1、a71 MIL-B-24480A(SH)20 June 1985”SUPERSEDINGoiiL-B-24480(sHIPs)30 January 1973MIL-B-21230A29 July 1960(See 6.4 and 6.5)MILITARY SPECIFICATIONBRONZE, NICKEL-ALUMINUM (UNS No. C95800)CASTINGS FOR SEAWATER SERVICSThis specification Is approved for use by the Naval Sea Systems Command,Department of the
2、Navy, and is available for use by all Departments andAgencies of the Department of Defense.1. SCOPE1.1 =. This specification covers static and centrifugal castings ofnickel-aluminum bronze (UNS No. C95800) having good corrosion resistance forgeneral seawater applications.2. APPLICABLE DOCUMENTS2.1 G
3、overnment documents.2.1.1 Standards. Umless otherwise specified, the following standardsof the issue listed in that issue of the Department of Defense Index of Speci-fications and Standards (DoDISS) specified in the solicitation form a part ofthis specification to the extent specified herein.STANDAR
4、DSMILITARYMIL-STD-1OS - Sampling ProceduresAttributes.MIL-STD-2L8 - Welding and BrazingQualification.and Tables for Inspection byProcedure and PerformanceMIL-sTD-271 - NofidestructiveTesr.ing Requirements for Metals.Beneficial commencs (recommendations, additions, deletions) and any pertinentdata wh
5、ich nay be of use in improving this document should be addressed to:Commander, Naval Sea Systems Command, SEA 55Z3, Department of the Navy,Washington, DC 20362-5101 by using the self-addressed Standardization DocumentImprovement Proposal (DO Form 1426) appearing at the end of this document orby lett
6、er.SO DELIVERABLE DATA REQUIRED BY THIS DOCUiCiNT AF.U YECADISTRIBUTION STATEXEYT A Approved for public release; distribution unlimitedProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Iii1IIIK2L-B-24480A(SE)MILITARY (Continued)H2L-STD-278- Fabrication
7、Welding and Inspection; and CastingIo2nspectionandRepairforMachinery,Piping.?ndPre9sure Vessels inNavy.(Copies of scmadards required by contractorsacquisitionfunctions should be obtained from thedirected by the contractingofficer.)Ships of the United Statesin connectionwith specificcontracting activ
8、ity or as2.1.2 Governmentpublication. The followingGovernment publication formsa part of this specificationto the extent specifiedherein.PUBLICATIONNAVAL SEA SYSTEMS COMMAND (NAVSSA)0991-LP-023-3000- Propeller Ship Bronze Strlighteningand Weld Of.(copies of standards and publicationsrequired by cont
9、ractorsin connectionwith specific acquisitionfunctionsshould be obtained from the concraccingactivicy or as directed by che concraccingofficer.)2.2 Other publications. The following documents form a part af this speci-ficaClonto the extent specified herein. The issues of the documentswhich areindica
10、tedas DoD adoptedshall be the issue listed in the current DoDISS and thesupplementchereco,if applicable. oAMSRICAN SOCIETY FOR TESTING AND MATERIALS (ASLll) IB 148-82- Standard Specificationfor Aluminum-BronzeSandCastings.B 271-81 - Standard Specificationfor Copper-BaseAlloy Centri-fugal Castings.(A
11、pplicationfor copies should be addressed co che American Society forTesting and Materials, 1916 Race Street, Philadelphia,PA 19103.)I(Industryassociationspecificationsand standards are generally available 1for reference from libraries. They are also distributed among technical groupsand using Federa
12、l agencies.)2.3 Order of precedence. In the event of a conflict between the text ofthis specificationand the referencescited heren, the text of this speciii-cacion shall cake precedence.3. .REQUIREMSNTS3.1 First article. .lenspecified (see 6.2.1), a sample shall be subjectecto first article inspecti
13、on(see $.3 and 6.3).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-24480A(SH)3.3 Heat treatment. Castings shall be given a temper anneal heat treat-ment at 1250 50 degrees Fahrenheit (“F) for 6 hours, minimum. Cooling shallbe by the fastest me
14、ans possible that will not cause excess distortion orcracking. Propellercastingsehallbe exemptfrom this requirement.3.4 Casting repair. Weld repair of testings shall be performed in accor-dance with MIL-STD-278. Welding procedure qualification, prior to productionwelding, shall be in accordance with
15、 MIL-STD-248. Repair of propeller castingsshall be in accordance with NAVSEA 0991-LP-023-3000.3.k.1 Post+eld heat treatment. When weld repairs are made to the sideof the casting coming into contact with seawater in service or the heat affectedzone extends to within 1/4 inch of the seawater aide cast
16、ings shall be posteldheat treated by the same procedure used to comply with 3.3. Redetermination ofmechanical properties is not required after post-weld heat treatment. Surfacesin contact with seawater shall be specified (see 6.2.1).3.5 Identification markin Identification marking shall be in accord
