Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip Process

A792/A792M: Standard Specification for Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip Process

For engineers and designers seeking proven material solutions for demanding environments, understanding ASTM A792/A792M is essential. This industry-leading standard provides the authoritative specifications for steel sheet coated with a 55% aluminum-zinc alloy via a hot-dip process, offering a critical balance of corrosion resistance, heat resistance, and formability. Mastering the requirements of A792/A792M ensures the selection of materials that will perform reliably and durably in a wide array of applications, safeguarding project integrity and longevity.

What is A792/A792M?

ASTM A792/A792M is a comprehensive standard that defines the properties and performance criteria for steel sheet metallically coated with a hot-dip 55% aluminum-zinc alloy. Originating from ASTM International's Committee A05 on Metallic-Coated Iron and Steel Products, its primary purpose is to ensure consistent quality and predictable performance for this specialized coated steel, enabling its confident use in applications requiring enhanced environmental protection.

Scope & Purpose

This standard governs the production and delivery of 55% aluminum-zinc alloy-coated steel sheet, available in both coils and cut lengths. It specifies requirements for various steel designations, including Commercial Steel (CS), Drawing Steel (DS), Forming Steel (FS), High Temperature Steel (HTS), and Structural Steel (SS), catering to diverse application needs. While it details coating composition, weight, and base metal properties, it explicitly references ASTM A924/A924M for general requirements, ensuring a cohesive set of specifications without duplicating information.

Who Must Comply?

• • Primary audience: Materials Engineers, Metallurgists, Design Engineers, Quality Control Inspectors, Production Managers, and Procurement Specialists.
• • Industries affected: Steel Manufacturing, Metal Fabrication, Automotive, Construction (especially roofing and siding), Appliances, and HVAC manufacturing.
• • Compliance nature: While not always legally mandated, compliance is generally considered essential for project specifications and contractual agreements, making it effectively required by industry practice.
• • Enforcement: Compliance is typically verified through internal quality control processes, third-party inspections, and material testing by fabricators and end-users, often referencing certifications provided by the steel manufacturer.

Key Requirements Overview

The standard requires that steel sheet be coated with a 55% aluminum-zinc alloy through a hot-dip process. Professionals must ensure the base metal composition meets the specified requirements for various steel types and grades. Key provisions include adherence to defined coating weight designations (e.g., AZ55), which dictate the level of corrosion and heat resistance. Furthermore, the standard mandates that mechanical properties for structural steel grades meet specific tensile strength and yield strength criteria, with provisions for reporting heat analysis and mechanical property data.

Related Standards & References

ASTM A792/A792M is intrinsically linked with ASTM A924/A924M, the specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process, which provides overarching requirements for testing, sampling, and packaging. For determining the weight of the coating, **ASTM A9