steel pipe

　　The same is a large-diameter seamless steel pipe , but in the use of the product, there will be a difference in the relative use, then in the use of this product, because of their own quality gap, in use, there will be what is the difference? 　　First of all, it is the adaptability difference in the use environment. In the use of products, there are often downline manufacturers who do not meet the requirements on this product. In such cases, it is naturally difficult to Users will be satisfied when they are using. 　　Because some environments are more serious in corrosion, but manufacturers do not use anti-corrosion materials in production, or they do not have the advantages they deserve in other people. Therefore, there is no quality on large-diameter LSA pipes. At the same time, there is also a relative difference in the tension that it is subjected to, so this is what the user needs to pay attention to. Of course, there is another problem, that is, In the production of products,...

　　In the carbon steel pipe manufacturing process, quality control of the carbon steel pipe manufacturing production process is monitored from manufacturing materials, processes, welding, non-destructive testing, metering, tooling, etc. How do you ensure the flatness and overall deviation of the carbon steel pipe during assembly? 　　1. Bend pipe assembly: The elbow pipe is a special pipe section. Excessive error in its external dimensions will bring certain difficulties to the installation. Therefore, it requires an overall assembly. 　　2, To improve the welding process: to take a small range of welding, especially the first layer of welding, increase the level of welding, in order to reduce the welding deformation, reduce the size of steel pipe deviation. 　　3, Straight pipe butt method: In the welding of the trolley, the first adjustment of the gap, wrong teeth, the overall size inspection, after the inspection pass a total spot welding. 　　4. Improve the groove design: Use an as...

　　1, With outstanding mechanical features, superior wear resistance, surface thin and dense chromium-rich oxide film, making the stainless steel tube in all water, including soft water, have outstanding corrosion resistance, even if the use of buried there excellent corrosion resistance. Stainless steel pipe(ss pipe) can be filled with high-speed water erosion of up to 30m / s. It is used in the diversion stainless steel pipe of the high-head power plant. The water velocity at the end of the nozzle reaches 60m / s or above, and there is still more than 100 years of service life. 　　2, Tensile strength greater than 530 N / mm, is 2 times the galvanized pipe, 3-4 times the brass, PPR pipe 8-10 times, and has outstanding ductility and resistance, help to save water, Surface is beautiful, clean, fashion, 100% recyclable, safe and clean, good temperature resistance, good thermal insulation, smooth wall water resistance is small, able to long-term safety at -270 ℃ -400 ℃ temperature Homewo...

　　1, Hot-rolled 304 stainless steel pipe (ss pipe) is generally produced on the initiative of rolling units. The solid tube is examined to eliminate appearance defects, cut to the required length, center on the end surface of the tube perforation end, and then sent to heating furnace heating, perforation in the piercing machine. In the continuous rotation with the perforation and travel, the effect of the roll and the head, the tube gradually form a hollow interior, said capillary. Then sent to the active rolling mill continuous rolling. After the whole machine by the whole wall thickness, sizing, to meet the regulatory requirements. It is a more advanced method to produce hot-rolled seamless steel pipe by using continuous pipe mill. 　　2, If you want to obtain smaller and better quality seamless pipe, you must use cold-rolled, cold drawn or a combination of both. Cold rolling is usually carried out on a two-roll mill. The steel is rolled in an annular groove of variable cross-section...

　　Major characteristics of stainless steel pipe (ss pipe): weldability, corrosion resistance, polishing performance (BQ sex). 　 　Weldability 　　Different uses of the product have different welding performance requirements. A class of tableware on the welding performance generally do not require, and even part of the pot companies. However, most products require raw material welding performance, such as two types of tableware, mugs, steel pipes, water heaters, drinking fountains and so on. 　　Corrosion resistance 　　Most stainless steel products require good corrosion resistance, stainless steel tube as a second class tableware, kitchen utensils, water heaters, drinking fountains, etc., some foreign businessmen also do corrosion testing on the product: heating with NACL solution to boiling for a period of time after the solution is drained, washed and dried, the weight loss is determined to determine the degree of corrosion (note: due to the composition of the abrasive cloth or san...

