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is.13352.1992 | Forging | Steel
is.13352.1992
Uploaded by mal singh
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IS 13352 (1992): Stock for forgings produced f rom
continuously bast billets , blooms, slabs and bars [MTD 16:
Alloy Steels and Forgings]
INDIAN'*WTANDARDS 9 NEW April BAHADUR S@bI ZAFAR MARG DELHI 110002 Price Group S 19% - ’ i .FOR FORGINGS PRODUCED FROM CONIXWOl_!SLY CAST BLOOMS. STOCM.29 ._.BILLETS AND SLABS.14.IL 13352: 1992 (Reaffirmed 2004) h&-w Standard .SPECIFICATION UDC 669.018. __ ..412 Q BIS 1992 BUREAU MANAK OF BHAVAN. _ ._~ .
expressing the result of a test or analysis. forging industry in the country used to get only ingots/semis as forging stock. forging units are getting billets. blooms. produced from con-cast route. With the installation of continuous casting facilities with a number of steel manufacturing plants. .Steel Forgings Sectional Committee. Keeping in view of this development. by the For the purpose of deciding whether a particular requirement of the standard is complied with. This standard would be of immense help to billets. shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. valuable assistance has been provided by TELCO. MTD 18 FOREWORD This Indian Standard was adopted by the Bureau of Indian Standards. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. In the preparation Jamshedpur. the forging industry who will use the above shapes produced from con-cast route as a raw material for the manufacture of automobile or other engineering components. the final value. an informative annex giving information to be furnished purchaser while ordering for steel to this standard. need was felt to formulate a nationa standard covering the technical and delivery conditions for plain carbon and low alloy grade steels in the form of bars. slabs etc. has been included as Annex A. observed or calculated. after the draft finalized by the Steel Forgings Sectional Committee had been approved by the Metallurgical Engineering Division Council. of this standard. etc. Till recently. produced from continuously cast route. For the benefit of the purchaser.
4 MANUFACTURE 4. 4.2 ) -.2 Sufficient discard shall be made from both end of each strand to secure freedom from defects. 1. 3 SUPPLY OF MATERIAL 3. 1 . Hardenability 3.1 The Indian Standards listed in Annex B are necessary adjuncts to this standard: 4. the processes used for making the steel shall be left to the discretion of the manufacturer. 2 REFERENCES 2.IS 13352 : 1992 hdian Standard STOCK FOR FORGINGS PRODUCED FROM CONTINUOUSLY CAST BLOOMS.3 The reduction ratio measured by cross section of the cast product to the forging stock should be at least 6 : 1.1 Maximum value X X X ) as annealed 3. etc. produced from continuously cast route either by rolling or by forging. billets. When so desired the purchaser and manufacturer may agree to a particular secondary steel making technology.2 The steels covered in this standard are in genera1 intended for use by the forging industry as a raw material for the manufacture of automobile or other engineering components. ABCDEFGHIJKLMNO Requirements 1. 3 For closer bands of hardenability and acceptance level of cleanliness by step clown test/Blue fracture test agreement should be made at the time of enquiry and order. Hardness: 3.1 General requirements of material shall conform 3. 1.BILLETS AND SLABS. Higher or lower reduction ratios for specific applications can be agreed to at the time of enquiry and order between the purchaser and the manufacturer. Crack testing x X x X X x X x X X x x X X X X X X X xxxxxx x NOTES 1 Other modes of delivery is justified by the quality and quantity requirements can be specially x agreed to at the time of enquiry and order. by this standard on any one of the basis shall be Table 1 Delivery Condition for Ordering Steel ( Clause 3. The stock should be free from any harmful internal defects as stipulated in 5.1 This standard covers the technical and delivery conditions for plain carbon and low alloy grade steels in the form of bars. Mechanical properties X X x X x X x X X X X X X X 5. ChemicalComposition ( Jominy 2.SPECIFICATION 1 SCOPE ordered and delivered given in Table 1. but the steel shall be fully killed. 2 For modes of delivery with mechanical properties/hardenabiIity guarantee.2 Steels covered relating to the supply to IS 1387 : 1967. minor variation from chemical composition as in Table 2 are permissible. Special cleanliness by step down/Blue fracture test 6.1 Unless otherwise agreed to in the order.2 Maximum value as rolled 4.
