steel tube

　　After the stainless steel hot-rolled coil is pickled, a strip of 8-18 mm wide and long strips is commonly found on both sides of the strip, which is called a side turn. Since the rollover cannot be eliminated after cold rolling, it directly affects the surface quality of the cold rolled product, so it is generally trimmed and delivered. In actual production, the width of the rollover should be controlled as much as possible. 　　 Mechanism and causes of rollover formation: 　　1, Because the large surface of the continuous casting slab is sharpened after grinding, and the side is not ground, after heating and oxidation, the side is rough. After rough rolling, the four corners and the unground metal are extended to the surface. Forming a rollover; 　　2, The rough rolling vertical roller wears large, and the width of the rollover is widened quickly; 　　3, The width of the blank material fluctuates greatly, and the trapezoidal direction in the longitudinal direction causes the vertica...

　　The use of seamless steel pipe is very wide, such as natural gas pipeline, oil companies, chemical companies, power pipes, heat pipes, water supply and drainage pipes, steam heating, hydro power station pressure pipe, thermal power, water and other long-distance pipeline and piling, bridges, steel and other engineering fields. 　　1. GB/T8162-2008 (structural seamless steel pipe with galvanized steel pipe) is mainly used in general structure and mechanical structure. Its representative material (grade) is: carbon steel, 20,45 steel, alloy steel Q345, 20C galvanized steel pipe, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on. 　　2. GB/T8163-2008 (seamless steel pipe for transporting fluid) is mainly used for engineering and large equipment on the delivery of fluid pipelines. On behalf of the ceramic composite pipe material (grade) is 20, Q345 and so on. 　　3. GB/T3087-2008 (low and medium pressure boiler seamless steel pipe) is mainly used for industrial boilers and live boilers transpor...

　　There are two modes of seamless steel pipe production, hot rolled and cold rolled, and there is a slight difference between two approaches. Next, Prime Steel Pipe will introduce those respectively for all of you. 　　Hot-rolled seamless steel pipe production process: 　　1. Hot-rolled (extruded seamless steel pipe): round tube → heating → perforation → three roll inclined rolling, rolling or extrusion → release → sizing (or reducing diameter) → cooling → straightening → water pressure test (Or flaw detection) → mark → storage 　　Cold-rolled seamless steel pipe production process: 　　2. Cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → start → annealing → pickling → oil (copper) → multi-pass cold drawn (cold-rolled) → billet → heat treatment → straightening → water pressure test (flaw detection) → mark → storage 　　Prime Steel Pipe has over 20 years to manufacture seamless steel pipe, we can provide the highest quality and the best price. If you are inte...

　　Defects on the seamless steel pipe internal and external surface have a great influence on the performance of high-pressure boiler tubes using. As a leading seamless steel pipe manufacturer, Prime Steel Pipe will adopt some measures to control quality in the production process of seamless steel pipe. 　　1, Add hot ingot, billet surface and perforation of the capillary inner and outer surfaces are determined by the shortage tube outer diameter surface, remove oxide skin, eliminating the resulting scarring and other defects. 　　2, Use high-quality work, excellent mold and process for lubrication to prevent sticking during rolling of steel, defects, excessive wear and other phenomena, to eliminate the resulting straight, scratching, rolling off, cracks and other defects. 　　3, Use protective gas heat pipe. No shielding gas should be heat-treated steel shot blasting, sanding, etc. Overall, the surface of iron oxide to eliminate defects and improve surface quality and ease of surface ...

　　There are more and more people choose to use carbon steel pipe in the construction. Why? Next, Prime Steel Pipe will show you some advantages of carbon steel pipe for all of you. 　 　A.Safe and durable 　　We all know that steel is a frequently-used material because it is durable and safe. Since steel is non-combustible and makes it harder for fire to spread, it is good to use when building homes. Carbon steel pipe is highly resistant to shock and vibration. Fluctuating water pressure or shock pressure from a water hammer have little effect on steel. And carbon steel pipe is practically unbreakable in transport and service, and for this reason it is okay to lay water mains under roadways. 　 　B. Environmental protection 　　Using steel for pipes is not only safer for people, but it is safer for the earth. Steel can be recycled. Each year, about 70 percent of all steel is recycled in North America, more than paper, aluminum, plastic and glass combined. Steel products can be recycle...

