High-strength steel for automobiles is an advanced metallic material system specifically developed to meet the requirements of lightweight vehicle bodies and collision safety. Based on microstructure and strengthening mechanisms, it is mainly divided into traditional high-strength steel (such as bake-hardening steel BH and high-strength low-alloy steel HSLA) and advanced high-strength steel (AHSS). AHSS includes dual-phase steel (DP), complex-phase steel (CP), transformation-induced plasticity steel (TRIP), martensitic steel (MS), and hot-formed boron steel, etc. This type of material, through multiphase microstructure control, possesses excellent tensile strength (typically ≥340MPa, high-end products can reach over 2000MPa) and energy absorption capacity, and is widely used in critical safety components such as A/B pillars, crash beams, and chassis structural parts.