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 five grades covered are: utilities; common; Siemens-Martin; high-strength; and extra high-strength. The four weights covered here are Classes 1, A, B, and C. The base metal shall be steel made by any commercially accepted steel making process. The bath metal used in continuous hot-dip Zn-5 Al-MM alloy-coating shall meet the chemical composition limits specified. The determination of chemical composition shall be made in accordance to the required specifications. Breaking strength test, elongation test, and ductility test shall be made to conform to the requirements specified.
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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 7.
1.3 The four weights of coatings are: Class1 and Classes A, B, and C. Minimum weights of Zn-5 Al-MM alloy are described in Section 10.
1.4 This specification is applicable to orders in either inch-pound units (as A 855) or acceptable SI units (as A 855M). 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
GF-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.
steel-wire strand; wire; zinc-5 % aluminum-mischmetal alloy coated steel wire strand
; Aluminum alloys (wire)--specifications; Carbon steel wire--specifications; Mischmetal alloy-coated steel wire--specifications; Steel wire strand--specifications; Zinc alloys--specifications; Zinc-aluminum-mischmetal alloy (Zn-Al-MM); Zinc-coated steel wire--specifications;
ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)
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