制御圧延鋼における Ti 添加の冶金的効果と機械的性質に及ぼす影響

概要

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The effects of titanium on metallurgical and mechanical properties of controlled rolled steels are investigated and compared with those of niobium. Large TiN particles, existing in high titanium content steels, have little ability to control austenite grain growth in slab reheating. In steels with micro amounts of titanium, finer austenite grain size is observed in slab reheating at high temperatures of above 1200℃. Controlled rolled titanium steels have high strength and excellent toughness, because titanium, similarly to niobium, strongly retards recrystallization of austenite, and strengthens steel by precipitation of TiC. TiN with very low solubility hardly dissolves at all in slab reheating, and resultantly does not contribute to the strength of the steel. Therefore, an effective titanium content, which is defined by (Total Ti-3.4N), is useful for designing steels. Strengthening by 3 kgf/mm^2 in tensile strength per 0.01% effective titanium was observed. Strengthening due to grain refinement and that by precipitation of TiC are almost equal in a 0.1% titanium steel. The value of _vE_s of 0.003%S-Ti steel with 60 kgf/mm^2 in the tensile strength is higher than that of Nb-V steel by about 2 kgf-m, due to sulfide shape control effect by titanium.
社団法人日本鉄鋼協会の論文
1988-01-01