成年福利片在线观看-成年美女黄网站色大免费视频,琪琪午夜伦伦A片,帝王调教跪爬乳环上朝惩罚视频,91精品福利一区二区

Stainless steel and high-temperature and corrosion-resistant alloy pipes for heat exchangers, evaporators, condensers, steam condensers, and boilers are widely used in metallurgy, thermal power, nuclear power, petroleum, chemical industry, machinery, shipbuilding, petrochemical, electronics, medicine, food, environmental protection and other industries. There are corresponding standards for stainless steel pipes at home and abroad and in the industry. There are different requirements for different uses. They are products that are common in the steel pipe manufacturing industry but have relatively high processing difficulties.

The petrochemical industry involves corrosive fluids such as acids, alkalis, and salts. Stainless steel pipes have the characteristics of corrosion resistance and oxidation resistance. In the petrochemical industry, stainless steel pipes are mainly used in pipeline transportation systems, including high-pressure furnace tubes, piping, petroleum cracking tubes, fluid transportation pipes, heat exchange tubes, etc. At the same time, in the equipment manufacturing, oil extraction, refining and other aspects of the petrochemical industry, stainless steel pipes play an important role. Stainless steel is required to perform well in wet and acidic service conditions.

In addition to special material requirements, seamless pipes for ships are required to have a smooth inner and outer surfaces, small errors in outer (inner) diameters, and uniform wall thickness. It has the characteristics of dense metallographic structure, good mechanical properties, good resistance to seawater corrosion, and long service life. The company's factory certifications from classification societies such as American Bureau of Shipping (ABS), Lloyd's Register of Shipping (LR) of the United Kingdom, Germanischer Lloyd (GL), Bureau Veritas (BV) of France, Det Norske Veritas (DNV) of Norway, Registro Italiano Navale (RINA) of Italy, and China Classification Society (CCS), as well as ASME material certification, ADWO material certification, and Russian (GOST) material certification are under review.

For stainless steel pipes for food and medicine, the content of harmful elements they contain must be within a range lower than the national standard. Harmful elements mainly refer to sulfur, phosphorus, lead, hexavalent chromium, etc. Surface treatment is not a means of distinction but only a process. High surface finish on both the inner and outer surfaces results in very little adhesion of media, which is beneficial for corrosion resistance. The higher the surface finish of the inner surface of the pipe, the less liquid medium will be retained, which is conducive to flushing. This is especially true in the pharmaceutical and food industries.

The nuclear power plants under construction and in preparation in China are mainly pressurized water reactor nuclear power plants with very mature technology and safety. In the construction of pressurized water reactor nuclear power plants and the manufacturing of mechanical equipment, the seamless steel pipes used can be divided into four major categories, namely carbon steel/carbon-manganese steel/low alloy steel pipes, chromium-molybdenum steel pipes, stainless steel pipes, and nickel-based alloy pipes. Among them, stainless steel seamless pipes are used in key components such as the main pipelines of the nuclear power plant (coolant), coolant-related primary circuit pipelines, heat transfer tubes of steam generators, and steam drain pipelines.

The braking device of high-speed rail and bullet train is a device used to realize train deceleration or stop running to ensure driving safety. The train braking device is composed of an air supply system and an automatic brake valve installed on the locomotive, brakes and foundation braking devices installed on the locomotive and vehicles respectively, and a brake pipe running through the entire train. Air brake relies on compressed air to push the brake shoe (just understand it as the brake pad) to press against the wheel set or brake disc to achieve the braking purpose. The entire braking system is filled with compressed air. There is no leakage after a pressure test for 15min.

The application of stainless steel pipes in the semiconductor field not only optimizes the performance of production equipment and the cleanliness of the laboratory environment, but also improves the quality and reliability of semiconductor products. Stainless steel polished pipes and BA capillary pipes are widely used in electronics, instrumentation, oxygen transportation and other industries with excellent roughness, dimensional accuracy and cleanliness.

For pipelines with a medium temperature of ≤-20°C on liquefied natural gas (LNG) and offshore drilling platforms, seamless stainless steel pipes for fluid transport (GB/T 14976-2012) and steel butt-welding seamless pipe fittings (GB/T 12459-2005) are adopted. They have relatively high requirements for the low-temperature performance and seawater corrosion resistance of the pipe material.

The seawater desalination methods used include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method, and the current application of reverse osmosis membrane method and distillation method is the mainstream in the market. There are high requirements for the material and anti-corrosion performance of stainless steel and corrosion-resistant alloy seamless pipes.

As a high-end stainless steel material, urea-grade stainless steel pipe has excellent corrosion resistance, high strength, good wear resistance, good processing performance and other characteristics in many fields such as fertilizer, pharmaceutical, food, etc., and at the same time ensures the long service life of the equipment under harsh conditions such as high temperature, high pressure and strong acid. The main grades are S31792 (015Cr18Ni14Mo2), S31053 (015Cr25Ni22Mo2N), 316Mod, 316LUG, S31050, etc. Implement the product standard GB/T37578-2019.

High silicon stainless steel pipes are widely used in concentrated nitric acid and concentrated sulfuric acid resistance, and the typical grades are C4 (0Cr14Ni14Si4), KY704 steel, as well as American standard S32615, S38815, etc.

For the selection of hydrogen materials, due to its high temperature and high pressure working conditions, TP321/H and TP347/H are generally used at home and abroad as the selection of high-pressure hydrogen pipes, due to the addition of stable elements such as Ti and Nb, it has high high temperature corrosion performance and high temperature mechanical properties. Implement the standard GB/T40297-2021.