Accounting for about % - % of the total steel, it is widely used in the national economy. Because the steel pipe has a hollow section, it is suitable for gas and solid transmission pipelines; at the same time, compared with the round steel of the same weight, the steel pipe has large section coefficient and high flexural and torsional strength, the structure and components formed by pipe have a larger section modulus than solid parts. Therefore, stainless steel pipe itself is an economic section steel that saves metal. It is an important part of steel, especially in oil drilling, production and metallurgyBecause stainless steel has many ideal properties required by building materials, it can be said to be unique in metals, and new stainless steel is being developed to meet the strict requirements of advanced architectural applications. Due to the continuous improvement of production efficiency and quality existing types have been improved, stainless steel has become one of the cost-effective materials selected by architects. Stainless steel integrates performance, appearance and use characteristics,Ohrid AirportStainless steel 304 corrugated hose, so stainless steel will still be one of the best building materials in the world.Ohrid Airport,D cold rolled, heat treated, pickled or similar matt surface.Measures to improve the welding quality of stainless steel pipe in order to ensure that the outer surface of stainless steel pipe is not damaged and purified, the maintenance of stainless steel pipe should be strengthened in each process of consumption, mainly including the following three aspects: the processing and consumption of stainless steel pipe should have a special consumption workshop (wood board is well used) , avoid the machining platform of austenitic stainless steel and carbon steel or solid overhead.Kabinda,Ferritic and martensitic stainless steels are represented by series numbers. Ferritic stainless steel is marked with and martensitic stainless steel is marked with and C, dual phase (austenite ferrite).All steel with openings at both ends and hollow sections, and with a large ratio of length to section perimeter, can be called steel pipe. When the ratio of length to section perimeter is small, it can be called pipe section or tubular fittings, which belong to the category of pipe products.Model & mdash; Commonly used precipitation hardening stainless steel model,%Ni.

Decorative stainless steel pipe: usually the outer wall is relatively bright, so its name is considered. Decorative stainless steel pipe is used for decorative purposes. The stainless steel pipe for general decorative purposes is relatively thin. Because it is different from the manufacturing process of stainless steel product pipe, the price also varies greatly. The general production process of decorative stainless steel pipe is ordinary welded stainless steel pipe. Guangdong stainless steel product pipe stainless steel product pipe: generally, the surface of stainless steel product pipe is also a bright surface, and a small number of pipes with acid pickling industrial surface. As mentioned above, stainless steel product pipe belongs to the purpose of stainless steel products, because the outer diameter size, mechanical properties, acid, alkali and corrosion resistance of stainless steel pipe are relatively good, Therefore, stainless steel pipes are generally used as anti-corrosion materials or hardware products in large-scale production enterprises. The production process of stainless steel pipes is one-time forming, and nitrogen protection is also added during welding.The national standard thickness of stainless steel pipe mainly depends on the thickness of raw materials and processing technology. The thickness of welded pipe is basically the same as that of raw materials. For seamless pipe, it is slightly thinner than that of raw materials. At present, the stainless steel pipe industry is dominated by large negative difference, mainly for the consideration of cost saving thickness. It provides all kinds of stainless steel plates, stainless steel coils, stainless steel belts, stainless steel pipes for individuals and enterprises all over the country for a long time, on-site settlement and honest operation. There are offices all over the country for long-term cooperation. Generally, there will be . ~ .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.Range,The bright nickel layer on the stainless steel pipe is a silver white metal with slight yellow light. Its hardness is higher than that of copper, zinc, tin, cadmium, gold and silver, but lower than that of chromium and rhodium. Bright nickel has high chemical stability in air and good stability to alkali. Using Brightener on stainless steel pipe, bright nickel can be directly plated without polishing, so as to improve the hardness, wear resistance and leveling of the surface, make the appearance of stainless steel pipe consistent with other nickel plated parts, and avoid the corrosion of potential difference between stainless steel pipe and other bright nickel. After using bright nickel solution for a period of time, due to the of brightenerAustenitic stainless steel heat treatment austenitic stainless steel commonly used heat treatment processes are: solution treatment, stabilization treatment and stress relief treatment.The selection of pipes and fittings for welding data preparation shall be based on the quality elements of the application environment,Ohrid AirportSUS304 stainless steel pipe, chemical composition and application pressure, and the commodities of corresponding grades shall be selected to ensure the weld metal structure and machine function.

