1、!11L-T-81556A31 January1983SUPERSEDING!lIL-T-8155620 March 1968MILITARY SPEC1FICATIONTITANIUM AhD TITANILM ALLOYS, EXTRUDEDAIRCRAFT QUALITYThis suecificntion1s aoDrOvcd8ARS AAD SHAPES,for useby all”Deportments and encies of theDepartment of Defense.1. SCOPE1.1 . This specificationcoversaircraftquali
2、tytitaniumand titaniumLI11OYextruded a75etal bar and shape products.1.2 Classification. Productsshell be of the following compositions and con-ditions, as specified (see 6.2.1, 6.5 and Toblcs I and IX).1.2.1.COmpOsit ion.COntmercia11y pure titanium (CP)Yield strenRth (Ksi) Code desiunntio”70 cP-i55
3、CP-2ho CP-330 CP-LAlphn citnnium alloyNominal composition Code designation 15A1-2.5Sn A-15A1-2.5Sn (ELI) A-2RAI-lMO-IV A-6Alpha-beta titanium alloyNominal composition6AI-4v6A1-6V (EL)6A1-6V-2Sn6A1-2Sn-4Zr-2Mo1 A-3 has no!ninol compositionthis specification.Code designationA8-1AB-2AB-3AB46A1-2Cb-lTa-
4、0.8% and is noc subject to1 ELI a75eans “extra low intersticials.”Beneficial comments (recommendations, additions, deletions) and any percfnent datawhich may be of use in improving this document should be addressed to: EngineeringSpecifications and Standards Department (Code 93), Naval Engineering C
5、enter,Lakehurst, NJ 08733, by “sing the self-addressed Standnrdizncion Oocument improve-ment Pronosnl (lIllFfIrm 1426) annenri” at the end of this document or bv letter.FSC 9560Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FIIL-T-81556A1.2.2 Condit
6、ion.ConditionFADASTSTA2. APPLICABLE DOCUMENTS2.1 Government documents.2.1.1 Speciflcntions and standards. Unless otherwise speclficd,the followingspecificationsand standardsof the issuelistedin thatissueof theDepartmentof DefenseIndexof Specificationsand Stondnrds (OOOISS)specified in the solicl-cat
7、ion form o part of this specification to the extent specified herein.Description(trcncmcncAs fabricatedAnnealedDuplex annenledSolution trcnccdSolution trentcd and agedSPECIFICATIONSMILITARYNIL-H-81200 -STANDARDSFEDERALFED-sTD-ISI -MILITARYMIL-STD-1OS -MIL-STO- 129 -MIL-sTD-163 -MIL-STO-410 -Heat Tre
8、atment of Titaniumnnd Tttnnium Alloys.Wtnls; Test Methods.Somplin8 Procedures and Tables for Inspectionby Attributes.Mnrking for Shipment ond Stornp,e.Sccel Mill Products Preporntion for Shipmentand Stornge.Nondestructive Testing Personnel Qualificationand Cortificaclon (Eddy Current, Liquid Penecrn
9、nc,%gnetic Portiele;Radiographic and Ultrasonic) .(Copies of specifications and standards required by mr.nufacturcrs in connectionvith specificncquiaitionfunctionsshould be obtoined from the contracting activityor as directed by the contracting officer. )2.2 Other publications. The following documen
10、ts form n p4rt of this spccift-cntion to the extent specified herein. The issues of the documents which are fn-dicated as DoD ndopted shrillbe the issue listed in the current DoDISS and thee.upplement thereto, if applicable.AMERICAN SOCIETY FOR TESTINC AND MATSRIALS (ASTM)AsTME8- Tension Testing of
11、Netollfc Materials.2-. . . . . -”Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Alioys,ChemicalAnnlysisof.to theAmericanSocietyforTestingPA 19103.)AEROSPACE NATERIAL SPECIFICATIONS (AS)HIL-T-81s56AAsTn E9- ComoressionTestingof!lctnlllc?lncerialsOt R
12、oomTemperature.ASTM E 120 - Titnnium and Titanium A11OVS. Chemical Analysis of.ASTM E 146 - Zirconium ond Zirconium(Application for copies should bc addressedartdMaterials, 1916 Race Srrcct, Philadelphia,5AElilts2249 - Chcmicnl Check Anolysis Limits, Titanium and TitaniumAlloys .AM 2631 - Ultrasonic
