... ,BS4504,SABS1123,EN1092,UNI,GOST12820-80Types: plate, slip on, welding neck, blind, thread, socket weld flangeProcess: free forging, ... SF440,RST37.2,S235,C22.8Zhangqiu Shengli Forging Co., Ltd. is located in the beautiful and rich the Blacksmith ... and complete technical information, has a set of high-quality forging, machining, assembly, inspection, packaging production forged welding neck flange