1、Designation: B 955/B 955M 08Standard Specification forAluminum-Alloy Centrifugal Castings1This standard is issued under the fixed designation B 955/B 955M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers aluminum-alloy centrifugalcastings designated as shown in Table 1.1.2 This specification is not intended f
3、or aluminum-alloycentrifugal castings used in aerospace applications.1.3 Alloy and temper designations are in accordance withANSI H35.1 / H35.1 (M). The equivalent unified numberingsystem alloy designations are in accordance with PracticeE 527.1.4 Unless the order specifies the “M” specification des
4、ig-nation, the material shall be furnished to the inch-pound units.1.5 For acceptance criteria for inclusion of new aluminumand aluminum alloys and their properties in this specification,see Annex A1 and Annex A2.1.6 UnitsThe values stated in either SI units or inch-pound units are to be regarded se
5、parately as standard. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.7 This standard does not purport to address all of thesafety conc
6、erns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitation prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on thedat
7、e of casting purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B 179 Specification for Aluminum Alloys in Ingot andMolten Forms for Castings from All Casting ProcessesB 275 Practice for Codification of Certain Nonferrous Met-als and Alloys, Cast and Wrough
8、tB 557 Test Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy ProductsB 557M Test Methods for Tension Testing Wrought andCast Aluminum- and Magnesium-Alloy Products (Metric)B 660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB 881 Terminology Relating to Al
9、uminum- andMagnesium-Alloy ProductsB 917/B 917M Practice for Heat Treatment of Aluminum-Alloy Castings from All ProcessesD 3951 Practice for Commercial PackagingE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE34 Test Methods for ChemicalAnalysis ofA
10、luminum andAluminum-Base AlloysE94 Guide for Radiographic ExaminationE 155 Reference Radiographs for Inspection of Aluminumand Magnesium CastingsE 165 Test Method for Liquid Penetrant ExaminationE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)E 607 Test Method for
11、Atomic Emission SpectrometricAnalysis Aluminum Alloys by the Point to Plane Tech-nique Nitrogen AtmosphereE 716 Practices for Sampling Aluminum and AluminumAlloys for Spectrochemical AnalysisE 1251 Test Method for Analysis of Aluminum and Alumi-num Alloys by Atomic Emission Spectrometry2.3 ANSI Stan
12、dard:3H35.1 / H35.1 (M) American National Standard Alloy andTemper Designation Systems for AluminumZ1.4 Sampling Procedures and Tables for Inspection byAttributes2.4 Military Standards:4MIL-STD-129 Marking for Shipment and StorageMIL-STD-276 Impregnation of Porous Nonferrous MetalCastings1This speci
13、fication is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.01 onAluminum Alloy Ingots and Castings.Current edition approved July 15, 2008. Published July 2008. Originallyapproved in 2007. Last previous edition approved in 2
14、007 as B 955/B 955M-07.2For referenced 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.3Available from Aluminum Association,
15、Inc., 1525 Wilson Blvd., Suite 600,Arlington, VA 22209, http:/www.aluminum.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.1*A Summary of Changes section appears at the end of this standard.
16、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.5 Naval Standard:5S9074-AR-GIB-010/278 Requirements for FabricationWelding and Inspection, and Casting Inspection and repairfor Machinery, Piping, and Pressure Vessels2.6 Federal Stand
17、ard:4Fed Std. No. 123 Marking for Shipment (Civil Agencies)2.7 Other Standards:6CEN EN 14242 Aluminum and aluminum alloys. Chemicalanalysis. Inductively coupled plasma optical emissionspectral analysis.3. Terminology3.1 DefinitionsRefer to Terminology B 881 for definitionsof product terms used in th
18、is specification.3.1.1 Hot Isostatic Processing (HIP, HIPped, andHIPping)the process of applying high pressure and tempera-tures to a part through the medium of a pressurized gas, suchas Argon or Nitrogen to remove internal porosity voids.4. Ordering Information4.1 Orders for material under this spe
19、cification shall includethe following information:4.1.1 This specification designation (which includes thenumber, the year, and the revision letter, if applicable),NOTE 1For inch-pound application, specify Specification B 955 andfor metric application specify Specification B 955M. Do not mix units.4