　　1. Heat transfer performance: the generator condenser, when the cooling tube material by the stainless steel instead of the navy brass, the heat change: heat transfer tube on both sides of the exothermic conditions, that is, both sides of the exothermic form and release The same thermal coefficient, only the heat transfer tube material and wall thickness caused by wall resistance changes, but the wall thickness of the change is relatively small. 　　2. Tube beam vibration problem: stainless steel material strength and elastic modulus are higher than copper. However, due to the original tube seismic calculation is based on the natural frequency of the tube to avoid the steam turbine speed of 3000 rev / sec caused by the resonance, so that the distance between the partitions is relatively large. And now the tube vibration calculation is based on the United States HEI standard on the prevention of steam flow excitation empirical formula, that is, the steam turbine exhaust to the speed o...

　　 Stainless welded steel pipe in the same size specifications, the smaller the size of the tolerance, the higher the accuracy of processing. Therefore, in order to ensure the cutting effect of stainless welded steel pipe, the actual size should be controlled within the allowable range, that is, to design a reasonable size tolerance. 　　In the stainless welded steel pipe cutting process, some operators do not achieve the desired cutting effect, but can not find the specific reasons, spring that, it may be because there is no consideration of stainless steel pipe cutting dimensional tolerances. In the actual processing, due to processing and other factors, after cutting the actual situation and expected there may be some error. 　　Stainless stainless steel pipe in the cutting before the first to analyze the hardness, thickness, (nor exclude the analysis of the ductility test), and then the machine cutting accuracy, stability and saw blade flatness, stability and other comprehensive a...

　　Seamless steel pipe is a long strip of steel with a hollow section and no joints around it. It is widely used in pipelines for conveying fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe has light weight and is an economical section steel with the same bending and torsional strength. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmissions. Shafts, bicycle frames and steel scaffolding used in construction. 　　The use of seamless steel tubes to manufacture ring-shaped parts can improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and nowadays are widely made of seamless steel pipes. Steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are al...

　　Thin wall stainless steel tube is generally used for civilian areas, water supply, construction area is relatively large, his pressure and corrosion resistance requirements are lower than the requirements of stainless steel industrial pipe. 　　The advantages of thin wall stainless steel tube are as follows: 　　Friction resistance: the inner wall smooth, large flow; 　　Impact resistance: tensile strength is 2 times the steel pipe , brass 3 times; 　　Economy: comprehensive performance, and can effectively control the pipe network leakage rate; from the product life cycle cost point of view, the economy is more significant. 　　Good sealing performance: stainless steel pipe system with a long life and long life with the building, so people in the choice of pipeline products on the life of stainless steel pipe without the slightest concern, we are most concerned about the weak parts of the stainless steel pipe - Performance and longevity. Adhesive TIG welding connection to learn the ...

　　 201 stainless steel welded pipe welding method 　　Gas shielded welding: mainly refers to the TIG welding, melting TIG welding and carbon dioxide (CO2) gas shielded welding. TIG welding arc stability, the use of small current welding thin pieces, and can be single-sided welding double-sided molding welding, so in the boiler and pressure vessel manufacturing and installation works have been widely used. Commonly used in the small diameter of the boiler 230 stainless steel welded pipe , cylindrical containers and pipe girth seam welding. The use of special rotating mechanism can also automatically welding the boiler and heat exchanger tube plate structure of the weld. Melt argon arc welding is often used to weld thin-walled 201 stainless steel welded pipe and alloy steel containers. Fused pole pulse argon arc welding is mainly used in small diameter thick-walled pipe butt welds and thick-walled components on the narrow gap weld. 　　Electron beam welding: has been applied to pressure ...

