高張力鋼の制御圧延における冶金的因子とホットストリップへの適用

抄録

From the standpoint of improving the mechanical prop erties and particularly weldability in high tensile strength steels, much attention has been paid to the controlled rolling which has possibilities to make full use of potentiality existed in materials. In this paper, general review on this method is done. That is; firstly, the relation between mechanical properti es and microstructures is mentioned. Secondly, the important variables which affect controlled rolling are considered;(1) the amount of hot-working, (2) the temperature range over which hot-working is applied, (3) the rate of recrys-t allization in deformed austenite, (4) possible causes of the retardation of recrystallization by the addition of alloying elements, (5) the role of carbonitrides, (6) chemical composition of steels, and (7) the rate of cooling following rolling and particularly during the transformation range. Lastly, the application of the controlled rolling to hot strip is considered and typical examples of controlled rolled hot strips are exhibited.