steel pipe for construction 1)OD:4mm-50mm; ... /T3639-2000DIN2391For the automotive, motorcycle, engineering machinery, jack, electrical tools and sporting equipment and ... Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16 ... textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square pipeQ195,Q235,Q345,20 ...