... forged & machined flanges made from carbon steel material confirming to ASTM, DIN, EN,JIS, GOST, ETC STANDARD: 1)ANSI, DIN, UNI ... , DIN, UNI, BS, JIS, KS standards. the materials are ASTM A105, ST37, Q235, 20 Steel, S.S 304, 304L,316, 316LANSI B16 ...