... carbon steel flange. 2.carbon steel flange 3.API BV ISO 4.150LB,300LB,600LB,90 Forged Steel flangeProduct namePipe flangesize ... , Offshore, Gasoline, Water Systerm, Electrical factory, Building ConstructionStandardISO, SNSI, JIS, DIN, GB/T12459,GB/T13401,ASME B16.9.SH3408 SH3409, HG ...