1.ANSI standard flanges 2.Materials:stainless steel 304,304L,316,316L,321 3.Standard:JIS,GB,DIN,ANSI 4.ISO 9001 Certificate. 1.ANSI Standard weld neck flanges2.Materials:stainless steel 301,304,304L,316,316L,321,carbon steel 20Mn,20#,16Mn,20G3.Standard:JIS,DIN,ANSI,GB,ANSI4.OEM service available.5.ISO 9001 Certificate