... stainless steel pipe Thickness:0.23~1.5mm Diameter:6.5-25.4mm produce 200series&300series&400series CR material 201 stainless steel ... 6K, Mirror Finished, No1, No2, No4, Hair Line with PVC7. Manufacture technology: cold drawn/cold rolled ... ,NO.1-NO.4,8K,and so on.StandardASME, ASTM, EN ,BS,GB,DIN ... after cold rolling, by heat treatment, pickling or other equivalent treatment and lastly by cold rolling ...