1、Designation: B955/B955M 18Standard 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 for aluminum-alloy
3、 centrifugalcastings used in general purpose applications. It may notaddress the mechanical properties, integrity testing, and veri-fication required for highly loaded or safety critical applica-tions.1.3 Alloy and temper designations are in accordance withANSI H35.1/H35.1 (M).1.4 Unless the order s
4、pecifies the “M” specificationdesignation, the material shall be furnished to the inch-poundunits.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-po
5、und units are to be regarded separately 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 t
6、o address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was
7、 developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Reference
8、d Documents2.1 The following documents of the issue in effect on thedate of casting purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B179 Specification for Aluminum Alloys in Ingot and Mol-ten Forms for Castings from All Casting ProcessesB275 Practice for
9、 Codification of Certain Zinc, Tin and LeadDie CastingsB557 Test 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 an
10、dMagnesium ProductsB666/B666M Practice for Identification Marking of Alumi-num and Magnesium ProductsB881 Terminology Relating to Aluminum- and Magnesium-Alloy ProductsB917/B917M Practice for Heat Treatment of Aluminum-Alloy Castings from All ProcessesB985 Practice for Sampling Aluminum Ingots, Bill
11、ets, Cast-ings and Finished or Semi-Finished Wrought AluminumProducts for Compositional AnalysisD3951 Practice for Commercial PackagingE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE34 Test Methods for Chemical Analysis of Aluminum andAluminum-Base
12、 Alloys (Withdrawn 2017)3E94 Guide for Radiographic Examination Using IndustrialRadiographic FilmE155 Reference Radiographs for Inspection of Aluminumand Magnesium CastingsE165 Practice for Liquid Penetrant Examination for GeneralIndustryE607 Test Method for Atomic Emission Spectrometric1This specif
13、ication is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloysand is the direct responsibility of Subcommittee B07.01 onAluminum Alloy Ingots and Castings.Current edition approved May 15, 2018. Published June 2018. Originallyapproved in 2007. Last previous edition approved in 2014
14、 as B955/B955M 14.DOI: 10.1520/B0955_B0955M-18.2For 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.3The last appr
15、oved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accorda
16、nce with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1Analysis Aluminum Alloys by the Po
17、int to Plane Tech-nique Nitrogen Atmosphere (Withdrawn 2011)3E716 Practices for Sampling and Sample Preparation ofAluminum and Aluminum Alloys for Determination ofChemical Composition by Spark Atomic Emission Spec-trometryE1251 Test Method for Analysis of Aluminum and Alumi-num Alloys by Spark Atomi
18、c Emission SpectrometryE2422 Digital Reference Images for Inspection of Alumi-num Castings2.3 ANSI Standard:4H35.1/H35.1 (M) American National Standard Alloy andTemper Designation Systems for AluminumZ1.4 Sampling Procedures and Tables for Inspection byAttributes2.4 Military Standards:5MIL-STD-129 M
19、arking for Shipment and StorageMIL-STD-276 Impregnation of Porous Nonferrous MetalCastings2.5 Naval Standard:6S9074-AR-GIB-010/278 Requirements for FabricationWelding and Inspection, and Casting Inspection and repairfor Machinery, Piping, and Pressure Vessels2.6 Federal Standard:5Fed Std. No. 123 Ma
20、rking for Shipment (Civil Agencies)2.7 Aluminum Association Standard:4Designations and Chemical Composition Limits for Alumi-num Alloys in the Form of Castings and Ingot (The PinkSheets)2.8 Other Standards:7CEN EN 14242 Aluminum and Aluminum AlloysChemical AnalysisInductively Coupled Plasma OpticalE
21、mission Spectral Analysis3. Terminology3.1 DefinitionsRefer to Terminology B881 for definitionsof product terms used in this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 hot isostatic processing (HIP, HIPped, and HIPping),nthe process of applying high pressure and temperatu
22、res to apart through the medium of a pressurized gas, such asArgon orNitrogen to 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
23、 the revision letter, if applicable),NOTE 1For inch-pound application, specify Specification B955 andfor metric application specify Specification B955M. Do not mix units.4.1.2 Alloy (Section 7 and Table 1),4.1.3 Temper (Section 9 and Table 2 Table 3),4.1.4 Applicable drawing or part number, and4.1.5
24、 The quantity in either pieces or pounds.4.2 Additionally, orders for material to this specificationshall include the following information when required by thepurchaser:4.2.1 Whether chemical composition samples are to betaken from the castings (7.2),4.2.2 Whether foundry control is required (Secti
25、on 8.2),4.2.3 Whether yield strength tests are required (9 andFootnote D in Table 2 Table 3),4Available from Aluminum Association, Inc., 1400 Crystal Drive Suite 430Arlington, VA 22202 http:/www.aluminum.org.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins
26、 Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.6Available from Naval Sea Systems Command (NAVSEA), 1333 Isaac HullAve., SE, Washington, DC 20376, http:/www.navsea.navy.mil.7Available from European Committee for Standardization (CEN), 36 Rue deStassart, B-1050, Brussels, Belgium, http:
27、/www.cen.euTABLE 1 Chemical Composition LimitsA,B,C,DDesig.HSi Fe Cu Mn Mg Cr Ni Zi Ti Sn Zr FNsOthersEAl. Min.Each TotalF356.0 6.57.5 0.6G0.25 0.35G0.200.45 . . . . . . 0.35 0.25 . . . . . . . . . . 0.05 0.15 Rem.505.0 0.400.8 0.7 0.150.40 0.15 0.81.2 0.040.35 . . . 0.25 0.15 . . . . . . . . . . 0.
