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- [21] STUDY OF TOUGHNESS OF WELDED JOINT OF 80 KGF/MM2 CLASS HIGH-TENSILE STRENGTH STEEL FOR LOW-TEMPERATURE SERVICE .3. DEVELOPMENT OF HEAVY SECTION 80 KGF/MM2 CLASS HIGH-TENSILE STRENGTH STEEL WITH HIGH TOUGHNESS OF WELDED JOINT TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 1987, 73 (05): : S611 - S611