superheater and reheater are the parts with high working temperature and bad working environment. Previously

Application field: tubular boiler for pipeline in harsh seabed environment product description: ultra (ultra) critical unit is the basis of modernization of power generation equipment and energy conservation and emission reduction. Among the important pressure parts of ultra (supercritical) boiler, all such materials used in China were imported from abroad, while only steel material manufacturers in the world have limited capacity. Such materials have a large gap, expensive import prices, difficult procurement and short supply, which seriously affected the production of ultra supercritical boilers and the development of electric energy in China. At present, China's demand for utility boiler tubes is about tons, and with the continuous improvement of ultra (supercritical) power generation technology, the demand is expanding. Several large domestic enterprises have invested a lot of human and financial resources in the R & D and production of such products, and have made considerable achievements. On the one hand it has made its own contribution to the development of national electric power industry, but also brought considerable economic benefits to enterprises.The bearing capacity of decorative stainless steel pipe ice load is the main control load of offshore platform in severe cold area which has high requirements for the shear bearing capacity of jacket leg of offshore platform. In order to study the factors affecting the shear capacity of the jacket legs of the stainless steel pipe in pipe concrete-filled steel tubular offshore platform, a total of concrete-filled steel tubular shear members were fabricated to study the effects of outer steel pipe material, concrete strength, void ratio and shear span ratio on the shear capacity of concrete-filled steel tubular in pipe. It is found that the shear strength of members increases with the decrease of void ratio and the increase of concrete strength; The larger the shear span ratio, which is analyzed and verified by ABAQUS finite element modeling software. The results show that the simulation is in good agreement with the test results. In order to study the axial compression performance of stainless steel tube concrete conduit leg and the axial compression performance of stainless steel concrete conduit leg, experiments are used to verify the correctness of the finite element model. The load displacement curves of specimens in groups were compared, and the effects of different void ratio, concrete strength, diameter thickness ratio and bone index on the axial compression performance of concrete-filled stainless steel tubular short columns under axial compression were analyzed. The results show that with the increase of concrete strength, the bearing capacity of specimens increases, but the ductility of specimens decreases; With the increase of void ratio and diameter thickness ratio, the bearing capacity of the specimen decreases; The bearing capacity of stainless steel tube concrete can be effectively improved by adding steel bone; Increasing the bone matching index of steel bone can improve the bearing capacity of the specimen. A compound forming process of double-layer stainless steel pipe for primary circuit main pipeline of station is designed, which solves the problem of limited length of finished products in traditional forging or casting process, and meets the special requirements of complex working environment on pipeline performance. The three roll cross rolling forming process of double-layer casing with outer layer -n austenitic heat-resistant stainless steel and inner layer cr-ni martensitic heat-resistant stainless steel was simulated and optimized by using DEFORM-D finite element simulation software. The internal and external deformation, stress-strain field and temperature field of double-layer stainless steel pipe were analyzed, and the optimal deformation parameter combination was obtained by orthogonal test. The simulation results show that in the process of three roll cross rolling, the large values of equivalent stress, equivalent strain and temperature are concentrated in the area between the outer tube and the roll, so as to obtain the forged joint with better mechanical properties. According to the connection mode of the original pipe system and the plastic forming characteristics of steel pipe and accurately shape the end of the stainless steel pipe, a multi-step upsetting and extrusion process for the end of stainless steel pipe is proposed. The process is numerically simulated by DEFORM-D three-dimensional finite element simulation software, and the forging forming process is analyzedVeliko Turnovo,Cold rolled steel strip shall be delivered in the state of heat treatment (annealing, normalizing and tempering after normalizing), and shall be delivered smoothly.Stainless steel pipe is durable and has been recognized by the engineering community, and relevant parties are starting from reducing the wall thickness and lowering the grid, so as to facilitate further development. In particular, the price of stainless steel pipe is not high, so the supporting connection, the reliability and price of pipe fittings are the main factors determining its development. Domestic developers have independently developed connection technology and pipe fittings in Sichuan, Guangdong, Zhejiang, Jiangsu and other places, which is a promising pipe. The Ministry of construction and relevant departments also attach great importance to this new type of pipe. According to China technology market management promotion center and gksz [] No. document on Application & ldquo; High diameter to wall ratio and high precision stainless steel medium and high pressure water supply pipes and supporting fittings and special technology & rdquo; It is learned from the notice that the application of stainless steel pipe technology and product is of great significance to improve the grade of modern buildings in China and improve and ensure the water quality of water supply.Perai,During welding, the process of ventilation in advance and gas stop behind shall be adopted, and the adhesive cloth on the outside shall be torn off while welding. Because the blocking plate is composed of rubber and white iron sheet, it is not easy to be damaged, so this welding can well ensure that the inner side of the weld is filled with argon and its purity so as to effectively ensure that the metal on the inner side of the weld is not oxidized and ensure the quality of weld backing welding.Typical ferritic stainless steels are Crl, Cr and Cr.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, 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, 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.

