Analysis of Corrosion and Leakage of Stainless Steel Pipe

Stainless steel pipe is a hollow, long, round and simple steel. Because of its relatively good mechanical properties, corrosion resistance, and economic performance, it has been widely used in many industries. However, stainless steel pipes still have the problem of rot-drink leakage. Caiaruo stainless steel pipes are normally used. Therefore, we need to conduct a careful analysis of the reasons for the circumstance and leakage of mixing to solve the problem of the paint depth of stainless steel pipes. 1 Analysis of the characteristics of stainless steel materials

1.1 Material characteristics Stainless steel is called stainless steel, which has very good kinetic corrosion performance. The average annual corrosion rate in the atmosphere is 001mm. The main alloy elements in stainless steel are chromium and nickel. Adding ≥12% molecular weight chromium, the steel will have corrosion resistance. The material used for the condenser heat exchange tube is generally 00 CriNine

(It is commonly referred to as 304L). It is an ultra-low carbon stainless steel. Among them, the content of Cr is about 18%, and the content of Ni is about 10. It is also the most demanding stainless steel variety in the first industry. There is an oxide film on the surface of stainless steel, called a passivation film, which isolates the gold element in the material from the oxygen in the air, and plays a role in preventing corrosion.

12 Processing characteristics The performance of stainless steel pipes is not only related to the material itself, but also closely related to its addition method. The production process of seamless pipes is cold drawn with qualified bad materials, and then subjected to hopper melting treatment (ie high temperature tempering + quenching). Then put it in an acid environment, pickling passivation. Make it a layer passivation film. The whole process is the same as the stainless steel plate. The mountain is small in size and easy to bury. Its mechanical properties are better than that of sheet metal. And its processing technology determines its thickness is thicker than welded pipe. Welded pipe is made of cold rolled steel strip

(Diameter flash melting treatment) After the die is extruded into a steel shape, it is then welded into a battle shape by automatic argon scoop welding and white melting, and after straightening, it is tempered with low temperature stress relief. Finally, pickling is carried out. The thickness of the steel strip produced by Shanyu Niu can be controlled to be relatively thin, and the cost of production is also lower. Therefore, the price of welded pipe is relatively suitable for local mechanical inspection performance and chemical composition analysis. The performance is not significantly different from that of seamless pipe, but the weld of welded pipe is a thin link, which is not reflected in mechanics, but in surface corrosion performance. In the high temperature environment of welding,