... ,316,316L,321 and so on. 3. Standard:GB,JIS,BS,DIN.UNI,ANSI/ASTM ASME,,API, NF ,GOST and Non ... certificate :ISO9001 :2008 10. Marking :according to client's requirement 11. QC staff :10-15. 12. Inspection :in-house and the ... . We warmly welcome you visit us any time ! high quality bs 304 316 Stainless Steel Flange