Stainless steel surface treatment grade and classification

name	surface	feature	Outline of Manufacturing Method	use
original	NO.1	silver white	Surface treated with heat treatment and pickling after hot rolling	Industrial tanks, chemical industry devices, etc., the thickness is thicker from 3.0mm-10.0mm. Applications that do not require glossy surfaces
original	NO.1	matt
blunt side	2D	Slightly shiny silvery white	Hot rolling + annealing shot peening + cold rolling + annealing and pickling	For deep drawing processing, such as automotive components, water pipes, etc. General timber, deep drawing timber
matte	2B	Silvery white with better gloss and flatness than 2D surface 0.39 micron roughness	Hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + tempering rolling	Such as tableware, building materials, etc. With surface treatments that improve mechanical properties, it is suitable for almost all applications.
matte	2B		After NO.2D treatment, the final light cold rolling is carried out through the polishing rod
frosted surface	NO.3	Has better gloss, with discontinuous coarse lines	Products ground with 100-120 abrasive belts	It is used for building interior and exterior decoration materials, electrical products and kitchen equipment, etc.
	NO.4	Has better gloss, with discontinuous coarse lines, and the stripes are thinner than NO.3	Products ground with a 150-180 grit belt	It is used for baths, interior and exterior decoration materials of buildings, electrical products, kitchen equipment and food equipment, etc.
	NO.240	Has better gloss, with discontinuous coarse lines, and the stripes are thinner than NO.4	Products ground with a No. 240 abrasive belt	It is used in bathrooms, building interior and exterior decoration materials, electrical products, kitchen equipment and food equipment, etc.
	NO.320	Has better gloss, with discontinuous coarse lines	Products ground with a No. 320 abrasive belt	Building materials, kitchen utensils
	NO.400	Has better gloss, with discontinuous coarse lines	Products ground with a No. 400 grinding belt	Building materials, kitchen utensils, food equipment, etc.
brushed noodles	HL	Silver-grey with hairline streaks Polish the 2D or 2B with an appropriate particle size abrasive to make the surface continuous	Continuous grinding with a suitable grain size polishing belt to produce a continuous grinding pattern product (subdivision No. 150-320)	Mainly used for architectural decoration, elevators, doors and panels of buildings, etc.
Glossy	BA	Excellent surface gloss with high reflectivity	Usually a bright annealed surface finish with a highly reflective surface	Used in home appliances, mirrors, kitchen equipment, decorative materials, etc.
mirror	6K	A little worse than a mirror	Rough grinding and polishing	mirror, decorative panel
mirror	8K	mirror like	Grinding and polishing	mirror, decorative panel