LSAW Steel Pipe

　　There are several methods of quenching the OCTG pipes , dipping, axial injection, laminar jet and laminar jet combined with axial injection. It will form the centrifugal force when quenching OCTG pipes and the centrifugal force will cause the deformation on pipes, which has serious influence on the quality and application of pipes. Therefore, it’s significant to have distortion control during quenching OCTG pipes. 　　1. Apply the quenching step by step. 　　Since the quenching water is flowing from one end to other end, therefore, the cooling rate is different in the two ends of pipes, which will make the pipes to be bent. Manufacturers can water the outer surface and then the inner, so that can prevent pipes from bending. Prolong the tine about 2 to 10 seconds for inner cooling. 　　2. Reduce the hanging length of pipes in the rotating wheel. 　　Through reasonable length control, make the hanging length with 600mm, which can reduce centrifugal force during quenching and decrease t...

　　JIS G3445 STKM11A is a standard material for carbon seamless steel pipes for mechanical parts in Japan. 　　High-quality carbon structural steel is carbon steel with carbon content less than 0.8%. The steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has excellent mechanical properties. 　　JIS G3445 STKM11A steel contains a certain amount of silicon (Si) (generally not more than 0.40%) and manganese (Mn) (generally not more than 0.80%, up to 1.20%) in addition to carbon (C) element and deoxidation. Except for alloying elements, it does not contain other alloying elements (except for residual elements). This type of steel must ensure both chemical composition and mechanical properties. The content of sulfur (S) and phosphorus (P) impurity elements is generally controlled to be less than 0.035%. If the control is below 0.030%, it is called high-quality steel, and the grade should be followed by “A”, for example, 20A; if P is controlle...

　　API standards are designed to qualify the oil and petrol industry according to the legislation and environment requirements. According to API, oil and natural gas industry can have the reference standards about its industry. Under the general standards, there are some subordinated specifications drafted for each specific OCTG product, such as API 5B, API 5CT, API 5D, API 5L and so on. 　　API 5L covers seamless and welded steel line pipe . It provide specification for pipe used in conveying gas, water, and oil in both the oil and natural gas industries. It includes standard-weight and extra-strong threaded line pipe; and standard-weight plain-end, regular-weight plain-end, special plain-end, extra-strong plain-end, special plain-end, extra-strong plain-end pipe; as as well as bell and spigot and through-the-flow line(TFL) pipe. 　　Grades covered by API 5L are A25, A, B (and the following "X" Grades), X42, X46, X52, X56, X60, X65, X70, X80. The two digit number following th...

　　Generally, the hardness of seamless steel pipes has three standards: Brinell Hardness, Rockwell Hardness and Vickers Hardness. 　　 1. Brinell Hardness 　　Brinell Hardness is the most common standard for seamless steel pipes, generally use diameter of indentation to represent the hardness of material, which is intuitive and simple. However, the standard is not suitable for hard and thin steel pipes. 　 　2.Rockwell Hardness 　　Rockwell Hardness is also use indentation to represent the hardness, but Rockwell measures its depth rather than diameter. Rockwell Hardness is widely applied in testing hardness of seamless steel pipes, the standard HRC is the most popular testing method next to Brinell Hardness (HB). Rockwell Hardness can be used to test both extremely soft and hard material which supplements shortcomings of Brinell Hardness. The number of hardness can be read directly from the dial. However, due to slighter indentation, Rockwell Hardness is less accurate than Brinell Hard...

　　The pressure welded steel pipe consists of pipe, pipe fittings which include elbow, tee joint, taper pipe and other fittings, valve, flanged joint (flange, spacer as well as bolts), and these composition pieces are generally standard components, which can be fully decided by several factors such as their nominal pressure, texture of material, nominal diameter as well as wall thickness of the Welded steel pipe. And the nominal pressure of all the piping components in the same pipeline pressure grade. Thus, the nominal pressure grade of the piping components are called pipeline pressure grade in engineering. 　　The pipeline material grade is the piping components selecting and using regulations established by the designing institute or the engineering companies. And it is always given in the form of the excel sheet. In addition, the engineering and technical staff can make sure the detail specific provision of all kinds of dimensions and specifications of the piping components on the...

　　X80 pipeline steel is made of high strength and toughness by deformation strengthening, and X80 steel is also ultra-fine grain, high purity steel. Therefore, the steel puts special requirements on the welding process, mainly in how to prevent grain coarsening, local softening and embrittlement in the heat affected zone, how to achieve the purity of the weld metal and grain refinement, how to choose Welding methods and improved welding processes. Grain coarsening in the heat affected zone is an unavoidable phenomenon, and the grain growth weakens the performance of the welded joint. 　　In order to control the grain growth of the heat affected zone of the pipeline steel at high heat input, the small welding heat input or high energy beam welding method is often used to narrow the coarse crystal zone so as not to affect the serviceability of the welded joint. However, cold cracks are likely to occur at the weld seam under small line energy. Therefore, it is necessary to preheat the wel...