20、.1.2 Alloy (see Section 7 and Table 1),4.1.3 Temper (see Section 9 and Table 2 Table 3),4.1.4 Applicable drawing or part number,4.1.5 The quantity in either pieces or pounds.4.2 Additionally, orders for material to this specificationshall include the following information when required by thepurchas
21、er:5Available from Naval Sea Systems Command (NAVSEA), 1333 Isaac HullAve., SE, Washington, DC 20376, http:/www.navsea.navy.mil.6Available from European Committee for Standardization (CEN), 36 rue deStassart, B-1050, Brussels, Belgium, http:/www.CEN.eu/esearch.TABLE 1 Chemical Composition LimitsA,B,
22、CAlloy Composition, %ANSIDUNS Silicon Iron Copper Manga-neseMagnesium Chromium Nickel Zinc Titanium Tin Other ElementsEAluminumEach TotalF356.0 A03560 6.57.5 0.6G0.25 0.35G0.200.45 . . 0.35 0.25 . . 0.05 0.15 Remainder505.0 0.400.8 0.7 0.150.40 0.15 0.81.2 0.040.35 0.25 0.15 . . 0.05 0.15 Remainder7
23、09.0 0.40 0.50 1.22.0 0.30 2.12.9 0.180.28 5.1-6.1 0.20 0.05 0.15 Remainder850.0 A08500 0.7 0.7 0.71.3 0.10 0.10 . 0.71.3 . 0.20 5.57.0 0.30 RemainderAWhen single units are shown, these indicate the maximum amounts permitted.BAnalysis shall be made for the elements for which limits are shown in this
24、 table.CThe following applies to all specified limits in this table: For purposes of determining conformance to these limits, an observed value or a calculated value obtainedfrom analysis shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified li
25、mit in accordance with the rounding method ofPractice E29.DASTM alloy designations are defined in ANSI H35.1/H35.1 (M)EOthers includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samples for trace elements notspecified in the s
26、pecification. However, such analysis is not required and may not cover all metallic Others elements. Should any analysis by the producer or the purchaserestablish that an Others element exceeds the limit of Each or that the aggregate of several Others elements exceeds the limit of Total, the materia
27、l shall be considerednonconforming.F2Other ElementsTotal shall be the sum of unspecified metallic elements 0.010 % or more, rounded to the second decimal before determining the sum.GIf the iron content exceeds 0.45 %, manganese content shall not be less than one half of the iron.TABLE 2 Tensile Requ
28、irements, (Inch-Pound Units)A,BAlloy TemperCTensileStrength, min,ksiYieldStrengthD(0.2 % offset),min, ksiElongation in2 in. or 4 3Diameter,min, %Typical BrinellHardnessE500-kgf load,10-mm ballANSIFUNS356.0 A03560 T6 separately cast specimens 33.0 22.0 3.0 85505.0 T61 specimens cut from castingsG43.0
29、 37.0 7.0 95709.0 T61 specimens cut from castingsH74.0 64.0 4.0 150850.0 A08500 T5 separately cast specimens 18.0 . 8.0 AIf agreed upon by manufacturer and the purchaser, other mechanical properties may be obtained by other heat treatments such as annealing, aging, or stress relieving.BFor purposes
30、of determining conformance with this specification, each value for tensile strength and yield strength shall be rounded off to the nearest 0.1 ksi, and eachvalue for elongation shall be rounded to the nearest 0.5 %, both in accordance with the rounding method of Practice E29.CTemper designations are
31、 defined in ANSI H35.1/H35.1 (M) T61 Hot Isostatic Pressed (HIP), solution heat-treated, and then artificially aged.DYield strength to be evaluated only when specified in contract or purchase order.EHardness values given for information only, not required for acceptance.FASTM alloy designations are
32、recorded in Practice B 275.GThese properties apply only to castings having section thicknesses not greater than 2.5 in. Tensile specimens were taken from the casting after HIPping was completed.The data used to calculate the minimum values came from samples taken in the axial direction. While not co
33、mbinable with the axial data, tangential values are marginallyhigher.HThese properties apply only to castings having section thicknesses not greater than 2.5 in. Tensile specimens were taken from the casting after HIPping was completed.Samples were taken in both the axial and tangential directions a
34、nd the data was found to be combinable. The data represents both directions.B 955/B 955M 0824.2.1 Whether chemical composition samples are to betaken from the castings (see 7.2),4.2.2 Whether foundry control is required (see section 8.2),4.2.3 Whether yield strength tests are required (see Section9
35、and Table 2, Footnote D, Table 3, Footnote D),4.2.4 Whether test specimens are to be cut from castings inaddition to or instead of centrifugally cast test blocks (seeSections 9, 10.1, 11.2, and 13),4.2.5 Whether special tensile test sampling agreement isrequired for large castings (Section 10.3.2),4
