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है”ह”ह

IS 7902 (2001): Aluminium alloy forging stock and forgingsfor aircraft purposes (Alloy 24345) [MTD 7: Light Metalsand their Alloys]

IS 7902:2001

m’dhw=m

Indian Standard

ALUMINIUM ALLOY FORGING STOCK ANDFORGINGS (ALLOY 24345) FOR AEROSPACE

APPLICATIONS — SPECIFICATION(First Revision )

ICS 49.025.15; 77.120.10

G BIS 2001

BUREAU OF INDIAN STANDARDSMANAK 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 finalizedby Light Metals and Their Alloys Sectional Committee had been approved by the Metallurgical EngineeringDivision Council.

This standard was first published in 1975. While reviewing this standard in light of experience gained duringthese years, the Sectional Committee decided to revise the standard.

Forgings of A1-Cu-Mg-Si-Mn alloy are widely used for aircraft structural fittings and components. This standardis prepared to specify the requirements for forgings stock and forgings.

In this revision, the alloy composition, mechanical properties have been rationalized and generally brought inpar with following International Aerospace Specifications, while keeping in view indigenous manufacturingpractices.

AU4SG(IGC. 04-32-044)

BS 2L 77:1971

Gost 4784:1974

QQ-A-367H

AIR 905 1A

AFNOR A7-4SG (2014)

WL 3.1254

Standard extrusions bars — Sud Aviation. (French specification).

Specification for forgings stock and forgings of aluminium-copper-magnesium-silicon-manganese alloy (solution treated and precipitationtreated). British Standards Institution.

Wrought aluminium and aluminium alloy. Grade-AK8 (Russianspecification).

Aluminium alloy forgings (Alloy 2014). Federal Specification USA.

General acceptance requirements of semi-finished products in aluminiumalloys for forgings.

Ministry of Defence. France.

Teil 1 (May 1988) Aerospace: Wrought aluminium alloy 4.5 Cu -0.9Si -0.8 M; -0.5 “Mg(hand forgings) German standards.

For the purpose of deciding whether a particular 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 withIS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe 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 ANDFORGINGS (ALLOY 24345) FOR AEROSPACE

APPLICATIONS — SPECIFICATION(First Revision )

1 SCOPE

This standard covers the requirements of aluminium- copper - magnesium - silicon - manganese alloy(Alloy 24345) forging stocks (billets, bars, rods,sections) and forgings. The material is intendedprimarily for aircraft structural parts requiringmoderate strength.

2 REFERENCES

The following Indian Standards contain provisionswhich through reference in this text, constituteprovision of this standard. At the time of publication%the editions indicated were valid. All standards aresubject to revision and parties to agreements based onthis standard are encouraged to investigate thepossibility of applying the most recent dltions of thestandards indicated below

IS No.23:1980

504:1963

1500:1983

1608:1995

3658:1999

3664:1981

5047(Palt 1):1986

7674:1975

10259:1982

TitlePrimary aluminium ingots forremelting for aimraftpurposes (thirdrevision)Methods of chemical analysis ofahnninium and its alloys (revised)Method for Brinell hardness test formetallic materhds (second revision)Mechanical testing of metals —Tensile testing (second rewkion)Code of practice for liquid penetrantflaw detection (second revirion)Code of practice for ultrasonic pukeecho testing by contact andimmersion methods (/irst revision)Glossary of terms relating to alu-minium and aluminium alloys:Part 1 Unwrought and wroughtmetals (second revirion)Procedure for inspection and testingof alurninium and aluminium alloyforging stock and forgings foraircraft purposesGeneral conditions for delivery andinspection of aluminium andaluminium alloy products

3 TERMINOLOGY

3.1 For the purpose of this standard the definitions asgiven in IS 5047 (Part 1), IS 7674 and the followingshall apply.

3.1.1 Approved Scrap

The scrap which is derived tlom manufacturer’s ownproduction from approved material, ingots andcastings etc, where in the material composititm hasbeen established with regard to both alloying elementsand impurities to the relevant specification segregatedand identified to -the satisfaction of inspectingauthority.

3.1.2 &t (Melt)

The product of either one furnace melt or a numberof tirnace melts where such are aggregated and mixedprior to sampling or pouring.

