ASME II SA29 pdf download SPECIFICATION FOR STEEL BARS, CARBON AND ALLOY, HOT-WROUGHT, GENERAL REQUIREMENTS FOR
22.214.171.124 Referee Test — In the event that the chemi- cal analysis of columbium or vanadium does not meet the requirements of 126.96.36.199, the grain size test shown in 5.1.2 shall be the referee test unless an alternative test method is agreeduponbetweenthe manufacturerandthe purchaser.
6. Mechanical Property Requirements 6.1 Test Specimens:
6.1.1 Selection — Test specimens shall be selected in accordance with the requirements ofthe applicable product specification or in accordance with Supplement I of the latest issue of Test Methods and Definitions A 370, in the sequence named.
6.1.2 Preparation — Unless otherwise specified in the applicable product specification, test specimens shall be prepared in accordance with the latest issue of Test Methods andDefinitions A 370, andespecially Supplement I thereof.
6.2 Methods of Mechanical Testing — All mechanical tests shall be conducted in accordance with the latest issue of Test Methods and Definitions A 370, and especially Supplement I thereof, on steel bar products.
6.3.1 Ifany testspecimenshows defective machining or develops flaws, the specimen may be discarded and another substituted.
6.3.2 If the percentage elongation of any tension specimen is less than that specified and any part of the fracture is more than 3 ⁄ 4 in. [20 mm] from the center of a 2 in. [50 mm] specimen, or is outside the middle half of the gage length ofan 8 in. [200 mm] specimen as indicated by scribe scratches marked on the specimen before testing, a retest shall be allowed.
6.3.3 For “as-wrought” material, if the results for any originaltension specimen are within 2000 psi [14 MPa] of the required tensile strength, within 1000 psi [7 MPa] of the required yield point, or within 2% of the required elongation, retesting shall be permitted.
Ifthe original testing required only one test, the retest shall consist of two random tests from the heat or lot involved. If the original testing required two tests of which one failed by the amounts listed in this paragraph, the retest shall be made on one random test from the heat or lot. If the results on the retest specimen or specimens meet the specified requirements, the heat or test lot will be accepted. If the results of one retest specimen do not meet the specified requirements, the material is subject to rejection.
6.3.4 For thermally treated bars, if the results of the mechanical tests do not conform to the requirements specified, two more tests may be selected for each bar failing, and each of these retests shall conform to the requirements of the product specification.
6.3.5 If a bend specimen fails, due to conditions of bending more severe than required by the specification, a retest shall be permitted from the heat or test lot involved forwhich one random specimen foreach original specimen showing failure shall be used. If the results on the retest specimen meet the requirements of the specification, the heat or test lot will be accepted.