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Vol.24, No.12, 1279 ~ 1290, 1986
Title
Development of Χ70 HSLA Steel Strip for Arctic Linepipe Application
김태웅Tai Ung Kim, 김재은Jae Eun Kim, 오세익Se Ik Oh, 김영길Young Gil Kim
Abstract
In order to develop an arctic line-pipe of X70 type HSLA steel strip with high toughness and good weldability, additions of several micro-alloying elements and applications of different post-rolling treatments were attempted. On a basic composition of Fe-0.05C-1.0Mn-0.3Si, several micro alloying elements such as Nb, V, Mo and Ni were added. The applied post-rolling treatments were water-spray cooling followed by either furnace cooling or air cooling to room temperature after the final controlled rolling at 800℃. It was found that the steel composition of Fe-0.05C-1.0Mn-0.35Si-0.03Nb-0.05V-0.1 Ni exhibited optimum combination of high strength (Y.S. 75 ksi) and excellent impact toughness 250 joules at -20℃) after the water-spraying to 600℃ followed by a furnace cooling to room temperature. The applied post-rolling treatment was the condition simulating hot strip production. This paper highlights the effects of the micro-alloying elements and the post-rolling treatments on structure and mechanical properties in a low Carbon-Manganese steel.
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