IS 7902: Aluminium alloy forging stock and forgings for aircraft purposes (Alloy 24345)

10 Pages·2001·1.1 MB·English

by  Bureau of Indian Standards

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IS 7902 (2001): Aluminium alloy forging stock and forgings
for aircraft purposes (Alloy 24345) [MTD 7: Light Metals
and their Alloys]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS 7902:2001
m’dhw=m

Indian Standard
ALUMINIUM ALLOY FORGING STOCK AND
FORGINGS (ALLOY 24345) FOR AEROSPACE
APPLICATIONS — SPECIFICATION
(First Revision )
ICS 49.025.15; 77.120.10

G BIS 2001
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

April 2001 Price Group 2
Light Metals and Their Alloys Sectional Committee, MTD 7
FOREWORD
This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, atler the draft finalized
by Light Metals and Their Alloys Sectional Committee had been approved by the Metallurgical Engineering
Division Council.
This standard was first published in 1975. While reviewing this standard in light of experience gained during
these years, the Sectional Committee decided to revise the standard.
Forgings ofA1-Cu-Mg-Si-Mn alloy arewidely used foraircraft structural fittings and components. This standard
isprepared to specify the requirements for forgings stock and forgings.
In this revision, the alloy composition, mechanical properties have been rationalized and generally brought in
par with following International Aerospace Specifications, while keeping in view indigenous manufacturing
practices.
AU4SG(IGC. 04-32-044) Standard extrusions bars — Sud Aviation. (French specification).
BS 2L 77:1971 Specification for forgings stock and forgings of aluminium-copper-
magnesium-silicon-manganese alloy (solution treated and precipitation
treated). British Standards Institution.
Gost 4784:1974 Wrought aluminium and aluminium alloy. Grade-AK8 (Russian
specification).
QQ-A-367H Aluminium alloy forgings (Alloy 2014). Federal Specification USA.
AIR 9051A General acceptance requirements of semi-finished products inaluminium
alloys for forgings.
AFNOR A7-4SG (2014) Ministry of Defence. France.
WL 3.1254 Teil 1(May 1988)Aerospace: Wrought aluminium alloy 4.5 Cu -0.9
Si -0.8 M; -0.5 “Mg(hand forgings) German standards.
For the purpose of deciding whether aparticular requirement of this standard is-complied with the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with

IS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in

the rounded off value should be the same as that of the specified value-in this standard.
IS 7902:2001
Indian Standard
ALUIWNTUM ALLOY FORGING STOCK AND
FORGINGS (ALLOY 24345) FOR AEROSPACE
APPLICATIONS — SPECIFICATION
(First Revision )
1SCOPE 3 TERMINOLOGY
This standard covers the requirements of aluminium 3.1For the purpose of this standard the definitions as
- copper - magnesium - silicon - manganese alloy given in IS 5047 (Part 1),IS 7674 and the following
(Alloy 24345) forging stocks (billets, bars, rods, shall apply.
sections) and forgings. The material is intended
3.1.1 Approved Scrap
primarily for aircraft structural parts requiring
The scrap which isderived tlom manufacturer’s own
moderate strength.
production from approved material, ingots and
2REFERENCES castings etc, where in the material composititm has
been established with regard toboth alloying elements
The following Indian Standards contain provisions
andimpurities totherelevant specification segregated
which through reference in this text, constitute
and identified to -the satisfaction of inspecting
provision of this standard. Atthetime ofpublication%
authority.
the editions indicated were valid. All standards are
subject torevision andparties toagreements based on 3.1.2 &t (Melt)
this standard are encouraged to investigate the
The product of either one furnace melt or a number
possibility ofapplying the most recent dltions of the oftirnace meltswhere suchareaggregated andmixed
standards indicated below prior to sampling or pouring.
ISNo. Title 3.1.3 Extrusion Billet
23:1980 Primary aluminium ingots for
A solid or hollow cast billet for extrusion to solid or
remelting foraimraftpurposes (third
hollow shapes and sections.
revision)
504:1963 Methods of chem ical analysis of 3.1.4 Harmful Defects

