1. Structural stainless steel tubes (GB/T14975-1994) are hot-rolled stainless steels that are widely used in corrosion-resistant pipes and structural parts and components in the chemical, petroleum, textile, medical, food, and machinery industries. Expanded) and cold drawn (rolled) seamless steel tubes.
2. Stainless Steel Pipe for Fluid Transportation (GB/T14976-1994) is a hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluids.
3. Analysis of cracks in stainless steel tubes: Longitudinal samples of cracked tubes near the welds were taken to determine the chemical composition, mechanical properties and metallographic structure, and the cracks were observed. The results show that the cu content in the TP304H stainless steel tube is high. Cracks in the middle of the pipe wall thickness are caused by the stainless steel pipe manufacturer during the production process. Cracks near the weld are due to welding.
4, stainless steel tube product application:
The development of the petrochemical industry also has a large demand for stainless steel tubes. The number of stainless steel tubes required for overhauling and replacing a polyene phenol plant is 99.1 tons, of which Φ108-630mm large-diameter stainless steel seamless tubes account for 53.79%. According to calculations, only the Sino-US joint venture BUICK sedans and Shanghai Volkswagen's Santana B5 limousines consume 560 tons of stainless steel pipes annually. The aerospace industry requires 200 tons of precision stainless steel pipes and high-temperature full-gold pipes. Electronic, instrumentation, metallurgical and other industries require about 5,000 tons of stainless steel pipes each year. The light industry and medical and pharmaceutical industries such as beverages, alcohol, food, textiles, printing and dyeing are used for equipment manufacturing and maintenance, etc. The annual consumption of stainless steel pipes is more than 20,000 tons. Stainless steel pipelines and their water delivery equipment are the most advanced basic water purification materials in the world today, and some cities have also begun to use stainless steel pipes for the transportation of fluids such as water and gas. Wuhan invested heavily in the use of stainless steel pipelines and equipment, renovated the main water purification pipelines and water collecting tanks of 13 water plants, and will also build new high-rise residential buildings and office buildings in the shortest time possible. Stainless steel pipe water supply. Water supply pipelines for some residents in Ningbo and Daqing have also started to use stainless steel pipelines. The future civilian sector will be a huge market for stainless steel pipes.
5, stainless steel pipe installation knowledge: Stainless steel pipe installation knowledge, including the installation of stainless steel pipe and carbon steel is basically the same, in some processes have the following process requirements: 1) stainless steel lifting, can not be directly with other metals In contact, non-metallic materials such as wood or rubber sheets should be added. 2) Pipe cutting is not allowed to use ordinary grinding wheel cutting, stainless steel special grinding wheel or plasma cutting should be used. 3) During the tack welding of stainless steel pipes and fittings, the inside of the weld should be protected by argon. 4) Arcing, arc closing and arc starting shall be carried out by reflow method. The arc shall be filled with arc pits. The arc must be completed within the groove, and arcing and arcing on the surface of the base material of the pipe and pipe are prohibited. If defects such as air holes and cracks are found at the start of arcing and arcing, they should be disposed of in a timely manner. 5) Stainless steel pipes, fittings and stainless steel pipes, fittings and non-stainless steel.
6, the advantages and disadvantages of stainless steel tube heat exchanger and copper tube heat exchanger: The biggest difference is not the heat transfer performance, corrosion resistance, but the copper tube is less easy than the stainless steel tube scaling; Second, only It is heat transfer performance. The thermal conductivity of copper is higher than that of stainless steel, so the heat transfer coefficient of copper tubes of the same shape is higher than that of stainless steel tubes. Third, the strength of stainless steel is higher than that of copper, so now we have seen that the plates of the plate heat exchanger are all stainless steel (of course not other, such as titanium plate, graphite), but the original plate is also copper Of course, the price of copper is much higher than stainless steel.
2. Stainless Steel Pipe for Fluid Transportation (GB/T14976-1994) is a hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluids.
3. Analysis of cracks in stainless steel tubes: Longitudinal samples of cracked tubes near the welds were taken to determine the chemical composition, mechanical properties and metallographic structure, and the cracks were observed. The results show that the cu content in the TP304H stainless steel tube is high. Cracks in the middle of the pipe wall thickness are caused by the stainless steel pipe manufacturer during the production process. Cracks near the weld are due to welding.
4, stainless steel tube product application:
The development of the petrochemical industry also has a large demand for stainless steel tubes. The number of stainless steel tubes required for overhauling and replacing a polyene phenol plant is 99.1 tons, of which Φ108-630mm large-diameter stainless steel seamless tubes account for 53.79%. According to calculations, only the Sino-US joint venture BUICK sedans and Shanghai Volkswagen's Santana B5 limousines consume 560 tons of stainless steel pipes annually. The aerospace industry requires 200 tons of precision stainless steel pipes and high-temperature full-gold pipes. Electronic, instrumentation, metallurgical and other industries require about 5,000 tons of stainless steel pipes each year. The light industry and medical and pharmaceutical industries such as beverages, alcohol, food, textiles, printing and dyeing are used for equipment manufacturing and maintenance, etc. The annual consumption of stainless steel pipes is more than 20,000 tons. Stainless steel pipelines and their water delivery equipment are the most advanced basic water purification materials in the world today, and some cities have also begun to use stainless steel pipes for the transportation of fluids such as water and gas. Wuhan invested heavily in the use of stainless steel pipelines and equipment, renovated the main water purification pipelines and water collecting tanks of 13 water plants, and will also build new high-rise residential buildings and office buildings in the shortest time possible. Stainless steel pipe water supply. Water supply pipelines for some residents in Ningbo and Daqing have also started to use stainless steel pipelines. The future civilian sector will be a huge market for stainless steel pipes.
5, stainless steel pipe installation knowledge: Stainless steel pipe installation knowledge, including the installation of stainless steel pipe and carbon steel is basically the same, in some processes have the following process requirements: 1) stainless steel lifting, can not be directly with other metals In contact, non-metallic materials such as wood or rubber sheets should be added. 2) Pipe cutting is not allowed to use ordinary grinding wheel cutting, stainless steel special grinding wheel or plasma cutting should be used. 3) During the tack welding of stainless steel pipes and fittings, the inside of the weld should be protected by argon. 4) Arcing, arc closing and arc starting shall be carried out by reflow method. The arc shall be filled with arc pits. The arc must be completed within the groove, and arcing and arcing on the surface of the base material of the pipe and pipe are prohibited. If defects such as air holes and cracks are found at the start of arcing and arcing, they should be disposed of in a timely manner. 5) Stainless steel pipes, fittings and stainless steel pipes, fittings and non-stainless steel.
6, the advantages and disadvantages of stainless steel tube heat exchanger and copper tube heat exchanger: The biggest difference is not the heat transfer performance, corrosion resistance, but the copper tube is less easy than the stainless steel tube scaling; Second, only It is heat transfer performance. The thermal conductivity of copper is higher than that of stainless steel, so the heat transfer coefficient of copper tubes of the same shape is higher than that of stainless steel tubes. Third, the strength of stainless steel is higher than that of copper, so now we have seen that the plates of the plate heat exchanger are all stainless steel (of course not other, such as titanium plate, graphite), but the original plate is also copper Of course, the price of copper is much higher than stainless steel.
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