13、 Inspcccion of Titnnium Alloys.A.WS2643 - Structural Exnminntion of TitttniumAlloys, ChemicalEtch inspection Procedure.AEROSPACE RECOWENOEO PRACTICES (AHP)ARP 982 - Minimizing Stress Corrosion in Wrought Titanium AL1OYProducts.(Application for copies should be nddresscd to SAE. 600 Commonwealth Driv
14、e,Wtrrendnle, PA 15096.)(Indusrry nssocintion specifications nnd standards are generallyavailableforreferencefrom libraries. They ore also distributed among cechnicol p.roupsandusing Federal ngcncies. )2.3 Order of prcccdencc. n the event of o conflicc bccwcen the tcxc of thisspecification nnd the r
15、cfercnccs cited horcin, the text of this specificationshall cake precedence.3. REQUIRE31ENTS3.1 Nncerial Macerinl for produces supplied in nccordnnce with this specifi-cation saultiplc a75elted. The final a75elting cycle shall be consumableeleccrodc prnccice under vncuum. The initinl and intcrmcdtat
16、e melting cycles shallbe consumable clectrodc practice under vacuum, unlcas otherwise spccificd (see6.2.1). When epccificd (see 6.2.1). the first melting cycle shall be nonconsumableelectrode proctlce under vncuum or inert gns nt o pressure no greater than 250 mm ofmercury and shall employ on electr
17、ode tip of either graphite or water-cooledcopper.3.2 Condition. Unlss othervisc spccifiod, extrusions shall be furnished inthe us extruded and anncnlcd (A) condition, with or without subsequent strnightcn-ing (see 6.2.1).3.3 Chcmicnl composition. The chemical composiclon, ns determined by heat orlot
18、 analysis. shall be os spccificd in Table I. . . .Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-81556A3.3.1 Check analysis. Chemical composition vorintlons shall conform to therequireants of AM!+2249.3.4 MechanicalProPerttee.3.4.1 Produces su
19、pplied. Products supplied in the A, CIA,or STA conditions(see 1.2.2 far definitions) shall conform to chc ccnsilc property rcquiremenca ofTables II and 111, os applicable. *en spccificd (see 6.2. 1), nlpha-beta citanlalloy products in the A or STA conditions shall conform co the compressive property
20、requirements of Table 111, os applicable.3.4.2 Heat-treatment capability. Products supplied in the F or A condition(see 1.2.2) shall be capable of bein8 heat-created in accordance with FiIL-H-81200to the tensile property, and, when specified (see 6.2.1), to the compressiveproperty requirement of Tab
21、les 11 and 111, ae applicable to composition and con-dition. Such capability shall be demons trntcd when specified (see 6.2.1) .3.4.3 Mechanical properties of nlphn-beta O11OYS after nulnIRC0.5 Inch lone by full crosB-scctlon from the back cnd of ench extruded Lcngch, shn11 be examined for conform-a
22、nce to the a75acroscructure workmnntihLp (see 3.12) requircmertts. Unless otherwisespecified (see 6.2. l), mncrostructurnl exmmlnoric,n shrillbe performed in accordancewith AUS 2643.4.6.2.2 Hicrostructucc. In udditlon to the a75icrostructure cxmninntion requiredby AM 2663, conform?ncc co rhe mlcrnst
23、ructure (see 3.8) and freedom from eurfacecontamination (SCC 3.10) rcqufrcmcnts shal1 bc dccermlned by examining at lCUSLone polished nnd ucchcd specimen rrnm each snmplc selected in nccordnncc withTable VI1. .%mminacion for surfltceConc:lminntlon SIUI11 be mndc at a magnificationof 100x to 200X ond
24、 for gcncrnl micrustrus. turcat 200X to 250X. Other magnifi-cations shall bc used, os required, to ensure acccptnblc quallty.4.6.3 Dimensional inspection. Somplcs sclecced Ln nccordancc with Table Vllfor dimensional inspection shnl1 be mcnsurcd for conformance to the specifiedshape or dimensions (SC
25、C 6.2.1) nntldtmensionai colerancc (see 3.9) requirements.4.4.4 Ultrasonic impcction. Ultrasunlcnlly inspected product shall be identi-fied as ngretidupon by the acquiring act LvLcy and the contrnccor (see 6.2.1).43.h.1 Inspection personnel. Inspection shall bc performed only by personnelqualified a
