E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
Jan. 15, 2025
Although stainless steel flanges have unique advantages in terms of materials, no matter how good they are, they need to be used with caution so that they can be used for a longer time.
So what should be paid attention to when using stainless steel flanges?
1. In order to prevent the heating of the flange cover from causing inter-eye corrosion, the welding current should not be too large, which is about 20% smaller than the current of carbon steel electrodes. The arc should not be too long, and the interlayer should be cooled quickly. It is best to use a narrow weld.
2. The welding rod should be kept dry when used. The 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 (it cannot be dried repeatedly, otherwise the coating will crack and peel off easily). Prevent the electrode coating from sticking to oil and other dirt to avoid increasing the carbon content of the weld and affecting the quality of the weldment.
3. When welding stainless steel flange pipe fittings, carbides are precipitated due to repeated heating, which reduces the corrosion resistance and mechanical properties.
4. The hardened American standard flange of chromium stainless steel flange pipe fittings is larger after welding, which is prone to cracks. If the same type of chromium stainless steel welding rod (G202, G207) is used for welding, it is necessary to preheat above 300℃ and slowly cool at about 700℃ after welding. If the weldment cannot be heat treated after welding, stainless steel flange pipe fitting welding rod (A107, A207) should be used.
5. Stainless steel flange, in order to improve corrosion resistance and weldability, appropriate amounts of stabilizing elements Ti, Nb, Mo, etc. are added, and the weldability is better than chromium stainless steel flange. When using the same type of chromium stainless steel flange welding rod (G302, G307), it should be preheated above 200℃ and tempered at about 800℃ after welding. If the weldment cannot be heat treated, stainless steel flange pipe fitting welding rod (A107, A207) should be used.
The above is a simple introduction to the use of stainless steel flanges, but the specific use process may be more complicated and depends on the specific situation.
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