Model & mdash; Martensite (high strength chromium steel), good wear resistance and poor corrosion resistance.With the development of social economy, the application of stainless steel pipe has been more and more popular. It will bring new changes in various fields.There are three main reasons for oxidation of stainless steel: production process, which is one of the reasons for oxidation of steel products. In terms of production process and product characteristics, forming a thin oxide film on the product surface is the basic process to avoid oxidation and it is also one of the main characteristics of steel products different from other steel products. It is specialized in products, renewable resources business and business package Including: stainless steel plate, stainless steel coil,Veliko TurnovoStainless steel binding tape, stainless steel belt and stainless steel pipe. However, when the oxide film is incomplete and discontinuous due to insufficient or negligent production process, the oxygen in the air will directly react with some elements in the product,Veliko Turnovo2520 stainless steel pipe, resulting in the appearance of oxidation of the product.Welcome calls ,The recrystallization temperature changes with the shape variable. When the shape variable is %, the recrystallization temperature drops to ℃, and the recrystallization annealing temperature of cold deformed austenitic stainless steel is ~ ℃. At ℃, it needs to be kept warm for h, fully burned at ℃, and then water-cooled.Model & mdash; The corrosion resistance is the same, and the strength is better because the carbon content is relatively high.In the building water supply pipe system, due to the end of the glorious history of galvanized steel pipe, various new plastic pipes and composite pipes have developed rapidly, but various pipes still have some deficiencies in varying degrees, which are far from fully meeting the needs of water supply pipe system and the national requirements for drinking water and related water quality. Therefore, relevant experts: building water supply pipes will eventually return to the era of metal pipes. According to foreign application experience, stainless steel pipe is recognized as one of the pipes with good comprehensive performance in metal pipe.

In the building water supply pipe system, due to the end of the glorious history of galvanized steel pipe, various new plastic pipes and composite pipes have developed rapidly, but various pipes still have some deficiencies in varying degrees, which are far from fully meeting the needs of water supply pipe system and the national requirements for drinking water and related water quality. Therefore, relevant experts: building water supply pipes will eventually return to the era of metal pipes. According to foreign application experience, stainless steel pipe is recognized as one of the pipes with good comprehensive performance in metal pipe.Excellent quality, including the chemical fertilizer industry, has a great demand for stainless steel pipes. Stainless steel pipes are mainly used in this industry, including, , l, etc.,Veliko TurnovoStainless steel heat exchanger tube, with an outer diameter of about ￠ - ￠ and a wall thickness of about mm-mm (generally medium and low pressure transmission pipes with a specification of more than & phi; mm). The specific application fields are: furnace pipes, material transmission pipes, heat exchanger pipes, which is widely used in industrial transmission pipelines such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and mechanical structural parts. In addition, when the bending and torsional strength are the same, the weight is relatively light. It provides L stainless steel pipe, s stainless steel pipe and L stainless steel pipe for a long time. It is an old brand of with advantages in price and guaranteed quality It is also widely used in manufacturing mechanical parts and engineering structures. It is also commonly used as furniture, kitchenware, etc.Veliko Turnovo,Austenitic stainless steel is generally used for manufacturing and manufacturing chemical equipment components, low-temperature equipment components in refrigeration industry, and can be used as stainless steel spring and clock spring after deformation strengthening.Human factors are also one of the causes of product oxidation that some consumers often encounter when using stainless steel products. Some consumers operate improperly in product use and maintenance, especially some stainless steel pipe products used in food and chemical equipment industry. For the artificially generated oxidation of steel products, they should have correct product use knowledge and Reasonable and effective maintenance shall be carried out regularly to reduce oxidation caused by improper use.Austenitic stainless steel heat treatment austenitic stainless steel commonly used heat treatment processes are: solution treatment, stabilization treatment and stress relief treatment.