Application of Cold Stamping Process with 1500 MPa Ultra-High-Strength Steel for Aftermarket BumperYi-Chun Chen, Wan-Ling Chen, Chun-Kai Lin, Yi-Kai Lin and Yu-Lien LiMATEC Web Conf., 408 (2025) 02033DOI: https://doi.org/10.1051/matecconf/202540802033