应用规范 Standard 设计与制造 Design and manufacture GB/T12234 连接端尺寸 Connection dinlension 结构长度 Face to face GB/T12221 法兰尺寸 End flanged JB/T79 检验与试验 Inspection and test JB/T9092 材 料 Material 碳钢 Carbon steel GB/T12229 不锈钢 Stain less steel GB/T12230 标志 Symbol GB/T12220 供货 Supply JB/T7928