ahnninium and its al loys (revised)
Any defect prejudicial tu subsequent manufacture,
1500:1983 Method for Brinell hardness test for
-fabrication or any use of material.
metallic materhds (second revision)
1608:1995 Mechanical testing of metals — 3.1.5 Work’sAnalysis
Tensile testing (second rewkion)
The routine analysis carried out by the m~ufacturer
3658:1999 Code ofpractice forliquidpenetrant
in order to control the quality of the material.
flaw detection (second revirion)
3664:1981 Code ofpractice forultrasonic puke 4SUPPLY OF MATERIAL
echo testing by contact and
General requirements relating tothesupplyofmaterial
immersion methods (/irst revision)
shall conform to IS 10259.
5047(Palt 1): Glossary of terms relating to alu-
1986 minium and aluminium alloys: 5 MANUFACTURE
Part 1 Unwrought and wrought
The alloy made from primary or virgin aluminium
metals (second revirion)
shall comply to the requirements of IS 23. Unless
7674:1975 Procedure for inspection andtesting
otherwise agreed to,theselection ofalloying elements,
of alurninium and aluminium alloy
whether itisapproved scrap orno$ shall be lefttothe
forging stock and forgings for
discretion of the manufacturer.
aircraft purposes
10259:1982 General conditions for delivery and 6 FREEDOMFROM DEFECTS
inspection of aluminium and
Forging stockandforgings shallbeofuniform quality,
aluminium alloy products
sound and free from harmfid defects.
1
IS 7902:2001
7CHEMICAL COMPOSITION 190“Cfollowed by cooling inair. Tempera-
ture and duration which have been found
The material when analyzed as per IS 504 or any
appropriate are as given below:
other established instrumental/chemical method shall
Temperature Duration
conform to the requirements as given in Table 1.In
in ‘C in h
case of dispute, the procedure given in IS 504 shall
be the referee method. However when the method is 160 12-20
not given in IS 504 the ~eferee method shall be as 175 9-12
agreed tobetween thepurchaser andthemanufacturer. 190 3-6
9.2 Unlessotherwise agreed tobetween thepurchaser
Table 1Chemical Composition
and manufacturer, the heat treatment (solution
(Clause 7)
treatment and precipitation treatment) is limited to
maximum two heat treatment cycles.
PereeM
A
T \ 9.3 Ifforgings aretobeheat treated bythepurchaser,
Min Max themanufacturer shall supply along withtheforgings,
(1) (2) (3) representative testsamples together withdetailsofheat
Copper 3.9 5.0 treatment cycle.
Magnesium .0.2 0.8
Silicon 0.5 0.9 NOTE—Iftimedelayisnecessarytoaccommodateoperations
like straightening,cold compression andIevellingetc. the
Manganese 0.4 1.2
quenchedpastsshallberefrigeratedat–5to-15°C upto48h.
Titanium 0.15 However,operationistobecompletedwithin2houraofrentov-
Titanium+Zirconium 0.2 ingfmmcoldstorageandattainingmomtemperature.
Imn 0.5
Zinc — 0.2 10 MECHANICAL PROPERTIES
Tin — 0.05 10.1 Tensile Test
Chromium 0.1
Nickel — 0.2 10.1.1 The tensile test is to be carried out .as per
Lead — 0.05 IS 1608on the heat treated forged bar/forging stock
Others: test specimens prepared in accordance with relevant
Each — 0.05 clauses of IS 7674, shall conform to the values given
Total — 0.15 inTable 2.
Remainder
10.1.2 Unless otherwise agreed to,the test specimen
8CONDITION OF SUPPLY shall be taken in the longiiudimd direction or along
thegrain shallconform tothe values given inTable 2.

