ASTM B770-2008 Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications.pdf
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1、Designation: B 770 08Standard Specification forCopper-Beryllium Alloy Sand Castings for GeneralApplications1This standard is issued under the fixed designation B 770; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification establishes requirem
3、ents for copper-beryllium alloy sand castings for general applications andnominal compositions alloys defined by this specification areshown in Table 1.21.2 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathematical conversions to SI uni
4、ts that are provided forinformation only and are not considered standard.1.3 The following safety hazard caveat pertains only to thetest methods described in this specification: This standard doesnot purport to address all of the safety concerns, if any,associated with its use. It is the responsibil
5、ity of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory requirementsprior to use.2. Referenced Documents2.1 The following documents in the current issue of theBook of Standards form a part of this specification to the extentre
6、ferenced herein:2.2 ASTM Standards:3B30 Specification for Copper Alloys in Ingot FormB 208 Practice for Preparing Tension Test Specimens forCopper Alloy Sand, Permanent Mold, Centrifugal, andContinuous CastingsB 601 Classification for Temper Designations for Copperand Copper AlloysWrought and CastB
7、824 Specification for General Requirements for CopperAlloy CastingsB 846 Terminology for Copper and Copper AlloysE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)3. General Requirements3.1 The following sections of Specification B 824 constitutea part of this specif
8、ication:3.1.1 Terminology,3.1.2 Material and Manufacture,3.1.3 Chemical Composition,3.1.4 Dimensions and Permissible Variations,3.1.5 Workmanship, Finish and Appearance,3.1.6 Sampling,3.1.7 Number of Tests and Retests,3.1.8 Specimen Preparation,3.1.9 Test Methods,3.1.10 Significance of of Numerical
9、Limits,3.1.11 Inspection,3.1.12 Rejection and Rehearing,3.1.13 Certification,3.1.14 Mill Test Report, and3.1.15 Packaging and Package Marking.3.2 In addition, when a section with a title identical to thatreferenced in 3.1 appears in this specification, it containsadditional requirements which supple
10、ment those appearing inSpecification B 824.4. Terminology4.1 For definitions of terms relating to copper and copperalloys, refer to Terminology B 846.5. Ordering Information5.1 Include the following information for orders for prod-uct:5.1.1 ASTM designation number, title, and year of issue,1This spe
11、cification is under the jurisdiction ofASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.05 onCastings and Ingots for Remelting.Current edition approved April 1, 2008. Published April 2008. Originallyapproved in 1987. Last previous edition approved in
12、 2005 as B 770 05.2The UNS system for copper and copper alloys (see Practice E 527) is a simpleexpansion of the former standard designation system accomplished by the additionof a prefix “C” and a suffix “00”. The suffix can be used to accommodatecomposition variations of the base alloy.3For referen
13、ced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyri
14、ght ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.2 Copper Alloy UNS Number designation,5.1.3 Temper,5.1.4 Quantity of castings required,5.1.5 Pattern or drawing number, and condition (cast, ma-chined, and so forth),5.1.6 When material is
15、 purchased for agencies of the U.S.government, the Supplementary Requirements of SpecificationB 824 may be specified.5.2 The following options are available and should bespecified in the contract or purchase order when required.5.2.1 Chemical analysis of residual elements, if specified inthe purchas
16、e order (Specification B 824),5.2.2 Mechanical requirements, if specified in the purchaseorder (Section 10),5.2.3 Pressure test requirements, if specified in the purchaseorder (Specification B 824),5.2.4 Soundness requirements, if specified in the purchaseorder (Specification B 824),5.2.5 Repair of
17、castings (Section 12),5.2.6 Certification, if specified in the purchase order (Speci-fication B 824),5.2.7 Foundry test report, if specified in the purchase order(Specification B 824),5.2.8 Witness inspection, if specified in the purchase order(Specification B 824), and5.2.9 Product marking, if spec
18、ified in the purchase order(Specification B 824).6. Materials and Manufacture6.1 MaterialThe material of manufacture shall be cast-ings of the copper alloys listed in Table 1, as specified in thepurchase order or contract, and of such purity and soundness asto be suitable for the products prescribed
19、 herein.6.2 ManufactureThe product shall be manufactured bycasting and thermal treatment to meet the properties specified.7. Chemical Composition7.1 The castings shall conform to the chemical compositionrequirements prescribed in Table 2 for the Copper Alloy UNSNumber designations specified in the o
20、rdering information.7.2 These composition limits do not preclude the presenceof other elements. Limits may be established for unnamedelements by agreement between manufacturer or supplier andpurchaser.7.3 Copper is customarily given as remainder but may betaken as the difference between the sum of a
21、ll elementsanalyzed and 100 %.7.4 When all elements in Table 2 are analyzed, their sumshall be 99.5 % minimum.7.5 It is recognized that residual elements may be present incast copper-base alloys. Analysis shall be made for residualelements only when specified in the purchase order (Specifi-cation B
22、824).8. Temper8.1 The standard tempers are listed as follows:8.1.1 TF00Cast, solution heat treated and precipitationheat treated.8.1.2 M01As sand cast.8.1.3 Special or non-standard tempers are subject to nego-tiation between the supplier and purchaser. Standard temperdesignations are in accordance w
23、ith Classification B 601.9. Precipitation Heat Treatment9.1 For the purpose of determining conformance to theappropriate requirement in Table 3, the castings and testspecimens shall be precipitation heat-treated at a uniformtemperature from the solution heat-treated condition. Solutionheat-treatment
24、 and precipitation heat-treatments are listed inTable 4. Other treatment times and temperatures may bepreferable for end products made from this material.9.2 Special combinations of properties such as increasedductility, electrical conductivity, dimensional accuracy, andendurance life may be obtaine
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