o
0
MIL-T-6736Bs MAY 19S5
Smpcrsedkg
MlbT-s7&iA(ffi)
2 Nmrembsr19s4
MIbT-s7s I
12 June 1950
AILITARY SPECIF1CATION
TUBING, CHRONIE-IMOLYBDENUM, 4130 STEEL, SEAMLESS AND
WELDED, AIRCRAFT QUALITY
:’h’%a%z”.’%%??xrw j’ Rr:
.
1. SCOPE
1.1 Scope. Tbk spcciticntion covers chro-
rnium-molybdmrum (4130) 6eamless and welded
steel tubing of nircmf: qunlily.
1.2 Ckrssificntion. The tubing slmll be of
Lhe folinwing gmdcs, types, and phfical
conditions, as specified (see 0.2):
Grades:
Allmling-lhgulnrgrade,exceptlhet
type1,condition (N) tubing is slso
avc.ifnldc in o specief (S) @o having
reduced dccnrburization limits.
‘ryp=:
Type I—Round
Type 1l—Reclar@nr or square
Type 111-S@rmdiie
Typo I\’-Ovnf
Physicrd conditions:
(A) —Amrcrded
(N) —Normslizcd or SWMS rehewd
(HT-125)—Heat treated 10 a minimum
tensile strength of 125,000 psi
(li”r-150)-11.3at lrcatcd @ ~ minimum
tensile s~englh Or I50,000 psi
(HT-lSO)—HesL tmokrf to a minimum
tensifo strength o! 180,000 psi
2. APPLICABLE DOCUMENTS
2.1 ‘fle following dncumente, of the issue
in efiecL on dnte of invitation for bids or
requcsL fOI pKqrOWd, fOmr O part Of Lti Spm-
itication of the went specified bereirr:
SPECIFICATIONS
hllMrAnl
Al IbI-68GS-Inspection Prom==, Mag
netic Psrtideo
hf11+lll173-CorrOsion Preventi\.o
Compnund, Solvent C I I t l r a c k ,Co l d Ap -
plication
STANDAIIDS
Fk:nErrhL
Ircd. TCS Method !Xd. No. 151—hletnk
Test Mcthnds
Fed. Std. No. 183-Continuous Identific
I . i nnN f a r l i i ngn f Imn and Steel Prnducti
MILITARY
MIL-STD-129—hforkmg for Sbipmenl
and S1OIWO
MIL-sTD-lG3-steel Milf Products
Prcpnmtion for Shipment and Srornge
MSwS~t+Tolcmnccs-SOLmk SteGI
Tubhrg, AkcrafL Ahfmme, Round
hfS33532-Square and Rect-sngrdsrTut
ing-Cnrbm] Steal and Alfoy Steel, 0.3
Carbon, M nximum
hlW3530–Tolcrnr] cm–Weldd Cnrbo
and AUoy Steel Tubing
MS33W4-Standwd Dimensions fc
SLresm!ilm nnd Ovol Tubular Shnpes
Ain FOncZ-h’Avr’ ACtCONA~ICAL
AND 10102—Tubing-Standard D“me:
sions fnr Round .%nnd- Alfoy Steel
(Copies of qmilim!ions, sandm!s, dtmins% at
publications rcquirwl by mpplicm in comcctimi wil
6@0c Proc*:mmcnt funetiom nhould be obtahml f,O
the procuring acti.it! or aa dimctcd by tie conwnc:ir.
Omcct.)
2.z other publications. The fO~OW& dOe
umerrts form a pnrb Or l hm spec”tication to :1
extent speciGcd herein. Unlc=+ OLbc f i i
dicated, tbe issue in eflect on date of inriteti(
for bids or request for propnsd sbsfl apply:
E
Fsc 4710
MIL-T-6736B
SocImY OF ALTOMOTIVE 12XG[XEERS AERO-
SPACE XI.*TERIAL SPECLFICATIOSS
A\LS2301—.iircrahQualitySteelClean-
Iiess,MagneticPsrtkleInspectionPro-
redum
A>lS2?G40-\lngnetic Particle Inspection
(GpiS,~ of .5A1.: puldimtiom Imy bc obt nined from
Ih. Socitity .[ Aulon,.:ivt I.;nginwmv Inc., 495 Lc.xinc.
to!, Awmu., Xc,, York, X, Y., 10017.)
