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This specification covers uncoated, deformed, stress-relieved, and low-relaxation wire for use as prestressed tendons in concrete railroad ties. Deformed wires with nominal diameters shall be supplied in coils and shall conform to specified values of breaking strength requirements. The relaxation losses of normal stress-relieved and low-relaxation stress-relieved wires should not exceed the specified limits. The two acceptable types of deformed wire shall have specific dimensions of deformations, where the depth of indent shall be the average depth of six or more random indents measured at maximum depth. The material shall be tested on and shall conform to specified values of the following mechanical properties: breaking strength, load at 1% extension, elongation, bending, and relaxation.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers uncoated, indented, low-relaxation steel wire for use as prestressing tendons in concrete railroad ties.
1.2 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 standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A421/A421M Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
E328 Test Methods for Stress Relaxation for Materials and Structures
U.S. Military StandardsMIL-STD-129 Marking for Shipment and Storage
U.S. Federal StandardFed.Std.No.123 Marking for Shipment (Civil Agencies)
ICS Number Code 77.140.15 (Steels for reinforcement of concrete)
UNSPSC Code 31152207(Prestressed concrete steel wire)