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है”ह”ह

IS 6051 (1970): Code for designation of aluminium and itsalloys [MTD 7: Light Metals and their Alloys]

II-------- . c-_--

.

IS:6051-1970

Indian Standard ( Rerffirmed 1979 )

CODE FOR DESIGNATION OF ALUMINIUM AND ITS ALLOYS

( Third Reprint FEBRUARY 1996 )

UDC 669.71:003.62

0 Copyright 1971

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 0AHADUR SHAH ZAFAR MARC

NEW DELHI 110002

Gr 3 Jub 1971

IS : 6051.1970

Indian Standard CODE FOR DESIGNATION OF

ALUMINIUM AND ITS ALLOYS

Light Metals and Their Alloys Sectional Committee, SMDC 10

Chairmm Representing

SHRI R. K. MURTHY Indian Aluminum Co Ltd, Calcutta

Members

SERIV. D AQAR~AL The Aluminium Corporation of India Ltd, Calcutta SHRI V. K: AQR~WAL Hindustan Aluminium Corporation Ltd, Renukoot,

Mirzapur SHRI N. C. BAQCHI National Test House, Calcutta DR V. CHANDNA~EKHAR Ministry of Defence ( R & D )

SHRI P. K. MAHAPATRA f Alternate 1 SHRX C. CHATTERJEE SHRI D. D. CHOU~DHUHY

DEP~JTY DIRECTOR RESEARCH ( MET )-2, RDSO, CHITTARAN- JAN

CHEMIST & MBTALLURGIST, NORTHEASTERN RAILWAY, GOKAKHPUR ( Altsmatc)

SHKI P.K.GANGopADHyAy

The Indian Standard Metal Co Ltd, Bombay Directorate of Technical Development & Production

( Air ), Air Headquarters Ministry of Railways

Ministry of Defence ( DGI ) \ SHRI D. 5. MUKH~U~E ( Alternare ) SHRI N. GOPALKRISHNAN Indian Aluminium Co Ltd, Calcutta SHHI OM KHOSLA Electrical Manufacturing Co Ltd, Calcutta

SWKI 0. P. MATHUR ( Alternate) SHRI D. Y. MOQHE

SHRI B. S. SETR ( Alternate ) SHRI D.C. MUEHEHJEA

SHICI S. PEER MOHAMMED SHRI P. M.JOSEPH (Alternate)

SHR~K.N.RAM.~RWAMY SHRI B. N. BISWA~ (Alternate)

SHRI D. K. RAY

SHRI J. P. SEN ( Alternate )

Director General of Ordnance Factories ( Ministry of Defence ), Calcutta

India Government Mint ( Ministry of Finance ), Hyderabad

The Aluminium Industries Ltd, Kundara

Bharat Heavy Electricals Ltd, Hyderabad

Directorate General of Supplies & Disposals, New Delhi

Jeewanlal (1929) Ltd, Calcutta SHRI D.H. SHAH SHRI P. K. &BANI (Alternate j

SHKI M. B. SHANKAR Hindustan Aeronautics Ltd, Bangalore SHRI K. B. NABHIRAJ ( Alternnle)

( Continued on page 2 )

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SIIAII ZAFAR MARC

NEW DELI11 110002

IS:6051-1970

( Continued from page 1)

Members

DR Y. N. TI~EHAN

SHRI V. V. VIKABHAI>RAY~-A

Representing

National Metallurgical Laboratory Jamshedpur

(CSIR ),

Directorate General of Technical Development, New Delhi

SHILI B. P. SINHA ( .illerrmfc ) SHHI R. K. &WASTAVA, Director General, ISI ( Ex-oficio Mrmbrr )

Deputy Director ( Strut & hlet )

SHBI S. L. BALI

Deputy Director ( Metals), 181

Panel for Aluminium Designations, SMDC 10/P-12

Convener

SHRT M. B. SLTANUAK

Members

SHKI V. K. AQ~~AWAL

SHRI N. GOPALXRISHNAN

Hindustan Aeronautics Ltd, Bangalore

Hindustan Aluminium Corporation Ltd, Renukoot, klirzapur

Indian Aluminium Co Ltd, Calcutta

2

Indian Standard CODE FOR DESIGNATION OF

ALUMINIUM AND ITS ALLOYS

IS-:6051-1970

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 7 December 1970, 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 Formulation of a fundamental and rational designation system, for aluminium and its alloys, which is either suggestive or self-indicative of the approximate composition and type of the alloys, in view of diverse systems prevalent in different countries of the world, presented many problems. As a result of a critical’study and a series of exercises under- taken of designation systems so far prevalent, some based on digital and some on elemental percentage, the digital system was considered fairly simple and convenient for the most part. The designation system covered in this code not onLy offers clues to the type of alloys but also attempts to rationally group all the alloys. With this system, the designation of new ahoys which may be formulated in future will also be possible.

