JINAN HYUPSHIN FLANGES CO., LTD supply norm GOST STEEL flanges from China, pressure Class PN0.6MPA to PN10MPA, size DN15 to DN2000, type SLIP ON FLANGE, WELDING NECK FLANGE, PLATE FLANGE, BLIND FLANGE, THREADED FLANGE, LOOSE FLANGE etc, material C22.8, RST37.2, S235JRG2 carbon steel.