With the implementation of China's reform and opening up, the national economy has achieved rapid growth, and a large number of urban houses, public buildings and tourism facilities have been built, which puts forward new requirements for hot water supply and domestic water supply. In particular, people pay more and more attention to the problem of water quality, and the requirements are also increasing. Galvanized steel pipe, a common pipe will gradually withdraw from the historical stage under the influence of relevant countries because of its corrosivity. Plastic pipe, under certain circumstances composite pipe and copper pipe have become common pipes in the pipeline system. However, stainless steel pipe has more advantages, especially the stainless steel pipe with wall thickness of only . ~ mm. In high-quality drinking water system, hot water system and water supply system that puts safety and sanitation first, it has the characteristics of safety, reliability, sanitation, environmental protection, economy and applicability. It has been proved by engineering practice at home and abroad that it is one of the new, energy-saving and environmental protection pipes with good comprehensive performance of water supply system. It is also a very competitive water supply pipe, which will play an incomparable role in improving water quality and people's living standards.The American Iron and Steel Institute uses three digits to identify various standard grades of malleable stainless steel. Among them, austenitic stainless steel is marked with numbers of and series. For example, some ordinary austenitic stainless steel is marked with and.Knokke-Heist,　　— The addition of sulfur improves the processability of the material.Corrosion resistance of decorative stainless steel pipe the price of different series of stainless steel materials varies greatly. The corrosion resistance of more economical materials can not meet the higher application requirements, and the improvement of corrosion resistance of stainless steel materials by simple chemical passivation is limited. On the other hand, and the passivation treatment of stainless steel has turned to the direction of environmental friendliness. Recently, citric acid passivation and silicon treatment on stainless steel surface have become a new research direction. The former has environmental protection characteristics because its passivation solution component does not contain chromium salt. The latter has found that silicon coupling agent is chemically adsorbed on the metal surface to form a protective silicon film with cross-linked network structure. The length of discoloration time of samples after different surface treatments was compared by blue dot method, the corrosion rate of samples after different surface treatments was distinguished by brine immersion test, and the salt spray resistance of samples after different surface treatments was distinguished by neutral salt spray test The differences of pitting corrosion resistance and resistance to corrosive medium of samples after different surface treatment were compared by electrochemical test. The film thickness of silicon film was indirectly characterized by film weight test, energy spectrometer,Knokke-HeistStainless steel water tank plate factory, X-ray diffraction X-ray photoelectron spectroscopy and total reflection Fourier transform infrared spectroscopy characterized the surface films of different surface treated samples, and analyzed the structural composition and corrosion resistance mechanism of different films. Professional stainless steel plate, stainless steel coil, stainless steel belt, stainless steel pipe, high price, service, on-site settlement, honest management! At present, there are few studies on the combination of citric acid passivation and silicon treatment of stainless steel. Therefore, this paper studies the difference of corrosion resistance of martensitic stainless steel Cr chemical passivation, silicon treatment and the combination of citric acid passivation and acid silicon system treatment, and discusses the corrosion resistance mechanism of different films on its surface, which can provide reference for the new direction of stainless steel surface treatment, It has certain practical guiding significance. The corrosion resistance and mechanism of chemical passivation, silicon treatment and composite treatment of martensitic stainless steel were studied in this paper. The comprehensive comparison of the research results shows that the corrosion resistance of stainless steel treated with different surface treatments is different. The corrosion resistance of the sample treated with silicon alone is better than that treated with traditional dichromate passivation. The corrosion resistance of the composite treated sample treated with citric acid passivation and acid silicon system is further enhanced than that treated with acid silicon system alone. The composite treatment of citric acid passivation and acid silicon system treatment has excellent corrosion resistance and environmental protection characteristics, and is expected to replace the traditional dichromate passivation treatment. According to the film weight test results, the surface silicon film weight of the composite treated sample after citric acid passivation and acid silicon system treatment is lower than that of the sample after acid silicon system treatment alone indicating that the excellent corrosion resistance of the composite film not only depends on the surface silicon film,Welding, high frequency preheating plus three torch argon arc welding, high frequency preheating plus plasma argon arc welding. The progress of combined welding is very significant. As for the combined welding of steel pipe with high-frequency preheating, the weld quality is equivalent to the conventional argon arc welding and plasma welding, the welding operation is complex, and the whole welding is easy to complete automation. This combination is easy to connect with the existing high-frequency welding equipment, but because chromium is an integral part of steel, the protection is different.When using this method, it should be noted that the water-soluble paper should be double-layer and must be pasted well, otherwise it is easy to cause damage and fall off of the water-soluble paper, resulting in loss of argon protection of the inner weld and oxidation, resulting in cutting of the weld junction and re welding, the water-soluble paper should be strictly checked and pasted before welding.