26、nd certified to Level II or higher In accordance with FlfL-STD-410.O.L. 1) , CCtI CXCr UtICO LCngC1l, U.JUU LIWt U UIIU K,cdu.el ,!,Sec., ”, t,.1. r.,lzaa “,diameter, shall be inspccced in nccordnncc with .AIS2631 for conforumncc to theultrasonic qunlity requirements of 3.7.4.4.4.3 Inspection of ext
27、rusion billets. Unless otherwise specified (see6.2.1), ultrasonic inspection of biLlecs shrillbe prfOed in liCU Of such in-spection of extruded product, when Chc products to bc extruded from these billetswill have thi.ckneoscs or diameters less thnn 0.500 inch, or are expecced co havesurfuces roughe
28、r than 250 mlcrolnches, even under condltions of best extrusionpractice. BiLlcts co be lnspectcd shal1 have surfaces no rougher thnn 250 mlcro-inches. Inspection shall conform tn AMS 2631 and billets shall be of Qunlity LevelA as a minimum.6. . “. -. .-Provided by IHSNot for ResaleNo reproduction or
29、 networking permitted without license from IHS-,-,-MIL-T-8 1556A4.4.5 Pocm. Sach shipment shell bc itx!pectedfor conformance co thepacking anmrking requirements specifted in 3.1I.1 and Section 5.4.4.6 Chemical analysis. Conformnncc to the chemical composition requirementsshall be determined either b
30、y heat or 10L onnlysis of samples selected in accord-ance with Table VII using ASTM E 120 a75ethods of chemlcnl analysig or FEO-STD- 151,Mechod 112.2 of spcctrochemicsl annlystc. Hydrogen sha11 be ana1yzcd by the hotcxcrnccion method specified in ASl?lK 146 nnd shall be determined on each lot ESship
31、ped . Other analytical methods may be used with the writttin npproval of theacquiring activity.b.4.6. l Referee. In case of dispute, the results of referee chemical analy-sis, by the ASTM E 120 method, shall govern.6,6.7 Mechanical propcrtv tests. Conformance to :Iremechanical property rc!-quirement
32、s shall be decermincd by testing at least one tensile specimen and, inLhe case of akphn-betn O11OYS, nlso onc compression specimen from che back cnd ofcnch sample selected in nccordnncc with Table VII. The product shnl1 be in chcheat treat condition ordered (see 6.2.1), except that for products supp
33、lied in thesolution created (ST) condition, the ends cut from the test samples shal1 be ap,edto the STA condition prior to excising the test specimens therefrom.fb.7.1 Tension test. Tension cafitsshal1 be accomplished in accordance withASllfE 8 using ccnsion specimens conforming to Table VIII, excep
34、t that chc rate ofstrain shrillbc 0.003 to 0.007 inch per fnch per a75inute through the yield strengthand then is irtcrctrsedso ns co produce failure in approximately one additionala75inute. In case of dispute, the results of rcfcrcc tension tcscs perfnrmed on atensile a75achine having a strain pncc
35、r and using a strain rntc nf 0.005 inch perinch per a75inute through the yield strength and n minimum cross-head speed of O.10inch per minucc above the yield strength shrillRovcrn.4.4.7.2 Compression test. When ctmprcssion proper: lcs meeting the requirementsof Table 111 are specified (see 6.2.1), t
36、ests shall conform to the requirements ofAST?4E 9. The strain rates shall be chose spccificd in 4.4.7.1.4.s cction nnd retests.4.5.1 Rejection. Failure of tho test samples co meet the npplicablc require-ments of this specification shrillbe cause for rejection of the represented lot.Retesting in acco
37、rdance with 4.5.2 shall be permitted in the case of conforcmnccco the a75echanical propcrcy requlrcm?nrs. Retesting shall be at the discretion ofche producer.4.5.2 w. The sampling nnd Cest spccimn rcquircmcnts specified in TableVI1 and 6.L.7, respectively, shell be tripled for tensile or compression
