Standard Specification for Steel Sheet Galvalume ASTM A792

I. Classification of Aluminum – zinc Alloy – Coated by the Hot Dip process (Galvalume – GL)

1. Scope Standard Specification for Steel Sheet Galvalume ASTM A792
1.1 This specification covers 55 % aluminum-zinc alloy coated steel sheet in coils and cut lengths.
1.2 This product is intended for applications requiring
corrosion resistance or heat resistance, or both.
1.3 The product is produced in a number of designations,
types, and grades which are designed to be compatible with
differing application requirements.
1.4 Product furnished under this specification shall conform
to the applicable requirements of the latest issue of Specification A 924/A 924M, unless otherwise provided herein.
1.5 This specification is applicable to orders in either
inch-pound units (as A 792) or SI units (as A 792M). Values in
inch-pound and SI units are not necessarily equivalent. Within
the text, SI units are shown in brackets. Each system shall be
used independent of the other.
1.6 Unless the order specifies the “M” designation (SI
units), the product shall be furnished to inch-pound units.
1.7 The text of this specification references notes and
footnotes that provide explanatory material. These notes and
footnotes, excluding those in tables and figures, shall not be
considered as requirements of this specification.
1.8This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents Standard Specification for Steel Sheet Galvalume ASTM A792
2.1 ASTM Standards Galvalume ASTM A792
A 90/A 90MTest Method for Weight [Mass] of Coating on
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
A 568/A 568MSpecification for Steel, Sheet, Carbon, and
High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled,
General Requirements for
A 902Terminology Relating to Metallic Coated Steel Products
A 924/A 924MSpecification for General Requirements for
Steel Sheet, Metallic-Coated by the Hot-Dip Process
E 517Test Method for Plastic Strain Ratiorfor Sheet Metal
E 646Test Method for Tensile Strain-Hardening Exponents
(n-Values) of Metallic Sheet Materials
3. Terminology Galvalume ASTM A792
3.1 Definitions—See Terminology A 902 for definitions of
general terminology relating to metallic-coated hot-dip products.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 regular spangle—the unaltered 55 % aluminum-zinc
(Al-Zn) crystal structure that occurs during normal solidification of a hot-dip coated steel sheet.
3.2.2 high temperature steel—a product intended for use in
elevated temperature applications.
4. Classification Galvalume ASTM A792
4.1 The material is available in several designations, as
follows:
4.1.1Commercial Steel—CS Types A, B, and C,
4.1.2Forming Steel—FS,
4.1.3Drawing Steel—DS,
4.1.4High Temperature Steel—HTS, and
4.1.5Structural Steel—SS.
4.2 Structural steel is available in several grades based on
mechanical properties. Structural Steel Grade 50 [340] is available in three classes based on tensile strength. Structural Steel Grade 80 [550] is available in two classes, based on chemistry.
4.3 The product is available in several coating weights

5. Ordering Information
5.1 55 % aluminum-zinc alloy-coated steel sheet in coils
and cut lengths is produced to thickness requirements expressed to 0.001 in. [0.01 mm]. The thickness of the sheet
includes the base metal and the coating.
5.2 Orders for product to this specification shall include the
following information, as necessary, to adequately describe the
desired product.
5.2.1 Name of product (steel sheet, 55 % aluminum-zinc
alloy coated),
5.2.2 Designation of sheet steel {CS (Type A, B, or C), FS,
DS, HTS, or SS}.
5.2.2.1 When a CS type is not specified, Type B will be
furnished.
5.2.3 Strength grade as required for Structural Steel,
5.2.4 ASTM designation number and year of issue, such as
A 792 – for inch-pound units or A 792M – for SI units,
5.2.10 Packaging,
5.2.11 Certification, if required, and heat analysis and mechanical property report,
5.2.12 Application (show part identification and description), and
5.2.13 Special requirements (if any).
5.2.13.1 If required, the product may be ordered to a
specified base metal thickness. See Supplementary Requirement S1.
NOTE 1—Typical ordering descriptions are as follows:
Steel sheet, 55 % aluminum-zinc alloy-coated, Forming Steel (FS),
ASTM A 792 – , coating designation AZ55, chemical treatment, no
oil, minimum 0.035 by 36 in. by coil, 48-in. maximum OD, 24-in. ID,
10 000-lb maximum, for muffler wrappers.
Steel sheet, 55 % aluminum-zinc alloy-coated, Commercial Steel (CS
Type A), ASTM A 792M – , coating designation AZM150, chemical
treatment, no oil, minimum 0.90 by 900 mm by coil, 1200-mm maximum
OD, 600-mm ID, 4500-kg maximum, for building panels.

 II. Mechanical Properties of Aluminum – zinc Alloy – Coated by the Hot Dip process (Galvalume – GL)

Many interrelated factors that affect the ability of a steel to cold form over a given radius under shop conditions. These factors include thickness, strength level, degree of restraint, relationship to rolling direction, chemistry, and base metal micro structure. Lists the suggested minimum inside radii for 90° cold bending for Structural Steels. They presuppose “hard way” bending (bend axis parallel to the rolling direction) and reasonably good shop forming practices. Where possible, the use of larger radii or “easy way” bends are recommended for improved performance.
Fabricators should be aware that cracks may initiate upon bending a sheared or cold-worked edge. This is not considered to be a fault of the steel but is rather a function of the induced localized cold-work zone.

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