3. REQUIREMENTS
3.1 DaIs. Unless otbcmisc specified in the
cou LrucLor order, no dntu nrc required by this
spccifkution or any of the documents refer-
enced in section 2 (see 6.2).
3.2 Nlalerial. TIIC tubing sbnll be O( air-
cr!dl qu:diLy. The Ilmtcrinl shrill be ruag.
I!clic,!lly imspcc[c.d ill accordance with the
procedures of AhlS 2301, and sbaU not exceed
the size nnd frcqtlel)cy rsLing limits indicnted
iu tkc partqpph el] Litkd ‘(Disposition” of
AJIS2301(see4.5).
3.2.1 lfanu~acfurin~ process. The steel sbull
be manufactured by the open-hcnrLh or elec-
Lric-(!lrnacc process, unkm a single process is
specified in the contract or purchn.sc order..
3.2.1.1 SuOicicnt discard shall be taken fronl
ench ingot h cnsuro freedom from piping and
undue segmgstion.
3.3 Chemical composition. Tlm chemical
composition of lubingshallbe M spcciiied in 6
table I.
TALILE 1. Chmzicd mmp.a, ilion
mm<,,,, I A“,l=. Icheckarla,,p
l“
pwcmt , togmt:.
,
Cmb.n .. . . . . . . . . . . . . (1, u-n, 3:{ &ll, 0“
Mmgnncsc. . . . . . . . . . . .40- 6(I * .103
Phmphoms . . . . . . . . . 02; (m:,,) +, MJ
S.lru r . . . . . . . . . . . . . . . Irx [,, !:!s) +, WI?!
SOimw.. . . . . . . . . . . . . w-u. 33 * w
Chromium... . . . . . . . . ,Su-1.Iu +-.U5,-n.U3
hfolyl,dcnu, n . . . . . . . . . .15-0, ?5 *.W2
1 ,
, Individu,,! !l..,.,,,l!,,.,,l.,,, !!., ? Vxy 1,?!!,,,1,. s,m.lf,.,d,.!1:., ,4, !be
,,,M,, ‘h.., ! in ,1!,checknn,l, si! .“1,,,,,,,, cm,,, U.!, ,1(,,,,. !,,,1“ m,,
I,mt stroll 0., ?arr boil, .bom *,,,I bclou ,1,!, ,1..1:”4 ,mce.
3.4 Nlechanical properties. After tbe h!sL
cohl-drnw Imssj tlm tubing shrill bc mmnnlizcd,
stress rdicrcd, or othcrwisr. heat tmnt cd to
develop LIWrmwhnnical propcrtiss specified in
table 11.
3.5 Dimensions. Tbe dimensions of typo I
lubkgskullCtjdonntothest.andnrd diumn-
sions show] on AISD101O2. Thc dimensions of o
L.yp=IIIandIVsbsflconformh thostnndard
dknensionshownonhlS33534.TINdimensions
Conditiou and WBU thickmss
1nch
,.. –..—— . .
>’icld strcmgth at 0.2 Elqmtion in 2
p..rccnt s,cl or at cxtrmsion
Tmsilc
mcl,r?,
]ndwa ted
mengtl,
(min.)
(Min.)
I
Extension
under load
F~:::;Ic I :;:,
—! —. ! .— ,
p5i
I
psi
I
Inches in 2
I
Pwccnt
I
I%rcmt
imbm
I 95, OMl I I I I
9s, m 76,000 0. CQ90
93, 00o
10 5
7s,000 .0090 12 7
90,ooo 71), 000 Oo,Si 15 ]1)
,. ..— ——
(IIT-123),UI WJII, . . . . . . . . . . . . . . . . . . . . . . . .
