용접열 영향부 강도가 우수한 열연강판

Hot-rolled steel sheet having excellent heat-affected-zone strength

Abstract

The present invention relates to a hot-rolled steel sheet having excellent strength of heat-affected-zone (HAZ). The present invention is to provide a hot-rolled steel sheet having tensile strength of the HAZ equal or similar to a base material by preventing the strength of the HAZ from degrading when high-strength steel of the base material is welded. The hot-rolled steel sheet according to an embodiment of the present invention includes components containing 0.08-0.1 wt% of C, 0.1-0.3 wt% of Si, 1.6-2.0 wt% of Mn, 0.2-1.0 wt% of Ni, 0.1-0.3 wt% of Mo, 0.2-0.5 wt% of Cu, 0.05-0.2 wt% of Ti, 0.002-0.005 wt% of B, and the remainder consisting of Fe and inevitable impurities.
본 발명의 일측면은 모재의 강도가 높은 강을 용접할 때, 용접열영향부의 강도가 저하되는 것을 방지하여 모재와 동등 또는 유사한 용접열영향부 인장강도를 가지는 열연강판을 제공하고자 하는 것이다.

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