... surface settlements include black,picking,bright,drawn bench stainless steel round bar1.material:201 202 301 304 316 321 316 ... and cold drawn stainless steel round barraw materials(nickle,crown,etc.,)---smeting into ingots by AOD oven---hot rolled into black surface ... and plastic3.size:diameter from 1mm to 500mm stainless steel round bar4.surface settlements:black,picking,bright,drawn bench, etc., ...