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    Stainless steel profiled tube


    Stainless steel pipe is a kind of hollow long circular steel, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial transportation pipelines and mechanical structural components. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also often used in the production of conventional weapons, barrels, shells and so on.
    Stainless steel pipe can be divided into ordinary carbon steel pipe, high quality carbon steel pipe, alloy structure pipe, alloy steel pipe, bearing steel pipe, stainless steel pipe and bimetal composite pipe, coating and coating pipe to save precious metals and meet special requirements. Stainless steel pipes have many kinds and different uses, different technical requirements and different production methods. At present, the outer diameter and wall thickness of steel pipes are 0.1-4500 mm and 0.01-250 mm respectively. In order to distinguish its characteristics, steel pipes are usually classified according to the following methods.
    Mode of production
    Stainless steel pipes can be divided into seamless pipes and welded pipes according to the mode of production. Seamless steel pipes can also be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold-drawn and cold-rolled pipes are the secondary processing of steel pipes. Welded pipes can be divided into straight-welded pipes and spiral-welded pipes.
    Section shape
    Stainless steel pipes can be divided into round pipes and special-shaped pipes according to their cross-sectional shapes. There are rectangular, rhombic, elliptical, hexagonal, octagonal and various cross-section asymmetrical tubes. Profiled tubes are widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, special-shaped tubes generally have larger inertia moment and section modulus, and have greater flexural and torsional resistance, which can greatly reduce the weight of the structure and save steel.
    Stainless steel pipes can be divided into equal section pipes and variable section pipes according to their longitudinal shape. Variable cross-section pipe has conical pipe, ladder pipe and periodic cross-section pipe, etc.
    Tube End Shape
    Stainless steel pipe can be divided into smooth pipe and threaded pipe according to the state of pipe end. The threaded pipe can be divided into ordinary threaded pipe (conveying water, gas and other low-pressure pipes, using ordinary cylindrical or conical pipe threaded connection) and special threaded pipe (petroleum, geological drilling pipe, for important threaded pipe, using special threaded connection), and some special threaded pipe, in order to compensate for the impact of threaded pipe end strength. The end of the pipe is usually thickened (inner, outer or inner) in front of the wire.
    Classification of uses
    It can be divided into oil well pipes (casing, tubing and drill pipe, etc.), pipelines, boiler pipes, mechanical structure pipes, hydraulic prop pipes, cylinder pipes, geological pipes, chemical pipes (high pressure fertilizer pipes, petroleum cracking pipes) and marine pipes.

    Stainless steel industry in Wenzhou
    Wenzhou stainless steel industry is a new industry, which originated in the early 1980s. After 20 years of exploration and development, it has gained considerable popularity and influence in the domestic market.
    At present, there are more than 130 production enterprises, which have a good momentum of development and expansion. There are 38 piercing equipments in the whole industry. There are more than 500 cold rolling and drawing equipments and 6 smelting equipments, all of which adopt out-of-furnace refining, and other equipments are relatively complete. The production capacity and scale of enterprises are constantly expanding and enhancing. In 2001, there were 5 enterprises with output value exceeding 100 million yuan, and more than 10 enterprises were rated as star-rated enterprises in cities and districts. In order to ensure product quality, water pressure, eddy current, ultrasonic flaw detection, direct reading spectrometer and other analysis and detection equipment are constantly increasing and improving. In 2001, the qualified rate was more than 80% after sampling and testing by the higher technical supervision department. With more than 300 technicians and managers with various titles, enterprises are gradually on the track of standardized production and management. Wenzhou stainless steel industry mainly produces stainless steel pipes and rods, with more than 400 varieties, specifications and models. In 2001, the sales volume of stainless steel reached 1.715 billion yuan and the output reached 106,000 tons. Stainless steel bar 222 million yuan, output 21.1 million tons, handed in more than 100 million national taxes. The export volume of steel pipes has also increased year by year, with 5000T in 2001. It is estimated that this year's export volume will be 8000-10000T. More than 10 enterprises have obtained the right to import and export by themselves. Stainless steel pipes are exported to dozens of countries and regions in Southeast Asia and the European Union, and are highly appreciated by foreign businessmen and users.
    The stainless steel pipe industry in Wenzhou was blank, developing rapidly and expanding in scale, but there is still a certain gap in production capacity, which still can not meet the needs of the domestic market. The future development ideas and specific practices of Wenzhou stainless steel industry are as follows:
    _With the goal of improving the output of products as the center, strengthening the internal management of enterprises and improving the scale and grade of enterprises, Wenzhou stainless steel pipe and enterprise's popularity will be further enhanced, enterprises will be encouraged to develop into groups, the introduction and training of technicians and managerial personnel will be strengthened, the construction of production equipment will be strengthened, and the products will be guaranteed and improved. Quality.
    _Towards the road of brand development, the number of Wenzhou stainless steel industry and entrepreneurs'credit, shaping China's brand awareness.
    (5) Establish Wenzhou Stainless Steel Pipe Production Zone, gather stainless steel production enterprises, make them scale up, grade up, lead up and create famous brands, form group production; through mergers, affiliation, equity participation and joint ventures, realize the "key development" planning goal of Zhejiang Economic and Trade Department.
    _Running Wenzhou stainless steel professional market well. Stainless steel industry develops rapidly, but because there is no certain scale of professional market, it can not attract customers from all over the world, so the production enterprises can only set up locations throughout the country, which not only increases the cost of enterprises, but also hinders the development of enterprises. If a specialized market is built, which integrates production, sales and service, the production enterprises will truly base themselves on the back ground, go to the whole country and rush out of the country.
    This kind of steel pipe can be divided into stainless seamless steel pipe and stainless steel welded steel pipe (seamless pipe), according to the different manufacturing process can be
    Stainless steel pipe
    Stainless steel pipe
    For: hot rolling, extrusion, cold drawing and cold rolling these basic types, according to the cross-section shape can be divided into circular pipe and special-shaped pipe, widely used is circular pipe, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and other special-shaped stainless steel pipe.
    Hydraulic tests should be carried out to test the pressure resistance and quality of steel pipes under fluid pressure. No leakage, wetting or expansion will occur under the prescribed pressure to qualify. Some steel pipes also need to carry out edge rolling test, flattening test and flattening test according to standards or requirements of the demand side.
    Seamless stainless steel tubes, also known as stainless steel seamless tubes, are made of steel ingots or solid billets through perforation, and then hot-rolled, cold-rolled or cold-drawn. The specification of seamless steel pipe is expressed by millimeter number of outer diameter * wall thickness.
    201 Stainless Steel Pipe - S20100 (AISI. ASTM)
    304 stainless steel pipe full name SUS304 stainless steel pipe
    SUS304 stainless steel pipe belongs to the stainless steel pipe of American brand. The domestic brand is equivalent to 0Cr19Ni9 stainless steel pipe, which is usually replaced by 0Cr18Ni9 stainless steel pipe.
    The anti-rust mechanism of stainless steel is that alloy elements form positive potential and no longer have the ability to transport electrons to oxidizers.
    The rusting of 304 materials may be caused by the following reasons:

    _There are chloride ions in the environment.
    Chloride ions are ubiquitous, such as salt, sweat, sea water, sea breeze, soil and so on. Stainless steel corrodes rapidly in the presence of chloride ions, even more than ordinary low-carbon steel. The chloride ion forms a complex with Fe in alloy elements, which reduces the positive potential of Fe and is oxidized by oxidizing agent after Depriving electrons.
    Therefore, there are requirements for the use of stainless steel environment, and often need to wipe, remove dust, keep clean and dry.
    316 and 317 stainless steels are molybdenum-containing stainless steels. The molybdenum content of 317 stainless steel is slightly higher than that of 316 stainless steel. Because of molybdenum content in 316 stainless steel, the overall performance of 316 stainless steel is better than that of 310 and 304 stainless steel. At high temperature, 316 stainless steel has a wide range of uses when the concentration of sulphuric acid is lower than 15% and higher than 85%. 316 stainless steel also has good chloride resistance, so it is usually used in marine environment.
    With the development of social economy, the application of stainless steel pipe has been more and more popular. It is bound to bring about new changes in all fields.
    The theoretical weight formula of stainless steel pipe is W= (outer diameter-wall thickness) x wall thickness x 0.02491x length, in which W is kg, outer diameter and wall thickness are m m and length is m.
    Production process
    Stainless steel welded pipe production process:
    Raw Material - Strip - Welded Pipe - Repair - Polishing - Inspection (Spray Printing) - Packaging - Delivery (Warehousing) (Decorative Welded Pipe)
    Raw Material - Strip - Welding Pipe - Heat Treatment - Correction - Straightening - Repair - Pickling - Hydraulic Testing - Inspection (Spray Printing) - Packaging - Outgoing (Warehousing) (Pipe for Pipe Piping Industry)
    hardness
    Brinell, Rockwell and Vickers are commonly used to measure the hardness of stainless steel tubes.
    Brinell hardness
    In the standard of stainless steel pipe, Brinell hardness is the most widely used. The indentation diameter is often used to express the hardness of the material, which is both intuitive and convenient. But it is not suitable for steel pipes with harder or thinner steel.
    Rockwell hardness
    Rockwell hardness test of stainless steel tube is the same as Brinell hardness test, which is indentation test method. The difference is that it measures the depth of indentation. Rockwell hardness test is a widely used method at present, and HRC is used in steel pipe standard only after Brinell hardness HB. Rockwell hardness can be applied to the determination of metal materials from very soft to very hard. It makes up for the shortcoming of the Brinell method. It is simpler than the Brinell method and can read the hardness value directly from the dial of the hardness machine. However, because of its small indentation, the hardness value is not as accurate as that of Brinell method.
    Vickers hardness
    The Vickers hardness test of stainless steel tubes is also an indentation test method, which can be used to measure the hardness of very thin metal materials and surface layer. It has the main advantages of Brinell's method and Rockwell's method, and overcomes their basic shortcomings, but it is not as simple as Rockwell's method, and Vickers method is seldom used in steel pipe standards.
    Hardness Testing
    The W-B75 Wechsler hardness tester can be used for annealed stainless steel pipes with inner diameter over 6.0 mm and wall thickness under 13 mm. The tester is very fast and simple, and it is suitable for rapid and non-destructive inspection of stainless steel pipes. The hardness of HRB and HRC of stainless steel pipe with diameter greater than 30 mm and wall thickness greater than 1.2 mm was tested by Rockwell hardness tester. Stainless steel pipes with inner diameter greater than 30 mm and wall thickness less than 1.2 mm were tested by surface Rockwell hardness tester for HRT or HRN hardness. HR15T hardness of stainless steel pipes with inner diameter less than 0 mm and larger than 4.8 mm was tested by Rockwell hardness tester. When the inner diameter of stainless steel pipe is larger than 26 mm, the hardness of the inner wall of the pipe can also be measured by Rockwell hardness tester or surface Rockwell hardness tester.

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