Seamless Steel Pipe

　　In the cross-section of the lsaw steel pipe , there is a phenomenon that the outer diameter is not equal, that is, there is a maximum outer diameter and a minimum outer diameter which are not necessarily mutually perpendicular, and the difference between the maximum outer diameter and the minimum outer diameter is ellipticity (or not Roundness). In order to control the ellipticity, some lsaw steel pipe standards specify the allowable index of ellipticity, which is generally specified as not to exceed 80% of the outer diameter tolerance (executed after consultation by the supply and demand sides). 　　LSAW steel pipe is curved in the length direction, and its curve degree is called curvature. The bending degree specified in the standard is generally divided into the following two types: Partial bending: Using a one-meter-long straight ruler at the maximum bending of the steel pipe, measure the chord height (mm), which is the value of the local bending degree. Its unit is Mm/m indicate...

　　The production control of the thick-walled spiral steel pipe is to increase the plastic toughness of the steel pipe, improve the cleanliness of the molten steel, reduce the harmful inclusions, and improve the overall quality of the steel pipe. In the production process, a reasonable cooling system is adopted to avoid internal cracks and enhance the quality of steel pipes in many aspects. 　　 SSAW steel pipe in the production process of reasonable control of the heating temperature, through the determination of the thermoplastic curve, select the best heating temperature. The billet heating should also pay attention to enough heat preservation time to reduce the deformation resistance and increase the toughness of the thick-walled spiral pipe plastic. 　　SSAW steel pipe production process requires more procedures, the final step is to reduce the roller speed, the roller speed is the key parameter of the perforation process, the roller rotation speed from low to high changes in the ...

　　For ssaw steel pipe , we all know that the quality of the ssaw steel pipe is the most important thing for the quality of the whole spiral steel pipe, but the inspection of the geometric size of the spiral steel pipe can not be underestimated. So what tools do we use to measure the geometrical dimensions of spiral steel pipes? Here we give you a brief introduction: 　　1. Inspection of outer diameter and ellipticity of spiral steel pipe: caliper, vernier caliper and ring gauge, measuring the maximum and minimum points. 　　2. Check the thickness of the spiral steel pipe: Micrometer, ultrasonic thickness gauge, no less than eight points at both ends and record. 　　3. Spiral steel pipe end face angle and blunt edge inspection: square, card board. 　　4. Check the length of spiral steel: steel tape, artificial, automatic length measurement. 　　5. Spiral steel tube bending inspection: ruler, horizontal ruler (1m), feeler ruler, thin line measured per meter bending, full-length bending. ...

　　 SSAW steel pipe feeds the steel strip into the welded pipe unit and is rolled by multiple rollers. The strip steel is gradually rolled up to form a circular billet with an open gap. The amount of pressurization of the squeeze roller is adjusted so that the weld gap is controlled at 1~ 3mm, and make the weld ends flush. 　　1. If the gap is too large, then the proximity effect is reduced, the eddy current heat is insufficient, and the weld intergranular joint is poor and unfused or cracked. 　　2. If the clearance is too small, the proximity effect will increase, the welding heat will be too large and the welding seam will be burned; or the welding seam may be squeezed and rolled to form a deep pit, which will affect the surface quality of the weld. 　　After the two edges of the tube are heated to the welding temperature, under the extrusion of the squeezing roll, common metal crystal grains are formed to infiltrate and crystallize with each other, finally forming a firm weld. If t...

　　The application of ssaw steel pipe production equipment in many modern machines is precisely because of this, it only shows the important role of welded pipe units. Whether it is in the car or in the ship has a large number of applications, especially in Germany and China's cooperation in the production of this major case of the ship, fully illustrates the important role of spiral pipe production equipment. 　　From the structural point of view, ssaw steel pipe production equipment is to roll low-carbon structural steel or low-alloy structural steel steel strip into tube blanks according to a certain helix angle, and then weld the tube seams together. In the production, narrow diameter steel strips can be used to produce large-diameter steel tubes. Generally, such welded tube units are used in oil and natural gas transmission pipelines. The general process flow is: main processes such as unwinding, rolling up, leveling, butt welding, milling, forming, internal welding, external ...

