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1.1 This specification covers five grades of zinc-5% aluminum-mischmetal (Zn-5 Al-MM) alloy-coated, steel wire strand, composed of a number of round, steel wires, with four weights of Zn-5 Al-MM alloy coatings, suitable for use as guys, messengers, span wires, and for similar purposes. The product is intended for applications requiring corrosion resistance and formability.
1.2 The five grades covered are as follows:
1.2.4 High-strength, and
1.2.5 Extra high-strength,
1.2.6 Minimum breaking strengths of strand for each grade are described in Section 8.
1.3 The four weights of coatings are: Type 1 and Classes A, B, and C. Minimum weights of Zn-5 Al-MM alloy are described in Section 12.
1.4 This specification is applicable to orders in either inch-pound units (as A855) or acceptable SI units (as A855M). Inch-pound units and SI units are not necessarily equivalent.
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
B750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
E1277 Test Method for Chemical Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry
Other StandardGF-1 Standard Practice for Determination of Cerium and Lanthanum Compositions in Galfan Alloy (5-Al-0.04 % La-0.04 % Ce-Bal SHG Zn) Available from International Lead Zinc Research Organization, 2525 Meridian Parkway, P.O. Box 12036, Research Triangle Park, NC 27709-2036.
ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)