ERW, SSAW, LSAW (UOE) difference
Conveying pipe by the different pipe process, can be divided into seamless steel tube (SML), mainly as oilfield gathering tube and small diameter internal high pressure natural gas pipeline, used for long distance oil and gas pipeline of few in number, the vast majority of long distance pipeline is to use high frequency straight seam welded pipe (ERW), spiral submerged arc welding pipe (SSAW), straight seam submerged arc welding pipe (LSAW) three. The table below for the process features of several kinds of steel pipe and quality performance contrast:
High frequency straight seam welded pipe (ERW steel pipe) according to the welding process is divided into different induction welding and resistance welding two forms, using hot rolled wide strip coil as raw material, through the continuous forming, bending, welding, heat treatment, sizing, straightening, cutting process, such as weld short compared with spiral welded pipe, high dimensional accuracy, uniform wall thickness, good surface quality, high pressure, etc. But the disadvantage is that only production of small diameter thin wall pipe, weld easy generation resistant, incomplete fusion, trench corrosion defects. Widely used such as city gas, crude oil transportation.
Spiral submerged arc welding pipe (SSAW) steel strip coil direction when the forming Angle with the center line of the pipe forming (adjustable), forming and welding, the welding seam into spiral, advantage is that the same specifications of the steel strip can produce various specifications of the steel tube diameter, raw material range is larger, the weld can avoid the principal stress, the stress condition is good, the disadvantage is that poor geometry size, weld length compared with straight seam length, easy to produce cracks, porosity, slag, weld defects such as welding, welding stress is tensile stress state. The rules and regulations of general oil and gas long distance pipeline design of spiral submerged arc welding pipe can only be used for 3, 4 regions. Abroad will improve after this process will be raw materials instead of steel plate, forming and welding, then welding and lean, cold expanding, after welding, the welding quality is close to UOE tube, at home there is no such process, is the direction of the spiral tube factory to improve in our country. "West-east gas" spiral tube is still used by traditional craft production, only the pipe hole enlargement. The United States, Japan and Germany, on the whole, negative SSAW, don't think it is proper to use SSAW trunk; Canada and Italy part use SSAW, Russia a small amount of use of SSAW, and have made a very strict complementary condition, due to historical reasons, most domestic trunk or use SSAW.
Straight seam submerged arc welding pipe (LSAW) based on single Zhang Zhonghou plate as raw material, the steel in the mold or molding machine medium-voltage (roll) into the pipe, using double-sided submerged arc welding and ChengJinHang production of hole enlargement. Its finished product specification range is wide, the toughness of the weld, plasticity, good uniformity and compactness, with large pipe diameter, wall thickness, strong resistance to high pressure, low temperature corrosion resistance, etc. In the construction of high strength, high toughness, high quality of long distance oil and gas pipeline, the steel tube are mostly straight seam submerged arc welding of large diameter thick wall pipe. According to the provisions of the API standard in large oil and gas pipelines, when the elevations, sea and city populated area in class 1, 2, straight seam submerged arc welding pipe is the only specify the applicable type. According to the forming methods of different can be divided into:
UOE welded pipe, sheet steel plate after edge bending, after U shape, O forming, welding, welding, mechanical cold expanding process;
JCOE welded pipe: according to "J - E - C - O" after welding, forming, welding process by cold hole enlargement, etc; HME welded pipe: the mandrel rolling method according to the "C - C - O" after forming, welding process by cold hole diameter, etc
2016/12/29
2016/12/28
API line pipe manufacturer
API 5L line pipe according to the production process is divided into the submerged arc welding steel pipe, etc. 8. But the main use of Seamless steel tube (Seamless), high frequency straight seam Resistance Welding steel pipe (Electric - to hold the Arc Welding, shorthand for ERW), straight seam Submerged Arc Welding pipe (Longigudinally Submerged Arc Welding, shorthand for LSAW), spiral seam Submerged Arc Welding pipe, Spirally Submerged Arc Welding, shorthand for SSAW), etc.
Straight seam submerged arc welding pipe press forming method is divided into UO (UOE), RB (RBE), JCO (JCOE), etc. The steel plate in forming mould pressing U first, then pressed into an o-ring, and then evaluated for submerged arc welding, after welding are usually at the end or span range (Expanding) called the UOE welded pipe, hole diameter is not called UO of hole diameter welded pipe. The steel plate roller bend forming (Roll Bending), and then evaluated for submerged arc welding, after welding for RBE hole diameter welded pipe or not for hole enlargement RB welded pipe. Will the steel plate according to the order of type J - C - O forming, hole enlargement of JCOE welded pipe after welding or not for hole enlargement JCO welded pipe. Of the LSAW welded pipe is a widespread use of UOE. High frequency electric resistance welded pipe ERW mainly by high frequency current skin effect and proximity effect melted the tube embryo edge, then under the action of squeezing roller pressure welding, its characteristic is no foreign filler metal, heat affected zone is small, high production efficiency. Spiral welded pipe used in long distance line SSAW pipe has a long history, is our country at present mainly adopts the line pipe.