035. concentrated pin holes. The permissible variation of the check analysis from the limit specified in Table 2 shall be as given in Table 3. For acceptance criteria of the stock. 7 MECHANICAL PROPERTIES 5.30 0.1 The hardness and mechanical properties for respective grades will be as per IS 5517 : 1978 or IS 4432 : 1988. where method is not given in IS 228 and its relevant parts.25 0 05 0*0003 0. reference can be made to Fig. 6 CHEMICAL COMPOSITION 7. half way cracks. 6. Max 0. corner crack. Max 0. 7. etc. The hardness shall be determined in accordance with IS 1500 : 1983. and the remaining 25 percent of the grains falling either one size below or above the range but not spreaded at both ends of the range. 1 to arrive at a mutually acceptable limits of a certain type of defects present either singularly or in combination depending upon the subsequent manufacturing operation and the end use of the product. 2 Percent Copper + 10x Percent Tin shall not exceed 0. 8.05 NOTES 1 Trace elements ( Cc j. Constituent Percent.1 Ladle Analysis and Check Analysis The ladle analysis of steel shall be as given in Table 2.2 Method of determining the mechanical properties shall be in accordance with IS 1598 : 1977 and IS 1608 : 1972.02-O 035 O-035.30 0.50 percent.1 Unless otherwise agreed.1 Steel can be ordered in combination Sulphur and Phosphorus as given below: 5.1. or any other relevant Indian Standard for which the steel is intended. 5. 8. voids.Ni + MO ) when added together shall not exceed 0. Limit-I Limit-II of Phosphorous Percent 0.1 Surface and Sub-Surface Defects Sulphur.3 The transverse section of the rolled stock shall be suitably inspected by sulphur print/ macro etching as per IS 12037 : 1987/IS 11371 : 1985. The check analysis shall be carried out on the finished product.5 The forging stock should be by and large homogenous and free from large.2 Internal Defects 6. If necessary the continuously cast billet or bloom shall be suitably conditioned before rolling to ensure the product quality. 0. Max For other combinations of sulphur and phosphorus the agreement can be made at the time of enquiry and order.IS 13352: 1992 5 FREEDOM FROM DEFECTS 6. 8 GRAIN SIZE 8. segregated inclusions and macrostreaks when examined by macroetching the longitudinal section.3 The grain size shall be considered satisfactory if75 percent of grains are within the specified limit.4 The forging stock shall be free from coarse dendrities. 1. the referee method shall be as agreed to between the purchaser and the manufacturer. In case of any dispute the procedure given in IS 228 and its relevant parts shall be the referee method.2 Elements not specified in Table 2 shall not be added other than for the purpose of finishing the heat. flakes.035. 5.1. the steel when tested for grain size in accordance with IS 4748 : 1988 shall show grain size of 5 to 8 for inherently fine grained steel. However.05 0.2 Grain size outside the range of 5 to 8 may be supplied on mutual agreement. centre looseness. 2 .50 percent. and shall not exceed the following limits: The stock rolled/forged continuously cast steel shall also be free from harmful internal defects like. Max Chromium Nickel Molybdenum Copper Vanadium Boron Tin 5. Percent The stock rolled/forged continuously cast steel shall be free from harmful surface and sub-surface defects which may impair the forgeability and or the end use of the steel. The analysis of steel shall be carried out either by the method specified in IS 228 and its relevant parts or any established instrumental/chemical method. The customer will specify the acceptance criteria by defining the maximum defects permissible as per plate 1 and plate 2 of Fig. if so desired by the purchaser.