17、ancewith ASTM B 148, including supplemental requirement S4, except that this speci-fication number shall be used.3.6 Chemical and mechanical property requirements. The chemical andmechanical property requirements shall be as epecified in ASTM B 148.3.7 Nondestructive requirements. The nondestructive
18、 requirements shallbe as specified by MIL-STD-278, or the contract or order (see 6.2.1).3.8meet the4.4.1centractForm and dimensions. The form and dimensions of the castings shallpattern or drawing specified (see 6.2.1).QUALITY ASSURANCE PROVISIONSResponsibility for inspection. Unless otherwise speci
19、fied in theor purchase order, the contractoris responsible for the performanceof all inspection requirements as specified herein. Except as otherwise speci-fied in the contract or purchase order, the contractor may use his OVIIor anyother facilities suitable for the performance of the inspection req
20、uirementsepecified herein, unless disapproved by the Government. The Government reservesthe right to perform any of the inspections set forth in the specification wheresuch inspections are deemed necessary to assure supplies and services conformto prescribed requirements.4.2 Classification of inspec
21、tion. The inspection requirements specifiedherein are classified ae follows:(a) First article inspection (see 4.3).(b) Quality conformance inspection (see 4.4).4.3 First article inspection. Firstarticleinspectionshallconsistoftheexaminationsand testsas specifiedin 4.3.1 through 4.3.3.4.3.1 Sampling
22、for first article inspection. The first caszing submittedfor inspection shall be considered the first article ample.3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-B-24480A(SH)4.3.2 Radiographicinspection. The first article casting shall be radi
23、o-graphicallyinspected in accO$d=ce wfth MIL-STO-271 tO the accePtmce criteriaspecified in MIL-STO-278 of the criticalitylevel specified (see 6.2.1).L.3.3 Mechanical property test. Mechanical properties shall be determinedon highly stressedregions of the casting as specified (see 6.2.1) and shall me
24、etrequirementsas agreed upon between the Command or agency concerned and thecontractor.4.3.4 Basic foundry practices. The contractor shall maintain a record ofthe basic foundry practices (type of melting or refining unit, molding procss,basicriggingdesign, location of risers and chills, and so forth
25、) used in thefirst article casting and shall make no change theretowithout the specificaPPrOvalof the Command or agency concerned. The concraccornay be required toperform specific first article tests and examinations to verify chat the changewill not degrade casting quality.4.3.5 First article test
26、report. The contractor shall prepare a firstarticle test report in accordancewith the data ordering document included inthe contractor order (see 6.2.2).4.4 Quality conformanceinspection. Castings shall be examined and testedin accordancewith 4.6.1 through 4.6.3.1 herein. If any specimen fails to cO
27、n-form to the requirementsof this specificatiOn, the entire 10C shall be rejected,except as specifiedin 4.6.1.i+.k.l Certificationof quality compliance. A certificateOf qualiYcomplianceshall be prepared for eaoh lot of material offered for acceptance(see 6.2.2). l%e certificateshall include actual d
28、ata of specifiedchemicaand mechanical tests. Qualitativeresults of nondestructive tests and ocherinspectionsor tests shall be recorded on the certificate. The certificateshall also state that each lot has been sampled, tested, and inspected inaccordancewith this specificationand meets all specificat
29、ionrequirements.The certificateshall be signed by a responsiblerepresencaciveof thecontractor.4.5 Sampling for qualicv conformance.4.5.1 Lot. A lot shall consistof all castings produced from one furnaceor crucible=c. When two or more furnacemelts or crucible melts, or both,are used co charge a ladle
30、 for pouring, the casting produced therefromshallconstitutea lot.4.5.2 Chemical analvsissamle. A chemical analysissample shall beobtained in accordancewith ASTM 3 148.4.5.3 Mechanical test samvls. A mechanical C*SC sample for s:atic cascingsshall be obtained in accordancewith .ASTX9 148. The saaple
31、for Cencrifu$alcasc-in?s shail be obtained in accordance.wi:h.STXB 27!. %schanicalcast sazmiess:hallaccompanycie castings through che heat :reacments?ecified :3 3.3.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-24480A(SH)4.5.5 Identification
32、of test coupons. All test bars shall be identifiedwith the proper heat or lot number.4.5.6 Sampling for visual and dimensional examination. From each lot,ssmples shall be selected for visual snd dimsnsionx2 examination in accordancewith MIL-STD-105 at inspection level I. The Acceptable Quality Level
33、 (AQL)shall be 4.0 percent defective.4.6 Examinations and tests.4.6.1 Visual snd dimensional examination. Each of the ccstings selectedin 4.5.6 shall be visually snd dimensionally examined for conformsnce with therequirements of ASTM B 148 and the casting drawing. AIIycasting in the lotcontaining on