　　Technical requirements for stainless steel tubes are following below: 　　(1) Good corrosion resistance. The most basic requirements for stainless steel tube is corrosion resistance, that is, according to the use of different conditions, requiring steel pipe can withstand general corrosion, intergranular corrosion, point corrosion, stress corrosion. For the largest amount of austenitic stainless steel tube, resistance to intergranular corrosion is often the most basic requirements. 　　(2) Good processing performance differences. Stainless steel tube in the use of the process, most of the need for elbow, expansion and other processing, anti-corrosion steel pipe, so the steel pipe has a good flattening, flaring and other work performance. 　　(3) Good welding performance. Stainless steel tube for a large number of fluid pipeline, in use, anti-corrosion steel pipe welding is very large, the quality of each weld is very strict, responsible for causing a major accident. 　　(4) Good org...

　　Industrial use of stainless steel pipe according to the metallographic organization can be divided into three categories: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel. It can be the characteristics of these three types of stainless steel (as shown in the table below), but it should be noted that the martensitic stainless steel is not all can not be welded, but only by certain conditions, such as welding should be preheated after welding should be high temperature temper so that the welding process is more complex. The actual production of some martensitic stainless steel such as 1Cr13, 2Cr13 and 2Cr13 and 45 steel welding or more. 　　Ferritic stainless steel also belongs to chrome stainless steel 　　Low carbon content, anti-atmospheric, nitric acid and saline solution corrosion ability, high temperature oxidation resistance and so on. Mainly used in the production of chemical equipment in the container, pipe. 　　Austenitic stainless steel is c...

　　The production quality of stainless steel welded pipe is affected by many factors, including the environmental factors of the production site, stainless steel welded pipe manufacturers in the product quality control can not be ignored when the impact of this part. Here to talk about stainless steel welded pipe production environment control requirements: 　　1. Stainless steel welded pipe production need to have an independent production workshop or special fixed production site, stainless steel raw materials to ensure that a separate storage, can not be mixed with carbon steel. 　　2. Stainless steel welded pipe raw materials and semi-finished products in the process of turnover and transportation, should be equipped with the necessary anti-ferrous ion pollution and knock injury, scratched transport tooling. 　　3. Stainless steel welded pipe welding site is not allowed to wear a wind, to avoid the wind, rain, snow direct impact, the temperature is not less than -5 ℃. 　　4, stainle...

　　Galvanized iron is iron which has been coated in a layer of zinc to help the metal resist corrosion. Steel can also be galvanized. When metal is going to be used in an environment where corrosion is likely, it is often galvanized so that it will be able to withstand the conditions. Even with galvanization, however, corrosion will eventually start to occur, especially if conditions are acidic. 　　There are two primary techniques which can be used to make galvanized iron. The most common is hot-dip galvanization, in which the iron is moved through an extremely hot bath of molten zinc, which may be mixed with small amounts of lead, depending on the circumstances. When the iron emerges from the bath, the zinc will have bonded, creating a layer of zinc on the surface of the iron. Sometimes, the metal may be passed through a mill to flatten and even out the coating. Another technique which can be used is electrodeposition, also known as electroplating, although this is rare.Once galvanize...

　　304 stainless steel seamless pipe blanks by quality, observed macroscopic fracture morphology analysis of the heating system and hot tube perforation occurred in pickling and cold working process, the analysis of the 304 stainless steel seamless pipe processing fracture causes. Noted rational selection process and adherence to the rules will reduce steel processing fracture. It made a number of concrete measures to prevent the occurrence of processing 304 stainless steel seamless pipe breakage. 　　Pickling) machining quality and yield, so hot piercing is one of the most critical step 304 stainless steel seamless pipe processing. The main factors affecting the quality of the thermal perforation are: billet heating system, perforated front billet temperature punch roll speed and penetration rates, capillary size and specifications .... stainless steel, etc., especially when the heating temperature and billet piercing machine when the roll speed selection unreasonable, in addition to ...