SSAW Pipe

 The production method of seamless steel pipe is roughly divided into the cross-rolling method and the extrusion method. The former method is to pierce the tube with oblique rolls and then stretch it with a rolling mill. This method has a fast production speed, but has higher requirements on the processing performance of the tube blank, and is mainly suitable for the production of carbon steel and low-alloy steel tubes. The latter is to pierce the tube blank or ingot with a punch, and then extrude it into a steel tube with an extruder. This method is less efficient than the skew rolling method and is suitable for the production of high-strength alloy steel pipes. Both the skew rolling method and the extrusion method must first heat the tube blank or ingot, and the produced steel tube is called a hot-rolled tube. Steel pipes produced by hot working can sometimes be cold worked as required. There are two methods of cold working: one is cold drawing, which draws the steel pipe through...

 Briefly describe the role of the bottom blowing of the re-blowing in the process of converter smelting (1) Increase the pre-mixing, accelerate the melting of scrap steel, improve the smelting reaction, and facilitate the formation of early slag; (2) Make the blowing process more balanced, reduce splashing, and improve the metal yield; (3) In the later stage, the C-O reaction can be balanced, the oxygen content in the steel can be reduced, and the ultra-low carbon steel can be blown. http://www.tjxysteel.com/news/role-of-the-bottom-blowing-of-the-re-blowing-535.html

 What is the bottom of the furnace? What is the main reason for the rise in the bottom of the furnace? The so-called bottom rise is the gradual increase of the bottom of the furnace during the smelting process, as if it is on the original lining, and a new layer of refractory material is applied. This is a new problem caused by improper operation of dolomite slag. As the bottom of the furnace increases, the slag moves on the line, threatening the furnace cap and affecting the control of the gun position. Therefore, it must be eliminated during the smelting process. The main reason for the increase is the result of excessive slag. http://www.tjxysteel.com/news/main-reason-for-rise-in-bottom-of-furnace-536.html

 The furnace lining works in the furnace. First, a brittle decarburization reaction occurs on the surface, and a “reaction layer” is formed on the surface. The carbon in the reaction layer has been oxidized, and Fe2O3 and SiO2 in the slag invade the brick to form a low melting point substance with MgO and CaO. The more intrusive Fe2O3 and SiO2, the more the fire resistance and high temperature strength of the furnace lining bricks are degraded, even in the state of steelmaking, it becomes the state of the melting contact membrane, and the mechanical scouring of steel slag and furnace gas cannot be withdrawn, so that the brick and furnace lining will be Crisp down. http://www.tjxysteel.com/news/erosion-mechanism-of-Mg-C-brick-lining-537.html

 The secondary combustion oxygen lance has a single flow path and a double flow path. The use of a secondary combustion lance is also a form of thermal compensation technology. By supplying oxygen, the CO gas discharged from the molten pool is partially burned, and the heat in the furnace is supplemented to secondary combustion. Oxygen is divided into two strands after entering the nozzle from one channel. One stream passes through the main hole channel of the Laval nozzle, and the other enters the auxiliary channel of the straight hole. The oxygen flow entering the main channel of Lavalcon is used for smelting; the oxygen entering the auxiliary flow channel is used for the combustion of CO gas in the furnace, also called the end-type secondary combustion oxygen lance; the body of the gun is still three Layer concentric sleeve. The oxygen of the double-flow secondary combustion lance is supplied to the molten pool through the main oxygen flow path and the auxiliary oxygen flow path...

 Straight seam welded steel pipe includes double-sided submerged arc welded longitudinal welded steel pipe (LSAW pipe) and high frequency electric resistance welded pipes (ERW pipe). The length of straight seam welded steel pipe is mainly divided into fixed length and indefinite length. This is mainly according to customer requirements. The length is generally 6-14 meters. Large diameter straight seam welded steel pipe may require rolling two steel plates, also forming a double weld. Welding matters of straight seam welded steel pipes are classified according to manufacturing methods. Steel pipes can be divided into two categories according to manufacturing methods: seamless spliced steel pipes and electric welded steel pipes. Straight seam welded steel pipe is a steel pipe made by rolling a certain standard long strip into a round tube shape and straight seam welding by a high-frequency welding unit. The shape of the steel pipe can be round, square or special. Depends on sizing ro...

 The hardness test is to slowly press a hard indenter into the surface of the sample under specified conditions, and then test the depth or size of the indentation to determine the hardness of the material. Hardness test is a simple, rapid and easy-to-implement method in material mechanical property test. The hardness test is non-destructive, and there is an approximate conversion relationship between the material hardness value and the tensile strength value. The hardness value of the material can be converted into the tensile strength value, which has great practical significance. Since the tensile test is inconvenient to test, and the conversion from hardness to strength is convenient, more and more people only test the hardness of the material and less test its strength. The hardness of seamless steel tubes is generally measured by three hardness indicators: Brinell, Rockwell and Vickers. 1. Brinell hardness In the seamless steel tube standard, the Brinell hardness is widely us...

 10th,Jan,2018, Because of need for equipment, Mr Mehdi from Europe was looking for UN Standard welded steel pipes in small quantity.Because it’s the first time for Mr Mehdi to import, after consulting with other companies, they sent the first enquiry to Tianjin Xinyue Steel Group’s website(www.xysteelpipe.com). According to client’s saying, part of the mill refused to quote because of the small quantity and high technics. After receiving the quotation, xinyue steel confirmed the drawing asap and deal with it immediately. All orders, no matter it’s big or small, are very important to us. After negotiating with the clients, after three months, because of the high technics and serious diameter tolenrance, Mr Mehdi finally placed an trial order with one container to us. After one month and an half, the goods finally arrived the destination.However, because of the transportation problem and the thin wall thickness, one or two pipes are twisted. After knowing the problem, we actively co...

 Xinyue Steel Group began to bid for Nigeria's AMNI ASSET WEST PROJECT in June, 2017, we provide professional technology and documents to support clients.Through our best efforts of Xinyue ,finally we win the AMNI ASSET WEST PROJECT of pipeline 2300 tons in April 2018. AMNI is developing the AAWT field approximately 11 km from the MOPU. This development includes a 12” production pipeline from new AAWT platform to the existing IMA platform and a 4”· Gas pipeline from IMA platform to the AAWT platform. The pipelines will be buried and connected to the risers using spool pieces. This development also includes 16” J-Tube steel casings for the umbilical. During 20th -21th June, 2018, clients came to Changsha Branch, Xinyue Steel Group, we held pre-production meeting of 2 days, in order to make sure every step of production can be carried out smoothly. The quality was strictly produced with the standard and was accepted clients assigned third party to make inspection from raw material to...

 For plasma cutting of spiral steel pipe (ssaw), the difficulty of dust removal is: 1. When the nozzle of the plasma gun is cutting, the air is blown out in two opposite directions at the same time, so that the smoke and dust emerge from both ends of the steel pipe, and the suction port installed in one direction of the steel pipe is difficult to recover the smoke and dust well. 2. The cold air around the suction port enters the suction port from outside the machine gap and the air volume is large, so that the total amount of smoke and cold air in the steel pipe is greater than the effective air volume inhaled by the dust collector, so it becomes impossible to completely absorb the cutting smoke and dust. 3. Since the cutting part is far away from the dust suction inlet, it is difficult for the wind reaching the suction inlet to pump the smoke and dust. To this end, the design principles of the dust cover are: 1) The air volume inhaled by the dust collector should be greater than t...