APISPEC5L pipeline standards:
API SPEC 5 l, the American petroleum institute standards
The national standard GB/T9711 - China
2016/12/27
Coat-Plating Methods of Galvanized steel Pipes
Coat-Plating Methods of Galvanized steel Pipes
Hot dip galvanizing can protect steel pipes very well. When zinc is in liquid state, plate the steel with a thick layer of pure zinc after the complicated physical and chemical interaction and thus will make the hot dip galvanizing come into being. Also a zinc and steel alloy layer will be generated during this process. With this kind of layer and corrosion resistance feature, galvanized pipes can be applied to different severe corrosion environments, such as strong acid, alkali frog, etc., which is incomparable to other electro galvanizing.
Advantages of hot dip zinc galvanized pipes：
First, in general atmosphere, a very thin and dense layer of zinc oxide will be formed on the surface of zinc coating. It is hard to dissolve in water, therefore plays a certain protective effect to steel substrate. So, if the surface of steel pipe is covered with a quite thick and dense pure zinc layer, the steel substrate will be protected from contacting with any corrosive solution and avoid erosion.
Second, galvanized connection is very strong. When dissolving zinc and iron together, a good wear resistance will come into being and it can help the steel pipe become more strong and durable.
Third, after hot dip galvanizing, the mechanical properties of steel pipes will be improved effectively. Also, it can eliminate the stress of steel pipes in molding and welding process and benefit the lathe work.
Forth, due to the excellent ductility of zinc, its alloy layer can combine strongly with steel pipe so that plating will be protected from damage even in rolling, bending, wiredrawing, cold blanking and other molding situations.
What’s more, the surface of galvanized pipe will become bright and beautiful after the hot dip galvanizing.
2016/12/26
The comparison of ERW steel pipe and LSAW steel pipe
The comparison of ERW steel pipe and LSAW steel pipe
The ERW steel pipe Resistance is high frequency straight seam welded pipe, the English Electric hold Welding, abbreviation abbreviation for ERW, used for transporting oil, gas and vapor liquid object, can meet the requirements of high and low pressure various, currently in the field of conveying pipe in the world occupies a pivotal position.
1, welded pipe refers to the common "submerged arc welding steel pipe," marked "SC" electrical engineering, can be used as water gas pipe can also make the threading pipe, thick.
2, line pipe, wire and tube, thin, with a "T", said can only do threading works.
3, ERW pipe is "high-frequency resistance welding steel tube", unlike ordinary welded pipe welding process, welding seam is composed of steel belt ontology of parent metal melting and mechanical strength than the general welding control. "LSAW steel pipe is the main technique straight seam submerged arc welding steel pipe features: 1 steel tube forming process, the steel plate uniform deformation, residual stress is small, the surface does not produce scratches. Processing of steel pipe diameter and wall thickness of the steel pipe size range, more flexibility, especially in the production of high grade thick wall steel tube, especially in large diameter thick wall pipe has incomparable advantage over other process, can satisfy the requirement of users in the steel pipe specification more; 2 use in the process of the internal and external welding (welding) after welding process, can be in the best position for welding, is not easy to appear the wrong side, partial and incomplete fusion welding defects, such as easy to control the welding quality. 3 for overall mechanical expanding, can effectively improve the size precision of steel tube, and improve the distribution of stress in steel tube, to avoid due to the damage caused by stress corrosion, is advantageous to the field of welding construction at the same time;
4 ,to 9 100% of steel pipe quality inspection, make the whole process of steel pipe production are under effective detection, monitoring, effectively ensure the product quality.
5 ,the whole production line all equipment with the function of the computer data acquisition system networking, realize the data real-time transmission, by the central control room for production.
The ERW steel pipe Resistance is high frequency straight seam welded pipe, the English Electric hold Welding, abbreviation abbreviation for ERW, used for transporting oil, gas and vapor liquid object, can meet the requirements of high and low pressure various, currently in the field of conveying pipe in the world occupies a pivotal position.
1, welded pipe refers to the common "submerged arc welding steel pipe," marked "SC" electrical engineering, can be used as water gas pipe can also make the threading pipe, thick.
2, line pipe, wire and tube, thin, with a "T", said can only do threading works.
3, ERW pipe is "high-frequency resistance welding steel tube", unlike ordinary welded pipe welding process, welding seam is composed of steel belt ontology of parent metal melting and mechanical strength than the general welding control. "LSAW steel pipe is the main technique straight seam submerged arc welding steel pipe features: 1 steel tube forming process, the steel plate uniform deformation, residual stress is small, the surface does not produce scratches. Processing of steel pipe diameter and wall thickness of the steel pipe size range, more flexibility, especially in the production of high grade thick wall steel tube, especially in large diameter thick wall pipe has incomparable advantage over other process, can satisfy the requirement of users in the steel pipe specification more; 2 use in the process of the internal and external welding (welding) after welding process, can be in the best position for welding, is not easy to appear the wrong side, partial and incomplete fusion welding defects, such as easy to control the welding quality. 3 for overall mechanical expanding, can effectively improve the size precision of steel tube, and improve the distribution of stress in steel tube, to avoid due to the damage caused by stress corrosion, is advantageous to the field of welding construction at the same time;
4 ,to 9 100% of steel pipe quality inspection, make the whole process of steel pipe production are under effective detection, monitoring, effectively ensure the product quality.
