304 stainless steel surface process classification

304 stainless steel comes in various surface finishes, each with unique characteristics and applications. The original surface, known as NO.1, is produced after hot rolling, heat treatment, and pickling. It is typically used for cold-rolled materials and industrial applications such as tanks and chemical equipment, with thickness ranging from 2.0mm to 8.0mm. NO.2D is a dull surface achieved through cold rolling, followed by heat treatment and pickling. This finish is soft and silvery-white, making it ideal for deep drawing processes like automotive parts and water pipes. When it comes to 304 stainless steel tube pricing, this surface type is often considered cost-effective for specific uses. NO.2B is a slightly brighter surface that undergoes cold rolling, heat treatment, pickling, and finishing rolling. Its smooth texture allows for easy re-grinding to enhance brightness, making it widely used in tableware and construction materials. With improved mechanical properties, it suits a broad range of applications. NO.3, also known as coarse sand, is created using a 100–120 grit grinding belt. It has a better gloss and visible, discontinuous rough lines. Commonly used in interior and exterior decorative elements, electrical appliances, and kitchen equipment. NO.4, or fine sand, is ground with a 150–180 grit belt, offering a smoother finish than NO.3. It is thinner and more refined, suitable for bathrooms, architectural interiors, kitchen appliances, and food processing equipment. NO.320 is a finer surface treated with a 320-grit belt. It provides a higher gloss and even smoother texture compared to NO.4, making it ideal for similar applications including kitchens, food equipment, and electrical products. HL (Hairline) is a continuous grind using abrasive belts of 150–320 grit, creating a consistent, linear pattern. It's commonly used in architectural design, elevator panels, building doors, and other decorative surfaces where a sleek appearance is desired. BA (Bright Annealed) is a highly reflective surface achieved through cold rolling, smoothing, and bright annealing. It resembles a mirror finish, offering excellent reflectivity and high gloss. It's frequently used in home appliances, mirrors, kitchenware, and decorative materials where aesthetics are key. Each surface finish offers distinct advantages, and the choice depends on the intended use, budget, and visual appeal required. Understanding these classifications can help in selecting the right type of 304 stainless steel for your project.

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