AASHTO M204:2014 Standard Specification for Uncoated Stress- Relieved Steel Wire for Prestressed Concrete.
5.3. Elongation—The total elongation under load of all wire shall not be less than 4 percent when measured in a gauge length of 250 mm [10 in.].
The elongation shall be determined by an extensometer which is placed on the test specimen after a load corresponding to the initial stress prescribed in Table 2 is applied. If the fracture takes place outside of the gauge length and the elongation so measured meets the minimum requirements, no further testing shall be required. If the elongation is less than the minimum requirements, the test shall be considered an invalid test and a retest made.
6. DLMETER AND PERMISSIBLE VARIATIONS
6.1. Wire meeting the requirements of this specification is normally ordered in the diameters shown in Table 1.
6.2. The diameter of the wire shall not vary from the nominal diameter specified by more than
±0.05 mm [±0.002 in.].
6.3. The wire shall not be out-of-round by more than 0.05 mm [0.002 in.].
7. WORKMANSHIP AND FINISH
7.1. cast—A wire sample having a chord length of 1524 mm [60 in.] shall have an offset at the center of the chord of not more than 76 mm [3 in.]. This is equivalent to a chord of an arc of a circle not less than 7.6 m [25 if] in diameter.
7.2. Tipc’ BA Wire—Type BA wire shall be of suitable quality to permit cold forming of buttons for anchorage. Splitting shall not be considered a cause for rejection if the button anchorage is capable of developing the minimum required tensile strength of the wire.
7.3. The wire shall be tree of kinks.
7.4. The wire shall be furnished in firmly tied coils having a minimum inside diameter of 1219 mm [48 in.]. Each coil shall be of one continuous length.
7.5. There shall be no welds or joints in the finished wire. Any welds or joints made during manufacture to promote continuity of operations shall be removed.
7.6. The wire shall not be oiled or greased. Slight rusting, provided it is not sufficient to cause pits visible to a person with normal or corrected vision, shall not be cause for rejection.
7.7. Temper colors, which may result from the stress-relieving operations, are considered normal for the finished appearance of this strand.AASHTO M204 pdf download.