51 steel pipe network to share: seamless steel pipe and welded pipe where the difference

1. Appearance, the difference between seamless steel pipe and welded pipe welded pipe wall, but no seamless. 2. Seamless pipe pressure is higher, the pipe is generally about 10 MPa, pipe is now doing seamless processing. 3. Seamless steel pipe is a molding in the rolling. Welded steel pipe need to roll after welding, generally have spiral welding and straight welding. Seamless performance better, of course, the price is higher. Steel is a hollow long steel, a large number of pipes used to transport fluids such as oil, natural gas, water, gas, steam, etc., in addition, bending and torsional strength at the same time, the lighter, it is also widely For the manufacture of mechanical parts and engineering structures. Also commonly used for the production of all kinds of conventional weapons, barrels, shells and so on. Steel pipe classification: seamless steel pipe and welded steel pipe (seam pipe) two categories. According to the cross-sectional shape can be divided into round and special-shaped pipe, pipe is widely used, but there are some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal shaped steel pipe. For the fluid pressure to withstand the hydraulic test to test the pressure capacity and quality, under the provisions of the pressure does not leak, soaked or expanded to be qualified, some of the steel pipe but also according to the requirements of the standard or requirements of the curling test , Flaring test, flattening test. Seamless steel pipe: seamless steel pipe is made of steel ingot or solid tube perforation made of capillary, and then by hot-rolled, cold-rolled or cold dial made. Seamless steel pipe specifications with the outer diameter * mm mm said. 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 5mm wall thickness less than 0.25mm, cold Hot rolling rolling than the high dimensional accuracy. General seamless steel pipe is 10,20,30,35,45 and other high-quality carbon steel 16Mn, 5MnV low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other bonded steel 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 with hot-rolled state or heat treatment delivery status; Cold-rolled heat to heat treatment delivery. Low and medium pressure boiler seamless steel pipe: used in the manufacture of a variety of low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall tubes and superheated steam locomotive boiler pipe, smoke pipe, pipe and arch pipe. 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 used mainly in the manufacture of high pressure and steam boiler tubes above these pressures. These boilers work under high temperature and pressure by the party , The pipe in the high temperature flue gas and water vapor will occur under the action of oxidation and corrosion, requiring high durability pipe steel, high oxidation resistance, and has good tissue stability, the use of steel are: high-quality carbon Structural steel steel with 20G, 20MnG, 25MnG; alloy steel steel No. 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB; rust resistant steel common 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler tube to ensure chemical composition and mechanical properties In addition, water pressure test should be done root by root, 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 with seamless steel pipe; In order to ascertain 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. Geological Drilling and Control Oil drilling seamless steel pipe 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, pipelines and various uses of stainless steel structural parts, in addition to ensuring chemical composition and mechanical properties, where used as fluid pressure to withstand the steel pipe Water pressure test to ensure compliance. All kinds of special steel according to the provisions of the guarantee conditions.

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