28、05 0.15 Rem.709.0 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 Rem.850.0 0.7 0.7 0.71.3 0.10 0.10 . . . 0.71.3 . . . 0.20 5.57.0 . . . . . . . . . . . . 0.30 Rem.AWhen single units are shown, these indicate the maximum amounts permitted.BAnalysis shall be made
29、 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 obtained fromanalysis shall be rounded to the nearest unit in the last right-hand
30、place of figures used in expressing the specified limit in accordance with the rounding method of PracticeE29.DIn case of discrepancy between the values listed in Table 1 and those listed in the “Designations and Composition Limits for Aluminum Alloys in the Form of Castingsand Ingot (known as the P
31、ink Sheets),” the composition limits registered with the Aluminum Association and published in the “Pink Sheets” shall be considered thecontrolling composition.E“Others” includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samp
32、les 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 “Each” or that the aggregate of several “Othe
33、rs” elements exceeds the limit of “Total,” the material shall be considerednonconforming.FOther 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 b
34、e less than one half of the iron.HFor a cross reference of current and former alloy designations see the Aluminum Associations “Designations and Chemical Composition Limits for Aluminum Alloys inthe Form of Castings and Ingot (The Pink Sheets).”B955/B955M 1824.2.4 Whether test specimens are to be cu
35、t from castings inaddition to or instead of centrifugally cast test blocks (Sections9, 10.1, 11.2, and 13),4.2.5 Whether special tensile test sampling agreement isrequired for large castings (10.3.2),4.2.6 Whether repairs are permissible (Section 16),4.2.7 Whether inspection is required at the produ
36、cersworks (Section 17),4.2.8 Whether surface requirements will be checked visu-ally or by observational standards where such standards areestablished (18.1),4.2.9 Whether liquid penetrant inspection is required (18.2),4.2.10 Whether radiographic inspection is required and, ifso, the radiographic gra
37、de of casting required (18.3 and Table4),4.2.11 Whether certification is required (Section 21),4.2.12 Whether Practices B660 apply and, if so, the levels ofpreservation, packaging, and packing required (23.4), and4.2.13 Whether marking in accordance withFed. Std. No. 123, Practice D3951, or MIL-STD-
38、129 applies(23.4).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 anyot
39、her 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 prescri
40、bedrequirements.TABLE 2 Tensile Requirements, (Inch-Pound Units)A,BDesignationFTemperCTensile Strength,min, ksiYield StrengthD(0.2 % offset),min, ksiElongationin 2 in. or 4Diameter, min, %TypicalBrinell HardnessE500-kgf load,10-mm ball356.0 T6 separately cast specimens 33.0 22.0 3.0 85505.0 T61 spec
41、imens cut from castingsG43.0 37.0 7.0 95709.0 T61 specimens cut from castingsH74.0 64.0 4.0 150850.0 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 s
42、tress 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 nearest 0.5 %, both in accordance with the rounding method of Practic
43、e 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.EHardness values given for information only, not required for acceptance
44、.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 used to calculate the minimum values came from samples taken in the
45、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 casting after HIPping was completed.Samples were taken in both the axia
46、l and tangential directions and the data was found to be combinable. The data represents both directions.TABLE 3TABLE 3 Tensile Requirements, (SI Units) MetricA,B,CDesignationGTemperD Tensile StrengthE,min, MPaYield StrengthE(0.2 % offset),min, MPaElongationin 5D, min, %TypicalBrinell HardnessF500-k
47、gf load,10-mm ball356.0 T6 separately cast specimens 230 150 3.0 85505.0 T61 specimens cut from castingsH295 255 6.0 95709.0 T61 specimens cut from castingsI510 440 4.0 150850.0 T5 separately cast specimens 125 . . . 7.0 . . .AIf agreed upon by manufacturer and the purchaser, other mechanical proper
48、ties 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 MPa, and eachvalue for elongation shall be rounded to
49、 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 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 fo