The back is not protected by argon, and good economic benefits have been obtained.Quality AssuranceRefining and transportation industries are in great demand. Secondly, geological drilling chemical industry, construction industry, machinery industry, aircraft and automobile manufacturing, boiler, medical equipment, furniture and bicycle manufacturing also need a large number of various steel pipes. With the development of new technologies such as atomic energy, rocket, missile and aerospace industry, stainless steel pipe plays an increasingly important role in national defense industry, science and technology and economic construction.According to different metallographic structure of stainless steel it is divided into semi Ferritic and semi martensitic stainless steel pipe, austenitic ferritic stainless steel pipe, etc.At low temperature, ferritic stainless steel pipe has low-temperature brittleness like carbon steel, but austenitic steel does not. Therefore, ferritic or martensitic stainless steel produces low-temperature brittleness, while austenitic stainless steel or nickel base alloy does not show low-temperature brittleness. Sus (Cr) and SUS (cr) of ferritic stainless steel pipe It shows that the impact value decreases sharply at low temperature. Therefore, it is necessary to pay special attention when using at low temperature. As a way to improve the impact toughness of ferritic series stainless steel, high purification process can be considered. With the help of C and N level, the embrittlement temperature is in the range of - ℃ to - ℃Ohrid Airport,Some reasons for product composition ratio: in order to reduce the production cost, reduce the proportion content of some important elements such as chromium and nickel,Ohrid Airport304 stainless steel industrial welded pipe, and increase the content of other elements such as carbon. This production phenomenon that the composition ratio is not strictly in accordance with the product model and product characteristics not only greatly reduces the product quality, for example, when the chromium content of stainless steel pipe is insufficient, it not only affects the production The corrosion resistance and formability of products have potential product quality and safety hazards when they are used in chemical, equipment and production industries. At the same time, they also affect the appearance and oxidation resistance of products.The main control load of the platform has high requirements for the shear bearing capacity of the guide leg of the 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, 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, the smaller the shear strength. Combined with the test, the empirical formula of shear capacity of concrete-filled steel tubular in pipe is proposed, 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. Based on the jacket offshore platform, it is proposed to replace the four hollow steel conduit legs of the original offshore platform with concrete-filled steel tube in stainless steel tube to form a new composite offshore platform with concrete-filled steel tube in stainless steel tube, so as to improve the ice resistance and disaster prevention ability of the offshore platform. The scale test on the offshore platform shows that the composite offshore platform of concrete filled steel tubular in stainless steel pipe (hereinafter referred to as the composite offshore platform) has better anti icing performance than the ordinary jacket offshore platform. Taking push as an example, the peak acceleration and displacement of the upper deck of the composite offshore platform of concrete filled steel tubular in stainless steel pipe are reduced by % and % respectively. The analysis of ABAQUS finite element and experimental simulation results shows that the error of the two results can be basically within %. Through the simulation analysis of the ultimate bearing capacity of the stainless steel tube in tube concrete-filled steel tubular composite platform and the original offshore platform, it can be seen that the stainless steel tube in tube concrete-filled steel tubular composite platform has stronger ultimate bearing capacity. Therefore, longitudinal strain and circumferential strain of the short columns under axial compression were measured. The effects of steel tube wall thickness and concrete strength on the bearing performance of the short columns were investigated. Reference was made to the European Code for design of concrete filled steel tubes (Eurocode), American code (ACI -) and Japanese code (aij-cft), China's relevant regulations D --dlt- and CECS calculate the preparation of stainless steel pipe construction, prepare construction scheme and construction schedule scheme, and establish quality standards.Model & mdash; General model; stainless steel. The GB brand is CrNi.