... tube 2012CrMo15CrMoGB9948-88-furnace tube for Refined petroleum refining plant-heat-exchanger tube- Pipeline seamless pipe10-530×1.5-36 high- ... .53-40 Rectangular TubeQ195,Q235,Q345,20#GB/T6278-2002 Structure, decoration, construction20*20-500*500 ductile iron pipe-ironGB ... industryDN80-1500-square pipeQ195,Q235,Q345,20#GB/T6278-2002 Structure, decoration, construction20*20-500*500ASTM A53 GR.B Carbon ...