SSAW Pipe

　　At present, the stainless welded steel pipes are drawing the attention of more and more users and relevant departments. The stainless welded steel pipes are the main pipeline corrosion materials in the field of the petroleum, the chemical, the pharmaceutical, the food and other industries. And the stainless welded steel pipes are also major components of the power generation equipment, the ship industry, the refrigeration equipment and the desalination equipment. 　　With the rapid development of the domestic economy, the demands for the stainless welded steel pipes are increasing significantly as time going by. For the time being, the stainless welded steel pipes are used in the urban landscape and the architectural decoration industry. The performance requirements of the industrial welded steel pipes are relatively high, but now the domestic production technology is not yet mature. So far, most of the stainless steel pipes in use are imported from other countries. 　　But in recen...

　　The production process of cold-rolled seamless steel pipe is generally more complicated than that of hot-rolled: tube is first to three roller skew rolling, then, to carry out a sizing test after extrusion. Round tube needs to cut through cutting machine and the length is about 1 meter. Entering the annealing process, annealing carry out pickling should pay attention to whether the surface has a large number of foaming, if there is a large number of bubbles produced that the quality of the steel pipe is not up to the corresponding standard. Cold-rolled seamless steel pipe is shorter than the hot rolled seamless steel pipe in appearance, but the surface looks brighter than the thick walled seamless steel tube. 　　Advantage of cold-rolled seamless steel pipe: 　　Forming fast, high yield, and no damage to the coating, it can be made into a variety of cross sectional form to meet the needs of the use of conditions; Cold rolling can cause great plastic deformation, so as to improve the...

　　As the development of pipe industry, pipe and pipe fittings, including pipe coupling, pipe tee, pipe elbow are more and more widely use in industrial area. There are four types of carbon steel pipe that are mostly used, and Prime Steel Pipe as an excellent steel pipe manufacturer of China, has 24 years expenrience to produce high quality carbon steel pipe. If you have any requirement of carbon steel pipe, you can contact us right now. 　　1. Welded steel pipe: it is also called welded pipe. It is shaped by steel plate or steel strip through bending and then welding. It is divided into seam welded pipe and spiral welded pipe. According to the application, it is divided into general welded pipe, galvanized welded pipe, oxygen blowing metric welded pipe, welded pipe, wire casing, roller tube, deep well pump pipe, auto tube, transformer, electric welding thin wall pipe, welded pipe and spiral welded pipe. 　　2. General welded pipe: general welding work for low pressure liquid. It uses ...

　　 Seamless steel pipe is one of the important products in OCTG products. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and construction of steel scaffolding and so on. Comparing with the other steel pipe, seamless steel pipe has stronger anti-bending and torsional ability under the condition of the same cross section area. It is widely used in the national economy, and is entitled to the "industrial blood vessel". Therefore, the quality of seamless steel pipe has very demanding requirements. Geometry inspection is one of the seamless steel pipe inspection. It include: 　　Seamless steel pipe wall thickness inspection Micrometer is the main tool that is adopted. When you check, left hand holds the micrometer stand, with right hand rotation induced wheel, and the wire rod should be coincident with the diameter of the measuring point. Once found that the wall thickness is not ...

　　OCTG casing and tubing is a kind of popular steel pipe in the steel industry, but there occurs decarburization phenomenon for the OCTG tubing and casing. Then what do we take the measures to avoid decarburization for them? 　　Generally, there are two ways to avoid decarburization for OCTG casing and tubing. One is the common and simple way: make full use of nitrogen protective to sustain the pressure inside the furnace. According to proportion, workers can join or inject into the neutral nitrogen to the furnace, which will not only prevent the outside air decomposing into oxygen and water vapor into the debris but also disperse the gas existing oxidation in furnace effectively. Without reaction medium with the surface of carbon, decarburization would not happen and the area of the decarburization also can be reduced generally. 　　Another way is to make the balance to control furnace carbon dioxide levels according to the OCTG tubing and casing workpiece. Expert research if the bal...

　　Press LSAW steel pipe and spiral welded pipe is divided into Longitudinal. Longitudinal simple consumer technology, consumption and high efficiency, low interest rates, to carry out fast. The strength of spiral steel pipe common than straight seam high, can narrow the larger diameter structural steel pipe billet consumption, but also the width of the blank with the same consumption of different diameter pipe. But with the same length of straight seam pipe compared to the weld length of 30 to 100% and the consumption rate is low. Thus, the smaller diameter pipe actually use straight seam steel pipe, large diameter spiral welded pipe is mostly used. 　　Welded steel pipe issteel or steel plate with a bending round, square and other shape and then welded into the surface of the pipe joints. Welded steel consumption process is simple. Types of specifications, equipment, less capital, but the average strength of less than seamless. Since the 1930s, with the consumption of high-quality st...

