... round bar,hot rolled and cold drawn,surface settlements include black,picking,bright,drawn bench stainless steel bar1.material:201 202 ... and cold drawnraw materials(nickle,crown,etc.,)---smeting into ingots by AOD oven---hot rolled into black surface---picking into acid liquid ... and plastic3.size:diameter from 1mm to 500mm4.surface settlements:black,picking,bright,drawn bench, etc., stainless steel ...