　　In order to improve the seamless steel pipes for oil transportation, usually the surface should be treated for corrosion resistance. Common treatments include: cleaning, descaling, pickling, shot blasting four methods. 　　1. Cleaning. The grease, dust, lubricants, organic matter on the surface of seamless steel pipes usually can be cleaned by solvent or emulsion. But for rust, scale, welding slag can not be removed, that will need further process. 　　2. Remove rust by tools. Use a wire brush to polish the oxidation, rust, welding slag on the surface of seamless steel pipes. Tools can be divided into manual and power tools. Manual tools can reach class 2 level, power tools can reach class 3 level. For stubborn scale, it is possible can not be removed by tools, that will need further process. 　　3. Pickling. Common pickling include chemical and electrolytic methods. However, the corrosion resistance for seamless steel pipe should be chemical pickling. Chemical pickling steel surfac...

　　 Galvanized steel pipe is a steel pipe that has been coated with zinc. This coating protects the steel from corrosion. It is most commonly used for outdoor construction like fences and handrails, or for some interior plumbing. It is also sometimes called galvanized iron pipe. Do you kown the reason why is so popular? 　　Below is three main using advantages of Galvanized Steel Pipes you might want to know: 　　1. After being hot-dip galvanized, the pipes of the surface will be protected well. Compared with other type of coating process, deepen the zinc is easier to let the coating covered well. 　　2. Because the zinc coating has a larger hardness value than steel pipes. After being galvanized, the impact resistance and anti-ware properties of the steel pipes has increased. 　　3. In general, the zinc layer at the pipe ends will be relatively thicker than other type of coatings. Therefore, it offers better toughness and abrasion resistance to the Galvanized Steel Pipes.

　　When purchasing steel pipe fittings, it’s important to take into consideration certain factors, most importantly size and shape, to ensure that it is a perfect match for your specific purpose. However, another important aspect to consider is the material used in the making of the pipe fitters. Certain elements added to the steel, such as carbon and chrome, can dramatically affect its strength and appearance. Here are a few great reasons to invest in carbon steel pipe fittings as well as chrome plating. 　　Durability 　　Steel is one of the most popular types of pipe fittings and has been used for construction of pipes and pipe fittings for years because of its durability and strength. However, carbon steel, or plain-carbon steel, has the ability become much stronger through heat treatment. The more carbon added to the steel, the stronger it can become, which is why it is considered one of the strongest types of steel. Another way to increase the durability is to create a harder sur...

　　Black steel pipe and galvanized steel pipe are the two most common kind of pipe applied to transport liquid and gas. They have several respects similar to each other and many people confuse one to the other one. What is the main difference between black steel pipe and galvanized steel pipe ? Black steel pipe and galvanized pipe are made of steel, but galvanized pipe has a zinc coating while black pipe does not and therefore, galvanized pipe is more expensive and more durable. For transportation, black steel pipe tend to erode more easily than galvanized pipe and on account of this, it is more suitable for transporting gas and galvanized pipe is fit for carrying water instead of gas. 　　Galvanized pipe covered with a layer of zinc which makes it have higher ability of corrosion protection and help to prevent the accumulation of mineral deposits that will block the pipe. Galvanized pipe is mainly used for carrying water to supply home and commercial buildings; it is also serve as scaf...

　　Structural pipe is available in a variety of sizes and grades so that it can be used for a number of different structural uses and applications. Common uses for structural pipe include for columns, bollards, sign poles, structural supports, and piling. In general, structural pipe is a type of steel construction pipe that meets certain standards of chemical composition and mechanical properties. This pipe can be used for a wide variety of structural applications and there are variety of types of structural pipe available. 　　Common types of structural pipe include: 　　Seamless Steel Pipe: Seamless steel structural pipe is a durable pipe product that is commonly used for dock piling, pipe piling, caissons, and bollards. 　　ERW Steel Pipe: This structural pipe is typically known to the construction industry as high quality line pipe and it is commonly used by the oil and utility companies. This steel pipe can be used for sign pole, column, dock, and tunnel construction. 　　Spiral S...

　　Steel pipe unit weight (kg/m or lb/ft) is an important description that shall be specified in the purchase order. Then how to calculate the steel pipe weight per foot or per meter? 　　Through pipe weight and total quantity meters we will get the whole weight for the pipe request. Steel pipe unit weight is another way to express the pipe size schedule, calculate the maximum pressure of the pipe, and do the budget for the whole line pipe project. 　　How to calculate steel pipe per foot or meter 　　Basically, there are two ways to calculate steel pipe weight per foot or per meter. 　　One is to calculate according a steel pipe weight formula. 　　Another way is to find from steel pipe weight chart. 　　How to calculate the weight of steel pipe by formula 　　The steel pipe unit weight (kg/m or lb/ft) shall be calculated according to below formula. 　　kg/m is kilograms per meter 　　lb/ft is pounds per foot 　　P1= t(D-t)*C 　　D is the specified outside diameter, expressed in milli...

