70, 80kgf/mm^2 級 Ti 添加ベイナイト熱延鋼板の開発(製造技術)(<特集>高強度薄鋼板)

概要

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The fundamental researches and the mill trials have been carried out in order to determine the suitable manufacturing conditions for Ti-containing bainitic 70 and 80 kgf/mm^2 class steel sheets with excellent bending and stretch-flanging formability. The results obtained are as follows : (1) Addition of Ti to low C-2.0Mn steel enhances acicularity, and the higher the acicularity, the better is the tensile strength-notch elongation balance without decrease of tensile strength-elongation balance. (2) The tensile strength-notch elongation balance of 0.03C-Ti bearing steel is better than that of 0.08C-Ti bearing steel. (3) The excellent stretch flanging formability of 70 kgf/mm^2 class hot rolled steel sheets is obtained in 0.03C-0.5Si-2.0Mn-0.3Cr-0.08Ti steel coiled at about 600℃. (4) The excellent bending formability of 80 kgf/mm^2 class hot rolled steel sheets is obtained in 0.08C-0.5Si-2.0Mn-0.3Cr-0.15Ti steel coiled at about 550℃.
社団法人日本鉄鋼協会の論文
1982-07-01