... ,310,310S,430,430F 3) ISO9001. stainless steel square bar,hot rolled ,polished,various sizes,strict tolerance,high quality etc ... package4.surface:black,pickling,polish,drawn bench,milling, etc .,5.common sizes we have large stocks,diameter from 1mm*1mm-200mm ... *200mm6. application:stainless steel square bar is widely used in chemical, shipping,architecture,machine-made, ...