　　 API 5L steel line pipe adopts different steel grades, generally are Gr.B, X42, X46, X52, X60, X70, X80. Some manufacturers are capable of manufacturing steel grade up to X100 and X120. As the steel line pipe grades higher, more strictly control on the carbon equivalent control, and higher mechanical strength performances. 　　More over, for the same grade API 5L pipe, seamless and welded chemical elements content is different, which welded pipe is required more strictly and lower on Carbon and Sulfur. 　　By different delivery condition, there are also As-rolled, normalizing rolled, thermomechanical rolled, normalizing formed, normalized, normalized and tempered, quenched and tempered. 　　For intermediate grades, API 5L pipe grade shall be in one of following description format: 　　1. The letter L followed by the specified minimum yield strength in Mpa. For example, L290 (X42) means the minimum yield strength is 290 Mpa. In case of PSL2 pipe, Suffix letter (R, N, Q or M) shall be...

　　The main applications of alloy steel pipes is power station, nuclear power plant, high pressure boiler, high temperature superheater and re-heater coil etc. of high temperature pipeline and equipments. 　　The advantages of alloy steel pipes: 100% recycled, it is suitable for the national strategy of environmental protection, energy-saving and resource-saving. Therefore, the national policy encourages the expansion of the high pressure alloy steel pipe applications. At present, the proportion of the total alloy steel tube is half of the developed countries. The applications of alloy steel pipe provide a broad space for the industry development. According to the research of the China association of special steel alloy pipe expert group, our country’s high pressure alloy steel pipe material demand grows by an average of up to 10-12%. 　　How do I choose which alloy steel to use? Selecting the right alloy for a specific application is vitally important in order to achieve a sustainable...

　　 Stainless steel pipes are used because of their corrosion resistance in a wide variety of service environments, usually without additional coatings. In certain circumstances, however, stainless steel components or structures may require a coated (paint) finish. Examples of this may include company colour schemes or logos, environmental blending and compatibility, and general aesthetic requirements. 　　Coating systems for stainless steels must be carefully selected to provide sufficient durability to meet the requirements of the service environment and its associated operating conditions. The combination of surface preparation and formulation of the paint system are key factors in meeting these objectives. In certain environments, localised breakdown of the coating can lead to corrosion, which may be more severe than that experienced with un-coated surfaces and may result in high, localised, rates of attack. 　　In general, stainless steels have flatter and smoother surfaces than c...

　　Oil and gas spiral steel pipe corrosion means to slow or prevent pipeline in internal and external medium under the action of chemical, electrochemical, or eroded by microbial metabolic activity and metamorphism. 　　First of all, to prevent third-party damage and oil and gas spiral steel pipe corrosion. Although assumes primary responsibility for third-party damage to subsea pipeline owner, it can not say nothing to do. Many countries of the laying of submarine oil and gas pipelines have stringent industry standards, such as burying insufficient proof would be difficult to provide adequate protection anchors, which requires pipeline owners guidance in strict accordance with industry standards in the laying process, meticulous to achieve adequate protection of the anti-anchor depth, while the laying of the competent authorities to deal with the construction quality oversight of those. In such a shallow Bohai Bay, for example, taking into account the characteristics of the seabed, th...

　　 1. Argon Arc Welding 　　 Stainless steel pipes need penetrated welding without oxide impurities, having small heat-affected as possible. Argon arc welding has tungsten inert gas shield and has stable adaptability, superior welding quality, excellent penetration property, therefore the production has been widely applied in chemical, nuclear and food process industries. 　　The slow welding speed is the major shortcoming of argon arc welding. In order to improve its speed, foreign professionals have researched and developed various methods, among that, the multi-electrode & welding torch method, which is developed from single electrode welding torch method, was into the real practice. In 1970’s, the German manufactures firstly adopted the multi-electrode & welding torch method to form elongated heat flux distribution and the welding speed was quickened significantly. Today, the three-electrode welding torch is the most commonly used method, the wall thickness can be over 2mm...

