Points for attention in processing of stainless steel tee

　　The passivation process of stainless steel tee can be divided into many types, including wet process and dry process. The iron oxide formed on the common carbon steel continues to oxidize, which makes the corrosion expand continuously and finally forms holes. Carbon steel surfaces can be guaranteed by electroplating with paint or oxidation-resistant metals (e.g., zinc, nickel, and chromium), but as is known, this protection is only a thin film. If the protective layer is damaged, the steel below will start to rust.

　　The passivation effect of stainless steel tee depends not only on the passivation process, but also on the stainless steel stamping elbow material itself. The specific influencing factors are the elements contained in the stainless steel stamping elbow, the metallographic structure of stainless steel, the processing state of stainless steel, etc. Among the components, chromium and nickel belong to the elements with strong passivation, followed by iron. Therefore, the higher the content of chromium and nickel, the stronger the passivation of stainless steel.

　　The corrosion resistance of Sch40 4 Inch Stainless Steel Pipe Fitting Tee depends on the alloy elements contained in the steel. Chromium is the basic element to obtain corrosion resistance of stainless steel tee. When the content of chromium in steel reaches about 1.2%, chromium will react with oxygen in the corrosive medium to form a very thin oxide film (self passivation film) on the steel surface, which can prevent further corrosion of the steel matrix. Stainless steel tee has different production processes and processes. It needs to be produced and processed according to certain conditions in the processing. Some matters need to be paid attention to in the processing of tee pipe fittings of different properties.

　　1. The workpiece shall be corrected by static load, and it is generally not suitable for local knocking.

　　2. After correction, stress relief annealing shall be carried out below the original tempering temperature.

　　3. Stress relief treatment shall be carried out for austenitic stainless steel tee work piece under 300C after correction.