　　In 316 stainless steel tube welding process we should distinguish between the bottom of the bow coating, choose to use their own welding materials for welding. In order to ensure the corrosion resistance of the coating, the weld composition of the coating should be as same as the coating steel composition, but at the boundary between the two layers, the coating must be diluted by the bottom layer to reduce or embrittle the corrosion resistance; while the bottom layer It is alloyed and becomes brittle. Therefore, the key to welding stainless steel plate is to deal with the welding of two parts of the border. The approach is to deal with the transition weld between the bottom and the cladding. 　　Post-weld heat treatment welded components of large-thickness stainless steel wrenches post-weld heat treatment eliminate residual stresses in the weld. However, it should be noted that when heat treatment temperature high, on the side of the carbon steel will form the decalcification of the ...

　　Seamless steel tubes are very useful in the industrial category. There are many types of pipe materials, including small-diameter seamless steel pipes, seamless steel pipes, detailed seamless steel pipes, etc. At the same time, it can be used. The size of the caliber is classified. Whether it is a seamless steel pipe with steel as an important material, the more prudent alloy pipe material, the practicality is extremely wide. They are widely used in pipeline transportation. Generally, large-diameter seamless steel pipe materials are used, which is inconsistent with the popular seamless steel pipes. 　　The seamless steel pipe industry has grown rapidly in the past few years. Why is it so? At first, because of the wide range of applications of this type of pipe material, the demand for seamless steel pipes continues to increase, and the demand for this type of pipe material continues to grow. At the same time, it is gradually familiar with its actual and popular pipe materials. The ad...

　　 Stainless steel fittings installation mainly has the following 9 notes: 　　1, Stainless steel lifting, can not be in direct contact with other metals, should be added pad wood or rubber sheet and other non-metallic materials. 　　2, Shelf tube cutting is not allowed to use ordinary grinding wheel cutting, stainless steel grinding wheel or plasma cutting should be used. 　　3, Stainless steel pipe and shelf pipe welding positioning welding should be carried out inside the argon protection. 　　4, Starting and closing arc, starting arc back welding, arc should be filled arc crater. Arc must be completed in the groove, prohibit the pipe, pipe fittings base surface arc and arc. If the arcing and arc collector found pores, cracks and other defects should be promptly handled clean. 　　5, Stainless steel pipe, fittings and stainless steel pipe, pipe fittings and non-stainless steel pipe, shelf pipe connections, welded butt joints before backing welding tube and the cavity should be fill...

　　316 stainless steel welded tube surface deposits of deposits containing other metal elements of dust or heterogeneous metal particles in the humid air, the condensate between the attachment and stainless steel, the two connected into a micro-cell, triggering the electrochemical reaction, protective film damaged, called electrochemical corrosion. Organic stainless steel tube surface adhesion of organic juice (such as vegetables, noodles soup, sputum, etc.), in the case of water oxygen, organic acids, organic acids for a long time on the metal surface corrosion. Stainless steel pipe surface adhesion contains acid, alkali, salt substances (such as the renovation of the wall of alkali water, lime splashing), causing local corrosion. In polluted air (such as a large amount of sulfide, carbon dioxide, nitrogen oxides in the atmosphere), the case of condensate, the formation of sulfuric acid, nitric acid, acetic acid point, causing chemical corrosion. 　　The above situation is caused by t...

　　904L stainless steel is a low-carbon high-alloy austenitic stainless steel material. The steel is developed for use in non-oxidizing solutions such as sulfuric acid and is also suitable for use in neutral chlorine-containing (pitting-prone) environments and in environments susceptible to crevice and stress corrosion cracking. 　　904L is a single phase austenitic stainless steel with good weldability. Due to its high molybdenum content and the specially designed low-impurity-content consumables, the filler metal, although single-phase austenite, prevents hot cracking during the welding process. 　　904L complies with the following standards: SS2562, DIN1.4539, ASTM N08904 and NFZ1 NCDU25-20. 　 　Thermoforming: 　　This material is easy to thermoforming, but care must be taken to keep the thermoforming temperature between 950-1200 °C. Excessive temperature will reduce the forming ability of the steel, and the forming speed in the heating range will be accelerated. 　　If the final mo...

