Home>ASTM Standards>ASTM B21B21M-2019 pdf free download

ASTM B21B21M-2019 pdf free download

ASTM B21B21M-2019 pdf free download.Standard Specification for Naval Brass Rod, Bar, and Shapes
1. Scope
1.1 This specification establishes the requirements for naval brass rod, bar, and shapes produced from Copper Alloy UNS Nos. C46200, C46400, C46750, C47940, C48200, C48500, or C48640. 1.1.1 For piston-finish rod or shafting refer to the Other Requirements Section. 1.1.2 For hot forging material, refer to Specification B124/ B124M. 1.2 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other and values from the two systems shall not be combined. 1.3 Warning—Mercury is a definite health hazard in use and disposal (see Performance Requirements). 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Ordering Information
4.1 Include the following specified choices when placing orders for product under this specification, as applicable: 4.1.1 ASTM designation and year of issue; 4.1.2 Copper Alloy UNS No. designation (Scope); 4.1.3 Temper (Temper Section and related Tables); 4.1.4 Form—cross-section such as round, hexagonal, square, and so forth; 4.1.5 Diameter or distance between parallel surfaces, width and thickness (Dimensions and Permissible Variations); 4.1.6 Length (Dimensions and Permissible Variations); 4.1.7 Edge contours (Dimensions and Permissible Varia- tions); 4.1.8 Quantity—number of pieces or total weight, for each size and form; and 4.1.9 Intended application. 4.2 The following options are available, but may not be included, unless specified at the time of placing of the order when required: 4.2.1 Tensile test for product 1 ⁄ 2 in. [12 mm] and over, for the alloys and tempers listed in Table 4; 4.2.2 Residual stress test (Performance Requirements sec- tion); 4.2.3 Piston finish rod or shafting (Other Requirements section); 4.2.4 Certification (Specification B249/B249M); 4.2.5 Mill test report (Specification B249/B249M); 4.2.6 Heat identification or traceability details (Specifica- tion B249/B249M); and 4.2.7 If product is purchased for agencies of the U.S. Government (Other Requirements—Purchases for U.S. Gov- ernment).
5. Chemical Composition
5.1 The material shall conform to the chemical composition requirements specified in Table 1 for the Copper Alloy UNS No. designation specified in the ordering information. 5.2 These composition limits do not preclude the presence of other elements. Limits may be established and analysis required for unnamed elements by agreement between the manufacturer or supplier and purchaser. 5.3 For alloys in which zinc is listed as the “remainder,” either copper or zinc may be taken as the difference between the sum of the results of all other elements determined and 100 %. When copper is so determined, that difference value shall conform to the requirements given in Table 1. 5.4 When all the elements listed in Table 1 for the Copper Alloy No. are determined, the sum of the results shall be 99.6 % minimum except for C46750 and C48640, which shall be 99.5 % minimum.
7. Mechanical Property Requirements
7.1 Product furnished under this specification shall conform to the mechanical property requirements prescribed in Tables 2-4. 7.1.1 Rockwell Hardness Requirements—For the alloys and tempers listed, the product 1 ⁄ 2 in. [12 mm] and over in diameter or distance between parallel surfaces should conform with the requirements prescribed in Table 4, when tested in accordance with Test Methods E18. For the alloys, tempers, and sizes listed in Table 4, Rockwell hardness may be used as the basis of acceptance or rejection for mechanical properties except when the tensile test is specified in the contract or purchase order. Hardness test results outside the ranges of Table 4 shall not be cause for rejection if the tensile property require- ments of Tables 2 and 3 are met.

Maybe you like

Standards Tags