　　Composed piece of seamless steel pressure pipes are generally standard, so the pressure piping components are primarily designed selection, pipeline pressure levels to determine their standard of its standard level is determined. 　　Pipe pressure rating: usually determined by a common pipe fittings standard nominal pressure rating and wall thickness of the pipe pressure rating that can reflects the parameters characteristic called pipe pressure rating. The customary to simplify the description, often to the pipe fittings nominal level called pipeline pressure rating. Pressure levels to determine the basis for the design pressure of the pipeline, but also the core design. It is the pressure piping, pressure piping design stress check preconditions pressure pipeline is an important factor in investment in infrastructure and pipeline reliability impact. 　　Different materials, the mechanical properties are different, the temperatures are in the standard - the corresponding value on t...

　　 PE pipe is used in agricultural and industrial fields and is commonly used in the application of construction industry, such as drain-pipe buried in the ground, gas piping. PE pipe is mainly used for urban gas supply, urban water supply, and farmland irrigation conservancy, etc. 　　Main features of PE pipes: it is the appropriate combination of four basic variables: molecular weight, molecular weight distribution, additives and density. Different catalysts can produce polymers with different characteristics, can produce PE pipe material with different uses, can achieve the effect of the balance on the performance. 　　Different PE pipes have different purposes: 　　PE gas piping: the connection of gas pipe is more reliable. Due to the method of electric hot melted connection, the strength of the joint is higher than that of the pipeline itself. Therefore, it has impact resistance under the condition of low temperature. In winter, gas piping won’t be broken, for the impact resistan...

　　In general, hot rolling has better mechanical properties than cold rolling. The hot rolled steel has improved tensile strength, yield strength, ductility and toughness. In addition, it is important that heat treatment eliminates residual stresses. While cold rolling refers to the processing of steel sheets or strips into various types of steel by cold drawing, cold bending, cold drawing, etc. At normal temperature, which may result from uneven deformation of the steel and esidual stress during processing, this residual stress has a great influence on stability. Both hot rolling and cold rolling are processes of forming steel or steel sheets, which have a great influence on the microstructure and properties of steel. The rolling of steel is mainly hot rolling, and the cold rolling is only used for producing small steel and thin steel. 　　Cold rolling 　　Advantages: 　　The molding speed is fast, the output is high, and the coating is not damaged, and various cross-section forms can ...

　　 Stainless steel seamless pipes treatment technology refers to the processing of achieving uniform silver, and has a metallic luster. This is generally referred to the production of large stainless steel seamless pipes. Because large stainless steel seamless pipe is manufactured through stamping, folding and welding process, the surface of workpiece has oil, rust, macular, which is neither beautiful, and easy to rust, reducing its stainless steel quality and value. 　　To make stainless steel seamless pipes achieve the standard, the surface must be finished. After forming matte treatment, that can achieve beautiful appearance, but also improve its anti-corrosion and anti-discoloration performance. After the above method, the corrosion resistance of stainless steel seamless pipes can be increased by 2 to 3 times. 　　Stainless steel seamless pipes does not rust due to the existence of chromium, nickel components, and then through the matt treatment, not only can eliminate the matrix ...

　　We know that steel pipe surface treatment is one of the key factors determine the service life of the pipeline corrosion, it is a precondition for whether the anti-corrosion layer and steel tube can be combined. It is verified by the research institutions that the life of the coating depends on the quality of coating types, coating quality and environmental factors such as construction. The steel tube surface treatment effects on coating life accounted for about 50%, therefore, we should be strictly accordance with the specification on the coating on the surface of steel pipe requirements, continuously explore and summary, continuously improve steel pipe surface treatment. 　　1. Cleaning 　　Using solvent and emulsion to clean the steel surface, to remove oil, grease, dirt, lubricants, and similar organic matters, but it cannot remove rust, scale, such as welding flux on the surface of the steel, so only as auxiliary in the anti-corrosion production. 　　2. Rust cleaning by tools ...

　　Test methods for spiral submerged arc welding pipe 　　Metallographic Metallographic method (or etching method) is polished bead cross-section, showing the inside and outside weld bead after welding performed partial measurement method. Showing that the method can be intuitively apparent bead offset, which can easily be welded deviating measurements. Metallographic welding deviating measurements each pipe manufacturers actually used, and can be summarized in three centerline method, arc deviation method and ridge line method. 　　Centerline on the sampling method can block containing bead, polished bead profile, weld deviating measured under an optical microscope; you can also use 5% (by volume) in the steel pipe end flat after nital wipe containing welding Road site, clearly show the weld bead after partial measurement. Inside, from the outside bead toe is the welding wire centerline partial amount. 　　The method generally arc deviation method after welding shop inspection post or ...