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“जान का अधकार, जी का अधकार” “परा को छोड न तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New”

IS 23 (1980): Primary Aluminium Ingots for Remelting for Aircraft Purposes [MTD 7: Light Metals and their Alloys]

“ान एक न भारत का नमण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge”

“ान एक ऐसा खजाना जो कभी चराया नह जा सकताह ै”ै Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen”

IS : -23-1980

Indian Standard SPECIFICATION FOR PRIMARY ALUMINlUM INGOTS FOR REMELTING FOR AIRCRAFT PURPOSES ( Third Revision )

Light Metals and Their Alloys Sectional Committee, SMDC 10

Chairman Representing SHRI B. K. MURTHY Indian Aluminium Co Ltd, Calcutta

Members SHRI V. D. AGARWAL Aluminium Corporation of India Ltd, Calcutta SHRI V. K. AGRAWAL Hindustan Aluminium Corporation Ltd, Renukoot, Dist Mirzapur SHRI K. L. BARUI National Test House, Calcutta SHRI PREM BAVEJA Hindustan Aeronautics Ltd ( Bangalore Division ), Bangalore SHRI R. KLJPPASWAMY( Alternate ) SHRI S. N. CHATTERJEE Directorate of Technical Development and Produc- tion ( Air ), New Delhi CHEMIST& METALLURGIST Integral Coach Factory Perambur, Madras SHRI D. M. DAVAR Premier Automobiles Ltd, Bombay SHRI A. T. BORATE ( Alternate ) SHRI P. U. DEORA Cable and Conductor Manufacturers’ Association of India, New Delhi SHRI B. R. DUTTA The Institute of Indian Foundrymen, Calcutta SHRI A. GUHA ( Alternate ) SHRI N. GOPALKRISHNAN Indian Aluminium Co Ltd, Calcutta SHRI A. K. H.4JRA ( Alternate ) SHRI F. A. A. JASDANWALLA Indian Standard Metal Co Ltd, Bombay SHRI C. CHATTERJEE( Alternate ) JOINT DIRECTOR ( MET )-PM, Ministry of Railways RDSO, LUCKNOW CHEMIST& METALLURGIST EASTERNRAILWAY, JAMALPUR( Alternate I ) DEPUTY DIRECTOR, STANDARDS ( CARR )-II, RDSO, LUCKNOW ( Alternate II ) SHRI P. M. JOSEPH Aluminium Industries Ltd, Madras SHRI M. K. JOSHI Ministry of Defence ( R & D ) SHRI I. N. BHATIA ( Alternate ) SHRI M. L. KAUL Bharat Aluminium Co Ltd, New Delhi LT-COL 0. N. BHAN ( Alternate ) SHRI S. L. KHANNA Ministry of Defence ( DGI ) SHRI M. Y. BORKAR ( Alternate) ( Continued on page 2 )

6 Copyright 1981 INDIAN STANDARDS INSTITUTION This publication is protected under the Indian Copyright Act (XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. IS:23-1980

( Continuedfrom page1) Members Representing DR D. KUMAR Malaviya Regional Engineering College, Jaipur DR R. KUMAR National Metallurgical Laboratory ( CSIR ) Jamshedpur DR MANJIT SINGH ( Alternate ) SHRI 0. P. MATHUR Electrical Manufacturing Co Ltd., Calcutta SHRI I,. MISHRA Directorate General of Technical Development, New Delhi SHRI B. D. BISWAS Ministry of Defence ( DGOF ) SHRI U. MOHAN RAO Bharat Heavy Electricals Ltd, DR K. K. SEN GODAN ( Alternate) SHRI K. R. RAGHUNATH Jindal Aluminium Ltd , Bangalore SHRI R. RAMDAS India Government Mint ( Ministry of Finance ), Hyderabad REPRESENTATIVE Planning Commission, New Delhi REPRESENTATIVE Ministry of Steel and Mines SHRI M. S. SESHADRI Indian Pistons Ltd, Madras SHRI D. H. SHAH Jeewanlal ( 1929 ) Ltd, Calcutta SHRI N. H. SHAH ( Alternate ) SHRI N. SHANMUGHAM Madras Aluminium Co Ltd, Mettur Dam SHRI B. A. SHENOI Central Electrochemical Research Institute ( CSIR ), Karaikudi SHRI P. S. DEsrK.4N ( Alternate ) SHRI K. M. TANEJA Diregctfrite General of Supplies & Disposals, New

SHRI S. B. GUPTA ( Alternate ) SHRI C. R. RAMA RAO, Director General, IS1 ( Ex-ofi& Mcmbrr ) Director ( Strut & Met ) Secfetal;y SHRI B. MUKHERJI Deputy Director ( Metals ), ISI

IS:23-1980 Indian Standard

SPECIFICATION FOR PRIMARY ALUMINIUM INGOTS FOR REMELTING FOR AIRCRAFT PURPOSES ( Third Revision)

0. FOREWORD

0.1This Indian Standard ( Third Revision ) was adopted by the Indian Standards Institution on 30 September 1980, after the draft finalized by the Light Metals and Their Alloys Sectional Committee had been approved by the Structural and Metals Division Council. 0.2 This standard was first published in 1950 as a tentative standard and subsequently revised in 1959 and 1965. In the present revision, the following modifications have been incorporated: a) Requirements of 99’8 percent aluminium have been included, b) Total impurity limits for the different grades have been specified, c) Requirements for marking, packing and shipping have been modified, and d) Materials have been designated in the digital system in accord- ance with IS : 6051-1970*. 0.3 For the puipose 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 accord- ance with IS : 2-1960 . The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE 1.1This standard covers requirements for 99, 99’5, 99’7 and 99’8 percent primary aluminium notched bars and ingots for remelting, for aircraft purposes.

