Carbon Steel Pipe with High Quality 1.WT:4-70mm OD:25- ... tube- Pipeline seamless pipe10-530×1.5-36 high-pressure seamless pipe for chemical fertilizer equipment 20,16Mn, ... API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60-630×1.53-40 Rectangular TubeQ195, ... works, mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square pipeQ195,Q235,Q345,20 ...