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What do stainless steel coil surface 2B and BA mean respectively?

There are many kinds of stainless steel coil product surfaces, of which 2B and BA are the two most important surfaces. What do 2B and BA mean respectively?

They refer to different categories of surface treatment processes for cold-rolled stainless steel coils. Among them, the formation of 2B is cold rolling--annealing and pickling--flattening, and the formation of BA is cold-rolling--bright annealing-flattening. The main difference is annealing The process is different, 2B is annealing and pickling, the surface is oxidized to a certain extent, and it is darker; BA is bright annealing, the surface is not oxidized, and it is brighter.