35 0.35-0.70 8.15-0.60-0.60 - 3.70 040.35 0.35 0.45-0.25 0.12.80 090-l .35 O*lO-0.50 0*30-max 0.25-2. - 0~07-0*120.12-0.44 15C8 2OC8 25C8 Mn (3) 0.90 0.08-0.12-0.35 0*15-0*35 0.15-0.80-1.35 o-10.15 0~10-0~20 0.18 0.35 0.40 0.80 060-0.35 O*lO-0.45-O-65 0~70-090 0.50 0.22-0.60-0.60-0.O-80 0. Percent ~___--_-----C (1) (2) 3OC8 35C8 45C8 55C8 65C6 15Cr3 16Mn5Cr4 20Mn5Cr5 14Cr6Ni6 15Ni5Cr4Mol 15Ni7Cr4Mo2 16Ni3Cr2 20Ni7Mo2 20Ni2Cr2Mo2 20Ni7Cr2Mo2 27C15 37c15 35Mn6Mo3 35Mn6Mo4 42Cr6Vl 45Cr36Si12 58Cr4Vl 5OCr4Vl 55Cr3 4OCr4 4OCr4Mo2 15CrlMo6 25Cr13Mo6 : 4OCr13MolOV2 4ONi14 35Ni5Cr2 30Ni16Cr5 4ONiCr4Mo2 40Ni6Cr4Mo3 3lNilOCr3Mo6 40NilOCr3Mo6 0~10-0~20 0.80-1.40 290-3-40 3JlO-3.90 0.75-1.OO-1.12-0.35 0.30 0.37-0.80 0~30-060 0.65 0.60-O-90 0~60-090 0.70 1.60-0. When this is necessary restricted ranges of carbon may be agreed to’ .45 o-35-0*45 0.07-0.10 l*OO-1~30 1-40-l -70 0.50 090-l 920 0%1.00 0. 5.47 040-0.35 2.65 1.35-0.25- 0~10-0~20 O-20-0.45 0.20-O-30 O-25-0.0*70 040.80 o-40-060 0.23 O-17-0.25-2.75 2.00 MO (6) - (7) - (8) - - - 0.20-360 1.50-0.02YO*05percent.90 060-090 060-0*90 0.32 0.35-0.75 l*lO-140 090-1.40-0.26. between the purchaser and the manufacturer.15-0.35 o-15-0.35 o-15-0.70 040-0.18-0.75 2. .36-0.45-0.15-0.75-1-25 040-0.70 1*OO-1.15-0.35 0*15-0*35 o-15-0.20 0.35 0*40-0~70 040-0.30 0.15-0.10 0.45 O-38-0*45 0~10.10-0.35 0.35 0.35-0.35 O*lO-0.40-l . ‘ c.0*35 0*10-0*35 @lo-o*35 0*10-0*35 O*lO-0.45-0.60 l.15-0.35 0.20-0*35 0.90 O-40-0.75-3.55 0~50-060 0.35 o-30-040 0*40-o-50 0*50-060 0.53-0.35 0.we IS 1762 (Partl):l!w4] .70 1*65-2.50-0.80 l-30-1.27-0.50-0.22 0.60-l a00 0.35 0*10.15-0.35 0.35 0~10-0~35 0*15-0.42 0~30-040 0*30-0.30 090-1~30 O-50.IS 13352 : 1992 Table 2 Chemical Composition of Steels ( Clause 6. - O-15-0.80 0.70 040-0.0*35 O*lO-0.25 0. it may be desirable that the range of carbon content should be more closely controlled than in the ranges specified above.35 o-15-0.40-0.35 0.22 0.70 0.60-1.15-0.1 ) Steel Desigtition [-.45 0~30-040 0.0*70 0.80 0.17-0.00~1.15-0.55 0.35 O+lO-0.12-0~18 o-14-0.30-1.15-0..63 0.50 1*50-2*00 060-1~00 1.30 O-15-0*25 O-20-0.0~20 O-20-0.20 090-l -20 2%3.25 0*15-O-35 0*15-0.34 0.10~0. .18 0.35 -- 1.90 040-0.25-1.70 0~40-0~70 0.32-0.40 O*lO-0.122 0*10-0*20- ‘\ .30-1.50 3904*30 1*20-160 1.30 0.60-0.50-9.0. 2 When required the steels shall be supplied in fully aluminium killed condition with prior agreement and the total Aluminium content shall be within 0. Constituents.75 V Cr 140-1.0.17-0.35 0.30-1.65-2.19 0.00 040-0.80 06@090 060-090 0*40-0.17 0.70 Ni Si (4) o-15-0.30 1~00-140 040-060 060-l *oo 0.50-0.80 - 0.20 060-0.20-0.70-l -10 0*60-0.35-0.15-0.22 0.15-0.70 1.35 O* lO-0.45-O-65 09tLl*lO - - Al - (9) 2 -.45-0.70 NOiTS 1 In special cases.35 0*15-040 0.