I ::JN
IOo, lloo .Ul[); I 12
(ilT-150) Allw.lls . . . . . . . . . . . . . . . . . . . . . . . . . 1:{5, Llou
(UT-l SO) Allwnlls . . . . . . . . . . . . . . . . . . . . . . ...! 1.s3, 000 165, 000 w ‘ :1 ~
I I I I I
, Maximum. ●
2
of type II tubing shall be tMnogotinted between
the supplier and purchaser.
3.6 b.mgtb.
3.6.1 /Zract fengtb. Tub~g ofallsizesIIMy
be ordermf tn o.xact Iengtke or io lengths ex-
pressed M n multiple of a defink unit, with
tolcrnncca 0s spocifled in tho controct or pur-
cbnce order.
3.&2 MiU kngfhu. When oxc,ct or multiple
lengths cue not spbcbicd (see 0.2), tubing will be
acccptod in m“fl Icngtbe of 5 to 20 feet, buL not
more tbnn 10 pcrcookof nny ordershallbe
furnisbcd in !smgthc shorter tbon 12 fcot.
3.7 Tolerances.
3.7.1Type I. Tho pcrnkible vmiations
in dimensions of type I scnmlom tubing sbnll bo
nc show-non MS33529 nod for typo I welded tub-
ing ns shown on MS33530.
3.7.2 Typ.a II, III, and 1V. Thn pcmris-
sible variations in dimcocions of all types If,
IH, ond IV tubing shrill bo os shown on
MS33S32.
3.8 Grain tizc. The austrmitic grnin cizo of
the steel used for thii tubiig shnlf ho prcdomi-
nmtfy No. 5 or liner, with grnins es huge es
No. 3 pmmtilblo, M dotermincd by the method
specified in section 4. For coorrdmc tubing,
grnin sizo shell bo dot-snnirmd on a bJlet bcforo
piercing, hot working, or cold drnwing.
3.9 Dccnrburizotinn.
3.9.1 Re@ar grade. The nvcrngo depth of
total decarburizntinn of regular grnde, mndi-
tinn (N) tubing, nc rcccivcd from tbo tubing
manufncturor, shrdl nnL oxcood tho mounts
Iistcd in tabln 111. Tim depth nf dccarbmiza- ‘
tion in teble 111is the total dccnrburkotion, or
tho sum of Lbe dopthc of compla@ dccnrlmrizn-
tion nnd pnrtinl docnrlrurir,ntion on both the
imrcr and outer surfncm of Lhe tulro. No mom
than 75 percent of tho nmount, Iiited in tnblo lLI
is ta appearon theoutmrsurfacoofthotube.
Tbc depth of complete dccnrburkmLion shalf not
oxcccd onc-hnlf tbe nllowable total dccnrburicn-
t,ion. (The word %vomgo” monnc tbo rmtdts
of sevcrnl readings on a cr0c9 section of tnbiig.)
3.9.2 Sprcial prade. The pmmtilbln dc-
cnrburizntion of (S) grnde, type I condition
MIL-T-6736B
TAIILE 11[. Dcmrburimfion {iuth
Allomablo told Mnsimum total
t%=t%) ~Dby&n dms.rburizmion(OD) fiiCh)
finch)
upiOo.040. -------- a 010 aoos
0.041 to o.oiYJ. . . . . . .012 .009
0.051 to 0.070 ------- .014 .011
0.071 to o.oso ------ . ole .012
0.0s1 too.000------- .018 .014
0.001100.100 . . . . . . . 020 .015
0.101 la 0.150 ------- .022 .017
0.161 Lo 0.2011 . . ..-. .020 .020
(N) tubing shnR be onn-bnff that fisted in table
I [1, with nn complcta docnrburizction pcr-
mimiblo.
3.10 (kmdition. Unln5e othcrwisn sfrecilied,
tubing shalf ho fumisbcd in rcgulcr grade,
typo I, condition (N).
3.11 IdentiIlcntion of product. Encb tubo
shrill bo nmrked in acccmdoncowith Fwi. Std.
h’o. 163 end shall include ttm number of this
spccificntinn.
3.12 Workmanship. The tubingshnRhave
n finkhconformingh thebestpracticefor
c.ircrnftqunhtymatminl.Itcbnllho smooth,
cfcnn,nnd froo fmm hnnvy SC& or oxide no
tbo interior and exterior surfaces, nnd ehall be
free from burrs, scrims, team, grooms, lamina-
tions, slivers, pite, cnd other injurious defects.
