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ASTM B148-2018 pdf free download

ASTM B148-2018 pdf free download.Standard Speci fication for Aluminum-Bronze Sand Castings
1. Scope
1.1 This specification establishes requirements for sand castings produced from copper-base alloys having the alloy numbers, commercial designations, and nominal compositions shown in Table 1. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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.
6. Materials and Manufacture
6.1 Materials: 6.1.1 The material of manufacture shall be sand castings of Copper Alloys, UNS No. C95200, C95300, C95400, C95410, C95500, C95520, C95600, C95700, C95800, C95820, C95900 of such purity and soundness as to be suitable for processing into the products prescribed herein. 6.1.2 When specified in the contract or purchase order, that heat identification or traceability is required, the purchaser shall specify the details desired. 6.2 Manufacture: 6.2.1 As a specified option, Copper Alloy UNS Nos. C95300,C95400, C95410, C95500, and C95520 may be . supplied in the heat-treated condition to obtain the higher mechanical properties shown in Table 2. Suggested heat treatments for these alloys are given in Table 3. Actual practice may vary by manufacturer. 6.2.2 For better corrosion resistance in seawater applications, castings in Copper Alloy UNS No. C95800 may be given a temper anneal heat treatment at 1200 to 1300 °F (650 to 705。C) for 6 h minimum. Cooling shall be by the fastest means possible that will not cause excessive distortion or cracking. Propeller castings shall be exempt from this requirement. 6.2.3 Copper Alloy UNS No. C95520 is used in the heat- treated condition only. 6.2.4 Copper Alloy UNS No. C95900 is normally supplied annealed between 1100 °F (595 °C) and 1300 °F (705 °C) followed by air cooling. 6.2.5 Copper Alloy UNS No. C95820 is supplied in the as- cast condition. 6.2.6 Separately cast test bar coupons representing castings made in Copper Alloy UNS Nos. C95300HT, C95400HT, C954 10HT, C95500HT, C95520HT,C95800 temper annealed, and C95900 annealed shall be heat treated with the castings.
7. Chemical Composition
7.1 The material shall conform to the chemical composition requirements in Table 4 for the copper alloy UNS. No. designation specified in the ordering information. 7.1.1 Results of analysis of the product sample shall con- form to the composition requirements within the permitted analytical variance specified in Table 4. 7.1.2 These composition limits do not preclude the presence of other elements. Limits may be established by agreement between manufacturer or supplier and purchaser for the un- named elements. 7.1.3 For alloys in which Copper is listed as remainder, copper is the difference between the sum of results of all elements determined and 100 %. When all the elements in Table 4 are determined, the sum of results shall be as specified in the following table:9. Mechanical Property Requirements 9.1 Tensile Strength Requirements:
9.1.1 The mechanical properties shall be determined from separately cast test bar castings. 9.1.2 Product furnished under this specification shall con- form to the mechanical properties requirements specified in Table 2, when tested in accordance with Test Methods E8/ E8M. 9.1.3 Acceptance or rejection based upon mechanical prop- erties shall depend on tensile strength, yield strength, and elongation. 9.2 Hardness Requirement: 9.2.1 The approximate Brinell hardness values given in Table 2 are for general information and assistance in testing, and shall not be used as a basis for product rejection.
10. Casting Repair
10.1 Alloys included in this specification are generally weldable. Weld repairs may be made at the manufacturer’s discretion provided each excavation does not exceed 20 % of the casting section or wall thickness or 4 % of the casting surface area.

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