Alu-Zinc Coated Steel, widely known as GL steel or galvalume steel coil, is the most popular base substrate for color coated steel products in the international metal market. The 55% aluminum, 43.5% zinc and 1.5% silicon alloy coating endows galvalume steel with far stronger anti-corrosion performance than ordinary hot-dip galvanized steel. For more than 15 years, Greendisteel has been focusing on the production and export of high-quality Alu-Zinc Coated Steel (GL). As a comprehensive steel enterprise integrating production, processing and international trade, we supply bulk GL coils to pre-painted steel factories, roofing sheet manufacturers and metal component importers all over the world.
The biggest advantage of Alu-Zinc GL steel lies in its dual anti-rust protection mechanism. The aluminum element forms a dense oxidation film on the surface to block the erosion of moisture and corrosive gas, while the zinc element provides sacrificial cathodic protection for the cutting edge and damaged parts of the steel plate. In coastal areas with heavy salt fog and industrial areas with acid pollution, the service life of galvalume steel is 2 to 4 times longer than that of ordinary GI galvanized steel. Most pre-painted steel manufacturers choose Alu-Zinc coil as the base material, because the alloy coating has excellent paint adhesion, effectively avoiding paint peeling and blistering after long-term outdoor use.
Many overseas importers often encounter tricky problems when purchasing galvalume steel: uneven coating thickness, obvious bare spots on the steel surface, unstable spangle appearance, and high impurity content leading to frequent customer complaints. Greendisteel completely avoids these common quality defects through standardized hot-dip production technology. Our GL production lines adopt continuous hot-dip aluminum-zinc process. We strictly control the temperature of the zinc pot, the running speed of the steel strip and the air knife pressure to ensure uniform coating distribution. We can produce regular spangle, minimized spangle and zero spangle Alu-Zinc steel coils. The coating weight can be customized from 60g/m² up to 275g/m² to meet different anti-corrosion grade requirements.
We can supply Alu-Zinc Coated Steel (GL) in various forms: full hard and soft condition coils, slit narrow strips, cut-to-length flat sheets, and even corrugated galvalume roof sheets. The thickness range covers 0.12mm to 4.0mm, and the width can be customized according to customers’ slitting needs. All raw steel billets are sourced from major domestic steel mills, so the chemical composition and mechanical properties are highly stable. Every consignment of GL steel is accompanied by official mill test certificates, and we accept third-party on-site inspection before loading containers.
Located in Guangzhou, Greendisteel enjoys unique shipping advantages. We have our own 10,000-square-meter warehouse for stocking galvalume steel coils, so we can deliver spot goods within 7 days for small orders. For bulk orders with tens of thousands of tons, our 7 production lines can guarantee stable monthly supply without delaying the construction schedule of overseas projects. Our annual export volume exceeds 400,000 tons, and our GL steel has been shipped to Southeast Asia, the Middle East, Latin America, Eastern Europe and Oceania for many years.
We know that long-term cooperation is built on consistent quality and transparent pricing. Greendisteel never adds extra processing fees or changes quotations arbitrarily. Our technical team can offer professional suggestions on zinc coating weight, material hardness and surface treatment according to your end-use application, whether for making prepainted steel substrates, agricultural greenhouse frames, ventilation pipes, or anti-corrosion roof panels. We welcome both large bulk orders and small trial shipments for new market development.
If you are searching for a direct manufacturer of Alu-Zinc Coated Steel (GL) galvalume coils in China, stop comparing dozens of suppliers. Greendisteel combines factory direct price with strict quality inspection system, helping you cut intermediate costs and reduce after-sales quality risks. Send us your detailed specification list today, and we will prepare free samples and the latest CIF & FOB quotation for you right away.
Post time: Jul-22-2026