Seamless Steel Pipe

　　This year, the effectiveness of China's steel industry achieved a comprehensive upgrade, what is the main reason? Prime Steel Pipe as the leading manufacturer and exporter of carbon steel pipe , including ERW steel pipe, LSAW steel pipe, SSAW steel pipe, seamless steel pipe, etc., we think the main reason are: 　 　1. Domestic economy remain stable 　　First of all, the national economy remain stable, real estate, infrastructure, automotive and other related industries demand, become the biggest driving force of the steel industry. GDP growth 6.9% in the first half of 2017, for eight consecutive quarters to maintain the range of 6.7% -6.9%, of which real estate and infrastructure investment growth has rebounded. 　　 2. Effective supply structural reform 　　Second, the supply structural reform and DE-capacity promotion effective changed the phenomenon of excess capacity. According to the data report, five years target of excess capacity of China's iron and steel industry is ...

　　The joint coefficient of the welded steel pipe is divided into two zones, one is the weld zone and the other is the fusion zone. 　　 1.Weld area 　　After the joint metal and the metal to be filled are melted, it is cooled at the fastest speed. The weld arrangement is an as-cast arrangement of liquid metal crystallization, and the composition is segregated, the crystal grains are coarse, and the arrangement is not fine. However, due to the small weld pool, rapid cooling, strict chemical composition control, carbon, sulfur, and phosphorus are low, and the weld chemical composition is adjusted by the alloy to make it rich in certain alloying elements. Therefore, the weld metal The functional problem is not big enough to be able to satisfy the function pleading, especially the strength is simple to arrive. 　 　2. Melting zone 　　A transition between the melt zone and the non-melting zone. The chemical composition of the fusion zone is not uniform, and the arrangement is coarse, often...

　　 Seamless steel tube has a hollow section, a large number of which are used for conveying fluid, such as crude oil, natural gas, coal gas, water and some solid materials, etc. Compared with solid round steel, when the torsional strength is same, the weight of the seamless steel pipe is relatively light, so it is a kind of economical steel, which is widely used in manufacture oil tubular goods and mechanical parts. 　　Difference 　　The cold rolled seamless tube allows local buckling, which can make full use of bending bearing capacity. While, hot rolled steel does not allow local buckling. 　　The causes of residual stress are different, so the distribution of the cross section is also very different. The distribution of the residual stress on cold rolling thin wall steel is bending. However, the distribution of the residual stress on hot rolled steel is film type. 　　The free torsional rigidity of hot rolled steel is higher than that of cold rolled steel. In other words, the tors...

　　Galvanized square tube used in construction where it is very broad, here are some advantage of galvanized square tube: 　　First, galvanized square steel pipe is obtained through galvanized materials, so itsperformance is very good, it has very good corrosion resistance, it can make use of this advantage is easily corrupted in the environment, it also can play a very good waterproof performance, so we can guarantee rusting at the time of contact with the water quality will not be caused by moisture, the life of the guaranteed. 　　Secondly, the density of hot galvanized square tube like schedule 40 square and rectangular steel pipe is very good, or whether it should be better than other steel materials from the material itself, from its structure, it can not be used when outside material damage; has a very strong anti-grindability, when in use, can easily be placed and transport. 　　Finally, the stretch of hot galvanized square tube like 2.5 inch galvanized square steel pipe also v...

　　 Steel pipe is used in many areas of modern manufacturing and construction. Often, it’s used in high stress environments and structural component. With that level of importance, a smart builder ensures that any piping he uses is good quality. Even if you don’t personally run tests on your steel, it’s a good idea to know what kinds of tests might be done on it and have a general idea of how they work. 　　Hydrostatic Testing 　　One of the most common methods for testing pipe is hydrostatic testing. This test is used to find leaks and to pressure-test vessels that will be used to contain liquids and gasses. It works by filling the pipe with a liquid and then pressurizing it to a specific level. 　　Ultrasonic Testing 　　Ultrasonic tests can be run to determine the wall thickness of a pipe, which is important in determining what pressure it can contain and how much it can support as a structural component. 　　Ultrasonic testing, also known as “UT”, is performed by transmitting a hig...

