The main difference in the quality of color coated galvanized sheet electric heating pipe is the content of nickel. Nickel is an excellent corrosion-resistant material. After stainless steel and chromium are combined, the corrosion resistance and process performance are improved. However, in order to obtain pure austenite structure, the nickel content of low-carbon nickel steel should reach 24%. Only when the nickel content is 27%, the corrosion resistance of steel in some media can change significantly. The corrosion resistance of color coated galvanized sheet mainly depends on its alloy composition and internal structure, and chromium plays a major role. Chromium has high chemical stability, can form a passive film on the steel surface, isolate the metal from the outside, protect the steel plate from oxidation and increase the corrosion resistance of the steel plate.The price of 310S color coated galvanized sheet has two characteristics: durability and almost no need to maintain the surface, which makes people pay more attention to its application than ever before. The prices of most building materials have increased rapidly in a certain proportion, and the price increase of many materials is much higher than that of 310S color coated galvanized sheet materials. The arc starting and ending of spot welding shall transition smoothly, the weld shall not be too high, and good fusion must be ensured to prevent incomplete penetration, slag inclusion and other defects.