This specification covers uncoated, stress-relieved steel bars for prestressed concrete railroad ties. Analysis of the steel shall conform to the chemical requirements specified by the specification. Mechanical requirements including test method, tensile strength, yield strength, elongation and wrapping test are provided. One test specimen each for the tensile test and the wrapping test shall be taken for every 10 coils or fraction thereof in a lot.
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1.1 This specification covers uncoated stress-relieved steel bars for use in prestressed concrete railroad ties.
1.2 A supplementary requirement (S1) is provided for use where low-relaxation bars and relaxation testing for that product is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A911) or in SI units (as Specification A911M).
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standards. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
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
E328 Test Methods for Stress Relaxation for Materials and Structures
MIL-STD-129 Marking for Shipment and Storage
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
low-relaxation bars; prestressed concrete; railroad ties; steel bars, stress-relieved; Uncoated steel; Concrete reinforcement--specifications; Prestressed concrete; Rail steel bars; Steel bars (concrete reinforcement- specifications); Steel wire (prestressed concrete);
ICS Number Code 77.140.15 (Steels for reinforcement of concrete)
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