How to remove scale on stainless steel seamless pipe

During the use of stainless steel seamless pipes, due to the influence of the external environment and conditions, the internal structure changes and oxide scale is produced. The oxide scale existing on the surface of stainless steel has a dense structure and strong adhesion to the substrate. It must be removed first before subsequent decorative treatments such as passivation, electroplating, and coloring. The existence of oxide scale will have a great impact on the quality of stainless steel, so the oxide scale must be treated. The following will introduce the oxidation scale treatment method of stainless steel seamless pipe.

Chemical composition of stainless steel oxide scale.

Stainless steel contains chromium, nickel, iron, a small amount of carbon and silicon, and may contain manganese, titanium, molybdenum, tungsten and other elements. During smelting, casting, hot rolling, heat treatment, welding and other processes, oxidation will inevitably be generated. There are a variety of oxide structures in the skin and oxide skin compositions.

Stainless steel seamless pipe oxide scale treatment method

Step One: Mechanical Cutting Method

This is a more common approach. When the stainless steel oxide scale is thick or hard, mechanical cutting is often used. This method uses mechanical force to cut off the oxide scale, so that the stainless steel surface can be restored to a smooth and bright surface state.

Step 2: Pickling method

Pickling is a relatively common treatment method. The principle of this method is to use chemical reactions to remove oxide scale on the surface of stainless steel. The stainless steel surface treated by pickling method is better in appearance and quality. However, improper pickling method can also cause harm to the environment, so attention should be paid to protecting the working environment.

Step Three: Electrolytic Peeling Method

The electrolytic peeling method uses electrochemical principles to peel off the oxide scale on the surface of stainless steel through electrolytic chemical reaction. The stainless steel treated by electrolytic peeling has high surface finish and stable quality. However, the electrolytic peeling method requires large equipment costs and technical requirements, and the treatment effect is good but the cost is high.

Step 4: Sandblasting

Sand blasting is a method that uses high-pressure gas or water to spray high-efficiency abrasive tools onto the stainless steel surface, and then removes oxide scale by abrasive impact and friction on the stainless steel surface. The surface of stainless steel treated by sandblasting is bright and smooth, but oxide scale will occur again.

Summarize:

The above four stainless steel seamless pipe oxide scale treatment methods have their own advantages and disadvantages, and should be selected according to different production processes, working environments, material prices and other factors. In addition, to maintain the cleanliness of the stainless steel surface, you can wipe the surface with a soft, non-acidic towel. At the same time, you can also use special stainless steel cleaners, but be careful not to overdose when using them to avoid secondary pollution.

Article source: https://article-realm.com/article/Business/53687-How-to-remove-scale-on-stainless-steel-seamless-pipe.html