P9 Seamless Steel Pipe Factory Pickling Passivation Steps

In P9 Seamless Steel Pipe Factory the water-washed pipe is rinsed with pressurized water (pressure P ≥ 0.1 MPa). The operation steps of pickling and passivation of stainless steel pipe are divided into the following points:

When the pipe fitting is soaked in the tank, pay attention to the position of the pipe to avoid air in the P9 Seamless Steel Pipe. After the passivated pipe is passivated, it shall be self-inspected and mutually inspected, and then submitted to the quality inspector for acceptance. During the soaking process, the pipe fittings should be moved up and down or back and forth, so that the inner cavity solution is continuously replaced to improve the effect. Remove the fittings as necessary, rinse with water and then soak. The chemical degreasing adopts the in-tank immersion method, the degreasing tank is made of steel plate, and the inner wall is covered with PVC or polyethylene. If the outer surface needs to be painted, it will be carried out according to the coating requirements. The test uses 12~15% nitric acid (by volume) for chemical degreasing treatment, the temperature is 40 °C ~ 60 °C, Tianjin 310S stainless steel tube, the time is 2 ~ 4 hours. When immersing in the tank, pay attention to the position of the tank to avoid air in the tube. The hot water tank is made of steel plate and the inner wall is covered with PVC or polyethylene.