1,620MPa級超高強度焼入れドアインパクトビーム用熱延鋼板

摘要

近年，衝突安全に関するFMVSS（Federal Motor Vehicle Safety Standard No.214）やIIHS（Insurance Institute for Highway Safety）のさらなる強化や評価基 準の改訂により，安全および軽量化の両面から超高強度 を有する鋼板や部材のニーズが増大してきており，自動 車のドアやバンパの補強部品に980MPaを超える超高強 度の鋼板が使用されている。%As the regulations for side impact safety of automobiles become more stringent, higher strength door impact beams (DIBs) have become necessary. Recently, an ultra-high-strength, hot rolled steel has been developed for this purpose. Due to its optimized chemical composition, the newly developed steel also exhibits excellent delayed-fracture resistance characteristics. DIBs made of the newly developed steel respond very well to crash situations and have a delayed fracture resistance of 1,620 MPa. Applications for this newly developed steel are expected to grow.