LSAW Steel Pipe

　　Heavy-weight drill pipe is made from AISI 4145H steel, after all the heat treatment of materials, all physical properties comply with recent provisions of API specification 7. Integral heavy weight drill pipe is a common transition between the drill pipe and drill collars of the drill, which can effectively alleviate the drill collars and transition in the combined stress concentration provides drilling, and can effectively reduce the drill and the wear rate of the connection area and diameter of the borehole. Drill pipe in central part of the thickened, welding joints and thickened in the middle part of the appearance of cemented carbide wear, can effectively protect the pipe from wear and tear. In a soft case of geological formations, heavy weight drill pipe can replace the drill collar to solve a series of problems occurred in vertical drilling. Here are some characteristics and advantages of heavy-weight drill pipe: 　　1. Extra length of tool joints provides plenty of space to o...

　　ERW pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. 　　1. Yield strength of the N80 is higher than the J55 up to 173 ~ 206 MPa. 　　2. On the same area of ??the sample, the elongation of N80 is higher than J55. 　　3. Under the same size, the same sample orientation, the same minimum sample size, J55 grade couplings, coupling stock, coupling material, semi-finished and coupling attachment material can absorb lower than N80 steel grade. 　　4. The nondestructive testing methods of seamless pipe,coupling stock, welded tube with J55 and N80 is differeent. 　　5. J55 and N80 steel grade is not the same color: length greater than or equal 1.8m, J55 painted a bright green, N80 painted a red; 　　6. J55 chosen by the manufacturer, or organize according to the order specifi...

　　The hardness of carbon steel pipe commonly used Brinell, Rockwell, Vickers hardness of three kinds of indicators to measure. 　　Brinell hardness 　　In the steel standard, it is the most widely Brinell hardness, often expressed in the indentation hardness of the material in diameter, both intuitive and convenient. However, for a hard steel or steel thin NA. 　 　Rockwell hardness 　　Rockwell hardness test tube with Brinell hardness test, as are the indentation test methods. The difference is that it is a measure of the indentation depth. Steel Rockwell hardness test is a very wide application, wherein after the Brinell hardness HB HRC use in steel standard. Rockwell applicable to the determination by the extremely soft to extremely hard metal materials, which make up not Brinell method, compared with Brinell method is simple and can be read directly from the dial hardness machine hardness value. However, because of its small indentation, the Brinell hardness values better method i...

　　 Stainless steel pipes are used in a wide range of industries/markets, due to their overall corrosion resistance and good machinability. Pipes are generally considered passageways for liquids, and measured by inside diameter or ID. Some industry examples include marine, chemical & petrochemical, oil & gas, and renewable energy. Here are some test methods for identifying stainless steel pipe: 　　First, the magnetic test 　　The magnetic test is the simplest way to distinguish between annealed austenitic stainless steel and ferritic stainless steel. Austenitic stainless steel is non-magnetic steel, but by the cold down after cold processing will have a mild magnetic; and pure chrome steel and low alloy steel are strong magnetic steel. 　　Second, nitric acid point test 　　One of the salient features of stainless steel welded pipes is the inherent corrosion resistance of concentrated nitric acid and dilute nitric acid. This performance makes it easy to distinguish from most o...

　　According to the different process requirements, steel pipe length measurement system has following methods. 　 　1, The grating length measurement 　　The basic principle is: the outer ends are provided two fixed length steel grating, utilizing rodless cylinder near both ends of the steel grating drive, using light interference realize the measurement of the length of the pipe. It is characterized by high accuracy. But the scale is expensive and difficult to maintain, the impact of dust and vibration are sensitive site. 　　 2, The camera length measurement. 　　Camera length measurement is the use of image processing to achieve pipe length measurement, the principle is equidistant installed in a section of pipe on the roller conveyor series of photoelectric switches, plus light source and the camera in the other section. When the pipe through the region, can be determined by the camera intake pipe length image on the screen at the position according to a photoelectric switch. Fea...

　　42CrMo seamless steel pipe is a super high strength steel with high strength, toughness and good hardenability. 　　42CrMo Seamless Steel pipe Uses: Bridges, Automobiles, Pressure Vessels. This kind of steel relies on adjusting the carbon content to improve its mechanical properties. Therefore, according to the carbon content, this kind of steel can be divided into: low carbon steel - carbon content is generally less than 0.25%, such as 10, 20 steel, medium carbon steel - carbon content is generally between 0.25% and 0.60%, such as 35, 45 steel, etc., and high carbon steel - carbon content is generally more than 0.60%. This kind of steel is generally not used to manufacture steel pipes. 　　No obvious tempering brittleness, small deformation during quenching, high fatigue limit and multiple impact resistance after quenching and tempering, good impact toughness at low temperature, high creep strength and endurance strength at high temperature. 　　Process specification 　　Heating 　...