3.1.3 Extrusion Billet

A solid or hollow cast billet for extrusion to solid orhollow shapes and sections.

3.1.4 Harmful Defects

Any defect prejudicial tu subsequent manufacture,-fabrication or any use of material.

3.1.5 Work’sAnalysis

The routine analysis carried out by the m~ufacturerin order to control the quality of the material.

4 SUPPLY OF MATERIAL

General requirements relating to the supply of materialshall conform to IS 10259.

5 MANUFACTURE

The alloy made from primary or virgin aluminiumshall comply to the requirements of IS 23. Unlessotherwise agreed to, the selection of alloying elements,whether it is approved scrap or no$ shall be left to thediscretion of the manufacturer.

6 FREEDOM FROM DEFECTS

Forging stock and forgings shall be of uniform quality,sound and free from harmfid defects.

1

IS 7902:2001

7 CHEMICAL COMPOSITION

The material when analyzed as per IS 504 or anyother established instrumental/chemical method shallconform to the requirements as given in Table 1. Incase of dispute, the procedure given in IS 504 shallbe the referee method. However when the method isnot given in IS 504 the ~eferee method shall be asagreed to between the purchaser and the manufacturer.

Table 1 Chemical Composition

(Clause 7)

(1)

Copper

Magnesium

Silicon

Manganese

Titanium

Titanium+Zirconium

Imn

Zinc

Tin

Chromium

Nickel

Lead

Others:

Each

Total

PereeM

T A \Min Max

(2) (3)

3.9 5.0

.0.2 0.8

0.5 0.9

0.4 1.2

0.15

0.2

0.5— 0.2— 0.05

0.1— 0.2— 0.05

— 0.05— 0.15

Remainder

8 CONDITION OF SUPPLY

8.1 Forging Stocks

Unless otherwise stated in the drawing or purchaseorder, the forging stocks shall be straightened andsupplied in ‘as manufactured’ condition (M).

8.2 Forgings

Unless otherwise stated in the drawing or pum-baseorder, forgings shall be supplied in solution treatedand precipitation treated condition (T6).

9 H13AT TREATMENT

9.1 Unless otherwise stated in the drawing orpurchaser order, the forging stm”k and forgings shallbe heat treated as undec

a) Solutkm treatment by heating at a tempera-ture of 500* 5“C, soak for sufficient time andquench in water at 40-70 ‘C,

NOTE— Quenching in solution treatment maybe ~“edout at temperature higher than 70”C, ifagreed to betweenthe purchaser and manufactures.

b) Precipitation treatment at a temperature 160-

2

190 “C followed by cooling in air. Tempera-ture and duration which have been foundappropriate are as given below:

Temperature Durationin ‘C in h

160 12-20

175 9-12

190 3-6

9.2 Unless otherwise agreed to between the purchaserand manufacturer, the heat treatment (solutiontreatment and precipitation treatment) is limited tomaximum two heat treatment cycles.

9.3 If forgings are to be heat treated by the purchaser,the manufacturer shall supply along with the forgings,representative test samples together with details of heattreatment cycle.

NOTE— If timedelay is necessaryto accommodateoperationslike straightening, cold compression and Ievelling etc. thequenched pasts shall be refrigeratedat–5to-15°C up to 48 h.However,operationis to be completedwithin 2 houra ofrentov-ing fmm cold storage and attaining mom temperature.

10 MECHANICAL PROPERTIES

10.1 Tensile Test

10.1.1 The tensile test is to be carried out .as perIS 1608 on the heat treated forged bar/forging stocktest specimens prepared in accordance with relevantclauses of IS 7674, shall conform to the values givenin Table 2.

10.1.2 Unless otherwise agreed to, the test specimenshall be taken in the longiiudimd direction or alongthe grain shall conform to the values given in Table 2.

10.1.3 Unless otherwise agreed to, mechanicalproperties obtained from test specimens taken indirections other than longitudinal in the case offorgings are given in Table 3.

10.2 Hardness

10.2.1 The Brinel} hardness test shall be carried outaaper IS 1500 on forgings and forged test pieces (usingP/LY = 10).

10.2.2 The hardness of forging stock and forgings,heat treated as per 9 shall not be less than 134 HB oras agreed to between the purchaser and themanufacturer.

