... motorcycle, engineering machinery, jack, electrical tools and sporting equipment and other areas10-180×2-24 High Pressure Boiler ... Rectangular TubeQ195,Q235,Q345,20#GB/T6278-2002 Structure, decoration, construction20*20-500*500 ductile iron pipe- ... ironGB/T13295-2003 ISO2531/2003- Public works, mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square ...