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Pickled carbon steel pipes undergo an acid - cleaning process to remove the scale and oxide layer formed during hot - rolling, resulting in a clean surface that is suitable for further treatments. They are predominantly used in applications that require subsequent surface coatings, such as electroplating, painting, or powder coating. In the automotive and appliance industries, pickled carbon steel pipes are used for components that need to be painted or coated to enhance corrosion resistance and appearance, like parts of car frames and appliance casings. The furniture industry also utilizes these pipes for manufacturing decorative and structural elements that demand a high - quality surface finish. Additionally, pickled carbon steel pipes are applied in the production of metal artworks and decorative items, where a clean surface is essential for aesthetic and functional purposes.