　　Due to the different production process and materials, we know that there is huge difference between galvanized and seamless steel pipe. Today, we will compare these two kinds of steel pipes for their uses difference. 　　For seamless steel pipe, it is used among lots of industries widely. Except the general usage of water, gas, oil, general low pressure fluid line pipe, it can be used among heating oil oil industry in particular, marine oil field oil well pipes, pipelines, chemical coking equipment and so on. 　　For galvanized steel pipe, it has more limit than seamless one. Generally speaking, we would like to make it in the project of fence, balcony guardrail, roads, factories, development zones and so on. 　　When talked about high pressure or high dense medium transportation, we would like to choose seamless steel pipe for the basic guarantee during the whole transmit process. 　　 http://www.xysteelpipe.com/info/Uses-difference-for-SMLS-and-galvanized-steel-pipe-1250-1.htm

　　We’ve noted about the question why there are so many types for steel pipe fittings. Today, we would have a list for the types of steel pipe fittings standard. Under this situation, you would know how to choose the rightful one for your joint of your seamless or welded steel pipe like ERW steel pipe. 　　There are ANSI, ASME, ASTM, AN, BSP, DIN, ISO, JIS and NPT types of pipe fittings. Today, we can list for the ASME for customers and more information can be got for connection with our service. 　　ASME: American Society for Mechanical Engineers 　　This is one of the reputed organizations in the world developing codes and standards. The schedule number for pipe fitting starts from ASME/ANSI B16. The various classifications of ASME/ANSI B16 standards for different pipe fittings are as follows: 　　ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flange Fittings 　　ASME/ANSI B16.3 - 1998 - Malleable Iron Threaded Fittings 　　ASME/ANSI B16.4 - 1998 - Cast Iron Threaded Fittings 　...

　　From manufacturing processes we can know that SAW (LSAW, SSAW) and ERW pipes are entirely different right from formation, welding etc. and hence, the performance of both the pipes differ in the following aspects: 　　1. The surface quality of ERW pipes are better when compared to SAW (LSAW, SSAW) pipes, as they are smooth and have a better finish. In most of the SAW pipes, it is mainly about the weld reinforcement internally and externally. 　　2. The defects found in ERW pipes are lesser than SAW pipes. As there is a solvent deposit in SAW pipes, it results in more defects apart from the defects in the volume. The defects found in ERW pipes are only confined to wire-line and straight welds and it can be inspected easily. The defects can be noticed easily and the ultrasonic reflection on the surface makes it easier to detect. 　　3. The residual stress ratio in ERW is lower than SAW pipes. As ERW pipe deformation happens more in ERW followed by a sizing of flat oval, it results in ...

　　ERW welded pipe manufacturing process 　　ERW process normally applied to the pipe below 24 in, 609 mm. 　　ERW/HFW Longitudinally Welding Steel Line Pipe (Electric Resistance Welding ) Manufacturing Flow Chart 　　Uncoiling – Flattening – Shearing and Butt Welding – Loop Storing – Plate UT – Trimming – Forming – High Frequency Welding – Removal of Inside and Outside Blurs – Ultrasonic Testing – Annealed by Medium Frequency – Air Cooling – Water Cooling – Sizing – Straightness – Cutting Off – Dimension and Initial Surface Inspection – Pipe Ends Beveling – Hydrostatic Test – Ultrasonic Testing of Entire Tube – Off Line Ultrasonic Testing – Ultrasonic Testing for Pipe Ends – Dimension and Final Surface Inspection – Corrosion Resistant Coating – Marking – Pipe Ends Protection – Inspection and Warehousing 　　 LSAW pipe manufacturing process 　　LSAW pipe applied to diameters from 20 in (508 mm) to 40 in (1016 mm). 　　LSAW Welded Steel Line Pipe Manufacturing Flow Chart: 　　Plate UT –...

　　The production characteristics of high-pressure boiler pipe 　　1. Tube. High surface quality requirements, the need for stripping, an amount of 5 mm strips, some plants take black grinding. 　　2. Tube cutting. Hard steel, the use of flame cutting or sawing. 　　3. Heating. Poor thermal conductivity, and therefore to control the furnace end temperature. The heating temperature is generally 1120 ~ 1180 ℃. 　　4. Rolling. Such steel is generally better performance perforation, deformation parameters can be selected carbon steel. 　　5. Rolling after heat treatment. Such pipe after rolling to normalizing and tempering. Air cooling after hot rolling and then take some factories in 730 ~ 740 ℃ tempering. 　　Higher steel tube geometry requirements in order to ensure a good counterpart welding, pipe length should be as long as possible, helps to reduce the number of welds. 　　 　　 Check www.tjxysteel.com for more info