20 5. m A up to 250 Over :gGZ Percent ( f ) Percent ( f ) (3) 0.40 to up to 1.20 to up to 040 Over O-40 to up to o-15 Over O-15 to f o-035 s 0.07 O-04 8% X:2 o-02 O-03 0.1 The forging stock rolled/forged from the continuously cast product shall have high standard of surface quality. 10 CLEANLINESS OF THE STEEL 10.03 O-04 o-02 0. Conditioning of any incidental presence of defects on the surface is permissible in a manner which will not impair the forgeability of the stock or will disturb the dimensions required.Is 13352 : 1992 Table 3 Permissible Variahn Incheck Adysis ( Clause 6.00 Over l-00 to Over 2.02 o-03 0.06 2.00 0.03 0.1 the variation in the product analysis of sulphu is f 0X)05.1 ) Constituent Maximum Sped&d Range c Percent (1) Carbon Silicon Manganese Nickel Chromium Molybdenum Vanadium Sulphur Phosphorus (2) up to o-45 Over 0.04 0.00 2.03 o-05 0.1 Inclusion rating of the steel shal1 be determined in accordance with IS 4163 : 1982. 9. out the b) The the The any sample is hot upset to 50 percent of original height.07 0.05 0.40 Over 0.1.03 o-05 o-11 0. the permissible depth of seam shall be 1 percent of the forging stock diameter/thickness or O-5 mm whichever is less. 9.20 to up to 1.50 I.3 The forging stock surface should be able to withstand HOT UPSET TEST as described below when mutually agreed for: Upset test from every heat is to be carried in the following manner: a) A sample of height diameter/thickness equal to 2 times is to be taken. The worst field of each inclusion from each specimen shall be recorded as a rating for the specimen. iezyiation shall not be applicable both over and under the specified limits on several determination in a 9 SURFACE DEFECTS 9.20 to Up to 0.010 O-010 NOTES 1 For sulphur controlled steels as per limit II of clause 6.20 Over 1.45 to up to 0. outside surface should not indicate crack or lap after upsetting.80 to Over 2.20 5.00 (4) 0”:: 0. The inclusion rating for the specimens shall not exceed the following limits: a) For air melted quality Rating L z--r+ Th Tk 32 C B r--l Th Tk 32 D c--7 Th Tk 32 b) For vacuum.035 Permissible Variation for Nominal Sk. ESR or secondary refined quality \ +Th Tk 32 Subject to mutual agreement .20 O-30 o-03 0.03 0*005 0*005 2.2 Seams For general forging purposes.05 O-90 2.80 Over 0.
shall be in 12. One sample product sha11 be taken from each heat treatment batch for the determination of hardness. For as rolled bars the straightness tolerance shall be as agreed to between the purchaser and supplier.IS 13352: 1992 10. 13 SAMPLING The laddle analysis shall be supplied by the manufacturer. 13.1. shal1 be agreed to at the time of enquiry and order.1 Sampling for Chemical Analysis 13.1 For product analysis the selection of samples shall be carried out.3 Sampling for Mechanical Properties If the material is supplied on the basis of core prOpertieS of test bars after case hardening. 11.3 Radial twist more than 3” ( or else 2 mm per meter ) measured over 1 meter of billets.2 When required and ordered. the Jominy values . Table 4 13. The level of acceptance shall be as agreed to between the purchaser and supplier at the time of enquiry and order.2 Sampling for Hardness in the Norm&@ or Annealed Condition AND TOLERANCES 12. The selection of samples shall be as agreed to mutually between the supplier and the purchaser. Provisional Limiting Values of Rockwell C Hardness when Testing for Hardenability by End Quench Test Method ( Clause 11.1 ) steel Grade (1) %:Z Of (2) Hardness in -- 1. 11 HARDENABILITY 12 DIMENSIONS 12. bloom shall not be permitted. cleanliness of the steel can also be assessed by step down test and magnetic particle test method as per IS 10138 (Part 2) : 1983 and IS 10138 (Part 3) : 1983. The tolerance on straightness shall be 3 mm for every meter length of machined straightened bars. the requirement shall be mutually agreed to between the purchaser and the manufacturer or else as given in Table 4. given in this table. one sample product per heat shall be taken from each size grouping for heat treatment and testing.1 For steels ordered on the basis of end quench hardenability. If the product analysis is required by the purchaser at least one sample product shall be taken from each cast.5 3 5 HRC at a Distance from the Quenched End Face in ( mm ) of -~~---A-_--~ -- 7 9 11 13 15 20 25 30 35 40 45 s‘o (15) (16) (17) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) 27C15 Maximum Minimum 55 46 54 43 51 37 48 31 45 27 42 23 39 20 37 - 33 - 31 - 29 - 28 _ 27 _ 27 -- 26 16Mn5Cr4 Maximum Minimum 47 39 46 35 44 31 41 28 37 24 35 22 34 20 33 - 31 - 30 _ 29 - 28 _ 27 _ _ _ _ _ 2OMn5Cr5 Maximum 49 49 48 46 44 42 41 40 37 35 34 33 31 _ _ Minimum 41 39 36 33 31 29 27 25 23 21 - - _ _ _ Maximum Minimum 47 39 47 38 46 36 45 35 43 32 42 30 41 28 39 26 37 24 35 22 3$ 34 20 33 - _ 20 - _ 40Cr4 Maximum Minimum 61 53 61 52 60 50 59 47 58 44 56 40 54 37 52 35 46 30 42 27 40 25 38 23 37 22 36 21 35 20 4OCr4Mo3 Maximum Minimum 61 53 61 53 61 52 60 51 60 50 59 48 59 45 58 43 56 38 53 35 51 34 48 47 46 45 33 32 32 32 Maximum 65 65 64 64 63 63 62 61 60 58 56 55 54 53 53 Minimum 57 56 56 55 53 52 50 48 44 41 40 39 38 37 37 should be 14Cr6Ni6 5OCr4V2 NOTE mutually For steels whose hardenability values are not agreed between the supplier and the purchaser.2 The method of testing hardenability of steel shall be in accordance with IS 3848 : 1981. 13. bi*lets etc.1 The tolerance on the size accordance with IS 3739 : 1987. 11.2 The length or bars.
13. the lot represented shall be accepted. unless otherwise agreed to between the purchaser and the manufacturer.13352 : 1992 13. OF SECTION THJITKSTPIECESINTHE PRODUCTSTO BE DELIVERED 8 . 2 meet the composition requirements given in Tables 2 and 3. two new samples shall be taken on different pieces from the same cast. 2.1 Retest for Product Analysis If the results of the product analysis + w 528 I LOCATION do not 12*5- IMPACi TEST PIECE RECTANGULAR TENSliE TEST PIECE FIG.3.:IB.4 General condition for selection and preparation of samples and test pieces shall be in accordance with IS 3711 : 1990. the material shall be taken as not complying with this standard.1 Test pieces for mechanical tests shall be taken in the longitudinal direction of the product as shown in Fig. Should either of the tests fail. 14 RETESTS ‘14. Should the two analysis satisfy the requirements.
9 . if required. A-l BASIS FOR ORDER A-l. The consignment shall be considered to conform to the requirements if both the additional tests are satisfactory. Bars of smaller sections shall be tied in’ suitable bundles which will carry metal tags giving the information. if he so desires.2 The acceptable level for each or any of these additional tests shall be mutually agreed to at the time of enquiry and order. the lot represented shall be accepted. may also be marked with the I. Should either of the samples fail. Should either of the test pieces fail. the material shall be taken as not complying with this standard. 16. fails to meet the requirements under 7..3 The material Standard Mark. e> Method of manufacture.3. s.2 The bars.1 While placing an order for the steels covered by this standard.~ . the manufacturer shall have the right.1 If agreed to between the purchaser and the manufacturer at the time of enquiry and order. to reheat-treat the product in any suitable manner before two fresh samples are taken for testing. length. any or a combination of the following 16. urer. c) d) Test required.:.. turned and tested. two further samples shall be selected from the same size grouping for making fresh test bars. 15 ADDITIONAL TESTS 15. Cleanliness test by ‘Blue Fracture Test’ as per IS 10138 ( Part 1 ) : 1982.3 Retest for Mechanical Tests on Test Pieces 16 MARKING If the samples selected under 13. : 4 Ultrasonic b) c> d) 16. and g> Test report. Retest for Hardness Test in the Normalised/ Annealed Condition tests may also be carried the steels meet the quality purchaser: out to ensure that requirements of the If the sample selected under X3.2 fails to meet the requirements under 7.14. billets. finish etc. i test in accordance with IS 3664 : 1981 Blank hardening test for core strength guarantee. Should the two tests satisfy the requirements of this standard. Microstructure for machinability including banding.-‘\ ANNEX A ( Foreword INFORMATION ) TO BE SUPPLIED BY THE PURCHASER b) Description regarding size. :‘.1 All bars of 40 mm dia or equivalent section and above shall be stamped or suitabIy marked at the end with material designation. .. heat number and indicating the source of manufact--.. Condition of delivery. _. the purchaser should specify clearly the following: a) Grade designation. two further samples shall be selected from the same heat treatment batch. The consignment shall be considered to conform to the requirements if both the additional tests are satisfactory. The fresh test bars shall be case hardened. 15. 14. the material shall be taken as not complying with this standard. f) Any special requirements. etc shall be suitably colour coded at the ends to mark the grade of the material. Should either of the samples fail. The colour scheme followed can be in accordance with IS 2049 : 1976 orEa+ pg~~_ purchaser’s requirement./.
