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Precautions for the use of stainless steel flange

1In order to prevent the corrosion of the eye caused by the flange cover, the welding current should not be too large, about 20%less than the carbon steel box, the arc should not be too long, the middle layer should be quickly cooled, the welding seam is should be appropriate. Keep dry. Titanium calcium type should be dried at 150 ° C for 1 hour, and the low hydrogen type should be dried at 200-250 ° C for 1 hour (repeated drying is not allowed, otherwise the coating is easy to crack and fall off) to prevent coating from sticky oil, etc. Dirt, so as not to increase the carbon content of the welding seam, affect the quality of the welding parts. Stainless steel flange tube during welding, repeated heating will precipitate carbides to reduce its corrosion resistance and mechanical properties .
2: stainless steel flange tube welding welding welding After the hardening US standard Frank is large, it is easy to crack. When welding the same type of chromium stainless steel barrier (G202, G207), it must be preheated above 300 ° C, and slowly cooled after welding. At this time, you should choose stainless steel flange pipes (A107, A207).

3: In order to improve the corrosion resistance and welding of stainless steel flange, the right amount of stable elements such as Ti, NB, MO and other stable elements should be added. When chromium stainless steel flange. When using the same type of chromium stainless steel flange welding rod (G302, G307), preheat above 200 ° C and ignite at 800 ° C after welding. (A107, A207).


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