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This specification covers steel sheet, in coils and cut lengths, metallic-coated by the hot-dip process, with zinc-aluminum alloy coating. The coating is produced as two types: zinc-aluminum-mischmetal alloy (Type I) and zinc-aluminum-magnesium alloy (Type II), and in two coating structures. Coated sheet is produced in several coating designations (coating weight [mass]). Material is classified in terms of the base metal and in terms of the coating. Base metal material classification is as follows: commercial steel (CS Types A, B, and C), forming steel (FS Types A and B), deep drawing steel (DDS), extra deep drawing steel (EDDS), structural steel (SS), high-strength low-alloy steel (HSLAS), and high-strength low-alloy steel with improved formability (HSLAS-F). Structural steel and high strength low alloy steel are available in several grades based on mechanical properties. Structural steel grade 50  is available in three classes based on tensile strength. Heat analysis of the base metal for CS , FS, DDS, and EDDS shall conform to the chemical composition requirements in carbon, manganese, phosphorus, sulfur, aluminum, copper, nickel, chromium, molybdenum, vanadium, titanium, nitrogen, and boron and chemical composition in carbon, manganese, phosphorus, sulfur, copper, nickel, chromium, molybdenum, vanadium, titanium, nitrogen for SS, HSLAS, and HSLAS-F. Structural steel shall conform to the required yield strength, tensile strength, and elongation. Coating shall conform to the coating weight according to triple-spot test and single-spot test and shall be capable of bending without flaking.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers steel sheet, in coils and cut lengths, metallic-coated by the hot-dip process, with zinc-5 % aluminum alloy coating. The Zn-5Al alloy coating also contains small amounts of elements other than zinc and aluminum that are intended to improve processing and the characteristics of the coated product.
1.2 The coating is produced as two types: zinc-5 % aluminum-mischmetal alloy (Type I) and zinc-5 % aluminum-0.1 % magnesium alloy (Type II), and in two coating structures (classes). The coated sheet is produced in several coating designations (coating weight [mass]).
1.3 The material is intended for applications requiring corrosion resistance, formability, and paintability.
1.4 The steel sheet is produced in a number of designations, types, grades, and classes designed to be compatible with differing application requirements.
1.5 Coated sheet material furnished under this specification shall conform to the applicable requirements of the latest issue of Specification , unless otherwise provided herein.
1.6 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes, excluding tables and figures, shall not be considered as requirements of this specification.
1.7 This specification is applicable to orders in either inch-pound units (as A875) or metric (SI) units [as A875M]. Values in inch-pound and SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents. Therefore, each system shall be used independently of the other.
1.8 Unless the order specifies the “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.9 This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
A902 Terminology Relating to Metallic Coated Steel Products
A924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process
B750 Specification for GALFAN (Zinc-5% Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings,
E47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys
E517 Test Method for Plastic Strain Ratio r for Sheet Metal
E646 Test Method for Tensile Strain-Hardening Exponents (n -Values) of Metallic Sheet Materials
E1277 Test Method for Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry
ISO StandardISO14788 Continuous Hot-Dip Zinc-5% Aluminum Alloy Coated Steel Sheet and Coils
ICS Number Code 77.140.50 (Flat steel products and semi-products)
UNSPSC Code 30264000(Carbon steel sheets)
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ASTM A875 / A875M-13(2021), Standard Specification for Steel Sheet, Zinc-5 % Aluminum Alloy-Coated by the Hot-Dip Process, ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top