5 ,the whole production line all equipment with the function of the computer data acquisition system networking, realize the data real-time transmission, by the central control room for production.
2016/12/25
Shinestar Won 2016 Alibaba Hundreds of Millions ISPS Award
Shinestar Won 2016 Alibaba Hundreds of Millions ISPS Award
Dec 23, 2016, looking for new foreign trade in Hunan and 2016 annual Hunan network business awards ceremony held in Changsha, about a hundred foreign trade enterprises attended the meeting, Shinestar won 2016 "Hundreds of Millions ISPS Award ", the Executive Director of Shinestar Wang Li was invited to attend and receive the award.
The awarding activity is hosted by the Kaifu District People's Government, supported by Alibaba. The activities summed up the development of 2016 Hunan foreign trade business model, commended some foreign trade enterprises' outstanding achievement in e-commerce. It has promulgated the "Annual Top Ten ISPS," "Special Contribution Award", "Ten Million ISPS Award" and "Hundreds of Millions ISPS Award " and other eight awards. Shinestar won "Hundreds of Millions ISPS Award " with excellent sales performance, as well as the special contributions to develop Hunan e-commerce, which has been warmly concerned by the on-the-spot guest.
Shinestar is based in China,service global production of large steel enterprises, is committed to global customers with high quality steel products and services.In 2016, although the environment is not good, many companies have encountered had difficulties and challenges, but Shinestar has successfully bucked the trend,Steel sales exceeded 4 billion yuan, more gains of the 2016 "Hunan top 100 enterprises "award.Behind these achievements, the role played by e-commerce is pivotal. E-commerce for Shinestar to create more business opportunities to help brands better open visibility, but also to bring effective and convenient management of the Shinestar, in terms of reducing the cost of marketing is playing a significant role.
Shinestar Steel Group CEO Wang Li said Shinestar either from capital investment or talent reserves have attached great importance to the development of E-commerce, has achieved preliminary results,2016 through the electric business platform for sales performance is proved by leaps and bounds.But e-commerce in the steel industry is still in the early stages of development, great potential, in the end how to do, how to do a good job, is a very worthy of study. Shinestar also in unceasing exploration, hope can be in the future and electricity business elite, industry experts to explore and research.
The Shinestar won "Hundreds of Millions ISPS Award " honor,both a positive result of the past, but also an encouragement for future development. Shinestar will take this as a new starting point, continue to promote the development of e-commerce, and continuously enhance the core competitiveness of enterprises.To create "century of steel enterprises in the field of overall service bench marking", and continuous efforts.
Shinestar Won 2016 Alibaba Hundreds of Millions ISPS Award
Shinestar Won 2016 Alibaba Hundreds of Millions ISPS Award
Dec 23, 2016, looking for new foreign trade in Hunan and 2016 annual Hunan network business awards ceremony held in Changsha, about a hundred foreign trade enterprises attended the meeting, Shinestar won 2016 "Hundreds of Millions ISPS Award ", the Executive Director of Shinestar Wang Li was invited to attend and receive the award.
The awarding activity is hosted by the Kaifu District People's Government, supported by Alibaba. The activities summed up the development of 2016 Hunan foreign trade business model, commended some foreign trade enterprises' outstanding achievement in e-commerce. It has promulgated the "Annual Top Ten ISPS," "Special Contribution Award", "Ten Million ISPS Award" and "Hundreds of Millions ISPS Award " and other eight awards. Shinestar won "Hundreds of Millions ISPS Award " with excellent sales performance, as well as the special contributions to develop Hunan e-commerce, which has been warmly concerned by the on-the-spot guest.
Shinestar is based in China,service global production of large steel enterprises, is committed to global customers with high quality steel products and services.In 2016, although the environment is not good, many companies have encountered had difficulties and challenges, but Shinestar has successfully bucked the trend,Steel sales exceeded 4 billion yuan, more gains of the 2016 "Hunan top 100 enterprises "award.Behind these achievements, the role played by e-commerce is pivotal. E-commerce for Shinestar to create more business opportunities to help brands better open visibility, but also to bring effective and convenient management of the Shinestar, in terms of reducing the cost of marketing is playing a significant role.
Shinestar Steel Group CEO Wang Li said Shinestar either from capital investment or talent reserves have attached great importance to the development of E-commerce, has achieved preliminary results,2016 through the electric business platform for sales performance is proved by leaps and bounds.But e-commerce in the steel industry is still in the early stages of development, great potential, in the end how to do, how to do a good job, is a very worthy of study. Shinestar also in unceasing exploration, hope can be in the future and electricity business elite, industry experts to explore and research.
The Shinestar won "Hundreds of Millions ISPS Award " honor,both a positive result of the past, but also an encouragement for future development. Shinestar will take this as a new starting point, continue to promote the development of e-commerce, and continuously enhance the core competitiveness of enterprises.To create "century of steel enterprises in the field of overall service bench marking", and continuous efforts.
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