　　 Galvanized pipe coating process 　　A continuous galvanized pipe coating production technology and equipment, and the process includes the following steps: passivation, cleaning; paint; curing, with drying preheating before coating, and the drying preheating temperature is about ±20 ℃ of the curing temperature. The device is based on the known device, before the dip-coating slot with drying preheating furnace. The process and equipment can not only in bulk for continuous galvanized pipe paint production, but also ensure the quality of paint, the surface no bubbles, no orange peel, efficiency can be improved twenty or thirty times. 　　Hot dip galvanizing production difficulty is steel leakage defect, zinc layer falls off and edge thick. 　 　1. Steel leakage defect 　　In order to reduce cost and increase the strength of steel, much more silicon are often be added to the steel base. The exceeded silicon can increase the surface tension, reduce the steel plate to the zinc liquid wet...

　　In some high-intensity work environment, large-diameter seamless steel pipe may deform. So how to straighten large diameter seamless steel pipes? The best way is to use steel pipe straightening machine. Steel pipe straightening machine is used for metal profiles, bars, tubes, wire, etc. Here we will introduce operations and attentions of steel pipe straightening machine to correct large diameter seamless steel pipes. 　　1. Before starting, check the hydraulic oil box, gear box is full or not. 　　2. Before starting the main motor, adjust the hydraulic system pressure. 　　3. Lubricate every smooth point and ensure the work of the mechanical transmission is sensitive. 　　4. After the oil pressure reaches stable. The straightening rollers should be lifted to the initial position. 　　5. Put the large diameter seamless steel pipe on the third straightening roller. 　　6. Start the main motor, large diameter seamless steel pipe will rotate with straightening. 　　7. Stop the motor and...

　　High-precision cold drawn seamless carbon steel pipe abroad is generally increased in the metal alloy approach to improve material performance in the cold drawn seamless steel pipe, after all need to stress annealing, to eliminate residual stress of materials, to improve the organization of materials,improve the plastic material, thus preventing the purpose of seamless steel pipe fracture failure occurs. 　　At present, the common cold drawn seamless steel tube material are 45 # or 20 # steel 27SiMn steel, deformed by cold drawing of metal strength increases; However, it is at the expense of metal plasticity, toughness is the price.High-precision cold drawn seamless steel pipe is its high dimensional accuracy and high strength properties and market-based, it must ensure that the deformation within a certain range, in order to maximize the performance of materials to reduce materialadversely affected.Cold drawn seamless steel tube deformation is too small to achieve the surface finis...

　　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.

　　The main factors affect the quality of seamless steel pipe machining are machine tools, knives, fixtures, workpiece blanks, process methods and processing environment. To improve the quality of seamless steel pipe cutting, we must take appropriate measures in these areas, such as reducing machine work error, the correct selection of cutting tools to improve the quality of blanks, reasonable arrangements for the process to improve environmental conditions. 　　Reduce the seamless machine tool cutting error usually used methods are: 　　1. Use with sufficient precision and stiffness of the machine. 　　2. If necessary, you can take the compensation correction method, such as in the thread grinder or hobbing machine, according to the previously measured machine tool chain error error correction device to correct the machine drive system error. 　　3. Use of machine tool fixture to ensure the accuracy of processing, such as the use of boring die processing box on the hole system, so tha...

　　According to the different process requirements, steel pipe length measurement system has following methods. 　 　1, The grating length measurement 　　The basic principle is: the outer ends are provided two fixed length steel grating, utilizing rodless cylinder near both ends of the steel grating drive, using light interference realize the measurement of the length of the pipe. It is characterized by high accuracy. But the scale is expensive and difficult to maintain, the impact of dust and vibration are sensitive site. 　　2, The camera length measurement. 　　Camera length measurement is the use of image processing to achieve pipe length measurement, the principle is equidistant installed in a section of pipe on the roller conveyor series of photoelectric switches, plus light source and the camera in the other section. When the pipe through the region, can be determined by the camera intake pipe length image on the screen at the position according to a photoelectric switch. Featu...

　　Outer surface defects of hot-rolled seamless steel pipe . 　　1. An outer fold: the outer surface of the pipe presents a layered folded spiral. 　　2. separation: presenting a spiral shape or blocky delamination and cracking. 　　3. external scarring: scars on the outer surface. 　　4. pock surface: steel surface showed uneven pits. 　　5. Line: a substantially symmetrical or asymmetrical linear rolling marks. 　　6. Hairline: a continuous or discontinuous hairy fine lines. 　　7. net cracks: scaly small cracks. 　　8. scratches: linear or spiral-shaped groove-like defects. 　　9. touch deflated: the outer surface of the steel pipe rendered in a convex outer concave phenomenon, and pipe wall thickness without injury. 　　10. bumps: collision irregular scars. 　　11. straightening recess: steel spiral concave outer surface. 　　12. rolled off: longitudinally local or long presentation in a convex outer concave folds, the outer surface into strips depression. 　　13. crack:opened the r...