　　Precision pipe is the carbon, alloy or stainless steel pipe with high precision sizes. Usually it has been made through hot rolling or cold drawn (cold rolling) processes. So precision pipe is a kind of seamless pipe. 　　Key processes in manufacturing the precision steel pipe 　　During manufacturing processes, the key point is to do the annealing for raw materials. 　　Precision steel pipe manufacturing flow chart: 　　Raw Material Inspection – Remove Oxide Layer – Visual Inspection – Heating – Hot Rolling – Pickling and Passivation (Phosphating) – Grinding – Lubrication and Drying – Cold Rolling (Internal and external extraction) – Remove Oil – Ends Cutting – Inspection – Marking – Packing and Storage 　　As we know, most of precision steel pipe has cold drawn and hot rolled process. On the contrast, cold rolling will be more complicated. Not only the pipe need to be continuous rolled by three roller, but also the test have to be done after extrusion, so to guarantee the quality ...

　　LSAW (Longitudinal double submerge arc welding) carbon steel pipe is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding. 　　The LSAW large diameter steel pipe manufacturing process is explained in the steps below: 　　1. Plate Probe: This is used for manufacturing the large diameter LSAW joints right after it enters the production line which is the initial full-board ultrasonic testing. 　　2. Milling: The machine used for milling does this operation through two-edged milling plate to meet the requirements of the plate width and the sides parallel to the shape and degree. 　　3. Pre-curved side: This side is achieved by using a pre-bending machine on the pre-bending plate edge. The plate edge needs to meet curvature requirement. 　　4. Forming: After the pre-bending ...

　　 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...

　 　Corrosion Protection 　　Coating or cathodic protection is not required for stainless steel in most locations. A thin chromium-rich self-healing oxide film provides corrosion protection for stainless steel and no corrosion allowance is required. Erosion Resistance Stainless steels are much more resistant to erosion-corrosion caused by high flow rates and particulate matter than steel. They can handle high velocity and turbulence (pumps) without suffering wall thickness erosion. 　　Low Coefficient of Friction 　　Stainless steel retains low hydraulic friction properties as compared to aging cement lined or corroded steel pipes, which results in lower water pressure losses and pumping cost savings. 　 　Ease of Fabrication 　　Stainless steels have excellent ductility and can be formed and welded into lightweight shapes, which assists in the handling and installation of pipelines. Stainless steel pipe is highly interchangeable and easily connected with other water piping systems and...

　　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...

　　Galvanized pipe is protected by zinc, so it is not easy to rust, galvanized steel pipe is lighter than seamless steel pipe , if it is used in the balcony, the best light with galvanized pipe, because seamless steel pipe is heavy with thick wall thickness, and the cost of seamless steel pipe is higher than galvanized steel pipe, as well as galvanized steel is durable, useful life is much more than a seamless pipe. Surface coated or hot dip galvanized welded steel pipe can enhance corrosion resistance and prolong life. 　　Difference between galvanized pipe and seamless pipe 　　Manufacturing process difference: 　　Galvanized steel refer to a galvanized surface, there may be welded pipe, it could be seamless, seamless steel pipe manufacturing process means welded and seamless points. 　　Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. seamless pipes dominates 65% of market share in Chinese boiler industry. 　　Use...

　　Large-diameter seamless steel pipe thermal molding manufacturing process is mainly used for the following components: 　　automotive hoses: steering tube, brake pipe, air conditioning pipes, fuel pipes, cooling pipes, cooling hoses, heater hoses, air filter hoses, turbo system hose, engineering hydraulic hose; air hose and manifold; hard pipe or fittings and other automobile brake pump, radiator, oil cooler, cylinder; engineering hydraulic hose is mainly used for hydraulic equipment, engineering machinery, mining machinery, such as hydraulic pipe burst test; pressure equipment body, such as the need to detect the cylinder pressure, the burst test. 　　 Device Features: 　　1. With a gas-driven automatic booster pump, the output pressure can be easily adjustable, controllable; 　　2. Advanced technology, reasonable structure design. With small size, light weight, elegant appearance characteristics; 　　3. All bearing parts are international famous brands of standard parts, without an...

　　Steel pipes are ubiquitous and can be found underground and within residential walls, laboratories, and commercial and industrial structures. The pipes transport fluids including water, natural gas, waste and air. Three manufacturing methods exist to produce steel pipes. Seamless steel pipes are produced using an extrusion mold. Welded steel pipes are produced by rolling a sheet of steel into a tube and welding the seam. 　　The seamless steel pipe manufacturing process starts with a solid, round steel billet. This billet is then heated to great temperatures and stretched and pulled over a form until it takes the shape of a hollow tube. As other steel pipe suppliers will tell you, there are three great advantages to making a pipe in this way. 　　Increased Pressure Ratings 　　The greatest advantage of seamless steel pipes is their increased ability to withstand pressure. The weakest point in a welded steel pipe is the welded seam. But because a seamless steel pipe has not been weld...

