to do hydraulic tests, edge rolling, flaring, flattening and other tests.Hot rolling in hot rolling state, cold rolling (dial) in heat treatment state.
High-pressure boiler tubes: mainly used in the manufacture of high pressure and over pressure steam boiler pipes, etc. With high quality carbon structural steel, alloy steel and stainless heat resistant steel seamless steel tube, these often under high temperature and high pressure boiler tube, tube in high temperature flue gas and steam will happen under the action of oxidation and corrosion, so the steel pipe with high rupture strength, high oxidation resistance, and have good organizational stability, using steel grade are: high quality carbon structural steel grade 20 g, 20 MNG, 25 MNG;Alloy structural steel no. 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.There are rust heat resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler tube in addition to ensure the chemical composition and mechanical properties, to do the hydraulic test, to do the flaring, flattening test.Steel pipe is delivered in heat treatment condition.In addition, the microstructure, grain size and decarburization layer of finished steel pipe are also required.
Seamless steel pipe for geological drilling and oil drilling: drilling Wells with drilling RIGS to explore underground rock structure, groundwater, oil, gas and mineral resources.Oil and gas exploitation is inseparable from drilling Wells, geological drilling with seamless steel pipe is the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe and so on.Due to the drilling pipe to go deep into the thousands of meters formation depth work, working conditions is very complex, drill pipe under pull, pressure, bending, torsion and uneven impact load stress, but also by mud, rocks and wear, therefore, requires tubing must have sufficient strength, hardness, wear resistance and impact toughness, steel pipe steel with "DZ" pinyin "(geology) plus number one on behalf of the steel yield point, said common steel grade DZ45 MNB 45, 50 mn;DZ50 40Mn2, 40Mn2Si;DZ55 40Mn2Mo, 40MnVB;DZ60's 40MnMoB, DZ65's 27MnMoVB.Steel pipes are delivered in heat treatment condition.
Petroleum cracking pipe: seamless pipe for furnace pipe, heat exchanger pipe and pipeline used in petroleum refinery.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 pipes, the tests of water pressure, flattening and flaring, as well as the surface quality and non-destructive inspection should be guaranteed.Steel tubes are delivered under heat treatment.Stainless steel pipe: with all kinds of stainless steel hot rolling, cold rolling stainless steel pipe, widely used in petroleum, chemical equipment pipe and all kinds of stainless steel structural parts, in addition to ensure chemical composition and mechanical properties, which used for bearing fluid pressure steel pipe to ensure water pressure test qualified.All kinds of special steel pipes should be guaranteed according to regulations.
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