*Code for designation of aluminium and its alloys, +Rules for rounding off numerical values ( rwiscd ).

3 IS : 23 - 1980

2. TERMINOLOGY 2.0 For the purpose of this standard, the following definitions shall apply. 2.1 Cast - A ‘cast’ shall be defined as one of the following: a) The product of one furnace melt, b) The product of one crucible melt, c) The product of a number of furnace or crucible melts mixed prior to casting, d) The amount of melt tapped from the furnace without any further addition having been made when a continuous melting process is employed for the production of ingots, and e) As may otherwise be defined by the inspecting authority. 2.2 Approved Scrap - Scrap which is: a) derived from material the composition of which has been esta- blished with regard to the complete range of both the alloying elements and impurity elements appropriate to the class of the material being made; and b) segregated and identifiable to the satisfaction of the inspecting authority.

3. SUPPLY OF MATERIAL 3.1 General requirements relating to the supply of primary aluminium notched bars and ingots for remelting for aircraft purposes shall be as laid down in IS : 1387-1967*.

4. MANUFACTURE

4.1 The material shall be produced by reduction of alumina by electric smelting or reduction furnace, and shall be cast into notched bars or ingots. 4.2 Approved scrap may be used for the production of the metal at the discretion of the manufacturer.

5. FREEDOM FROM DEFECTS 5.1 The ingots shall be clean with no traces of overflows, poor pouring, slag inclusions or dross.

*General requirements for the supply of metals and metal products ( revised ). 4 r

. IS : 23- 1980

6. CHEMICAL COMPOSITION 6.1 The chemical composition of the material when analyzed in accord- ance with IS : 504-1963* shall be as given in Table 1.

TABLE 1 CHEMICAL COMPOSITION

DFSIGNATION PERCENT r__----__----- h ____-__ ------7 Aluminium lron Silicon Copper Zinc Manga- Total nese Impurities Min MU Max Max MlZX MCTX

1900 99.0 0.60 0.50 0.03 0.06 0.05 1’0 1950 99.5 O-40 O-30 0’03 0.05 0’03 0.5 / 1970 99’7 0.25 0’20 0.02 0’03 0.03 0’3 1980 99’8 o-15 0’10 0’01 0’03 0.03 O-2 NOTE 1 - Aluminium shall be determined by difference. NOTE 2 - The manufacturer shall supply to the inspector, if required, the exact percentages of the specified elements present in every cast.

7. SHAPE AND SIZE 7.1 Notched bars and ingots should preferably be supplied in shapes and sizes conforming to IS : 1820-1963t.

8. IDENTIFICATION AND MARKING 8.1 All notched bars and ingots should bear the manufacturer’s mark, the number of cast and the mark of Inspector. Alternatively, the notched bars and ingots approved by the Inspector shall be wired in bundles, the necessary marks being stamped on a metal label, and the label being securely attached to each bundle. The method of packing for shipping shall be as per agreement between the manufacturer and the customer. 8.2 Each lot of aluminium being delivered should be accompanied with a test certificate, certifying that the delivered aluminium conforms to the requirements of this standard with identification of: a) manufacturer’s name, its location or address; b) grade of aluminium; c) chemical test results: and d) cast number.

*Methods of chemical analysis of aluminium and its alloys ( revised ). tRecommended shapes and sizes of aluminium notched bars and ingots for remelt- ing purposes. 5 IS : 23 - 1980 . 8.3 Notched bars and ingots may also be marked with the ISI Certifica- tion Mark. NOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act and the Rules and Regu- lations made thereunder. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by IS1 and operated by the producer. IS1 marked products are also continuously checked by ISI for conformity to that standard a as a further safeguard. Details of conditions under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution.

9. SELECTlON OF SAMPLES FOR ANALYSIS

9.1 At least one sample shall be selected at random by the inspector from appropriately 1 000 kg of metal cast. The minimum number of analysis required may be increased by the inspector if he is not satisfied with the conditions of manufacture. 9.2 Wherever possible, samples shall be taken directly from the stream of metal filling the moulds, midway through the pour. Samples shall be heavily chill cast preferably of dimensions 150 x 50 ~6 mm, unless special spectrographic samples are made. All samples shall be suitably marked with the identity of the cast they represent. 9.3 Where for special reasons samples are required for ingots or notched bars, samples shall be obtained by milling or other suitable method and shall be taken from throughout the thickness of the notched bar or ingot after the skin of the notched bar or ingot has been removed.

10. RETEST 10.1 If a sample selected for testing fails to meet the requirements of the specification, two further samples shall be taken from the same lot of metal. If either of these samples fails to meet the requirements of the specification, the whole of the metal represented shall be rejected.

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