steel pipe for construction 1)OD:4mm-50mm; WT: ... resistant,Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16-824 ... ×1.5-36 high-pressure seamless pipe for chemical fertilizer equipment 20,16Mn,Q345GB6479-2000Fertilizer ... 2002 Structure, decoration, construction20*20-500*500 ductile iron pipe-ironGB/T13295-2003 ISO2531/2003- Public works ...