432_2

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Unformatted text preview: percentage of the original gauge length of a standard test piece. quantity of finished ‘ wire ’ whether in ‘ coils ’ or 2.4 Parcel -Any ‘ bundles ’ presented for examination and test at any one time. 2.5 Proof Stress -The load, a non-proportional original gauge length. stress which is just sufficient elongation equal to a specified to produce, percentage under of the 2.6 Ultimate Tensile Stress - The maximum load reached in a tensile test divided by the original cross-sectional area of the gauge length portion of the test piece. 2.7 Wire -. Cold-drawn 3. MANUFACTURE steel wire of circular AND CHEMICAL cross section. COMPOSITION 3.1 The wire shall be cold-drawn from mild steel made by the open hearth, electric duplex, acid bessemer, basic oxygen, or a combination of these processes. In case any other process is employed in the manufacture of steel, prior approval of the purchaser should be obtained. In case basic oxygen process is employed for manufacture, the nitrogen content of the steel shall not exceed 0.008 percent. 3.1.1 The ladle analysis when made in accordance with relevant parts of IS : 228* shall show that the steel contains not more than O-050 percent of sulphur and not more than 0,050 percent of phosphorus. *Methods for chemical analysis of steels ( sucmd reuisi~n ( being issued in parts ). ) 4 IS : 432 ( Part II) - 1982 4. FREEDOM FROM DEFECTS 4.1 All finished wire, subject to the provisions of 7 shall be cleanly drawn to the specified size and shall be sound, free from splits, surface flaws and other defects likely to impair its use for concrete reinforcement, and finished in a workmanlike manner. 5. NOMINAL SIZES 5.1 Hard-drawn Diameters wire shall be supplied of hard-drawn in the following wire nominal sizes: 2.65, 3.0, 3.15, 3.55, 4.0, 4.5, 4.75, 5.0, 5.3, 5.6, 6.0 6.3, 7.1, 7.5, 8.0, 9.0, 9.5 and 10 mm NOTE- It is proposed to rationalize the diameters of hard-drawn wire and include only 3,4, 5,6. 8 and 10 mm in the next revision of the standard. Sizes other than these are now included to facilitate manufacturers and users to chance over to the rarionalized sizes in this period. 6. TOLERANCES 6.1 The tolerance on the nominal diameter shall be + : percent. 6.1.1 For purposes of determining whether the actual diameter of the wire is within the specified tolerances, the diameter shall be determined with a micrometer by taking two measurements at right angles to each other at three places along a length of not less than 250 mm and the average of these six measurements shall be taken as the diameter of the wire. 6.2 Cutting Tolerances be as follows: on Length - Over 3 m Less than 3 m 7. PHYSICAL Cutting tolerance for wire shall f13mm f 6mm REQUIREMENTS 7.1 The ultimate tensile stress, proof stress and elongation of the wire when tested in accordance with 8.2 shall not be less than the following values: a) Ultimate tensile stress, N/mm? b) Proof stress (0.2 percent ), N/mm4 c) Elongation over a gauge length of 8 D, where D i...
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This document was uploaded on 10/01/2013.

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