Stainless steel pipe fittings processing steel metal stainless steel pipe fittings In order to meet different uses and conditions, the layout of ribbed pipe fittings is varied. Among them, elbows, tees and reducers are the most widely used. The commonly used continuous methods of stainless steel pipe fittings include butt welding continuous, socket welding continuous and pipe rib continuous. Generally, DN50 and above pipes use butt-welded continuous stainless steel pipe fittings, and pipes below DN50 use socket welded stainless steel pipe fittings or ribbed continuous pipe fittings plus sealed welded pipe fittings.
The processing of stainless steel pipe fittings should first be based on the planned pressure and temperature of the stainless steel pipe system and the nature of the medium in the pipe. Secondly, consider the general composition of economy and life. Forging the pipe fittings and according to the planned pressure and temperature of the stainless steel pipe system. Determine the applied pressure-temperature level of the pipe fittings.
When the branch pipe fitting is used to lead the branch pipe from the main pipe, if the pipe diameters are similar, the tee connection should be used for continuation; when the diameter of the branch pipe is less than or equal to DN50, when the diameter of the tee is not limited or applicable, the branch pipe stand, stainless steel should be used. Branch pipe continuous pipe fittings such as pipe fitting half pipe discussion or reinforced pipe discussion; in addition, according to the detailed environment of the project, the layout of simply welded branch pipes on the main pipe can also be adopted, but it is necessary to check whether the stainless steel pipe fittings continue to require reinforcement.
The electrode should be kept dry during application. The titanium calcium type should be dried at 150°C for 1 hour, and the low hydrogen type should be dried at 200-250°C for 1 hour. Do not repeat the drying, otherwise the coating will easily crack and peel to prevent the coating of the electrode from sticking. Oil and other dirt, to avoid increasing the carbon content of the weld and affecting the quality of the weldment. The weldability of stainless steel flanges is poor, so attention should be paid to the welding process, heat treatment prerequisites and the selection of suitable welding rods.
Chromium stainless steel pipe fittings are stronger after welding and are prone to cracks. If the same type of chromium stainless steel electrode is used for welding, preheating above 300°C and slow cooling at 700°C after welding must be carried out. If the weldment cannot be subjected to post-weld heat treatment, stainless steel flange pipe welding rods should be used.
When stainless steel pipe fittings are welded, carbides are precipitated after repeated heating, which reduces corrosion resistance and mechanical performance.
