High strength steel plates for oil storage tanks are usually produced by Quenched and Tempered (Q&T) process which results in high energy cost. On the other hand, large-heat-input welding technologies, such as electro-gas welding, have been widely applied during large oil storage tanks construction. In the present paper, High strength steel plates for 150000 m3 oil storage tanks have been developed by Thermal Mechanical Control Process (TMCP) and Tempered process (TMCP-T). The effects of tempered temperature and Niobium content on mechanical performances of plates are investigated. High strength and high toughness as well as excellent large-heat-input weldability for Nb-bearing steel plates are observed and the reasons are discussed.

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