... wide range of forged & machined flanges made from carbon steel material confirming to ASTM, DIN, EN,JIS, GOST, ETC ... welding 3)Size:1/2''-48''Our Carbon Steel Flange and Stainless Steel Flange be according to ANSI, DIN, UNI, ... standards. the materials are ASTM A105, ST37, Q235, 20 Steel, S.S 304, 304L,316, 316LANSI B16.5 / ASME ... 30K Flanges. Normal Size: DN15--DN2000mm ( 1/2"-48") flat flange pn16