304 stainless steel surface process classification

304 stainless steel comes in various surface finishes, each with its own unique characteristics and applications. The original surface, known as NO.1, is achieved through hot rolling, heat treatment, and pickling. It's typically used for cold-rolled materials and is common in industrial tanks, chemical equipment, and other heavy-duty applications. This finish ranges in thickness from 2.0mm to 8.0mm. NO.2D is a slightly smoother surface, obtained after cold rolling, heat treatment, and pickling. It has a silvery-white appearance and is ideal for deep drawing processes, such as in automotive parts or water pipes. The 304 stainless steel tube price varies depending on the finish and application. NO.2B is a more refined version of NO.2D, featuring a moderate level of brightness due to finishing rolling. It's smooth and easy to re-grind, making it suitable for a wide range of uses, including tableware and construction materials. Its improved mechanical properties make it a versatile choice for most applications. NO.3 is created using a 100-120 grit grinding belt, resulting in a coarser texture with a better shine and visible, discontinuous lines. It's often used in interior and exterior decorative elements, electrical appliances, and kitchen equipment. NO.4 features a finer finish, produced with a 150-180 grit belt. It offers a higher gloss than NO.3 and is thinner, making it suitable for bathrooms, kitchen appliances, and food processing equipment. #320 is similar to NO.4 but uses a finer 320-grit belt, resulting in an even smoother surface with less pronounced texture. It’s commonly found in kitchens, bathrooms, and commercial food equipment. HL (Hairline) is a continuous grind using abrasives ranging from 150 to 320 grit, creating a fine, linear pattern. This finish is widely used in architectural design, elevator panels, and building doors. BA (Bright Annealed) is a highly reflective surface achieved through cold rolling, smoothing, and bright annealing. It resembles a mirror finish and is ideal for home appliances, mirrors, and high-end decorative applications.

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