11 DIMENSIONS AND TOLEF&WtCES

11.1 Dimensions of the forging stock and forgingsshall be as agreed to between the purchaser and themanufacture.

11.2 Unless otherwise agreed to between the purchaserand the manufacturer, tolerances on the dimensions

IS 7902:2001

Table 2 Mechanical properties

(Clauses 10.1.1 and 10.1.2)

Material Test SampleRepresented Prepared by

Diameter or MinorSectional Dimenekm

OfFrging Stock

0.2 PercentProof Str*Min

TensileStreng@Min

(1) (2)

Extruded forging Machiningfrom extmdedstock

Extruded forgingstock forging 1made from.

}Forging

Cast BilletsHot Rolled plateExtruded Stock

over

mm

(3)

o

10

2075

150

upto&including

mmQ)

1020

75

150

200

All Sk?

MPa

(5)

380400420390350

395

MPa

(6)430430460430400

450

Elongation, Min on Gauge

Length** T

50 mm 5.65&

(7) (8)

6 —

6 6— 6— 5— 5

6 6

Table 3 Mechanical Properties

(Clause 10.1.3)(For information only)

Dimensions of Forging 0.2% Proof Stress Tensile Strength % Etomgationon Gauge

Dia/Thickness Length 5.65.&A

{ *

Over .Upto& Min Min Min

includingmm mm MPa MPa(1) (2) (3) (4] (5)o 100 370 435 3

100 2001) 350 395 3

‘Generally hand forgings.

NOTE— In case hot water quench (exccedng 70”C) is used in solution treatment strength vatueacould he lower.

of the forging stock and forgings shall conform to therequirements of IS 7674.

12 QUALITY ASSURANCE

12.1 Inspection and Testing

12.1.1 The purchaser shall be given full opportunityto inspect/test the material at any time/stage ofmanufacture.

12.1.2 The forging stock and forgings shall beinspected and tested as per the requirements given inthe IS 7674,

12.1.3 The manufacturer shall supply a copy ofwork’s analysis, if desired by the purchaser.

12.2 Special Tests

12.2.1 Ultrasonic and Dye Penetrant Tests

If so desired by the purchaser, ultrasonic test as per

3

IS 3664 and dye penetrant test as per IS 3658 shall becarried out on the forging stock and forgings, to ensurethat the material is free from hartnfid defects.

12.2.2 Macro and Micro-Examination

If so desired by the purchaser, macro and microexamination shall be carried on the samples selected.Grain flow patterrt on macro etched sections of theforgings shall conform to those indicated on thedrawing/test sheet or as agreed to. The microexamination shall reveal satisfactory structure, freefrom inclusions and heterogeneity etc.

13 RETEST

13.1 In the case of failure of the material in any test,acceptancelrejection shall be based onretests conducted as per IS 7674.

13.2 Any material can be rejected

the results of

for faults in

IS 7902:2001

manufacture although it may have passed chemical

and mechanical tests.

13.3 Forging stock and forgings shall conform todimensions and tolerances, chemical composition,mechanical properties and hardness requirements.Forging stock and forgings not meeting therequirement shall be rejected.

14 TEST CERTIFICATE

All supplies shall be accompanied by the certificatesfor freedom from defects, non-destructive tests,chemical composition, heat treatment carried out ifany, mechanical properties, hardness as laid down inthe relevant clauses of this standard or as required bythe drawing or test sheet.

1:} PACKING

The forging stock and forgings shall be packed in sucha manner so as to prevent damage in ordinary handlingand transportation. Unless otherwise mentioned in

order, the type of packing and gross weight ofindividual package will be left to the discretion of thesupplier. Each package shall contain only one size,alloy or temper material when packed for dispatch.Unless otherwise agreed upon.

16 MARKING

16.1 Unless otherwise agreed upon or mentioned inthe purchase order, each package shall be marked withthe details as given in IS 7674.

16.1.1 The material may also be marked with theStandard Mark.

16.1.2 The use of Standard Mark is governed by theprovision of the Bureau ofZndian Standards Act, 1986and the Rules and Regulations made there under. Thedetails of the conditions under which the licence forthe use of the Standard Mark may be granted tomanufacturers or producers may be obtained fromthe Bureau of Indian Standards.

4

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring 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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