ASTM A648-2018 pdf free download
ASTM A648-2018 pdf free download.Standard Specification for Steel Wire, Hard-Drawn for Prestressed Concrete Pipe
1. Scope
1.1 This specification covers two classes of uncoated, high- strength, hard-drawn steel wire for use in the manufacture of prestressed concrete pipe. In application, the wire is helically wrapped on the pipe maintaining tension by mechanical means not including drawing dies. 1.2 A supplementary requirement (S1) is provided for use where hydrogen embrittlement (HE) resistance testing is re- quired by the purchaser. Supplementary requirement (S1), which establishes acceptance criteria for HE resistance testing, applies only when specified in the purchase order or contract. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 The following caveat pertains only to the test method portions of this specification, 6.3.3 and 6.5.3: This standard does not purport to address all ofthe safety concerns, ifany, associated with its use. It is the responsibility ofthe user ofthis standard to establish appropriate safety, health, and environ- mental practices and determine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Manufacture and Chemical Requirements
5.1 The steel shall be made by any commercially accepted process.5.2 The steel shall be free of injurious piping and undue segregation. 5.3 The wire shall be cold drawn to produce the prescribed mechanical properties. The wire manufacturer shall take de- pendable precautions during wire drawing to preclude detri- mental strain aging of the wire. N OTE 1—Allowing wire to remain at elevated temperatures, such as 400°F (204°C) for more than 5 s or 360°F (182°C) for more than 20 s, can result in detrimental strain aging of the wire. Detrimentally strain-aged wire typically has reduced ductility and increased susceptibility to hydrogen embrittlement. 5.4 There shall be no welds or joints in the finished wire. Any welds or joints made during manufacture to enable continuity of operations shall be removed. 5.5 Chemical Requirements: 5.5.1 The heat analysis of the steel shall conform to the chemical requirements specified in Table 2. 5.5.2 An analysis of each heat of steel shall be furnished by the manufacturer showing the percentages of all the elements specified in Table 2. The wire shall be subject to permissible variation for product analysis specified in Specification A510, Table 7.
6. Mechanical Property Requirements
6.1 Mechanical property requirements are applicable only prior to or during pipe manufacture. 6.2 Test Specimens—It shall be permissible to take wire specimens for tensile and torsion tests from either end ofa coil. Wire test specimens shall be representative of that coil’s wire drawing conditions with regard to wire temperature. 6.3 Tension Test: 6.3.1 Tensile Requirements—Tensile requirements shall conform to those prescribed in Table 1 for the specified size and class. 6.3.2 Number of Tests—One test specimen shall be taken from each coil. 6.3.3 Test Method—Tension tests shall be made in accor- dance with Test Methods and Definitions A370, Annex A4. Tension test reports shall include the coil number tested, the measured wire diameter, and the measured breaking strength. 6.3.4 Reduction-of-Area Test—The reduction of area re- quirement for the specimens used for the tension test in 6.2 shall be a minimum of 35 % for 0.192 in. (4.88 mm) wire and 30 % for larger wire as described and tested in accordance with Test Methods and Definitions A370, Annex A4.
