Stress 02 percent nmm4 c elongation over a gauge

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Unformatted text preview: s the dia of wire, percent 5 570 480 73 IS : 432 ( Part II) - 1982 7.2 The wire shall withstand the reverse bend test specified in 8.3. 8. TESTS 8.1 All test pieces of wire shall authorized representative, either a) from the cuttings of lengths be selected by the purchaser or his of wires or ends of coils of wires, or b) if he so desires, from the coil or length of wire, after it has been cut to the required or specified length and the test piece taken from any part of it. 8.1.1 In neither case, the test piece shall be detached length of wire, except in the presence of the purchaser representative. from the coil or or his authorised 8.1.2 Before test pieces are selected, the manufacturer or supplier shall furnish the purchaser or his authorized representative with copies of the mill records giving the number of coils or bundles in each cast with sizes as well as the identification marks, whereby each coil or bundle of wire can be identified. 8.2 Tensile Test - The ultimate tensile stress, proof stress and elongation of wire shall be determined in accordance with IS : 1521-1972*. The test pieces shall be cut from the finished material and straightened, where necessary. The test pieces shall not be annealed or otherwise subjected to heat treatment. Any slight straightening which may be required shall be done cold. 8.3 Reverse Bend Test -Reverse bend test shall be made on a test piece cut from the finished product. The test piece shall not be annealed or subjected to any heat treatment before testing. The test piece shall withstand one complete cycle of reverse bend around a pin of size indicated below, without showing any sign of fracture when reverse bend test is carried out in accordance with the reqrlirements of IS : 1716-1971t: Dia of Specittm It’ire Dio of Pin 7.5 mm and under Over 7.5 mm -. *Method thl@thod Equal to diameter of specimen Twice the diameter of specimen for tensile testing of steel wire (fir,~! rcoision ). for revers.e bend testing of steel wire I first rmision ). 6 IS : 432 ( Part II ) - 1982 8.4 Re-tests - Should any one of the test pieces first selected fail to pass any of the tests specified in this standard, two further samples shall be selected for testing in respect of each failure. Should the test pieces from both these additional samples pass, the material represented by the test samples shall be deemed to comply with the requirements of that particular test. Should the test piece from either of these additional samples fail, the material represented by the test sample shall be considered as not having complied with this standard. 8.5 Sampling - One tensile test and one bend for every 5 tonnes or less in any parcel of wire. 9. DELIVERY, INSPECTION AND test each TESTING shall be made FACILITIES 9.1 Unless otherwise specified, general requirements relating to the supply of material, inspection and testin, 17shal! conform to IS : 1387-1967*. 9.2 No material shall be despstched from the manufacturer’s or supplier’s premi...
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This document was uploaded on 10/01/2013.

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