ULTRA-HIGH STRENGTH STEEL SHEET WITH EXCELLENT CRASHWORTHINESS, AND METHOD FOR MANUFACTURING THE SAME

摘要

The present invention relates to a super high strength steel plate having excellent collision properties and a manufacturing method thereof. The present invention obtains super high strength steel by controlling contents of austenite element and processing and hardening the same through re-rolling. The present invention also obtains excellent yield strength and excellent collisional properties. [Reference numerals] (AA) Tissue of invented steel before re-rolling; slenderness ratio = about 1;(BB) Tissue of invented steel after re-rolling; slenderness ratio > 2