... from angel bar,surface settlements include black,picking. stainless steel channel bar1.material:201 202 301 304 316 321 316 310S ... 410 420 430 17-4PH ETC.,stainless steel channel bar2.procedure:hot rolled and welding from angel bar,stainless ... steel channel barraw materials(nickle,crown,etc.,)---smeting into ingots by AOD ...