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Polishing method of dual phase steel flange

2023-06-13

1. There are four polishing methods for dual-phase steel flanges: manual, mechanical, chemical and electrochemical. The corrosion resistance and decoration of the flange can be improved by polishing. The existing stainless steel electro-polishing liquid still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the wastewater. Pollution to the environment.

1. There are four polishing methods for dual-phase steel flanges: manual, mechanical, chemical and electrochemical. The corrosion resistance and decoration of the flange can be improved by polishing. The existing stainless steel electro-polishing liquid still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the wastewater. Pollution to the environment.

2, dual-phase steel flange surface will form a passive film, while the oxide film began to dissolve. Because the dual-phase steel flange surface micro-inconsistent, surface micro-convex part of the preferential dissolution, dissolution rate will be greater than the concave, film dissolution and formation almost at the same time, but the speed is different. As a result, the surface roughness of the dual-phase steel flange becomes low, and a smooth and shiny surface is obtained.

3. Polishing can fill some surface defects such as surface pores and scratches, thereby improving fatigue resistance and related corrosion resistance. Dual phase steel flange yield strength than austenitic stainless steel is more than twice as high, but also the molding required enough plastic toughness, as well as superior resistance to stress corrosion cracking ability, especially in the chloride ion environment.

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How to anneal butt welding flange

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Polishing method of dual phase steel flange

1. There are four polishing methods for dual-phase steel flanges: manual, mechanical, chemical and electrochemical. The corrosion resistance and decoration of the flange can be improved by polishing. The existing stainless steel electro-polishing liquid still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the wastewater. Pollution to the environment.

2023-06-13

How to anneal butt welding flange

Welding flange shielding gas pressure, in order to avoid welding flange slight leakage, the furnace shielding gas to a certain positive pressure, assuming hydrogen shielding gas, the general requirements of more than 20kBar. Annealing air, welding flange generally use pure hydrogen as annealing air, air purity of more than 99.99%. If the other part of the air is an inert gas, the purity can be lower, but it cannot contain too much oxygen and water vapor.

2023-06-13

German standard flange: flange connection is divided into several kinds?

German standard flange: flange connection is divided into several kinds? At present, many people do not know the flange of German Standard. Now many people do not know what the flange is. Flanges are actually very common in pipelines. So German Standard Flange: How many kinds of flange connection methods are there?

2023-06-13

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