0.2.1 Although the five-and four-digit systems have been explained in the code by suitable examples given under relevant clauses, the existing aluminium and aluminium alloy designations have been translated into the new alloy designations in Appendix A for ready reference, Also titles of the Indian Standards referred to in this code are given on page 10.

0.3 For the purpose of rounding off, rules as described in IS : 2-1960* shall be applicable.

1. SCOPE

1.1 This code prescribes method for designating aluminium and its

alloys, namely, wrought aluminium alloys, aluminium (un-alloyed ), casting alloys, castings ( unalloyed ), and primary ingots.

*Rules for rounding off numerical values ( mired ).

3

IS I 6051-1970

2. IDENTIFICATION OF ELEMENTS

2.1 Elements shall be identified by the group number indicated against each in Table 1.

TABLE 1 ELEMENT NUMBER DESIGNATIONS

ELFNLIENT GROUP NUYBEB

Un--4ftpljed Aluminium ( Wrought and Cast

Copper

Manganese

Silicon

Magnesium

Magnesium Silicide ( Mg,Si )

Zinc

Other Elements (such as, Nickel, Titanium, ( Chromium, Lead, Bismuth, etc )

Unassigned

1

9

3. FIVE- AND FOUR-DIGIT SYSTEMS

3.0 The new alloy designation system for aluminium and its alloys is based on a ‘Five-Digit System’ for wrought aluminium alloys, aluminium (un-alloyed) and a ‘Four-Digit System’ for casting alloys, castings (un-alloyed j and primary ingots. _

FIVE-DIGIT

3.1 Wrought Aluminkm Alloys,

First Digit Second Digit

First Digit Second Digit indicates identifies rounded off mean value the Major of the percentage of Alloying the Major Alloying Element E 1 e m e n t, except for

4

SYSTEM

Third, Fourth and Ffth Lkgrts

Third, Fourth and Fifth Digits identify the Minor Alloying Elements in the descending order of their percentage and in the case of same alloy percentage

ls : 605S- 1976

22&i, F&n and F$th Digi&‘

in the serial order (see new desigt nation for H 12 ), except for Group 6 containing the intermetallic compound (Mg&) when the Third Digit refers to either Mag- nesium or Silicon which is in ex- cess of that required ,for Magne- sium Silicide (that is 1.7 which is the ratio. of Mg to Si). For balanced compositions, the Third Digit will be zero

In case of High Purity Aluminium Base Alloy, the Fifth Digit will be 1

First Digit Second Di&t

Group 4 containing Silicon, when the digit refers to the mean percentage halved and rounded off; and for Group 6 ‘containing Magnesium the digit

Silicide, refers to

five times. the mean Mag- nesium percentage rounded off

Examfiles:

Alloying Elements and Their Old Designation Mean Percentages

Cu 1.5, Si 1.0, Mg 0.85 Hll Mn 1.2 Si 5-2 %l Mg 4.4, Mn O-75 N8 Mg 065, Si O-50 H9 Mg O-65, Si O-50 (EC Grade) 91E Mg O-95, Si 0.95 H19

3.2 Wrought AIumininm ( Un-Alloyed )

New Design&on

22450 31009 43000 54300 63400 6340 1 65400

First Digit Second Digit Third and Fourth Fifth Digit Digits

First Digit is al- Second Digit is Third and Four- Fifth Digit indi- ways shown as 1 always shown as th Digits indi- cates Variants if representing Un- 9, the unit digit cate the decimal any. Example: Alloyed Alumi- of 99 minimum purity percen- EC Grade Alu- nium* (Wrought) purity percen- tage

tage

Examples:

