There are many surface grade states of 410 stainless steel, such as NO.1, 1D, 2D, 2B, N0.4, HL, BA, Mirror and various other surface treatment states. The dirt resistance and corrosion resistance of these different states are also different.
Among them, the 1D surface is also called a fog surface due to its discontinuous granularity. The processing sequence of the surface is hot rolling, annealing shot peening pickling, cold rolling, annealing pickling.
The 2D surface of 410 stainless steel is a slightly glossy silvery white. The processing sequence is hot rolling, annealing shot peening pickling, cold rolling, annealing pickling.
The most common surface of 410 stainless steel is 2B surface, the surface is silver white and has better gloss and flatness than 2D surface. The sequence of the surface processing technology is hot rolling, annealing shot peening pickling, cold rolling, annealing pickling, quenching and tempering rolling.
There is also BA with excellent surface gloss, which has a high reflectivity, which is equivalent to a mirror surface. The sequence of processing technology is hot rolling, annealing shot peening pickling, cold rolling, annealing pickling, surface polishing, quenching and tempering rolling.
The surface of No.3 has better gloss, and the surface has rough lines. The surface processing technology is polishing and tempering rolling for 2D products or 2B with 100~120 abrasive materials (JIS R6002).
The No.4 surface of 410 stainless steel usually has a better gloss and fine lines on the surface. The surface processing technology is polishing and tempering rolling for 2D or 2B with 150~180 abrasive materials (JIS R6002).
The surface of HL is generally silver-gray with hairline streaks. The surface processing technology is to polish 2D or 2B products with abrasive materials of appropriate particle size to make the surface continuous grinding lines.
The surface of MIRRO is in a mirror state. This processing technology is to grind and polish 2D or 2B products with abrasive materials of appropriate particle size to achieve a mirror effect.