SSAW Pipe

 Spiral pipe, also known as spiral steel pipe, is a kind of tubular steel made of low carbon steel or low alloy steel through spiral welding process. Spiral pipe has the characteristics of high strength, good bearing capacity and excellent welding performance, so it has a wide range of applications in infrastructure construction, industrial production and other fields. This article will detail the main uses of spiral tubing. 1. Urban infrastructure construction Water conservancy projects: Spiral pipes play an important role in water conservancy projects and can be used in water pipelines, drainage pipes, irrigation projects and other fields to meet the needs of urban water supply, drainage and farmland irrigation. Heating engineering: Spiral pipes have good heat conduction performance in heating engineering, and can be used as the main pipeline for central heating and district heating systems. Gas transmission: spiral pipes can be used as urban gas transmission pipelines to transpo...

 Spiral welded pipes (SSAW) for water conservancy projects are generally spiral welded steel pipes with relatively large diameters, because the water passing through per unit time is large, which can greatly improve work efficiency. Since the inner wall of the spiral steel pipe is constantly washed by water, the inner wall is generally not treated with anti-corrosion treatment, but the exterior is generally in the form of overhead, so anti-corrosion needs to be done to deal with rain erosion and sun exposure, so the requirements for anti-corrosion coatings are higher. Before anticorrosion of spiral steel pipes for water conservancy projects, the surface of the steel pipes should be sandblasted, and the grade should reach st2.5. After sandblasting, apply the anti-corrosion primer immediately. The anti-corrosion primer is generally epoxy zinc-rich paint with a zinc content of 70% or more, the middle is epoxy mica paint, and the outermost layer is anti-oxidation and corrosion. Polyure...

When making the anti-corrosion spiral steel pipe (SSAW), the inner and outer surfaces of the spiral steel pipe need to be sandblasted first, and then the inner wall is coated with primer, after the primer is dried, the intermediate paint is applied, and the intermediate paint is dried before applying the topcoat. After the inner wall is finished, the anti-corrosion layer treatment of the outer wall is carried out, and the production method is the same as that of the internal anti-corrosion. Internal and external precision welding of spiral steel pipe → flat chamfering of pipe end → ray and ultrasonic testing → hydraulic test → internal and external shot blasting and rust removal → intermediate frequency heating → internal epoxy powder coating → external 3PE coating extrusion winding, the anti-corrosion steel pipe is completed. The production process steps of the outer anti-corrosion layer of the spiral steel pipe are as follows: The surface of the steel pipe should be pretreated accord...

 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...

 The busy Spring Festival holidays quietly went, and we also officially started construction on February 12. New Year's New Meteorology, from the beginning of 2019, according to statistics, Xinyue export orders have exceeded 20,000 tons. Prosperity, every Xinyue person is actively working hard. In the last few days before the holidays, we also finalized our cooperation with Southeast Asia Petro once again. After one month's negotiation, the project ordered 600 tons of spiral steel pipe. From the supplier qualification audit to product technical documents audit, Xinyue has always been the first choice for customers. Compared with the straight submerged arc steel pipe, the pipe specifications are more in line with the production process of spiral steel pipe. After submitting a series of successful project documents for the second largest oil company supplying for Venezuela, Australia, Pakistan and Greece, Xinyue finally gained the trust of the end customers and won the project fr...

 In October 2019, We received an EN10219-S355 spiral pile pipe inquiry. The client requires that the first offer must be very competitive. Spiral pile pipe is one of the products that Xinyue is best at. After analyzing the use of pile pipe, we gave a complete quotation and shared related pile pipe projects we have done over the years. The customer was very satisfied with our price and experience, and asked us to provide sample MTC and ITP. The customer company also quickly reviewed our technical documents and factory qualifications, and provided the quotation to the project contractor. After three months of intimate service, the customer finally won the project in January 2020 and signed a contract with us before the Chinese Lunar New Year. Considering that the Spring Festival holiday will affect customer delivery, we purchased raw materials before our CNY. However, as China celebrated the New Year, a new corona virus broke out in Wuhan, which also affected other cities in China, f...