Aluminium Purity, Percent Old Designation

Al 99.99 Al 99.5 :I3 Al 99.5 ( EC Grade) 1E of IS: 5082- 1969 Al 99.0 IC

*Un-Alloyed aluminium by convention or definition is aluminium.

minium shown as 1

New Designation

19990 19500 19501 19000

not less than 990 percent

5

Isr6@51-1970

FOUR-DIGIT SYSTEM

3.3 Casting AUoyf~

First Digit second Dig@ ‘Third and Fourth ‘Digits

FirstDigit Second Digit indicates Third and Fourth Digits identify identifies the mean value percen-

tage of the Major Alloy- the Minor Alloying Elements in

the Ma- ehe order of their decreasing per- jor Allo- ing Element halved and centage or in the case of same ying Ele- rounded off alloy percentage in the serial ment order (see new Designation for

A-l )

Examples:

Alloying Elements and Their Mean Percentages

Old Designation New Designation

Cu 9.8, Fe 1.0, Mg O-25 A-12 Si 10.2, CU 1.6 A-2 Si 11.5, Ni 3.0 A-17 Mg 10.2 A-10

3.4 Primary Ingots or Castings ( Un-Alloyed )

2585 4520 4680 5500

First Digit Second Digit Third Digit Fourth Digit

First Digit is al- Second Digit is Third Digit indi- Fourth Digit in- ways shown as always shown cates the deci- dicates Vari- 1 representing as 9, the unit ma1 purity per- ants if any. Ex- Un-Alloyed Al- digit of 99 mini- centage uminium* purity

ample: EC Gra- mum de Aluminium percentage shown as 1

Examples:

Aluminium Purity, Percent Old Designation

Al 99.6 - Grade 1 ( EC Grade) ( IS : 4026- 1969 )

Al 99.5 Grade 2 ( EC Grade) ( IS : 4026-1969)

New Designation

1961

1951

99.5 percent ( IS : 2590- 1964 )

1950

l Un-Alloyed aluminium by convention or definition is not less than 99.0 percent aluminium.

6

APPENDIX A (CZm4se 02.1 )

COMPARISON OF OLD AND NEW DESIGNATIONS

Wrought Alloys (IS : 733 to IS : 740, IS I 1284, IS t 1285 and IS : 3436)

ALUMINIUM PURITY, PERCENT OLD DESIGNATION NEW DESIGNATION

I9990 19800 19601

Al 99.99 Al 99.8 Al 99.6 ( EC Grade )

(IS:5484) Al 99.5 Al 99.5 (EC Grade)

(IS:1841, IS:2067) Al 99.5 (EC Grade) J&.50”“2 )

ALLOYING ELEMENTS AND THEIR MEAN PERCENTAGES

Al42 Alloys

Cu l-5, Si 1.0, Mg 0.85 Cu 2.3, Ni l,*O, Mg O-90,

Si 0.90, Fe 0.90 Cu 4.1, Mg O-80, Mn O-70,

Si 0.45 Cu 4.1, Mg 0.80, Mn O-70,

Si 0.45 Cu 4.3, Mn 0.75, Si 0.70, Mg O-50

Cu 4.3, Mn 0.75, & O-70, Mg O-G_l~

Cu 2.2, Mg 1.4, Ni 1.0, Fe 0.90

Al-Mn Alloy

Mn I.2

Al3 Alloys

Si Il.5 Si 5.2

1 1A -

1B -

1E

1C

19500 19501

19501

19000

Hll 22450 H12 22845

H14 24534

HC14 Alclad 24534

HI5 24345

HC15 Alclad 24345

H18 22588

N3 31000

$1

7

46000 43000

IS16051.1970

&&OYING ELEMENTS AND OLD DESIGNATIOM THHW MEAN PERCENTAGES

AL-MS Alloys Mg 2.2 N4 Mg 3.4 N5 Mg 5-O N6 Mg 7.0 N7 Mg 4.4, Mn 0.75 N8

Al-Mg-Si Alloys Mg 0.65, Si 0.50 H9 Mg O-65, Si 0.50 (EC Grade) 91E

(IS:5082) Mg 0.95, Si 0.95 H19 Mg 1.0, Si 0.60, Mn 0.50, Cu 0.28 H20 Mg 0.90, Si 0.95, Mn 0.70 H30