　　Hot rolled is relative to the cold-rolled, cold rolling is below the recrystallization temperature of the rolling, and hot rolled is carried out at above the recrystallization temperature of the rolling. 　　Advantages 　　Hot rollded seamless steel pipe can damage the cast microstructure of the steel ingot, refinement of the crystal grains of the steel, and eliminate the defects of the microstructure, so that the the steel organization compacting, improve the mechanical properties. This improvement is reflected in the rolling direction, so that the steel is no longer to a certain extent isotropic; pouring the formation of bubbles, cracks, and osteoporosis, under high temperature and pressure can also be welded together. 　　Disadvantages: 　　1. After the hot rolling, the nonmetallic inclusions in the interior of a steel (mainly sulfides and oxides, as well as the silicate) was pressed into a sheet, stratified (laminated) phenomenon appears. The layering of the steel in the thickne...

　　 High pressure boiler tube hardness testing should take into account its mechanical properties, which is related to stainless steel as raw material for the deformation, such as punching, cutting processing performance and quality. 　　Therefore, all of the high-pressure boiler tubes need to conduct mechanical tests. Mechanical performance testing method is mainly divided into two kinds, one kind is tensile test, the other kind is usually hardness test. 　　Tensile test is the high pressure boiler tube sample, high pressure boiler tube tend to sample to the fracture on tensile testing machine, mechanical properties and determination of one or more, usually only determination of tensile strength, yield strength, break elongation, and reduction of area. Tensile test is the most basic mechanical properties of metallic materials testing methods, almost all of the metal material, as long as the requirements of the mechanical properties of the high pressure boiler tube, the provisions of t...

　　Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe. 　　 Anti-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, steel pipes and other engineering fields. Anti-corrosion steel pipe is divided into the following categories: IPN8710 corrosion, FBE epoxy powder corrosion, 2PE/3PE corrosion, Coal tar epoxy anticorrosive, High-density polyethylene jacket corrosion 　　The processing standard: 　　1.The petroleum natural gas uses three polyethylene (3PE) Steel pipe anticorrosion 　　Standard: SY/T0413-2002\DIN30670-1999 　　2. fluming water, oil, gas Medium and so on use two, three polypropylene (PP) anticorrosion 　　Standard: DEP 31.40.30.31 　　3. The petroleum natural gas uses FBE(Single-layer nodulizing epoxy powder anticorrosion) 2FBE(Double-decked no...

　　The use and use value of alloy tube materials are mainly determined by their properties, and the main factors affecting their properties are their composition and structure. The research on alloy materials with low melting point and high strength can be divided into two aspects: one is to add trace elements to the existing alloys to increase the strength while maintaining the melting point unchanged; the other is to prepare new alloy tubes to adjust the composition and proportion of alloys to achieve the purpose of improving the properties of alloys. Generally, non-ferrous metals (alloys) have the following ways to improve their strength: 　　(1) Solid solution strengthening is to increase the strength of the material by forming a solid solution, and to improve the hardness and strength of the solid solution by the action of the solute element. At present, the development trend in this area is to improve the performance by adding a small amount of multi-elements. In the same metal ma...

　　Low carbon steel pipe known as mild steel pipe and carbon content from 0.10% to 0.30% in low-carbon steel is easy to accept all kinds of processing such as forging, welding and cutting, commonly used in the manufacturing chain, rivets, bolts, axis. The carbon content of less than 0.25% carbon steel, because of its low intensity, low hardness and soft, it is also known as mild steel pipes. It includes the majority of ordinary carbon steel pipe and part of high-quality carbon structural steel, mostly used in engineering structures without heat treatment, and some by carburizing and other heat treatment is used for wear-resistant mechanical parts. 　　Low carbon steel pipe annealed structure of ferrite and pearlite, the lower its strength and hardness, good ductility and toughness. Therefore, the cold good formability and can use methods such as crimping, bending, stamping, cold forming. This structural steel pipe has good weldability. Low carbon content of low carbon steel hardness is ...

　　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, ...

　　 Boiler steel pipes includes medium pressure boiler pipe and high pressure boiler pipe, it is often manufactured in seamless procedures, welded steel pipe is not applicable. It has been widely used at heat exchanger pipe and tubing services, tube exchanger bundle, high pressure boiler, economizer, super heater, petrochemical industry pipes, etc. 　　Based on different working temperature, the medium or high pressure boiler pipe shall be used. Normally classified as below cases: 　　1. The operation temperature of general boiler pipe is lower than 450℃. The medium pressure boiler pipeline mainly adopts hot rolling process or cold drawing process. 　　2. High pressure boiler pipes are often used in high temperature and high pressure conditions. Under the action of high temperature flue gas and steam, the pipe will occur oxidation and corrosion. It is required high pressure boiler pipe that has high durable strength, high oxidation corrosion resistance and good tissue stability.

