... ,GB pipe fittingWe are Hebei Gee Pipe Mill Co., Ltd. which is located in Mengcun County Cangzhou City ... 304, 304L, 316L 321, 347, ETC.03. Implement standard: ASME/ANSI B16.9GB/T12459 GB/T13401SH3408-96 ... 304, 304L, 316L 321, 347, ETC.03. Implement standard: ASME/ANSI B16.9GB/T12459 GB/T13401SH3408-96 ... 304, 304L, 316L 321, 347, ETC.03. Implement standard: ASME/ANSI B16.9GB/T12459 GB/T13401SH3408-96 ...