36、.2.6 Whether repairs are permissible (see Section 16),4.2.7 Whether inspection is required at the producersworks (see Section 17),4.2.8 Whether surface requirements will be checked visu-ally or by observational standards where such standards areestablished (see 18.1),4.2.9 Whether liquid penetrant i
37、nspection is required (see18.2),4.2.10 Whether radiographic inspection is required (see18.3 and Table 4),4.2.11 Whether certification is required (see Section 21),andTABLE 3 Tensile Requirements, (SI Units) (Metric)A,B,CAlloy TemperDTensileStrength, min,MPaYieldStrengthE(0.2 % offset),min, MPaElonga
38、tion in5Dmin, %Typical BrinellHardnessF500-kgf load,10-mm ballANSIGUNS356.0 A03560 T6separately cast specimens230 150 3.0 85505.0 T61specimens cut from castingsH295 255 6.0 95709.0 T61specimens cut from castingsI510 440 4.0 150850.0 A08500 T5separately cast specimens125 . 7.0 .AIf agreed upon by man
39、ufacturer and the purchaser, other mechanical properties may be obtained by other heat treatments such as annealing, aging, or stress relieving.BFor purposes of determining conformance with this specification, each value for tensile strength and yield strength shall be rounded off to the nearest 1 M
40、Pa, and eachvalue for elongation shall be rounded to the nearest 0.5 %, both in accordance with the rounding method of Practice E29.CGuidelines for metric conversion from the “Tempers for Aluminum and Aluminum Alloys, Metric Edition” (Tan Sheets) Appendix A, were used to convert the tensile andyield
41、 values to SI units.3DTemper designations are defined in ANSI H35.1/H35.1 (M) T61 Hot Isostatic Pressed (HIP), solution heat-treated, and then artificially aged.EYield strength to be evaluated only when specified in contract or purchase order.FHardness values given for information only, not required
42、 for acceptance.GASTM alloy designations are recorded in Practice B 275.HThese properties apply only to castings having section thicknesses not greater than 2.5 in. Tensile specimens were taken from the casting after HIPping was completed.The data used to calculate the minimum values came from sampl
43、es taken in the axial direction. While not combinable with the axial data, tangential values are marginallyhigher.IThese properties apply only to castings having section thicknesses not greater than 2.5 in. Tensile specimens were taken from the casting after HIPping was completed.Samples were taken
44、in both the axial and tangential directions and the data was found to be combinable. The data represents both directions.TABLE 4 DiscontinuityLevel Requirements for Aluminum Castings in Accordance with Reference Radiographs E 155Grade AAGrade B Grade C Grade DDiscontinuity Radiograph Section Thickne
45、ss, in.14 to346 to 19 mm146 mm3419 mm146 mm3419 mm146 mm3419 mmGas holes 1.1 none 1 1 2 2 5 5Gas porosity (round) 1.21 none 1 1 3 3 7 7Gas porosity(elongated)1.22 none 1 1 3 4 5 5Shrinkage cavity 2.1 none 1B2B3BShrinkage porosity orsponge2.2 none 1 1 2 2 4 3Foreign material (lessdense material)3.11
46、none 1 1 2 2 4 4Foreign material(more dense material)3.12 none 1 1 2 1 4 3Segregation none none none noneCracks none none none noneCold shuts none none none noneLaps none none none noneSurface irregularity not to exceed drawing tolerance on any grade castingCore shift not to exceed drawing tolerance
47、 on any grade castingACaution should be exercised in requesting grade A because of the difficulty in obtaining this level.BNot available. Use14 in. for all thicknesses.B 955/B 955M 0834.2.12 Whether Practices B 660 applies and, if so, the levelsof preservation, packaging and packing required (see 22
48、.4).5. Responsibility for Quality Assurance5.1 Unless otherwise specified in the contract or purchaseorder, the producer shall be responsible for the performance ofall inspections and test requirements specified herein. Unlessotherwise agreed upon, the producer may use his own or anyother suitable f
49、acilities for the performance of the inspectionand test requirements specified herein. The purchaser shallhave the right to perform any of the inspections and tests setforth in the specification where such inspections are deemednecessary to confirm that the material conforms to prescribedrequirements.6. Materials and Manufacture6.1 The responsibility of furnishing castings that can be laidout and machined to the finished dimensions within thepermissible variations specified, as shown on the blueprints ordrawings, shall
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