　　Heat treatment is a method of changing the physical properties of high pressure boiler pipe by heating and cooling. Heat treatment can improve the microstructure of high pressure boiler pipe, so as to meet the required physical requirements. Toughness, hardness and wear resistance are obtained by heat treatment. In order to obtain these characteristics, it is necessary to adopt quenching, annealing, tempering and surface hardening. 　　a. Quenching 　　Hardening, also called quenching, is that high pressure boiler pipe is heated evenly to the appropriate temperature, then quickly immerse in water or oil for rapid cooling, and cooling in the air or in the freezing zone. So that the high pressure boiler pipe can obtain the required hardness. 　　b. Tempering 　　High pressure boiler pipe will become brittle after hardening. And the stress caused by quenching can make the high pressure boiler pipe tapped and broken. The tempering method can be used to eliminate brittleness. Although th...

　　The major making techniques of seamless steel pipes are as follows. 　　1. Plug Rolling Production 　　Production equipments consist of punching machine, automatic pipe rolling mill, reeling mill, sizing mill and the reducing mill. Pierce the round tube into the hollow of thick walled tube, and the axis of two rollers and rolling lines form a slant angle. in recent years the slant angle has increased from 6 ° ~ 12 ° to 13 ° ~ 17 °, promoting the punch speed. Use secondary perforation to reduce the thickness of the hollow billet walls when produce structural steel pipe of more than 250mm diameters. The development of new technology also has been made, which strengthened the perforation process and improve the quality of the capillary. 　　2. Continuous Rolling Production 　　Production equipments consist of punching machine, continuous rolling mills, and tension reduction mills. Pierce round base into hollow billet and then insert the mandrel, through continuous rolling of 7 ~ 9 two-...

　　1) The seamless pipe is a long strip of steel with a hollow section and no joints around it. It is a steel pipe without seams, hot rolling or cold drawing process. Seamless steel pipe characteristic is that its pressure endurance is fairly good. 　　2) Welded steel pipe, also called welded pipe, is a steel pipe made by welding a steel plate or a strip steel after being crimped. Can be divided into straight seam welding and spiral seam welded steel pipe. More than an inappropriate example, you roll rectangular white paper into a tube, and then the edge is welded is a straight seam welded pipe, if you roll up and then welded, it is a spiral seam welded steel pipe. The welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, the strength is generally lower than that of the seamless steel pipe, more than 800mm are welded steel pipes, which are welded by steel plates, which is determined by the current state of the art. 　　3) Featu...

　　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...

　　Cold rolled seamless pipes(GB3639-2000)are cold drawn or cold rolled precision seamless steel pipes with high accuracy of the dimension and good finish of the surface used for the machinery and hydraulic equipment. The cold rolled process refers to the method adopted to process the steel plates or strips into various types of steel products by cold working processes such as the cold bend and cold drawn processes. Cold rolled seamless pipes not only include general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes , stainless steel pipes, petroleum cracking steel pipes, but also include carbon steel pipes with thin walls, alloy steel pipes with thin walls, stainless steel pipes with thin walls and special-shaped steel pipes. The hot rolled seamless pipes usually have outer diameter larger than 32mm and wall thickness between 2.5mm to 75mm; the cold rolled seamless pipes usually have the outer diameter less than 6mm and wall th...

　　Straight seam welded pipe (ERW straight seam welded steel pipe) is formed on the hot rolled plate of the forming machine, the skin effect and proximity effect of the high frequency current, melting of the pipe edge heating to the extrusion roller pressure welding to achieve production. The application of high-frequency resistance welding method in pipeline production in the 1950s has witnessed more and more mature production technology and continuous improvement of product quality in the past decade or so. 　　First of all, in the quality of raw materials, the production of ERW steel pipe has been significantly improved, the composition of the steel design of low carbon, low P, S, micro-alloying; smelting process smelting, ladle refining, vacuum degassing, continuous casting and other new technologies In addition to the ERW controlled rolling and cold rolling process, the technology has enabled the appearance size of the hot rolled steel strips of large and medium caliber ERW steel ...

　　Prepainted galvanized steel coil made of hot-dip galvanized sheet, hot-dip aluminum zinc plate, electro-galvanized sheet, after surface pretreatment (chemical degreasing and chemical conversion treatment). Prepainted galvanized steel coil is coated with layers of organic paint, and then baked, through the curing process. This steel plate has bright appearance, which has good performance of a variety of materials. 　　Prepainted galvanized steel coils not only greatly improve the chemical stability of the material, but also have more effective anti-rust and anti-corrosion properties. The extensive applications of prepainted galvanized steel coil also depends on its good performance, high quality prepainted galvanized steel coil is coated with high strength steel materials, and easy to shape. 　　It is worth to mention that all the raw materials used in the production of prepainted galvanized steel coils are environmentally friendly materials, whether it is the production or later use...