Surface impcrfoctions, cuch as hmdlhg marks,
strcigbtoning marks, light nrnndrcl end die
marks, shollow pits, nnd ccnlo pattern wilf not
bo considomd IIS injurious defocls, pruvidod
tho imperfoctinne nro removable without ro-
duc”mg the dimncter or wall tbicfm- of the
tulimg Irclow the pcrmicsiblo tolmnnco fimits.
Tho rmnornlof surfaceimperfections ic not
required.
3.12.1 WeJd. The weldshnffnot contain
defects greater than XAmb fong or depths
grcntcr than nno-half tho wnfl thickness. The
rvclded tubiig mny be pickled or olhcrwim
clcnncd, if ❑cccsnry, to meet surfncc conditions
speckled ilcrcin.
4. QUALITY ASSURANCE PROV1S1ONS
4.1 Respnnsibfity fer inspection. Unfcss
otborwiso cpccihf in the contrect or pumham
3
MIL-T-6736B
order, Lhe supplieris responsiblefor the per-
formance of rdl inspection reqrriremenk as
specified herein. Except m otherwise. speci-
fied, thesuppliermay utilizehi own facilities
or any conumrcidlaborato~acceptableto
theGovernment.The Governmentreserves
Llreriglrttipcrtormanyoftheinspectionsset
forthintbcspecificationwheresuchinspections
oredeemedneccsmryb ossurcsuppliesand
servicesconformlaprwcribedrcquiremenk.
4.2 Qualityconformanceinspection.The
examinationand testingof tubingshillbe
clcssificdtt9qualityconformancehspection.
4.2.1Sampling md inspection shall be per-
formed in accordance with Federnl T&t Method
Standard No. 151 and m specilled herein. If
the material is taken from stock and is not iden-
tifiable tM to heat and method of manufacture,
or if the identity of any portion of tha shipment
is obscure in any respect, ndditiomd samplas
sboll bo selected to determine conformance of
all portions of the shlpmcnt ta this specification.
4.3 ht. A lot shall consist of tubing pro-
duced from the same heat and which is essen-
tially homogeneous in aff respects, in the same
condition, of the same typo, size, md wall
tbiclme.w offered for delivc~ at the same time.
4.4 Examinations.
4.4.1 .!hamimziion of producl Erich length
of tubing shrdf be visually exnmhmd for com-
pliance with surface condition and workman-
ship requirements. Smnples selectad in accord-
ance witlr table IV shall be examined to assure
compliance with the specified dimensions and
tolerances, and identillcution marking require-
ments.
T&!JLE IV. Sampling @m
-! Acn;:~rmLotsize S.3mplc size rejectible
1 to 15.................. Au o
l(3to180.......-..----- 15 0
181t0300.............. 35 0
301r.a500.............. 50 1
Over 500 . . . . . . . . . . . . . . . . 75 2
4.4.2 Eramitiion Oj preparation jar o!c-
liserg. Preparation for dahvery sbnlf be ex-
amined for confommnca to section 5.
4
4.5 Magnetic inspection. Specimens shall
be selected, inspected, and rated in acrmdance
with the procedures of AMS 2301. Inspection
sbalf be in accordance with MII.-I-686s or
AMS 2640.
4.6 C%emicalanalysis.
4.6.1Sampling.At leastonesampleshall
besdectedforcheckchemicalnnnlyskinac-
cordancewithFederdTestN4ethodStnndard
No.151@ representeachheatint,helot.The
sampleshallconsistofnotlessthan2 ounces.
4.6.2iifcifwd.Specimensshallbeprepared
in accordance with Methods 111 or 112 of
Federal T&t Method Stnndwd No. 15i, and
shall be tested by wet chemiccf or spectmcherni-
cnl methods. In the event of d~pute, antdysis
shall be by wet chemical methods.
4.6.3 Waioer. Samples for check of chemi-
cal anolysis m.y be waived provided that all of
the material in the lot can be identilled as being
made from a heat previously analyzed and
found to conform to the chemical composition
speci6ed herein.
