How to enhance the service life and corrosion resistance of stainless steel water pipes

From the production process to storage, shipment, and transportation of stainless steel pipes, although they are protected by packaging bags, collisions are inevitable and scratches may occur. So, what should be done when scratches appear? Will it cause rusting and affect the service life? How should we deal with it? After the stainless steel pipe is scratched, the protective layer on the surface is damaged. The damaged area combines with air and undergoes oxidation. Over time, corrosion will occur, affecting the service life of the stainless steel pipe. So, how can we improve the service life and anti-corrosion ability of the stainless steel pipe? 

1. The first case is that the sheet material was already scratched before processing; it was just not obvious. In this case, it is necessary to determine the severity of the scratch. If the area and depth of the scratch have exceeded the customer's acceptable range for the final product, then the sheet should be replaced to meet the requirements of the steel pipe. That is to say, the gate of the processing operator is very important. 

2. The second case is that the stainless steel mirror panel material has already undergone mirror processing, but during the film application process, it was accidentally scratched. There are various types of scratches, such as point-like scratches, linear scratches, and large-area scratches. Point-like scratches, regardless of their depth, can be effectively addressed by using argon arc welding for repair, followed by grinding with a grinding machine. After grinding, it needs to go through a mirror polishing equipment process for two or more times. The basic information can effectively solve this problem. 

If the repair is carried out on a shiny surface, the polishing method can be used, with different grit polishing wheels being repeatedly polished. While for general repair on a matte surface, the sandblasting method is adopted, which requires special equipment. If the surface was previously treated with a brushed finish, professional equipment is also needed for processing. Regardless of which method is used, the surface must be treated with passivation at the end. If it is judged to be a minor scratch, for a mirror surface, the polishing wax can be used to polish the stainless steel surface, and for a brushed surface, the brushing machine can be used to brush the stainless steel surface. 

Then there are linear scratches, which we call scratches. Scratches are more difficult to deal with. For shallow scratches, the above methods (reducing the feed roller speed and lowering the grinding head) can solve the problem. For deep scratches, they are not easy to handle. Additionally, when it comes to large-area scratches and scratches on stainless steel mirror surfaces, there are also two different levels of depth. The handling methods are the same as above. 

If it is the second type of scratch, it becomes more challenging. Because this secondary scratch should be avoided at all costs. It is recommended that everyone take the following measures to reduce or prevent the possibility of scratch on the mirror panel: apply a protective film on the surface of the board, pack the board with wooden frames, place paper or plastic boards between the board and the top/bottom, pack the entire board with waterproof paper, and clearly indicate on the board surface or packaging surface such words as "Protect the board surface and do not scratch it". 

Regularly remove rust from the stainless steel pipes. One of the signs of surface damage is that the welder creates an arc on the surface, which causes the protective film on the surface to be damaged, leaving potential corrosive materials on it, thus leading to corrosion. In such cases, the corroded stainless steel pipes can be mechanically cleaned (by polishing and grinding the weld points) or repaired for welding defects after welding. Additionally, the rough surface of the stainless steel pipes needs to be repaired or re-welded. 

This is all the information you need regarding how to deal with scratches on the surface of 316 stainless steel pipes. The scratched parts can be cleaned to prevent residues or process lubricants from remaining inside the scratches and corroding the surface of the stainless steel pipes.