 　　1.Main types of anti-corrosion spiral steel pipe: 　　Common forms of anti-corrosion spiral steel pipes are mainly 3PE anti-corrosion, epoxy resin anti-corrosion, cement mortar anti-corrosion and epoxy coal asphalt anti-corrosion. 　　2.Main features of anti-corrosion spiral steel pipe: 　　3PE anticorrosion is mainly for oil and natural gas pipelines, because oil and natural gas pipelines require high price comparison, 3PE anticorrosion can generally increase the life of the pipeline to about 30-50 years. 　　Epoxy resin anticorrosion is mainly for drinking water pipelines. Because epoxy resin is a non-toxic raw material, it is often referred to as non-toxic drinking water pipelines. There are many types of corrosion media in the IPN8710 anti-corrosion spiral steel pipe, including acids, alkalis, salts, oxidants, and water vapor. The coating must be chemically inert and resistant to acid and alkali corrosion. The coating film should be dense in structure, have good waterproof permeabil...

　　Spiral steel pipe is also called a spiral steel pipe, which is generally referred to as a spiral steel pipe with a diameter of more than 1 meter. Steel pipes are subject to water pressure, tortuosity and pressure. Flat and other experiments have certain requirements on the surface quality. The general delivery length is 12 meters, often requiring fixed delivery. A metal material with a yielding phenomenon, the stress of the sample is not added (persistently stable) during the stretching process, and the stress at the time of elongation is continued, which is called the yield point. 　　If the force attack declines, the upper and lower yield points should be distinguished. The unit of the yield point is N/mm2 (MPa). The sample is connected during the stretching process. The maximum force (Fb), the stress (σ) obtained from the original cross-sectional area (So) of the sample, is called the tensile strength (σb), and the unit is N/mm2 (MPa). It shows the maximum ability of metal materia...

　　At present, the most common method of pipe cutting by spiral steel pipe manufacturers is that the plasma is cut. When cutting, a large amount of metal vapor, ozone, and nitrogen oxide dust will be generated, which will seriously pollute the surrounding environment. The key to solving the soot problem is how to inject all the plasma dust into the dust removal equipment to prevent air pollution. 　　For plasma cutting of spiral steel pipe, the difficulty of dust removal is: 　　1. When the nozzle of the plasma gun is cut, the air is blown out in two opposite directions at the same time, so that the smoke emerges 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 well. 　　2. The cold air around the suction port enters the suction port from the outside of the machine and the air volume is large, so that the total amount of smoke and cold air in the steel pipe is larger than the effective air volume sucked...

　　3PE anti-corrosion steel pipe base material includes seamless steel pipe , spiral steel pipe and straight seam steel pipe. The three-layer polyethylene (3PE) anti-corrosion coating has been widely used in the petroleum pipeline industry for its good corrosion resistance, water vapor permeability and mechanical properties. 3PE anti-corrosion steel pipe An anti-corrosion layer is very important for the life of buried pipelines. Some pipes of the same material are buried in the ground for decades without corrosion, and leaks occur in some years. It is because they use different outer coatings. 　　Steel pipe outer wall anti-corrosion form 　　3PE anti-corrosion generally consists of three layers of structure: 　　A layer of epoxy powder (FBE>100um) 　　Two-layer adhesive (AD) 170～250um 　　Three layers of polyethylene (PE) 1.8 ~ 3.7mm 　　In the actual operation, the three materials are mixed and integrated, and processed to make it firmly combined with the steel pipe to form an exce...

　　There is a certain relationship between the service life of the spiral steel pipe and the surface decarburization of the spiral pipe. If the surface is decarburized, the strength and wear resistance of the spiral steel pipe will be reduced, which directly affects the service life of the spiral steel pipe. If the decarburized layer on the spiral pipe is not cleaned, the surface layer hardness and wear resistance of the spiral steel pipe will be correspondingly reduced, and in the process of quenching, the surface of the workpiece will be caused by the change of the volume of the inner and outer layers. A crack is formed. 　　In order to solve the decarburization problem of the surface, the heat treatment process is mainly processed because the decarburization and the oxidation of the spiral steel pipe are simultaneously performed. Therefore, in the process of heat treatment, the spiral steel pipe should not be in contact with the air as much as possible. This can improve the phenomeno...

