No.1 surface
Processing type: hot rolling, annealing, descaling
Status characteristics: rough, dull
Main content: After hot rolling to the specified thickness, it is then annealed and descaled. It is usually used in industrial applications, heat and corrosion resistance, and is not required for surface smoothness.
2D surface
Processing type: cold rolling, heat treatment, pickling or phosphorus removal
Status characteristics: uniform surface, matt
Main content: heat treatment after cold rolling, pickling. The matt surface is produced by pickling or phosphorus removal. It can be flattened with a matte roll. The matte finish facilitates retention of the lubricant on the round steel surface during deep drawing. This surface is suitable for processing deep-drawn fasteners, but these parts need to be polished after they are formed.
2B surface
Processing type: cold rolling, heat treatment, pickling or phosphorus removal, bright processing
Status feature: smoother and straighter than 2D surface
Main content: On the basis of the 2D surface, the heat-treated and dephosphorized steel is polished with a small amount of polishing stick. It is a commonly used surface finish that can be used for any purpose except for complex fastener deep drawing.
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