... , corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16-824×2-100 Casing pipe J55 N80, P110API SPEC ... ,X60 API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60-630×1.53-40 Rectangular TubeQ195,Q235,Q345 ... /2003- Public works, mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square pipeQ195,Q235,Q345,20#GB ...