8.1 Forging Stocks

10.1.3 Unless otherwise agreed to, mechanical
Unless otherwise stated in the drawing or purchase
properties obtained from test specimens taken in
order, the forging stocks shall be straightened and
directions other than longitudinal in the case of
supplied in ‘as manufactured’ condition (M).
forgings are given in Table 3.
8.2 Forgings
10.2 Hardness
Unless otherwise stated in the drawing or pum-base
10.2.1 The Brinel} hardness test shall be carried out
order, forgings shall be supplied in solution treated
aaperIS 1500 onforgings andforgedtestpieces(using
and precipitation treated condition (T6). P/LY= 10).
9H13ATTREATMENT 10.2.2 The hardness of forging stock and forgings,
heat treated asper 9 shall not be lessthan 134HB or
9.1 Unless otherwise stated in the drawing or
as agreed to between the purchaser and the
purchaser order, the forging stm”kand forgings shall
manufacturer.
be heat treated as undec
a) Solutkm treatment by heating at a tempera- 11DIMENSIONS AND TOLEF&WtCES
tureof500* 5“C,soakforsufficienttimeand
11.1 Dimensions of the forging stock and forgings
quench in water at 40-70 ‘C,
shall be as agreed to between the purchaser and the
NOTE—Quenchinginsolutiontreatmentmaybe~“ed manufacture.
outattemperaturehigherthan70”C,ifagreedtobetween
thepurchaserandmanufactures. 11.2 Unlessotherwise agreedtobetween thepurchaser
b) Precipitation treatment atatemperature 160 - and the manufacturer, tolerances on the dimensions
2
IS 7902:2001
Table 2 Mechanical properties
(Clauses 10.1.1 and 10.1.2)
Material TestSample DiameterorMinor 0.2Percent Tensile Elongation,Min onGauge
Represented Preparedby SectionalDimenekm ProofStr*Min Streng@Min Length
OfFrgingStock * * T
50mm 5.65&
over upto& MPa MPa
including
mm mm
(1) (2) (3) Q) (5) (6) (7) (8)
Extrudedforging Machining o 10 380 430 6 —
fromextmded 10 20 400 430 6 6
stock 20 75 420 460 — 6
75 150 390 430 — 5
150 200 350 400 — 5
Extrudedforging
stock forging 1
madefrom.
Forging AllSk? 395 450 6 6
CastBillets }
HotRolled plate
ExtrudedStock
Table 3 Mechanical Properties
(Clause 10.1.3)
(For information only)
Dimensions ofForging 0.2%ProofStress TensileStrength %EtomgationonGauge
Dia/Thickness Length 5.65.&
A
{ *
Over .Upto& Min Min Min
including
mm mm MPa MPa
(1) (2) (3) (4] (5)
o 100 370 435 3
100 2001) 350 395 3

‘Generallyhandforgings.

NOTE—Incasehotwaterquench(excce dng 70”C)isusedinsolutiontreatment strengthvatueacouldhelower.
ofthe forging stock and forgings shall conform tothe IS 3664 and dye penetrant test asper IS3658 shallbe
requirements of IS 7674. carried outontheforging stockandforgings, toensure
that the material is free from hartnfid defects.
12QUALITY ASSURANCE
12.2.2 Macro and Micro-Examination
12.1 Inspection and Testing
If so desired by the purchaser, macro and micro
12.1.1 The purchaser shall be given full opportunity
examination shall becarried onthe samples selected.
to inspect/test the material at any time/stage of
Grain flow patterrt on macro etched sections of the
manufacture.
forgings shall conform to those indicated on the
12.1.2 The forging stock and forgings shall be drawing/test sheet or as agreed to. The micro
inspected and tested asper the requirements given in examination shall reveal satisfactory structure, free
the IS 7674, from inclusions and heterogeneity etc.
12.1.3 The manufacturer shall supply a copy of 13 RETEST
work’s analysis, ifdesired by thepurchaser.
13.1 In the case of failure of the material inany test,
12.2 Special Tests acceptancelrejection shall be based on the results of
retests conducted asper IS 7674.
12.2.1 Ultrasonic and Dye Penetrant Tests
13.2 Any material can be rejected for faults in
If so desired by the purchaser, ultrasonic test as per

3
IS 7902:2001
manufacture although it may have passed chemical order, the type of packing and gross weight of
and mechanical tests. individual package will be left tothe discretion ofthe
supplier. Each package shall contain only one size,
13.3 Forging stock and forgings shall conform to
alloy or temper material when packed for dispatch.
dimensions and tolerances, chemical composition,
Unless otherwise agreed upon.
mechanical properties and hardness requirements.
Forging stock and forgings not meeting the
16 MARKING
requirement shall be rejected.
16.1 Unless otherwise agreed upon or mentioned in
14 TEST CERTIFICATE thepurchase order, eachpackage shallbemarked with
the details as given in IS7674.
All supplies shall be accompanied by the certificates
for freedom from defects, non-destructive tests, 16.1.1 The material may also be marked with the
chemical composition, heat treatment carried out if Standard Mark.
any, mechanical properties, hardness as laid down in
16.1.2 The use of Standard Mark isgoverned bythe
the relevant clauses of this standard or asrequired by
provision oftheBureauofZndianStandardsAct, 1986
the drawing or test sheet.
andtheRules andRegulations made there under. The
1:}PACKING details of the conditions under which the licence for
the use of the Standard Mark may be granted to
The forging stockand forgings shallbepacked insuch manufacturers or producers may be obtained from
amanner soastoprevent damage inordinary handling the Bureau of Indian Standards.
and transportation. Unless otherwise mentioned in

4
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harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.
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Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also
reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that
no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users
of Indian Standards should ascertain that they are in possession of the latest amendments or edition by
referring to the latest issue of ‘BIS Handbook’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc : No. MTD 7 (4064).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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