　　Overview of two steel pipe processes 　　Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydraulic test (inspection) → mark → storage. 　　Hot rolling (extrusion seamless steel pipe): round tube billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → blank tube → straightening → water pressure Test (or flaw detection) → mark → into storage. 　　Detailed explanation of two steel pipe processes 　　The cold drawn steel pipe is made of hot-rolled steel coil as raw material, it's subjected to pickling to remove scale and then cold-rolled. The finished product is rolled hard roll. The cold work hardening caused by continuous cold deformation to make the strength and hardness of the rolled hard roll rise and tough. T...

　　Hot-dip galvanized steel pipes are used in construction, machinery, coal, chemical, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, mining machinery and other manufacturing industries. 　　The surface of the galvanized steel pipe is welded with hot dip or galvanized steel. Zinc plating can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipes are widely used, in addition to pipelines for general low-pressure fluids such as water, gas, oil, etc., it also used as oil well pipes and oil pipes in the petroleum industry, especially in offshore oil fields, oil heaters, condensation of chemical coking equipment, cooler, coal distillate oil exchanger pipe, trestle pipe pile, and support pipe for mine tunnel, etc. 　　The hot-dip galvanized tube is obtained by reacting a molten metal with an iron matrix to produce an alloy layer, thereby combining t...

　　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. Here we will introduce the strength under loads of seamless steel pipe. 　　Seamless steel pipe can sometimes be more expensive than other forms of steel pipe, but it’s also more reliable. 　　This is because it has greater strength under loading. Empty pipe must always support its own weight, but when a pipe is filled with material–or under load–it ...

　　 Classification of welded steel pipe 　　1, High frequency welded steel pipe features: tubular good, uniform thickness, internal and external burrs produced by the welding tool calibrating the appropriate online through strict control of non-destructive testing of weld quality, high degree of automation, low production costs. But relatively thin wall thickness, diameter is relatively small, usually no more than a wall thickness of 12mm, diameter generally does not exceed 610mm, particularly suitable for the production of steel tube truss structure. 　　2, LSAW pipe features: welding under static conditions, high weld quality, short welds, the probability is very small defects. By expanding full-length steel tubular good, precise size, wide range of pipe wall thickness and diameter range, the diameter range up 406-1829mm, wall thickness range up 6.0-60mm, high degree of automation, Compared to seamless steel, it is lower production costs, for buildings, bridges, dams, offshore platfor...

　　Finishing tube is also called cold rolled precision tube, it is one of the types of seamless steel tube production process. The characteristics of the fine rolling tube: 　　1. The cold rolled precision tube tolerance dimension precision is high, the product accuracy control in the plus or minus 5 mm, inside and outside wall finish good, surface oxide layer. 　　2. The comprehensive performance of cold rolled precision tube is good, can bear high pressure, cold bending, flaring, flattening not crack, not wrinkled skin, can do all kinds of complex deformation and mechanical processing. 　　3. The popularization and application of precision seamless steel pipe steel can save and improve processing efficiency and reduce machining process and equipment investment, can save cost and save machining time, greatly improve the production capacity and material utilization, at the same time to improve product quality, reduce the cost. 　 　Finishing pipe application: 　　Cold rolled precision ...

　　Steel tube is used in a variety of structural and industrial applications, such as automobile transport, architecture, and construction. These steel tubes are fabricated from different variants of steel ranging from stainless, carbon, galvanized, or mild steel, depending upon the application requirements. Steel tubing is divided into two classes: mechanical and structural, depending on its design. So what is the difference between mechanical and structural steel tube ? Below are some points to consider while differentiating the two types of steel tubing. The comparison is made on the basis of application, specification, and shape. 　　Comparison between mechanical and structural steel tube 　　Application: Mechanical tubing is used in low stress and light gauge structural applications. These applications include conveyor belt components, solar panel supports, greenhouse structures, kitchens and restaurants, hospitals and medical equipment, and various types of industrial machinery. S...

　　Galvanized steel pipes: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electric steel zinc. The hot-dip galvanizing galvanized layer is thick and the cost of electro-galvanizing is low. 　　Blowing oxygen welded pipe: used as a steel pipe for oxygen blowing, generally with small diameter welded steel pipe, the specifications are from 8/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q195-Q235 steel strip. For corrosion protection, some are aluminized. 　　Wire bushing: It is also an ordinary carbon steel electric welded steel pipe used in concrete and various structural power distribution projects. The commonly used nominal diameter is from 13-76mm. The sleeve of the wire sleeve is thin, and most of it is coated or galvanized, and a cold bend test is required. 　　Metric welded pipe: The specification is in the form of seamless pipe. The welded steel pipe is exp...