　　 A179 seamless steel pipe is widely used in industries such as petroleum, chemical, medical, food, light industry, machinery, instrument, include industrial pipeline and mechanical structure parts, etc. 　　This is an effective way of metal corrosion, the use of the main features are the following: 　　1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable. 　　2. With iron - zinc alloy layer, combined with dense, and with the unique anti-corrosion in the mari...

　　 Seamless steel pipe quality testing is a very important step, and for its detection method is also very particular to now all three - ultrasonic testing, eddy current testing, magnetic flux leakage testing, here we will introduce you specific circumstances non-destructive testing. 　　Nondestructive Testing, shorted for NDT, is a widely-used method in pipeline inspection. It is a process of testing, inspecting and evaluating the quality and characteristics of the material without damaging the pipeline itself or affecting the later regular work of the pipe. In other words, after NDT testing, the part can still be put into practical use. NDT utilizes the changes in heat, sound and magnets caused by abnormal inner structure or flaws to inspect the internal and external defects of the material. 　　The common inspection methods of NDT are visual testing (VT), ultrasonic testing (UT), radiographic testing (RT), hydrostatic testing. Anson International co, ltd uses ultrasonic testing (UT...

　　Anticorrosion pipe lifting loading and unloading require specialized personnel command, both ends of the tube must be set to shake the rope to ensure the correctness of the unload position preservative tube. Corrosion pipe lifting or unloading pipe, you need to be handled with care to avoid a collision with each other preservative tube or pipe and other objects. Cause corrosion damage to the tube. After unloading the hook, rope speed to control the football, to prevent damage to the coating hook. 　　Transport pipe corrosion: corrosion pipe transport needs dedicated hosting car on consignment, the length of the tube is not more than two meters range, anti-corrosion pipe handling vehicle height and number of layers must be in accordance with the requirements of construction norms. Steel transport vehicle requirements, each vehicle must be shipped with a sub-standard pipe, when the tubes shipped to the designated place, unloading pipe require specialized transportation management perso...

　　Tips for choosing good quality seamless steel pipes . 　　1. As for good quality seamless steel pipes, its cross section should be smooth and even. If you see there is burr or uneven cross section, do not pick up these defective seamless steel pipes. 　　2. You need to know the percent of impurities. Weight the pipes and measure its density. If it is low density, light seamless steel pipes will be poor quality. 　　3. Check trademark. There will be standard trademark and words on seamless steel pipe from good quality seamless steel pipes manufacturers. 　　4. Check the shape of seamless steel pipes. As for poor quality pipes, you will find oval shape on the side of it. 　　5. Check the surface of seamless steel pipes. Bad rolling technology produce rough surface seamless steel pipes. Do not choose poor surface seamless steel pipes.

 　　Pipeline pickling refers to a series of technical treatment processes on the inner surface of a pipe according to a specific process procedure using an acid or alkali solution with a small amount of corrosion inhibitor or active agent added, which will removes oxides and grease from the surface of the pipe by chemical action to obtain a shiny metal surface, ensuring that the inner wall of the pipe has a specified cleanliness. 　 　Pickling method 　　The method of pickling the pipeline can be divided into a trough pickling method and a circulation pickling method, and the cyclic pickling can be further divided into on-line circulating pickling and off-line circulating pickling. 　　The trough pickling method removes the pipe or the installed pipe, and is immersed in the chemical pickling tank in sections. After passing the technical treatment, it is transported to the construction site to restore the original installation state. In-line circulation pickling method is to connect ...

　　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...

　　Q235 is not only the material used for the production of galvanized steel pipe rack, but also the only standard to verify the quality of pipe rack, as well as test tube rack quality. Q235 includes carbon C: ≤0.20% Si Si: ≤0.35%, manganese Mn: 0.3 ~ 0.7%, sulfur S: ≤0.045%, phosphorus P: ≤0.045%, chromium Cr: to allow the residual content of ≤0.30%, Ni: to allow the residual content of ≤0.30%, copper Cu: to allow the residual content of ≤0.30%, Q235B a certain elongation, strength , good toughness, easy stamping and welding, widely used in the manufacture of mechanical parts in general. Mainly used in construction, the bridge engineering and high quality welded structure. 　 　Q235 Material galvanized pipe 　　Therefore, the use of materials Q235 galvanized steel pipe, rack tube material is divided according to: 　　1. A single standard steel pipe rack: it is a steel pipe with the same specifications (example: scaffolding fasteners such as:. Ф48 × 3.5 of welded steel pipe) 　　2. A va...