　　Forming method of circular tube is called bending, and the forming method of the rectangular tube is called buckling. There are two basic ways to bend forming: solid bending and empty bending. 　　1, Real bend 　　Real bend, as the name suggests is the compaction of the bend, the actual time when the inner and outer roller and tube billet two-way compaction. 　　1) The advantage of solid bending is small rebound, forming accurate, and as long as the roller type is accurate, the angle of the inner corner of the R is more accurate. 　　2) The disadvantage of real bending is the stretching / ironing effect. First, the actual bend will make the bend at the tensile, stretch effect so that the longitudinal length of the bend line shortened; Second, the real bend bending metal thinning due to stretching. 　　2, Empty bend 　　Blank bending through the outer roller and the outer wall of the tube to form a one-way contact bending moment to strip material bending, empty bend will make the bend...

　　Thin-walled stainless steel tube refers to the ratio of wall thickness to diameter is not more than 6%, and the thin-walled stainless steel tube is a kind of steel pipe, normally, the wall thickness of 0.6 ~ 2.0mm stainless steel or stainless steel plate, with automatic welding and other welding process made of pipe. Mainly used for building water supply and direct drinking water pipes . 　　Thin-walled stainless steel tubing has the following outstanding advantages: 　　1, To meet the health requirements of thin-walled stainless steel tube will not cause secondary pollution of water quality, to meet the national direct drinking water quality standards. 　　2, Thin-walled stainless steel tube is a fully recyclable water pipe. 　　3, Thin-walled stainless steel tube material strength is higher than all the water pipe material, greatly reducing the water pipe by the impact of the possibility of external leakage, a lot of water conservation. 　　4, Thin-walled stainless steel tube corro...

　　Threaded connection is through the internal and external pipe thread rotation will be connected to a stainless steel tube as a whole, the opposite threaded connection, usually in the other stainless steel pipe end of the processing of external thread, screw on the pipe with internal thread Accessories, and then connected with other pipe, constitute the pipeline system. 　　Stainless steel pipe thread connection is mainly used in the following cases: 　　① Galvanized welded steel pipe connection. 　　② Design documents or construction acceptance norms allow non-galvanized welded steel pipe connections, such as water supply and drainage, heating, gas, compressed air branch and so on. 　　③ Connection of pipe and thread valve, instrument accessory and mechanical pipe nozzle with pipe. The pitch of the cylindrical pipe thread, the length of each thread, the length of the thread, the length of the thread, the working length of the thread and the working height are equal to those of the c...

　　 Seamless stainless steel pipe is actually a hollow cross section and both sides of the expansion of the resistance to air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical corrosion medium corrosion of steel pipe. Also known as acid-resistant stainless steel. Stainless steel pipe suppliers are reputable to protect the environment from hygienic, cheap, and also thinner tubes as well as new, reliable, and effective ways to improve a simple and convenient connection, resulting in more irreplaceable benefits. There will be more and more engineering use, is more and more and prospects. 　　Features of seamless stainless steel pipe: 　　First, the thicker the wall thickness of the solution, it is really more cost effective and wise, the thinner the wall thickness, and its processing costs will appreciate sharply; 　　Second, from the process of the product determines its limitations, from the general seamless steel pipe with low accuracy: wall thickne...

　　Steel pipes are classified into two types: seamless steel pipes and welded steel pipes according to their manufacturing methods. The seamless steel pipe is made of high-quality carbon steel or alloy steel and has hot rolling and cold rolling (extraction). The welded steel pipe is formed by welding a steel plate rolled into a tubular shape by a seam or a spiral seam. In terms of the manufacturing method, it is further divided into a welded steel pipe for low-pressure fluid transportation, a spiral-welded electric steel pipe, a direct-wound welded steel pipe, an electric welded pipe, and the like. Seamless steel tubes can be used in a variety of liquids, gas pipelines, and the like. Welded pipes can be used for water pipes, gas pipes, heating pipes, etc. 　 　1. Welded steel pipe 　　1.1 Welded steel pipe and galvanized welded steel pipe for low pressure fluid transportation 　　The welded steel pipe for low-pressure fluid transportation is made of carbon soft steel. It is the most com...