Hot-Dip Galvanized Galvannealed Coils from China Suppliers - High-Quality Factory Products for Superior Durability

Galvannealed (GA) coils, sourced from reliable China suppliers and produced in top-tier factories, undergo a meticulous two-step manufacturing process. This involves hot-dip zinc coating followed by in-line annealing at temperatures ranging from 500–550°C. This thermal treatment enhances the iron diffusion into the zinc layer, resulting in a robust Zn-Fe intermetallic alloy with 7–15% Fe content, which significantly improves weldability and abrasion resistance. Our GA coils feature a matte-gray finish that adheres to ASTM A653 Grade GA60-GA165 standards, providing a phosphate-free surface that is ideal for paint adhesion. Utilizing our innovative air-knife system allows for precise control of coating weight with an accuracy of ±5 g/m², achieving a total coating weight of 60–180 g/m² (on both sides) and a microhardness range of 250–350 HV. Discover our high-quality galvannealed coils manufactured in China for superior performance and durability.