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How to anneal butt welded flanges

How to anneal butt welded flanges

The pressure of the protective gas for the welding flange is to avoid slight leakage of the welding flange. The protective gas in the furnace should be connected to a certain positive pressure, assuming it is a hydrogen protective gas, which is generally required to be above 20kBar. Annealing air, welding flanges generally use pure hydrogen gas as the annealing air, with a purity of over 99.99%. If the other part of the air is an inert gas, its purity can be lower, but it cannot contain too much oxygen and water vapor.

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Polishing method for dual phase steel flanges

Polishing method for dual phase steel flanges

1. There are four polishing methods for dual phase steel flanges: manual, mechanical, chemical, and electrochemical. Polishing can improve the corrosion resistance and decoration of flanges. The existing stainless steel electric polishing fluid still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the wastewater, causing pollution to the environment.

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