... resistant,Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16-824×2-100 Casing ... 40 Oil cracking tube 2012CrMo15CrMoGB9948-88-furnace tube for Refined petroleum refining plant-heat-exchanger tube- Pipeline seamless pipe10-530×1 ... line pipe A5L GR.B, X52,X60 API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60-630 ...