38、 retest,as applicable. The retest samples shall include o snnplt! irom each of the ex-truded lengths that failed co meet properties in the original sampling. If oneretest specimen ails, the lot shall be rejected nnd no further retesting shallbe permitted.4.5.3 Replacement of test specimens. Replacem
39、ent of test spccimcns forreasons other than inferior or defective mncerinl shrillbe in occorditncc with FSD-STD-151.7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-81556A5. PACSAC INC5.1 Preservncion/pnckn8 in or is a regularhexagon or octagon
40、, and whoee width or greatest dietnnce between parallel face$ is3/8 inch or grcnter.9Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiIL-T-81556A6.4.2 Estruded shape. A section produced by extrusion chat is long in relationto its cross sectional dim
41、ension and hns n cro.m acction of other than that ofbar.6.“A” identifies all ALPHA titanium ollOye: “AB” identlf ics ALPRA-BSTA alloys; and“B” identifies all BETA O11OYS.6.6. 1.2 Number codinR of CP grndes and alloys.6.6.1.2.1 Numberinu of CP grades. The order of numbering CP titanium gradesfollows
42、directly the order of incrcttsing purtty with reepecc to oxygen concen-tration. This sequence is the reverse of the order of ChtIn8f2Sin yield strength.Such numerical sequencing wna selected because the thrust of development of the CPgrades has generally been in the direction of incrcascd purity, fo
43、r example, thetwo grades of weld filler a75etal (see NIL-R-81588). It does noc appear chat therewill be any additional effort to strengthen CP titnnium by increasing oxygenconcentration beyond thnc of CP-1 .6.6.1.2.2 Numberlnx of alloys. The order of numbering alloys, generallyfollows the historical
44、 nnd present breadth nnd volume of usnp,eof each alloy.Thus, 5A1-2.5Sn is coded A-1 and 6A1-4V is coded AB-1. The .11Air Force - 99User activities:Army - CRNavy - OS11Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE1.Chemicnlcomposition,percentb
45、yweight(see3.3).classi-Nominn1ElementsficationcOmpO-AlSnMovCuFeTotalsicionorAl(:.)(:x)(+)(:x)(2X)otherminys1elmcncsg3_lCommerciallypuretitaniumCP-430.-.-0.200.080.050.0150.15Ba10.30CP-3ho-0.300.080.05O.ois0.20Ba10.30cl-255-0.300.080.050.0150.30Ba10.30CP-170-0.500.080.050.0150.40Bal0.30A-i A-2ElA-4IT
46、5Ai-4.50-2.00-2.5Sn5.753.005Ai-h.so-2.00-2.5Sn5.753.00(ELI)1BAl-iHLI- ivT,!8-2 I6A1-6V (ELI)AB-36Ai-6V-I2s”All-b6Al-2St1- -4Zr-2M0+S17.35-8.35 s.50- 6.75 5.50- 6.50 s.oo- 6.00 5.50- 6.501.50- 2.50 l.BO- 2.20AlphntitaniumnlloYtI1i1I1-0.500.080.05-0.250.050.035AlI0.0so.7s-o.15-0.300.08i.251.25 Alpha-b
47、etatitaniumalloy13.50- 4.50 3.50. 4.50 5.00. 6.001.80-2.20).35- ;.00II0.300.080.0s0.250.080.050.35-0.050.0.31.00 0.250.050.04III0.0200.20Bill0.”400.01250.12Ba10.301yl0.0150.15Ba1O.hom0.01250.20Ba10,400.01250.13Bal0.30i0.0150.20Bai0.300.0150.158010.30 / H_/iProvided by IHSNot for ResaleNo reproductio
48、n or networking permitted without license from IHS-,-,-xIL-T-81 556ATABLE 1. Chemlcnl composition, percent by weight (see 3.3). - Continued%aximum. unless otherwise specified.Hydrogen shall be determined on ench lot of the product as shipped.:;eednoc be determined routinely. tintcrial shall a75eet s
49、tated limitswhen analyzed . Unless otherwise noted, other elements each shall be O.10percent maximum.Iron plus oxygen shall not exceed 0.32 percent.Ocher elemente each ehall be 0.05 oerccnt maximum.“linys” = a75inimum yield strength at 0.2 percent offset, Ksi.“ELI” - cxtrn low incerstitia Is.A-3 classificationhas nominalcomposition: 6A1-2cb-lTa-0. vnlueverse direction.unde
