How to produce high quality stainless steel pipes?

by:Caiyi     2019-12-26
How to produce high quality stainless steel pipes? Stainless steel pipe manufacturers should consider the production cost of stainless steel pipes, and should also consider the factors of preventing corrosion and improving product quality. Therefore, it is very necessary to adopt a solid solution process in the production process of stainless steel pipes to enhance the safety of pipes, heat treatment process plays a vital role in the quality and safety of pipes. It is understood that a few manufacturers have not adopted solid solution treatment in order to save costs in the production of pipes, but only used polishing, sandblasting and other methods to cover up the defects and deficiencies of pipes, this will bring permanent hidden dangers to the use of pipes. Austenitic stainless steel is softened by heat treatment, and the stainless steel is heated to 950 ~ At about 1150 ℃, the carbide and various alloy elements are uniformly dissolved in austenite for a certain period of time, which is called solid solution treatment. The heat treatment of stainless steel pipe, stainless steel pipe after forming, welding and other processes, metal molecular structure, magnetic and physical properties have changed. Through the atmosphere protection solid solution process, the corrosion resistance affected after processing can be restored, and the required hardness of stainless steel can be obtained at the same time, thus ensuring the best service performance of stainless steel. The stainless steel pipe after Solution treatment has good improvement effect: 1. Eliminate the modification phenomenon of stainless steel pipe during processing, and reduce the hardness of stainless steel to below 220HV, the plasticity and toughness of stainless steel are improved, making the pipe more convenient and safe in installation. 2. Restore the stress and intergranular changes in the production process of stainless steel pipes, reduce intergranular corrosion and stress corrosion of stainless steel, and enhance corrosion prevention capability. 3. Remove the magnetic properties of stainless steel due to the processing process and stabilize the austenite structure. 4. Restore the natural light on the surface of the stainless steel material (Natural light is different from polished light). Stainless steel pipe solid solution characteristics, stainless steel is a special steel, due to the existence of nickel, chromium and other alloying elements, its heat treatment and ordinary steel heat treatment have different characteristics: 1. The thermal conductivity of stainless steel is relatively low. At normal temperature, the thermal conductivity is only 27% of that of carbon steel. With the increase of heating temperature, the difference in thermal conductivity of stainless steel gradually decreases. Therefore, when stainless steel is heated at low temperature, the heating process should be carried out slowly. 2. Austenitic stainless steel can inhibit the generation of carbides after being heated to about 1100 ℃ through solid solution, and then rapidly cool to room temperature to make carbon reach supersaturated state, which can greatly improve the corrosion resistance of stainless steel. 3. The pipe is used in the solid solution process (Hydrogen) Gas protection to avoid the formation of viscous iron oxide on the stainless steel surface, restore the brightness of the stainless steel surface, and improve the reputation of the appearance. Three elements of solid solution for stainless steel pipes the advantages and disadvantages of solid solution process for stainless steel pipes have great influence on the corrosion resistance and appearance brightness of stainless steel, and also play a decisive role in the processability of stainless steel. Therefore, the heat treatment process of stainless steel plays a very important role in the production of stainless steel pipes. 1. Solid solution temperature. According to the characteristics of the chemical composition of stainless steel, the solution temperature of stainless steel should be 950- Only at 1150 degrees Celsius can the softening effect be achieved, and the hardness of stainless steel can be reduced to less than 220HV to meet the quality requirements for pipe installation and clamping. If the temperature control is unreasonable, various quality defects are easy to occur. 2. Solid solution time. During the heating process of austenitic stainless steel, the residual ferrite content in the steel decreases with the extension of heating time. Therefore, the solid solution treatment of stainless steel pipes should be controlled at about 1050 ℃ to make carbon saturated and improve corrosion resistance. Then quickly cool in the air to achieve a solid solution effect. 3. Solid solution speed and heat preservation. The thermal conductivity of stainless steel is relatively low, and the thermal conductivity is only 27% of that of carbon steel at normal temperature. Therefore, the heating process of stainless steel at low temperature should be carried out slowly. If the heating speed is too fast, deformation is easy to occur. In solid solution, the heating speed of stainless steel should be controlled and the holding time should be paid attention. For example, if 316L steel is kept at about 1100 ℃ for a long time, the content of residual ferrite will decrease continuously. In the solid solution production of Shenzhen Mingcheng metal, the solid solution of stainless steel pipe must be heated--Insulation-- The process of time cooling takes about 40 minutes.
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