The protection mechanism of stainless steel backing wire + TIG process is that the back weld is protected by the metallurgical reaction of slag produced by welding wire melting and its alloy elements, and the front weld is protected by argon, slag and alloy elements.Seamless steel pipe): round billet & rarr; Heating → Perforation & rarr; Three roll cross rolling, continuous rolling or → Off pipe & rarr; Sizing (or reducing) → Cooling → Straightening & rarr; Hydrostatic test (or flaw detection) → Mark & rarr; The raw material for warehousing and rolling seamless pipe is round pipe blank. The round pipe blank shall be cut and processed by cutting machine, and the blank with a growth of about m shall be brought to the furnace for heating. The billet is sent to the furnace for heating at a temperature of about degrees Celsius. The fuel is hydrogen or acetylene. The temperature in the furnace is the key problem. After the round tube billet is discharged from the furnace, it should be pierced through the pressure piercer. Generally, the more common piercer is the cone roll piercer. This piercer has high production efficiency and good product quality. It is specialized in stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe, with high pressure resistance grade, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection, long service life, large perforation diameter expansion, and can wear a variety of steel grades. After perforation, the round tube blank is successively rolled by three roll cross rolling, continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing, the steel pipe enters the cooling tower for water spray cooling. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydrostatic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. Steel pipes should be strictly selected manually after quality inspection. After the steel pipe is inspected, the number, specification, production batch number, taking yield point of %, mm; D - Nominal outer diameter of steel pipe, mm.Online consultation,The corrosion resistance of stainless steel depends on chromium, but because chromium is an integral part of steel, the protection is different.When hoisting stainless steel pipes, public slings, such as hoisting belt and public collet number, it shall prevent scratching caused by impact and collision. If there are surface scratches, electric arc traces and surface purification in the process of transportation,Knokke-Heist1 cm thick stainless steel plate, storage and processing it must be completely cleaned, polished with an angle grinder, and then polished Polishing with optical sheet or metallographic sandpaper.According to the purpose, it can be divided into oil well pipe (casing, oil pipe and drill pipe), pipeline pipe, boiler pipe, mechanical structure pipe hydraulic prop pipe, gas cylinder pipe, geological pipe, chemical pipe (high-pressure chemical fertilizer pipe, petroleum cracking pipe) and marine pipe.

Vickers hardness stainless steel pipe Vickers hardness test is also an indentation test, which can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of Brinell and Rockwell methods and overcomes their basic disadvantages, but it is not as simple as Rockwell method. Vickers method is rarely used in steel pipe standards.quality standard,Standard classification - classification: national standard GB industry standard Yb local standard enterprise standard qcb- classification: product standard packaging standard basic standard - standard level (divided into three levels): y level: international advanced level I level: international general level H level: domestic advanced level - national standard: stainless steel bar (level I) gb- stainless welding disc Park (level H)Difference between L stainless steel pipe and stainless steel pipe: and L stainless steel are molybdenum containing stainless steel. The molybdenum content of L stainless steel is slightly higher than that of stainless steel. Due to the molybdenum in the steel, the overall performance of this steel is better than that of and stainless steel. Stainless steel has a wide range of applications under high temperature conditions when the concentration of is lower than % and higher than %. In addition, stainless steel also has good chloride corrosion performance, so it is usually used in marine environment. The large carbon content of L stainless steel is ., which can be used in applications where annealing cannot be carried out after welding and great corrosion resistance is required.The accumulation of organic impurities caused by decomposition products and the pollution of some other metal impurities. There is no turnover of long-term stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe to avoid price difference. The price is % higher than the market price! The price of more than one ton is higher! So that the nickel bath can not get the ideal bright nickel coating, it is necessary to carry out large-scale treatment. In the solution of bright nickel plating on stainless steel pipe, the brightener has developed rapidly and has many varieties. To sum up, the development of brighteners has experienced four generations. Instead of the original product, saccharin and butynediol can be plated with bright nickel with high flatness. Its application flourished in the s and s. It seems that due to the instability of butynediol in the nickel plating bath, short service life and rapid accumulation of organic impurities, the nickel bath needs to be treated frequently. Therefore, epoxy chloropropyl or epoxy is branched with butynediol to synthesize the second-generation nickel plating brightener, such as b brightener. The situation has improved. Be and retain alkynyl. Later, pyridinyl is polymerized to form the third-generation product, Faster light output, less amount of brightener and longer service life. Now it further uses various combinations of nickel plating brightener intermediates to form a new brightener, which has developed to the fourth generation of products. It has less use, faster light output speed and longer treatment cycle. According to the connection and rolling process,Knokke-Heist316L stainless steel round pipe, stainless steel pipes with deep plating capacity mainly include hot-rolled, hot-rolled and cold drawn (rolled) stainless steel pipes. According to the difference of metallographic structure of stainless steel, it mainly includes semi Ferritic and semi martensitic stainless steel pipe, martensitic stainless steel pipe, austenitic stainless steel pipe, austenitic ferritic stainless steel pipe, etc.Knokke-Heist,Body austenitic stainless steel seamless steel pipe and welded steel pipe stainless steel pipe for mechanical structure stainless steel pipe for ordinary pipe stainless steel pipe for boiler, stainless steel pipe for heat exchanger and seamless steel pipe for chemical industry (crnit) qhyad crnimosi duplex stainless steel seamless steel pipe. Stainless steel is mainly used in the automobile industry, accounting for more than % of the total consumption of automobile stainless steel, and % is ferritic stainless steel. The exhaust gas produced by automobile engine is from the rear of intake pipe, front pipe, hose converter and center pipe. The common steel grades of exhaust system are L, l, etc. it is mainly used in automobiles Stainless steel welded pipe. It is estimated that the stainless steel pipe used in automobile accounts for about % of the consumption of stainless steel pipe in the whole downstream. L stainless steel pipe, s stainless steel pipe and L stainless steel pipe are provided for a long time. The products are complete, excellent quality and favorable price. The use ratio of stainless steel pipe and welded pipe is about :. Series & mdash; Heat resistant chromium alloy steel.The operators are mainly plumbers and argon arc welders, with the cooperation of other types of work and the argon arc welder shall have the certificate issued by relevant departments.