　　Spiral steel pipe is a spiral seam steel pipe which is made of steel coiled coil as raw material, which is often heated and extruded, and welded by automatic double wire double-sided submerged arc welding process. 　　1. The raw materials are strip coils, welding wire, flux. Before the input, it is subject to strict physical and chemical tests (Q345B is taken as the first letter of the Q-type Chinese pinyin of the Q-steel's yield strength; 345—yield strength value, in MPa; B—quality grade is B.) . 1 Q345B chemical composition C: ≤ 0.20%, Si ≤ 0.50%, Mn: ≤ 1.70%, P ≤ 0.035%, S: ≤ 0.035%, Nb ≤ 0.07%, V: ≤ 0.15%, Ti ≤ 0.20%, Cr ≤ 0.30%, Ni: ≤ 0.50%, Cu: ≤ 0.30%, N: ≤ 0.012%, Mo: ≤ 0.10%; 2 Q345B mechanical properties yield strength: ≤16mm: ≤345,16-40mm: ≤335,40-63mm: ≤325,63-80mm:≤315,80-100m:≤305,100-150mm:≤285,150- 200mm: ≤275. Tensile strength: 450-630. Elongation: greater than 17. Impact test: Test temperature: 20 ° C: greater than 34. 　　2. The strip head and tail butt joint, ...

　　Production process of spiral steel pipe is complex, but it is one of the most popular steel pipes because it can be used widely. Spiral steel pipes are produced through welding process, then what issues should be noticed in the welding process? 　　Straight seam welded pipes are simple-produced with high efficiency, low cost and rapid developed. The strength of the spiral welded pipes is generally higher than that of seam welded pipes and narrow billet can be used to produce larger diameter welded pipes, besides, the same width billet can be used to produce welded pipes of different diameter. But compared with straight seam pipes of the same length, weld length increases by 30 ~ 100%, and production speed is lower. As a result, small diameter welded pipes mostly adopt straight seam welding, while large diameter welded pipes mostly adopt spiral welding. 　　Notes in the process of spiral steel pipe welding 　　From the aspect of economic benefit, pipe fittings of spiral steel pipes s...

　　The spiral tube is known as a pipe for transportation. Although it does not have the same pressure resistance as a seamless steel pipe, it can play a significant role in the construction of water supply and water supply. Spiral steel pipes are also very useful in the collection of heating in the city. Let us know. 　　The spiral tube gathers heat. The steam and hot water generated by the collecting heat source are supplied to the city or some areas for heating and heating through the pipe network. It consists of heat source, heat network and heat user. 　　The spiral tube gathers heat for heating is one of the basic equipments of the city. It has the economic benefits, environmental benefits and social benefits of saving power, reducing pollution, facilitating production and facilitating the day. The principle and principle of urban heating promotion to gather heat supply is to insist on tailoring, wide open heat source, advanced technology and economical rationality. Strictly restri...

　　SSAW steel pipe itself has no life limit, and the service life is mainly related to the operating environment and production process. Spiral steel pipe operating environment is relatively poor In order to extend the service life, the outer wall and inner diameter of the steel pipe are preserved. 　　Anti-corrosion steel pipe refers to a steel pipe that has been treated by anti-corrosion technology and can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reaction during transportation and use. The anti-corrosion steel pipe can effectively prevent or slow down the corrosion and prolong the service life of the steel pipe and reduce the running cost of the steel pipe. 　　There are many steel pipeline anti-corrosion coatings in China, such as petroleum asphalt, PE jacket and PE foam jacket, epoxy coal tar pitch, coal tar enamel, epoxy powder and three-layer composite structure, and epoxy coal tar pitch cold-wrapped belt (PF type). , rubber-p...

　　Spiral welded steel pipes are widely used in oil, natural gas, water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range. 　　a. Molding process, the steel deformed uniformly, spiral steel pipe , residual stress, the surface does not produce scratches.Spiral steel pipe processing diameter and wall thickness in the range of sizes for greater flexibility, especially in the production of high grade thick-walled pipe, spiral steel pipe, especially small and medium-diameter thick-walled tube has advantages over other processes,to meet user specifications in steel demand more. 　　b. The use of advanced double-sided submerged arc welding process, welding can be achieved in the best position, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality. 　　c. 100% of the steel quality inspection, so that the whole ...

　　In the process of loading and unloading, spiral steel pipe damage is inevitable, and some measures and methods need to be taken to ensure this situation. The details are as follows: 　　1. Spiral steel tube packing should be able to avoid loose and damaged during normal handling, transportation and storage. 　　2. If the demand side has special requirements for the packing materials and packaging methods of spiral steel pipes, it shall be specified in the contract; if not specified, the packaging materials and packaging methods are provided by the supplier. 　　3, Packaging materials should comply with the relevant provisions. If no packaging material is required, it should meet the intended use, avoid waste and cause environmental pollution. 　　4. If the customer requests that the spiral steel pipe cannot be damaged by bumps on the exterior, consider using a protective device between the spiral steel pipes. Protective equipment can use rubber, straw rope, fiber cloth, plastic, caps...