Galvalume Steel Coil - ASTM A792 Hot-Dip Galvanized Aluminum-Zinc Alloy Coated

Galvalume steel coil represents a premium-grade metallic-coated steel product featuring a hot-dip aluminum-zinc alloy coating that delivers exceptional corrosion resistance and thermal reflectivity. Engineered specifically for roofing, siding, and architectural applications, this advanced coated steel combines the barrier protection of aluminum with the galvanic protection of zinc, offering superior performance in coastal, industrial, and agricultural environments. Manufactured according to ASTM A792/A792M standards, our Galvalume steel coil serves construction contractors, metal building manufacturers, and roofing professionals seeking long-term durability with minimal maintenance requirements.

What is Galvalume Steel Coil?

Galvalume steel coil is a cold-rolled carbon steel substrate coated with an aluminum-zinc alloy composition consisting of 55% aluminum, 43.4% zinc, and 1.6% silicon by weight. This proprietary coating is applied through a continuous hot-dip process at temperatures exceeding 600°C, creating a metallurgical bond with the steel base. The unique alloy composition provides both barrier protection from aluminum and sacrificial protection from zinc, resulting in corrosion resistance up to four times greater than conventional galvanized steel in most atmospheric environments.

Galvalume Steel Coil Technical Specifications

Our Galvalume steel coil complies with ASTM A792/A792M-20 Section 6 requirements, featuring coating designation AZ50 to AZ185 (coating mass of 0.50 to 1.85 oz/ft² per side). The substrate consists of commercial quality (CQ), drawing quality (DQ), or structural quality (SS Grade 33-80) steel with thickness ranging from 0.0142 to 0.0897 inches (0.36 to 2.28 mm). Coating thickness measures 0.0008 to 0.0030 inches (20 to 76 micrometers) per side, providing minimum spangle designation as per ASTM A792 Table 3. Tensile strength varies from 33,000 to 80,000 psi depending on grade selection, with yield strength ranging from 33,000 to 70,000 psi per ASTM A653/A653M structural requirements.

Why Choose Our Galvalume Steel Coil

Our mill-direct Galvalume steel coil delivers cost-effective solutions backed by comprehensive quality certifications including mill test reports per ASTM A792 Section 17 and ISO 9001:2015 manufacturing standards. We maintain extensive inventory across coating weights AZ50, AZ55, and AZ70 in standard coil widths from 24 to 72 inches, enabling rapid fulfillment for both large-scale construction projects and custom fabrication requirements. Our technical support team provides coating selection guidance, formability analysis, and paint system compatibility recommendations to optimize performance in your specific application environment.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard minimum order quantity for Galvalume steel coil is 25 metric tons per specification, though we accommodate smaller quantities for trial orders or custom coating weights. Mixed container loads combining different thicknesses or widths can be arranged to meet your 20-foot container capacity of approximately 22-24 tons, allowing flexibility for diverse project requirements without excess inventory.

Do you provide material test certificates?

Yes, we supply comprehensive mill test certificates (MTC) per EN 10204 Type 3.1 documentation for every coil, including chemical composition analysis per ASTM E415, coating weight verification per ASTM A90, and mechanical property testing per ASTM A370. Additional third-party inspection services through SGS, BV, or Intertek can be arranged at your request, with reports covering dimensional tolerances, surface quality assessment, and coating adhesion testing per ASTM D3359.

What is the typical delivery time?

For standard specifications (AZ50-AZ70 coating, 0.0179-0.0478 inch thickness, 48-inch width), our delivery timeline is 25-30 days from deposit receipt to FOB loading port. Custom coating weights, non-standard widths, or specific substrate grades may require 35-45 days production lead time. We maintain strategic warehouse inventory in major ports enabling 7-10 day delivery for frequently ordered specifications, with real-time stock availability provided upon inquiry.

Can you cut to custom sizes?

Absolutely. Our processing facility offers precision slitting services to custom widths with tolerance of ±0.0625 inches, and cut-to-length processing for sheets ranging from 48 to 240 inches in length. We provide edge conditioning options including deburred edges, rounded corners, and protective edge coating to prevent handling damage. Minimum processing quantity applies at 5 tons per width specification, with combined orders eligible for reduced processing fees.

Get a Competitive Quote for Galvalume Steel Coil

Request your factory-direct pricing today by submitting your specifications including coating weight, thickness, width, quantity, and delivery destination. Our sales engineers respond within 4 business hours with detailed quotations covering material cost, processing fees, packaging options, and freight estimates. Volume discounts available for orders exceeding 100 tons, with flexible payment terms and letter of credit acceptance for established accounts.