A421/A421M–21 Highvmay Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete

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Designation: A421/A421M - 21 Highvmay Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete11. Scope1.1 This specification covers two types of stress-relievedround high-carbon steel wire used in prestressed concreteconstruction, as follows:1.1.1 Type BAwire is used for applications in whichcold-cnd deformation is used for anchoring purposes(ButtonAnchorage), and1.1.2 Type WA wire is uscd for application in which the endsare anchored by wedges, and no cold-end deformation of thewire is involved ( Wedge Anchorage).1.2 A supplementary requirement (Sl) is provided for usewhere low-relaxation wire and relaxation testing for thatproduct is required by the purchaser.The supplementaryrequirement applies only when specified in the purchase orderor contract.1.3 This specification is applicable for orders in eitherinch-pounds units (as Specification A421y or in Sl units (asSpecification A421M).1.4 The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the Sl unitsare shown in brackets.The values stated in each system maynot be exact equivalents:; therefore, each system shall be usedindependently of the other. Comb

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