ASME II SA29-2010 pdf free download.SPECIFICATION FOR STEEL BARS,CARBON AND ALLOY, HOT-WROUGHT,
GENERAL REQUIREMENTS FOR.
4.1 Limits:
4.1.1 The chemical composition shall conform to the requirements specified in the purchase order or the individual product specifications. For convenience the grades commonly specified for carbon steel bars are shown in Tables I and 2. Bars may be ordered to these gradc designations and when so ordered shall conform to the specified limits by heat analysis.
4.1.2 When compositions other than those shown in Tables I and 2 arc required. the composition limits shall he prepared using the ranges and limits shown in Table 3 for carbon steel and Table 4 for alloy steel.
4.2 Heat or (‘art Analysis:
4.2.1 The chemical composition of each heat or cast shall be determined by the manufacturer in accordance with Test Methods. Practices, and Terminology A 751.
4.2.2 The heat or cast analysis shall conform to the requirements specified in the product specification or purchase order. These can be the heat chemical range and limit for a grade designated in Tables I and 2. or another range and limit in accordance with 4.1.2. or with requirements of the product specification.
NOTE 2— Heat anajy sis fat lead is not &tcrminablc since lead is added to the ladle stnam while each ingot is poured. When specified as an added clement to a siandatd steel, the pcfccnlage of lead is repotled as 0.15 to 0. 35 md. sshwh is the rante commonly specified fat this ckinen
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 Prothwt Analv sir:
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 heat of open-hearth. basic-oxygen. or electric-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 shalt not be applicable. Because of the degree to which phosphorus and sulfur segregate. the limitations for these elements shall not be applicable to rephosphonzcd or rcsulfurizcd 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 I,.2 1500 mm2l such as rounds, squares, hexagons, and the like. Chips are taken by milling or machining the full cross section of the piece. Drilling is not a kasiblc method for sampling sizes 0.75 in.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 arc taken by drilling entirely through the steel at a point midway between the edge and the middle of the section. or by milling or machining the entire cross section.
4.3.3.3 Applicable to large rounds, squares semifinished. etc. Chips are taken at any point midway between the outside and the ccntcr of the piece by drilling parallel to the axis or by 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.
4.3.3.4 When the steel is subject to tension test requirements. the tension test specimen can also be used for product analysis. In that case, chips for product analysis can be taken by drilling entirely through the tension test specimens or by the method described in 4.3.3.1.