| 摘要 |
PROBLEM TO BE SOLVED: To obtain hot rolled steel for structural purpose low in yield strength and narrow in the strength range thereof as hot-rolled. SOLUTION: A steel stock having a compsn. contg., by mass, <=0.005% C, <=0.05% Si, <=0.25% Mn, <=0,10% Al, and <=0.005% N furthermore contg. one or >= two kinds selected from 0.02 to 0.10% Ti, 0.02 to 0.10% Nb and 0.01 to 0.10% V, and the balance Fe with inevitable impurities is heated at 1,100 to 1,270 deg.C and is thereafter hot-rolled in such a manner that the range of the finishing temp. is controlled to 950 to 900 deg.C.
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