General stainless steel with thickness between 0.01-1.5mm, strength between 600-2100N / mm2 and heat-resistant cold-rolled stainless steel are defined as high-strength precision stainless steel. The error around 5um or even lower of precision stainless steel plate in the manufacturing process is much smaller than that of ordinary sheet.
BA surface is a special finish, like mirror finish but not bright enough to mirror. Bright annealing also be called as brilliant annealing, is to anneal the products in a confined space slowly cooling at least 500 degrees, then make the products natural cooling still in the enclosed space, after that to get the brightness and beautiful surface, and without causing decarburization situation.
NO.4 is one of brushed or polished surface, it is similar with HL surface, but a little different, usually if we find a long and continue line it is HL, other is NO.4 or NO.3,NO.5. etc.
430 is a ferritic stainless steel, 430 16Cr is a representative type of ferritic steel, thermal expansion rate, excellent formability and oxidation resistance. Heat-resistant appliances, burners, household appliances, type 2 cutlery, kitchen sinks, exterior trim materials, bolts, nuts, CD rods, screens. Because of its chromium content, it is also called 18/0 or 18-0. Compared to 18/8 and 18/10, the chromium content is slightly lower and the hardness is reduced accordingly.
410 hot rolled stainless steel coil has good corrosion resistance and machinability. It will harden after heat treatment. It is generally used to make blade and valve tools. 410 stainless steel has good corrosion resistance and machining performance. It is a general purpose steel and cutting tool steel. 410S is a steel grade that improves the corrosion resistance and formability of 410 steel.
321 stainless steel is a high-strength steel, which is more resistant to high temperatures than 316L. It has better corrosion resistance in organic acids at different concentrations and at different temperatures, especially in oxidizing media. 321 stainless steel is often used in the manufacture of ducts, acid-resistant containers and wear-resistant equipment.