... /A213mhigh-temperature resistant,Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16-824×2 ... refining plant-heat-exchanger tube- Pipeline seamless pipe10-530×1.5-36 high-pressure seamless pipe for chemical fertilizer equipment 20 ... tube for boilers and overheating14-426*1.5-4.5 line pipe A5L GR.B, X52,X60 API-for petroleum,natural ...