Temperature nitriding process refers to nitrogen atmosphere at high temperatures and holding a certain time 410 stainless steel pipe, get thick nitrided layer, so ferritic or austenitic stainless steel + surface layer ferritic duplex stainless ultimate transformation To craft nitrogen austenitic stainless organizations. Based on the duplex stainless steel for high temperature nitriding investigated the heating temperature, holding time, nitrogen pressure and other parameters of the high-temperature nitriding process influence law, in order to provide a new way for further in-depth study and application of high nitrogen stainless steel. At a heating temperature not lower than 1200 ℃, holding time is not less than 24h, nitrogen pressure of not less than 0.2MPa under process conditions can be obtained in the stainless steel unilateral thickness about 2.0mm above nitrided layer. For the thickness of the sample in 5.0 canthus n below, can be completely through nitriding, wherein after 1200 ℃ / 0.3MPa thickness / h routing process has a sample 4.2mm full austenitization , with one hundred million oxygen nitrogen analyzer 436 measured an average nitrogen content of 1.0%. Therefore, the use of high-temperature nitriding process to increase the nitrogen content of the stainless steel surface is effective. Short-term surface infiltration by high temperature and pressure of nitrogen, can achieve high performance of high nitrogen stainless steel surface layer, and ferritic stainless steel or duplex stainless austenitic transformation occurs by nitriding, to obtain performance gradient of multiphase composite stainless steel . Super ferrite stainless susceptibility to intergranular corrosion of stainless steel is lower than ordinary ferrite, intergranular corrosion tendency of the size of its C, N content. With a total of C and N content decreased, and appropriately increase carbon sequestration element content, resistance to intergranular corrosion will increase. Also, if the welding process protection ineffective or improper welding process and result in increased weld impurities C, N, O, etc., will also have to intergranular corrosion. Therefore, stainless steel pipe, for super ferrite stainless steel 304 stainless steel pipe, welding should strengthen the protection of critical welds to prevent pollution, but also control of welding materials C and N content is lower than its parent material The content. The main problem exists when welding stainless steel super ferrite is welded joint embrittlement. Since the Cr content is high, low C content, whether at high or at low temperatures is a single ferrite stainless steel pipe 19, heating a strong tendency to grain growth. The steel is typically welded in the annealed state, C and N compounds tissue ferrite and a small amount of C and N in the uniform distribution of a solid solution of trace. When soldering temperature is higher than 950 ℃ and residence time is too long, it will cause the heat-affected zone grain growth and a sharp C, N compounds gathered along the grain boundaries, making the plasticity and toughness of welded joints decrease, this thick tissue can not be heat refinement. Accordingly, a smaller heat input to reduce the residence time at the high temperature zone is to select the basic principles of welding methods and welding parameters. 317l stainless steel tube manufacturers (certified), stainless steel pipe provided by Shandong Jinding Stainless Steel Pipe Co., Ltd. Shandong Jinding Stainless Steel Pipe Co., Ltd. (www.ss304L.com) (www.ss304L.com) is Dezhou, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinding tube industry leader in the staff warmly welcome all inquiries negotiations to create Jinding Pipe a better future. You can also access (www.ss304L.com/supply_details_48122610.html), for more information about the company.