HOT Forged Steel flange 1.we have all kinds of carbon steel flange. 2.carbon steel flange 3.API BV ISO 4.150LB,300LB,600L HOT Forged Steel flangeProduct namePipe flangesize DN10---DN3000MaterialCARBON STEELUsed inOil Field, Offshore, Gasoline, Water Systerm, Electrical factory, Building ConstructionStandardISO, SNSI, JIS, DIN, GB/T12459,GB/T13401,ASME B16.9.SH3408 SH3409, HG/T21635,HG/T21631,SY/ ...