| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material which can enhance the energy absorbability at a crash and thus exhibits excellent crashworthiness, and to provide a manufacturing process therefor.SOLUTION: The steel material with excellent crashworthiness is formed so that: the composition of the steel material satisfies Ceq≤0.36%; the structure thereof comprises a ferrite phase and a hard phase; and the ferrite phase exhibits a volume fraction of 75% or more across the entire plate thickness, a hardness Hv of 140 to 160, and an average grain size of 2 μm or larger. |
