高压容器用无缝钢管
Seamless steel tube for high pressure vessel service
结构用无缝钢管
seamless steel tubes for structural purposes
起重机臂架用无缝钢管
Seamless steel tube for fabrication of Crane gib arm
钻探用无缝钢管
seamless steel tube for drilling
不锈钢无缝钢管
Seamless stainless steel tube
当代石油石化
petroleum & petrochemical today
跨国石油石化公司
multinational petroleum and petrochemical company
石化用钢
Steels for petroleum and chemical industries
石油裂化
petroleum cracking process
石油石化
Petroleum and Petrochemical
Petroleum and Petrochemical Industry
petrochemical
石油石化产业
Petroleum and Petrochemical Industry
石油石化工业
Petroleum and Petrochemical Industry
Petroleum and Petrochemical Industries
石油石化节能
energy conservation in petroleum&petrochemical industry
石油石化企业
petrolic or petrochemical enterprises
Petroleum and Petrochemical Enterprises
petrochemical enterprise