4.7 Tensile test.
4.7.1 Sampling, At least onc tensife test
sample shall be sefected from each 1,000 feet
or less of each lot for determination of mechan-
ical pr0pertie9.
4.7.2 Preparation oj specimenn. Tensile
test specimens shall he prepared ill accordance
with J4ethod 211 of Federal Test Method
Standard No. 151.
4.7.3 Method. Temife tests and determina-
tion of yield strength and elongation shall be
conducted in accordance with hfethod 211 of
Federal Test Method Standard No. 151.
4.8 Grain size.
4.8.1 Sampling. One or more samples
shall be selected from one or more billets used
in makmg the tubing and suitablo for deta-
ining the austcnitic grain size.
4.8.2 Preparation Oj specimenu. The speci-
mens sbalf be taken one-half way between the
center and outaide of tho biflet. The specimens
shalf be appmximntely l-inch square or round,
and normalized at 1,650° F.
4.8.3 MdJwd. The grain size rdwdf be
determined by procedure B or D of Method
311 ofFederalTestMethodStandsrdNo. 151.
i
(
MIL-T-6736B
(
(
4.9 Decarburizatiotr.
4.!).1 Snm#inp. At least ono mess mc-
tioncd WIUP1Ocbnll be selected from each 1,000
feet or less of esch lot. Tho sample sbslf bo
cut at lenct thren-fourths of M inch fmm the
mill end.
4.9.2 Prqmrafion OJ apa”mcna. The r+peci-
mens sbnll be mctaflogrnphicnlly prepnred and
otcbcd in 5 percent. nitnl.
4.9.3 Afcthod. Tbo spocimmm slInlI be
exnmined at 100 dinmctem.
4.10 Rejecfinn and retest. Faifuro of a
specimen to meet, tbo test rnquimmnnls sbnll
be eausn fnr rejection of tbo lot. At tbn dis-
cmtinn of tbo cnntrsctar or supplier, or bntb,
rctmt will Ira permitted. A retest snmplo of
five specimens shall bo tested to rcpIoco each
fniled specimen of the originnl snnrplo. If
ono ofthoretestspecimens fail, tlm lnt shall be
rejected with no further rctestirrg permittsd.
5. PREPARATION’ FOR DELIVERY
6.1 Preservation. Unless otb erwiso speci-
find, nll tubing sbsll be coabxl inside nnd
outside with mrr-esion-pravcntivo compound
mnfnrming to ML-C-16173, wbicb shall be
dilutd by the ndditinn of 50 percent, by
volume, of tbo solvent spccificd in pnrngmpb
entitled “Snlvcnt” of MfL-G16173.
5.2 Preparalinn fnr shipment. Unless
n tbcrwise spocilied, tubing sbnll bo prcpnred
for shipment in accnrdmco wilb love] A of
MIL-STD-163 (Seo 0.2).
5.3 fihwking of sbipmenl. Shipping con-
tainnm shell bo rnnrked in acmrdsnco with
MIL-STD-129.
6. NOTES
6.1 Intended use. Tbo tubing is intended
for um in aircraft construction, pnrticufnrly
whoro osrts nm fnbricnted bv wcldiuc. Prc-
hentin~ prinr to welding is- dcsirabfi. The
spccief grado tubing is prcfnrnblo for applica-
tions involving bending fntigm loads inasmuch
tM the tubing surfacn is of Kim strength tbnn
tlm surface nf regulnr gmdo tubing.
6.2 Ordering dntn. Procurement deou-
ments shoufd specify:
(a) Title, number, nnd date nf thii speci-
fication.
(b) Size md wnll thickness (for round
cross sectinns, see AND 10102).
(c)Amount (aggmgnte length in feet;
length of ench piece when cxnct lengths
nro desired) (see 3.6).
(d) Tho typo, if type I is nnt desired (sea
1.2).
(e) The renditionnnd gre.daifrendition
(N) regufargrsdoisnotdesired(SW
1.2mrd 3.10).
(f) .%nmfms or wefded, m d&md.
