ASME II SA29- 2010 pdf download

ASME II SA29- 2010 pdf download.SPECIFICATION FOR STEEL BARS, CARBON AND ALLOY, HOT-WROUGHT, GENERAL REQUIREMENTS FOR.
4. Chemical Composition 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 1 and 2. Bars may be ordered to these grade 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 1 and 2 are required, the composition limits shall be prepared using the ranges and limits shown in Table 3 for carbon steel and Table 4 for alloy steel. 4.2 Heat or Cast 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 pur- chase order. These can be the heat chemical range and limit for a grade designated in Tables 1 and 2, or another range and limit in accordance with 4.1.2, or with require- ments of the product specification. NOTE 2 — 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. 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, and the like. Chips are taken by milling or machining the full cross section of the piece. Drilling is notafeasible methodforsampling 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 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. 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 forproduct analysis can be taken by drilling entirely through the tension test specimens or by the method described in 4.3.3.1.
5. Grain Size Requirement 5.1 Austenitic Grain Size: 5.1.1 When a coarse austenitic grain size is specified, the steel shall have a grain size number of 1 to 5 exclusive as determined in accordance with Test Methods E 112. Conformance to this grain size of 70% of the grains in the area examined shall constitute the basis ofacceptance. One test per heat shall be made. 5.1.2 When a fine austenitic grain size is specified, the steel shall have a grain size number of 5 or higher as determined in accordance with Test Methods E 112. Conformance to this grain size of70% ofthe areaexamined shall constitute the basis of acceptance. One test per heat shall be made unless the provisions of 5.1.2.1 or 5.1.2.2 are exercised. 5.1.2.1 When aluminum is used as the grain refin- ing element, the fine austenitic grain size requirement shall be deemed to be fulfilled if, on heat analysis, the aluminum content is not less than 0.020% total aluminum or, alter- nately, 0.015% acid soluble aluminum. The aluminum con- tent shall be reported. The grain size test specified in 5.1.2 shall be the referee test.