... -2002GB/T 14975-2002 -Decorative Stainless Steel 4-426×1-40 Structural Pipe 10,20,35,45,Q23516Mn Q345BGB/T8162-2008--for ... -heat-exchanger tube- Pipeline seamless pipe10-530×1.5-36 high-pressure seamless pipe for chemical fertilizer equipment 20,16Mn,Q345GB6479-2000Fertilizer ... vessel manufacturing- tube for boilers and overheating14-426*1.5-4.5 line pipe A5L GR.B, X52,X60 API-for petroleum ...