High-Quality Hot-Dip Galvanized Galvannealed Coils from China Suppliers and Factory - Superior Weldability and Finish

Discover high-quality Galvannealed (GA) coils manufactured by leading China suppliers. Our GA coils undergo a precise two-step process: first, they are hot-dip zinc coated, and then they are subjected to in-line annealing at temperatures between 500–550°C. This thermal treatment effectively diffuses iron into the zinc layer, resulting in a Zn-Fe intermetallic alloy with 7–15% Fe content, which enhances weldability and abrasion resistance, Featuring a matte-gray finish, our GA coils comply with ASTM A653 Grade GA60-GA165 standards, offering a phosphate-free surface that promotes excellent paint adhesion. As a reputable factory in the industry, we utilize a proprietary air-knife system to control the coating weight with remarkable accuracy of ±5 g/m². Our products achieve a total coating weight of 60–180 g/m² on both sides, paired with a microhardness of 250–350 HV. Trust our China factory for your Galvannealed coil needs, and experience the difference in quality and performance