Galvannealed (GA) steel represents a remarkable advancement in steel technology. It features a zinc coating on both sides, with a unique, slightly rough surface texture that provides superior paint adhesion. This distinctive property leads to painted GA surfaces exhibiting exceptional corrosion resistance, surpassing the performance of painted GI surfaces. The versatility of GA steel extends across a range of industries, including automotive and electrical appliances. Moreover, in response to the evolving needs of these industries, we have developed ultra-high-strength steel materials. These innovations empower automobile and appliance manufacturers to reduce product weight while preserving structural integrity—a pivotal step towards achieving lightweight, high-performance solutions.