34、e or more visual or dimensional defects shall be considered adefective item snd rejected. If the number of defective items found in thelot equals or exceeds the rejection number specified in MIL-STD-105, the lotshsll be rejected subject to the resubmittal provisions of MIL-STD-105.4.6.2 Chemical and
35、 mechanical property tests. Chemical snd mechanicalproperty tests shall be performed in accordance with ASTM B 148.4.6.3 Nondestructive tests. The applicable nondestructive tests as speci-fied by MIL-STC-278, or the contract (see 6.2.1). shall be performed in accor-dance with MIL-STD-271.4.6.3.1 Acc
36、eptance criteria. The nondestructive test results shall conformto the requirements of MIL-STD-278, or as specified (see 6.2.1). The system orcategoy of the casting shall be as specified (see 6.2.1).4.7 Inspection of packagin Sample packagea snd packs, and the inspec-tion of the preservation-packagin
37、g,packing snd marking f or shipment snd storageshall be in accordance with the requirements of section 5 and the documentsspecified therein.5. PACKACING(The preparationfor direct Covernmencfor delivery requirements specified herein apply onlyacquisition.)5.1 Packaging. Packaging shall be in accordan
38、ce with the levels speci-fied (see 6.2.1), as annotated under the supplementary requirements section ofASR4B 148.6. NOTSS6.1 Intended use. Bronze, nickel-aluminum castings are intended forseawater applications.6.2 Ordering data.6.2.1 Acquisition requirements. Acquisition documents should specifythe
39、following:Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I11(a)(b)(c)(d)(e)(f)(g)(h)(i)ffIL-B-24480A(sE)Title,number,and dateof thisspecification.First article, if required (see 3.1).What surfaces are in contact with seawater (see 3.4.1).Nondestruct
40、ivetest requirements,if other than MIL-sTD-278(see 3.7 and b.6.3).Pattern or drawing number and condition,whether as cast ormac!inedin accordancewith ASTM B 148 (see 3.8).Criticality level of MIL-STD-278 for nondestructive inspectionrequirements (see 4.3.2).First article mechanical property test loc
41、ations (see 4.3.3).Acceptance criteria for nondestructivetests ocher than :0MIL-STD-278 and systems or category of casting (see 4.6.3.1).Level of packaging (see 5.1).6.2.2 Data requirements. When this specificationis used in an acquisi-tion which incorporatesa DD Form 1423, Contract Data Requirement
42、s List (CDRL),the data requirementsidentified below shall be developed as specified by anapproved Data Item Description (OD Form 1664) and delivered in accordance withthe approved CDSL incorporatedinto the contracc. men the provisions of FAR52.227-7031ire Invoked and the DD Form 1423 is not used, th
43、e data specifiedbelow shall be deliveredby the contractorin accordancewith the contract orpurchase order requirements. Deliverable data required by this specificationis cited in the following paragraphs.Paragraph no. Data requirement title Applicable DID no. L?FlsQL a714.3.5 First article inspection
44、 DI-T-b902 report4.4.1 Certificationdata/report UDI-A-23264 I(Data item descriptionsrelated to this specification,and identified insection6 will be approved and listed as such .inDoD 5000.19L., Vol. II, AMDL.Copies of data item descriptionsrequired by the contractorsin connectionwithspecificacquisit
45、ion functions should be obtained from the Naval Publicationsand Forms Center or as directed by the concraccingofficer.)6.2.2.1 The data requirementsof 6.2.2 and any task in sections 3, 4, or5 of this specificationrequired co be performed to meet a data requireunc maybe waived by che contractingfacqu
46、isitionaccivicy “pen certificationby theofferor chat identical data were submitted by cheofferor and acceptad by theGovernmentunder a previous cmcracc for identicali:em acquired to thisspecification. This does not apply to 5pecific data which nay he required foreach contract regardlessof whether an
47、identical item has bee” supplied prev:.-o“sly (for example , test reports).b.3 First article insDeccion. Invitationsfor bids should provide thatthe Govermenc reserves the right to wai,e ct?s r.squire!cenc for Sanples for Ifirsrarticle ixpec:ion as co chose bidders offering a ?cocuc: .Jb.ici.has bean
48、:evio”sl:.acgui:ecor :es:ed 5:he Co,e:n7.er.c, and chat 5:ddezs oifer:n: S.UC2pr.duc:s, .ic,JishL3 rei:on such Zoc”ctiocor :s:, 3U5: :Ur:.i;h ?,Ji:er,ce.-.l:n:he:z,?.ac:e?ii:,:33,22,.“r zver3=e=“;=s “segc” “=” “ :” a71Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
49、se from IHS-,-,-a71 MIL-B-244BOA(SH)6.4 Propeller alloys. Propeller castings previously acquired toMIL-B-21230, alloy 1, are now acquired to this specification. Alloy 2 is nolonger being used as propeller material.6.5 Changes from previous issue. Asterisks are not used in this revisionto identify changes with respect to the previous issue, due to the extensivenessof the changes.Preparing activity:Navy - SH(Proje
