Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete
|Publication Date:||1 March 2016|
|ICS Code (Steels for reinforcement of concrete):||77.140.15|
This specification covers two grades of low-relaxation, seven-wire steel strand for use in prestressed concrete construction. Grade 250  and Grade 270  have minimum tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa], respectively, based on the nominal area of the strand.
A supplementary requirement (S1) is provided for use where bond strength testing of 0.600-in. [15.24-mm] diameter Grade 270  strand for applications in prestressed ground anchors is required by the purchaser. The supplementary requirement applies only when specified in the purchase order.
The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes do not contain any mandatory information.
This specification is applicable for orders in either inch-pound units (as Specification A416) or in SI units (as Specification A416M).
The values stated in either inch-pound units 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 specification.
*A Summary of Changes section appears at the end of this standard