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ASTM A421/A421M-10

Historical Revision

Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete

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1.1 This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction, as follows:

1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and

1.1.2 Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire is involved (Wedge Anchorage).

1.2 A supplementary requirement (S1) is provided for use where low-relaxation wire and relaxation testing for that product is required by the purchaser. The supplementary requirement applies only when specified in the purchase order.

1.3 This specification is applicable for orders in either inch-pounds units (as Specification A421) or in SI units (as Specification A421M).

1.4 The values stated in either inch-pound or 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.


This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction. These two types are the type BA used for applications in which cold-end deformation is used for anchoring purposes and type WA wire which is used for application in which the ends are anchored by wedges, no cold-end deformation of the wire is involved. Required tensile strength, yield strength and elongation shall be evaluated using stress-relaxation test. Heat analysis shall be used to determine the percentage of specified elements especially sulfur and phosphorus to meet the required chemical composition.


SDO ASTM: ASTM International
Document Number A421
Publication Date Nov. 1, 2010
Language en - English
Page Count 4
Revision Level 10
Supercedes
Committee A01.05
Publish Date Document Id Type View
May 1, 2021 A0421_A0421M-21 Revision
Nov. 1, 2015 A0421_A0421M-15 Revision
Nov. 1, 2010 A0421_A0421M-10 Revision
March 1, 2005 A0421_A0421M-05 Revision
Sept. 10, 2002 A0421_A0421M-02 Revision
Sept. 10, 1998 A0421_A0421M-98A Revision