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Oxide metallurgy technology has been developed at Baosteel for improving the heat affected zone toughness of steel plates for high heat input welding.After deoxidation with strong deoxidizers of Mg alloy,the complex inclusions containing parts of compounds of MgO,Ti2O3,MnO,Al2O3,MnS,CaS and TiN are formed.These kinds of inclusions are beneficial for promoting the formation of intragranular ferrite.After two-electrode vibratory electrogas arc welding with the V-type groove and a high heat input of 395 kJ/cm in a single pass,the former austenite grain is very fine in size,with an average grain size of only 85 μm.Excellent heat affected zone toughness is obtained for the developed steel plates with a thickness up to 68 mm.