(g) Datn rcq.iromcnts (see 3.1).
(h) f-wel of pnckagiug, if other tbnn level
A (SCO 5.2).
(i) ~;~tion, if other than .pdlcd
6.2.1 ilfechnniml propcrfies. It%cn tub%
is LO bc heat treated (qucrmbed and drewn) to
defiiita meclmnicnl properties specilied by the
procuring nctivity, tho mntrnct or order sboufd
stata tbe desired mecbanicnl properties, and
the manufacturer should esteb!isb the optimum
quenching mngo nrrd quenching medium to be
used.
Custodians: User actkltlcs:
Armyitl R Armr-MO
,Na.,—VI’ P Nary-
Air Fo,cc--(:t) Air Form-
DSA—.X Reparfng activity:
R.3VICW.Ymxidtics : Air Force-(l 1)
Armr-?d R, M 1 project No. 4710-010S
.Na.,— W’P
Air Force-(1 I). (G9)
Rm+ewlumr Ma7nMion in current m o f th e d a m o f
this documcnl. For future coordination of cbangm
10 thin dncumcnt, draft cirmlntion should be based cm
the infwmr.than in tho current Fcdernl Supply C%ssi-
Iicntlon Iiiting of DoD Stmdurdkntion Omumen@
I
5
1.
( SPEC I F I CAT I ON ANALYS I S SHEET I
FORM .—s0 mu f f i nI l l JRuA”NO. , ,*.-
INST RUCTIONS
Tlds ahcctistohoElk!out b~ynnddth.r Gw-mmtormntmctir, in~lvdinthewdties@fimtin
in prwwemcnt of products for u t mala usc by tbo Department of Def- Tbu sheet u pmvidcd for obtaining
information on Lbc usc of thu spccbktlon which will Insure that mdtddo products can be pmcurcd with n udrdmmn
amount of delay and at tbo least .xeJL Commcnln and the rctum of UILYform will Ix apprctiab?d. Fold on Unm
on mvcrsc side, staph in comer, and send la pqe.ring .xtivily.
SPECIFIU1lON
Al l&’r-G73011 ‘1’ubing, Cbromc-hfolybdmum, 4130 Steel, ok, AC QunliLy
ORGANIZATION C1l’Y ANO STATE. .
CONTRACT NO. OIJANTITY OF ITEMS lWOCIJREO 00LLAR AMOUNT
$
MATERIAL PROCUREO UNDER A
❑ .#R,m GOvnlwtatn CON1-rtacr ❑ WOCONTRA-
1. HAS ANY PART OF THE SPECIFICATtON CREATED PR08LEMS OR REWIRED 1NTERPRETATION IN
PROCUREMENT USI?7
A. GIVE PAR6GRAPH NUMBER AND wOROING
m flEcOMMWOATIONs FOR CORRECTING THE 0EFIcICNcIE5
2. COMMENTS ON ANY SPEC1FIC4TION REQuIREMENT CONSIDERED TOO RIGID
S. 1S THE SPECIFICATION RESTRICTWE?
❑“vus I--JNO IF “YES’ IN WNAT W’AYf
4. REMARKS (Auach ant! fined daf. which rnav beo! use in imprmn”.q thu ,P@icofion. If tire are addi!iond
paper,, allac%jorm .“d pke MA in . . cn.dope mbfmu~d t. preparing .dwilv)
SUBMITTED OY (Prin&d or 1~ II- and .dwil#) I OATE
I.-
00 FORM 1426
(
FOLD
POSTAGE AND FEES PAID
OFFICIAL BUSINESS
~ommander,
Attn : SEPS
Systems Engineering Group
iVright-PattersonAirForceBase,Ohio 45433
FOLD
主营业务范围:ASTMASTMASTMASTM、NASNASNASNAS、NASMNASMNASMNASM、MILMILMILMIL、ISOISOISOISO、ENENENEN、DINDINDINDIN等技
术
翻译;技术资料翻译;国外技术标准中文版代购。
业务 QQQQQQQQ:2298175560229817556022981755602298175560
专业 诚信
质量不满意,可不付款专注于技术翻译