ASTM A653/A653M-25a PDF

Full title and description

ASTM A653/A653M-25a — Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot‑Dip Process. The specification covers hot‑dip galvanized and galvannealed steel sheet supplied in coils and cut lengths and includes a range of steel designations (commercial, forming, deep‑drawing, structural, HSLA, solution‑hardened, bake‑hardenable, etc.) and coating weight designations; the 25a designation reflects the 2025 revision and subsequent amendment activity.

Abstract

This ASTM specification defines composition, mechanical properties, coating types and coating‑mass designations, product forms (coils and cut lengths), testing requirements (including bend testing of coated sheets), and unit systems (inch‑pound as A653 and SI as A653M) for hot‑dip zinc‑coated and zinc‑iron alloy‑coated steel sheet. It establishes designations, grades, and classes to match varying application requirements and references general coating requirements in Specification A924/A924M.

General information

• Status: Active standard (current edition designated A653/A653M-25a).
• Publication date: Published January 12, 2025; includes amendments/updates through December 5, 2025.
• Publisher: ASTM International.
• ICS / categories: 77.140.50 (Flat steel products and semi‑products).
• Edition / version: A653/A653M-25a (2025 revision, “25a”).
• Number of pages: 15 pages (published form).

Key bibliographic details (publisher, dates, page count and ICS) are recorded in the ASTM bibliographic entry for A653/A653M-25a.

Scope

The specification applies to steel sheet that is zinc‑coated (galvanized) or zinc‑iron alloy‑coated (galvannealed) by the hot‑dip process, furnished in coils and cut lengths. It covers multiple coating weights (masses) and coating designations, and a range of steel designations and grades (commercial, forming, deep drawing, extra deep drawing, structural grades, high‑strength low‑alloy, solution‑hardened, and bake‑hardenable steels). Orders may specify inch‑pound units (A653) or SI units (A653M); when the “M” designation is not specified the product is furnished in inch‑pound units. Product furnished under this specification shall conform to applicable requirements of Specification A924/A924M unless otherwise specified.

Key topics and requirements

• Coating types: zinc (galvanized) and zinc‑iron alloy (galvannealed) produced by hot‑dip processes, with defined coating‑mass (weight) designations and options for spangle/minimized‑spangle or spangle‑free finishes.
• Steel designations and grades: commercial steel, forming steel, drawing steels (deep and extra deep), structural steels (SS grades), HSLA, solution‑hardened, and bake‑hardenable steels with defined chemical and mechanical requirements.
• Mechanical property requirements: yield strength, tensile strength, elongation and bending properties required for the relevant grades; coated sheets require bend testing to demonstrate formability and coating integrity.
• Chemistry and mandatory properties: several categories in the specification impose mandatory chemical composition and either typical or mandatory mechanical-property limits depending on designation/grade/class.
• Units and presentation: dual publication in inch‑pound (A653) and SI units (A653M); the two unit systems are independent and values are not necessarily equivalent.
• Reference requirements: product must meet applicable general coating requirements in A924/A924M (general requirements for metallic‑coated sheet by hot‑dip).
• Recent/ongoing revisions: the 2025 revision (25a) includes editorial and technical updates; work items have been recorded to add or clarify structural grades (for example, addition of a structural SS 100 [690] grade and clarifications on classes).

Typical use and users

Primary users are steel producers and coil coaters, metal service centers, fabricators, construction specifiers, roofing and cladding manufacturers, appliance and light‑vehicle component manufacturers, design engineers, and quality/inspection laboratories. The standard is used to specify requirements for galvanized/galvannealed sheet intended for exterior building products, formed parts, structural elements, and general corrosion‑resistant sheet applications.

Related standards

Commonly referenced or associated standards include ASTM A924/A924M (general requirements for metallic‑coated steel sheet by the hot‑dip process), ASTM A1008/A1008M (cold‑rolled steel sheet specifications for related base steel grades), ASTM A792/A792M (55% aluminum‑zinc alloy‑coated sheet), ASTM A755/A755M (metallic coated and prepainted coil‑coated exterior building products), and ASTM A780/A780M (repair of damaged/damaged hot‑dip galvanized coatings). These related documents are frequently cited in procurement and product acceptance clauses.

Keywords

galvanized, galvannealed, hot‑dip, zinc‑coated, zinc‑iron alloy, coated steel sheet, coating mass, spangle, SS grades, HSLA, bake‑hardenable, coil, cut lengths, A653, A653M.

FAQ

Q: What is this standard?

A: ASTM A653/A653M-25a is the ASTM International specification that defines requirements for hot‑dip zinc‑coated (galvanized) and zinc‑iron alloy‑coated (galvannealed) steel sheet produced in coils and cut lengths.

Q: What does it cover?

A: It covers coating types and coating‑mass designations, steel designations and grades (commercial, forming, drawing, structural, HSLA, solution‑hardened, bake‑hardenable), mechanical and chemical requirements, bend testing of coated sheets, unit systems (A653 vs A653M), and references to general coating requirements (A924/A924M).

Q: Who typically uses it?

A: Steel mills, coil coaters, metal service centers, product manufacturers (roofing, cladding, appliances, automotive), specifiers and design engineers, and QA/test laboratories use this standard to specify and verify coated steel sheet.

Q: Is it current or superseded?

A: The A653/A653M-25a edition is the current active edition (2025 revision) as published by ASTM International, with recorded amendment activity through December 5, 2025. Check ASTM International or your national standards reseller for any subsequent amendments or corrigenda after that date.

Q: Is it part of a series?

A: Yes — A653/A653M is part of the family of ASTM hot‑dip metallic coated sheet standards (for example A792, A875, A1046, A1003, and the general requirements A924/A924M) and is developed by ASTM Committee A05 (steel, sheet and strip).

Q: What are the key keywords?

A: Key keywords include galvanized, galvannealed, zinc‑coated, zinc‑iron alloy, hot‑dip, coated steel sheet, coating‑mass, spangle, structural steel grades (SS), HSLA, bake‑hardenable, coil, and cut lengths.