1、Designation: B955/B955M 10Standard Specification forAluminum-Alloy Centrifugal Castings1This standard is issued under the fixed designation B955/B955M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A nu
2、mber 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 for a
3、luminum-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 PracticeE527.1.4 Unless the order specifies the “M” specification desig-na
4、tion, 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 separat
5、ely 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 concerns,
6、 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 thedate of
7、casting purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B179 Specification for Aluminum Alloys in Ingot andMolten Forms for Castings from All Casting ProcessesB275 Practice for Codification of Certain Nonferrous Met-als and Alloys, Cast and WroughtB557 T
8、est Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy ProductsB557M Test Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy Products (Metric)B660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB881 Terminology Relating toAluminum- and
9、Magnesium-Alloy ProductsB917/B917M Practice for Heat Treatment of Aluminum-Alloy Castings from All ProcessesD3951 Practice for Commercial PackagingE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE34 Test Methods for Chemical Analysis of Aluminum andA
10、luminum-Base AlloysE94 Guide for Radiographic ExaminationE155 Reference Radiographs for Inspection of Aluminumand Magnesium CastingsE165 Practice for Liquid Penetrant Examination for GeneralIndustryE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)E607 Test Method for
11、 Atomic Emission SpectrometricAnalysis Aluminum Alloys by the Point to Plane Tech-nique Nitrogen AtmosphereE716 Practices for Sampling and Sample Preparation ofAluminum and Aluminum Alloys for Determination ofChemical Composition by Spectrochemical AnalysisE1251 Test Method for Analysis of Aluminum
12、and Alumi-num Alloys by Atomic Emission Spectrometry2.3 ANSI Standard: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-S
13、TD-276 Impregnation of Porous Nonferrous MetalCastings1This specification 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 Nov. 1, 2010. Published December 2
14、010. Originallyapproved in 2007. Last previous edition approved in 2008 as B955/B955M-08. DOI:10.1520/B0955_B0955M-10.2For 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 t
15、o the standards Document Summary page onthe ASTM website.3Available from Aluminum Association, 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
16、, http:/www.dodssp.daps.mil.1*A Summary of Changes section appears at the end of this standard.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
17、, and Casting Inspection and repairfor Machinery, Piping, and Pressure Vessels2.6 Federal Standard: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.
18、Terminology3.1 DefinitionsRefer to Terminology B881 for definitionsof product terms used in this 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 t
19、o remove internal porosity voids.4. Ordering Information4.1 Orders for material under this specification 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
20、Specification B955 andfor metric application specify Specification B955M. Do not mix units.4.1.2 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 mater
21、ial to this specificationshall include the following information when required by thepurchaser: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,
22、 B-1050, Brussels, Belgium, http:/www.CEN.eu/esearch.TABLE 1 Chemical Composition LimitsA,B,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
23、 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 Remainder709.0 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 a
24、mounts permitted.BAnalysis shall be made for the elements for which limits are shown in this 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
25、the nearest unit in the last right-hand place of figures used in expressing the specified limit 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 unliste
26、d metallic elements. The producer may analyze samples for trace elements notspecified in the specification. 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
27、 Each or that the aggregate of several Others elements exceeds the limit of Total, the material 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 exce
28、eds 0.45 %, manganese content shall not be less than one half of the iron.TABLE 2 Tensile Requirements, (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
29、A03560 T6 separately cast specimens 33.0 22.0 3.0 85505.0 T61 specimens cut from castingsG43.0 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
30、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 0.1 ksi, and eachvalue for elongation shall be rounded to the neare
31、st 0.5 %, both in accordance with the rounding method of Practice E29.CTemper designations are 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.EHardn
32、ess values given for information only, not required for acceptance.FASTM alloy designations are recorded in Practice B275.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 us
33、ed to calculate the minimum values came from samples taken in the axial direction. While not combinable 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 casti
34、ng after HIPping was completed.Samples were taken in both the axial and tangential directions and the data was found to be combinable. The data represents both directions.B955/B955M 1024.2.1 Whether chemical composition samples are to betaken from the castings (see 7.2),4.2.2 Whether foundry control
35、 is required (see section 8.2),4.2.3 Whether yield strength tests are required (see Section9 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 Whe
36、ther special tensile test sampling agreement isrequired for large castings (Section 10.3.2),4.2.6 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 observatio
37、nal standards where such standards areestablished (see 18.1),4.2.9 Whether liquid penetrant inspection 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),and4.2.12 Whether Practices B660 applies and
38、, if so, the levelsof preservation, packaging and packing required (see 22.4).4.2.13 Whether marking in accordance with Fed. Std. 123or D3951 or MIL-STD-129 applies (22.4).TABLE 3 Tensile Requirements, (SI Units) (Metric)A,B,CAlloy TemperDTensileStrength, min,MPaYieldStrengthE(0.2 % offset),min, MPa
39、Elongation 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
40、by manufacturer 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 neare
41、st 1 MPa, 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 an
42、dyield 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
43、required for acceptance.GASTM alloy designations are recorded in Practice B275.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 fro
44、m samples 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
45、 taken 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 E155Grade AAGrade B Grade C Grade DDiscontinuity Radiograph Section T
46、hickness, 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
47、)3.11 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 tol
48、erance 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.B955/B955M 1035. Responsibility for Quality Assurance5.1 Unless otherwise specified in the contract or purchaseorder, the prod
49、ucer 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 facilities 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 re
