ASME SA 29-2007 pdf download

ASME SA 29-2007 pdf download.SPECIFICATION FOR STEEL BARS, CARBON AND ALLOY, HOT-WROUGHT AND COLD-FINISHED, GENERAL REQUIREMENTS FOR.
NOTE 1 — Heat analysis for lead is not determinable since lead is added to the ladle stream while each ingot is poured. When specified as an added element to a standard steel, the percentage of lead is reported as 0.15 to 0.35 incl, which is the range commonly specified for this element. 4.2.3 If requested or required, the heat analysis shall be reported to the purchaser or his representative. 4.2.4 Reporting of significant figures and rounding shall be in accordance with Test Methods, Practices, and Terminology A 751. 4.3 Product Analysis: 4.3.1 Merchant quality carbon bar steel is not subject to rejection for product analysis unless misapplication of a heat is clearly indicated. 4.3.2 Analyses may be made by the purchaser from finished bars other than merchant quality representing each heatofopen-hearth, basic-oxygen, orelectric-furnace steel. The chemical composition thus determined shall not vary from the limits specified in the applicable specification by more than the amounts prescribed in Table 5 and Table 6, but the several determinations of any element, excluding lead, in a heat may not vary both above and below the specified range. Rimmed or capped steel is characterized by a lack of homogeneity in its composition, especially for the elements carbon, phosphorus, and sulfur; therefore, when rimmed or capped steel is specified or required, the limitations for these elements shall not be applicable. Because of the degree to which phosphorus and sulfur segregate, the limitations for these elements shall not be applicable to rephosphorized or resulfurized steels. 4.3.3 Samples for product analysis shall be taken by one of the following methods: 4.3.3.1 Applicable to small sections whose cross- sectional area does not exceed 0.75 in. 2 [500 mm 2 ] such as rounds, squares, hexagons, etc. Chips are taken by mill- ing ormachining the full cross section ofthe piece. Drilling is not a feasible method for sampling sizes 0.75 in. 2 2 and smaller. 4.3.3.2 Applicable to products where the width of the cross section greatly exceeds the thickness, such as bar size shapes and light flat bars. Chips are taken by drilling entirely through the steel at a point midway between the edge andthe middle ofthe section, orby milling ormachin- ing the entire cross section. 4.3.3.3 Applicable to large rounds, squares semi- finished, etc. Chips are taken at any point midway between the outside and the center of the piece by drilling parallel to the axis orby milling or machining the full cross section. In cases where these methods are not practicable, the piece may be drilled on the side, but chips are not taken until they represent the portion midway between the outside and the center.
5.1.2.3 When provisions of 5.1.2.1 or 5.1.2.2 are exercised, a grain size test is not required unless specified by the purchaser. Unless otherwise specified, fine austenitic grain size shall be certified using the analysis of grain refining element(s). 5.1.2.4 Referee Test — Inthe eventthatthe chemi- cal analysis of columbium or vanadium does not meet the requirements of 5.1.2.2, 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. 130 6.3 Retests: 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 test- ing 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. 7. Dimensions, Mass, and Permissible Variations 7.1 Hot-WroughtBars — The permissible variations for dimensions ofhot-wrought carbon andalloy steel bars shall not exceed the applicable limits stated in Annex A1 for inch-pound values and Annex A2 for metric values. 7.2 Cold-Finished Bars — The permissible variations for dimensions of cold-finished carbon and alloy steel bars shall not exceed the applicable limits stated in Annex A1 for inch-pound values and Annex A2 for metric values. 8. Workmanship, Finish, and Appearance 8.1 The material shall be free of injurious defects and shall have a workmanlike finish.