Astm A276 410 430 Stainless Steel Round Bar for Grab Bar
1. Welding seam defects: Welding seam defects are serious and need to be compensated by manual mechanical grinding. The resulting grinding marks will cause the surface to be uneven and affect the appearance.
2. Inconsistent surface: only pickling and passivating the welds also results in uneven surfaces and affects the appearance.
3. Scratches are difficult to remove: overall pickling and passivation cannot remove various scratches produced during processing, and impurities such as carbon steel and spatter that adhere to the surface of stainless steel due to scratches and welding spatter cannot be removed. Causes chemical corrosion or electrochemical corrosion to cause rust in the presence of corrosive media.
4. Uneven grinding and polishing passivation: Pickling and passivation treatment is carried out after manual grinding and polishing. For workpieces with a large area, it is difficult to achieve a uniform treatment effect and an ideal uniform surface cannot be obtained. Moreover, the cost of labor hours and auxiliary materials are also higher.
5. Limited pickling ability: Pickling passivation paste is not suitable, and it is difficult to remove the black oxide scale produced by plasma cutting and flame cutting.
6. The scratches caused by human factors are relatively serious: During hoisting, transportation and structural processing, scratches caused by human factors such as bumping, dragging and hammering are relatively serious, which makes surface treatment more difficult, and also causes corrosion after treatment. main reason.
7 Equipment factors: Scratches and creases caused during the rolling and bending process of profiles and plates are also the main reasons for rust after treatment.
8 Other factors: During the procurement and storage process of stainless steel raw materials, the bumps and scratches caused by hoisting and transportation are also serious, which is also one of the causes of rust.