NEW DESIGNATION

52000 53000 55000 57000 54300

63400 63401

65400 65032 64430

Prixxiary Ingots(IS:23,IS:2590,IS:3435 and IS:4026)

ALUMINIUM PURITY, PERCENT

Al 99.7 99.7 percent Al 99-6 (EC Grade) Grade 1 Al 99’5 ( EC Grade ) Grade 2

99.5 percent 99.0 percent

Castings(IS:202andIS:617)

Al 99.0 A-O 1900

ALLOYING ELEMENTS AND THEIR MEAN PERCENTAGES

AI-Cu Alioys

CU 7.0, Si 3.0, Zn 3.0 Cu 4.5, Ti0.18 Cu 9.8, Fe 1.0, Mg 0.25 Cu 4.0, Ni 2.0, Mg 1.4 Cu 2.2, Si 1.3, Ni 1.2, Mg l-1, Fe 1.1, Ti O-18

cu 4.5

A-l 2447 A-11 2280 A-12 2585 A-14 2285 A-15 2148

Cu 4.5, Si 2.5 A-25 2200 A-26 2240

ALSi Alloys

Si 10.2, CU 1.6 Si 5.0, Cu 3.0, hln O-50

A-2 4520 A-4 4223

8

1970 1961 1951

1950 1900

Is 16951- 1970

ALLOYING ELEMENTS AND OLD DESI~JNATION THEIR MEAN PERCENTAGBS

Al-S Alloys

Si Il.5 ’ Si.4.a, Mg 055 Si 11~5, Mn 0.50, Mg 040 Si 12.0, Ni 2.5, Mg l-2, Cu @90 Si 5-0, Cu l-2, Mg @50 Si 11.5, Ni 3.0 Si 5.2 Si 50, Cu 3.3, Mn O-45 Si 8.5, CU 3.5 Si 7.0, Mg O-30

A-6 4600 A-8 4250 A-9 4635 A-13 4685 AL16 4225 A-17 4680 A-18 4300 A-22 4223 A-24 4420 A-27 4450

Al-Mg Alloys

Mg 4-5, Mn 0.50 A-5 Mg 10.2 A-10

NEW DESKSNATION

5230 5500

INDIAN STANDARDS

Aluminium and Its Alloys

IS:

23-1965 Primary (virgin ) aluminium notched bars and ingots for remelting for aircraft purposes ( smnd r&ion )

202-1966 Aluminium casting alloy i,ngots and castings for aircraft purposes (second

revision )

617-1959 Aluminium and aluminium alloy ingots and castings for general engineering purposes ( revised )

733-1967 Wrought aluminium and aluminium alloys, bars, rods and sections (for general engineering purposes ) ( jfst fevi&a )

734.1967 Wrought aluminium and aluminium alloys, forging stock and forgings ( for general engineering purposes ) (first revision )

736-1965 Wrought aluminium and aluminium alloys, plate ( for general engineering purpo’ses ) ( revised )

737-1965 Wrought aluminium and aluminium alloys, sheet and strip (for general engineering purposes ) ( revised )

738-1966 Wrought aluminium and aluminium alloys, drawn tpbe (for general engineering purposes ) ( r&cd )

739-1966 Wrought aluminium and aluminium alloys, wire (for general engineering purposes ) ( rcviscd )

740-1966 Wrought aluminium apd aluminium alloys, rivet stock (for general engineering purposes ) ( r&cd )

1284-1966 Wrought aluminium and aluminium alloys, bolt and screw stock (for general engineering purposes ) ( revised )

1285-1968 Wrought aluminium and aluminium alloys, extruded round tube and hollow sections ( for general engineering purposes ) (JFrsl revision )

1841-1961 Rolled aluminium rods ( electrical conductor grade ) for electrical purposes

2067-1962 Wrought aluminium for electrical purposes, wire (other than that used for overhead conductors )

2590-1964 Primary aluminium ingots for remelting for general engineering purposes

3435-1968 99 percent secondary aluminium notched bars and ingots for remelting for aircraft purposes

3436-1966 Aluminium-clad aluminium alloy sheet, strip and coil for aircraft purposes

4026-1969 Aluminium ingots ( EC Grade ) (first revision )

!jO&?-1969 Wrought aluminium and aluminium alloy bars, rods, tubes and sections for electrical purposes

5484.1969 FC Grade aluminium rod produced by continuous casting and rolling

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