1 ) LIST OF REFERRED IS No.IS 13352 : 1992 ANNEX B ( clause 2. Title Title Methods of chemical analysis of steel ( second revisioh ) 3848 : 1981 General requirements for the supply of metallurgical materials (first revision ) Method for end quench test for hardenability of steel (first revision ) 4163 : 1982 Method for determination of inclusion content in steel by method ( jirst microscopic revision ) 4432 : 1988 Case hardening revision ) Method for brine11 hardness materials test of metallic ( second revision ) steels (first 1598 : 1977 Method for izod impact of metals (first revision ) test 4748 : 1988 1608 : 1972 Method for tensile testing of steel products (first revision ) Methods for estimating average grain size of metals ( first revision ) 5517 : 1978 Steels for hardening and tempering (first revision ) 2049 : 1978 Colour code for the identification of wrought steels for general engineering purposes ( first revision ) 3664 : 1981 Code of practice for ultrasonic pulse echo testing by contact and immersion methods (first revision ) 3711 : 1990 3739 : 1987 methods Macroscopic 10138 for of non-metallic ( Part 1) : 1982 determination inclusion content in wrought steels Part 1 Blue fracture test methods Step machined 10138 ( Part 2 ) : 1983 10138 Magnetic ( Part 3 ) : 1983 method Wrought steel selection and preparation of samples and test pieces for mechanical tests (first revision ) Dimensional tolerances for carbon and alloy constructional steel products ( first revision ) 10 test particle methods inspection 11371 : 1985 Method for macroetch wrought steel products 12037 : 1987 Macrographic examination of steel by sulphur print ( Baumann method ) test for . 228 1387 : 1967 1500 : 1983 INDIAN STANDARDS IS No.
I . BIS for conformity to that standard as a further safeguard. testing and quality control which is devised and supervised by BIS and Standard marked products are also continuously checked by operated by the producer. The Standard 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. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 1986 and the Rules and Regulations made thereunder.I 1 Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act.
T. ( Publications ). M-ID 18 ( 3216 ) Amendments Amend Issued Since Publication Date No. of necessary details. I. GHAZIAHAD. marking and certification of goods and attending to connected matters in the country. 632 ?2 95. 600113 4 1 24 42. Road. 41 25 19. PATNA. I. BHUBANESIIWAK. E9 MIDC. 331 I3 75 Regional Offices Marg. India . g the standard. BE-3 is a statutory institution promote harmonious development of the activities of standardization. Scheme CALCUTTA 700054 Sector Shah Zafar Marg 331 01 31 c 331 13 75 37 84 99. BUREAU OF of Issue INDIAN Text Affected STANDARDS Headquarters: Manak Bhavan. Western : Manakalava. JAIPUK.4 I-ORE : AHMADABAD. Campus. IV Cross Road. possession of the latest amendments or edition. New Delhi 110002 Telegrams : Manaksanstha ( Common to all Ofhces : ) Telephone Central : Mnnak Bhavan. No part of these publications may be reproduced in any form without the prior permission in writtin. Northern : SC0 445-446. such as symbols and sizes. T. are issued from lime to time. 1. 41 23 15. This does not preclude the free use. HYDERABAD. Revision of Indian Standards Indian Standards are reviewed periodical!y and revised. type in the course of implcmcntin Enquir-ies relating to copyright be addressed to the Director or grade designation. if Users of Indian Standards should ascertain that they are in any. Maniktola 35-C. KANPUR. 1 37 85 26. 1986 to quality Copyright n1S has the copyright of all its publications.Bureau of Indian Standard established under the Bureau of Indian Standards Act. Comments on this Indian Standard may be sent to BIS giving the following reference: Dot : No. I 53 23 84 53 16 40. THIRUVANANTHAPURAM. 31 85 62 VII M.UWAHATI. BlS. Cc.1 hl B.. 632 78 92 63 27 80. LUCKNOW. BHOPAL. . MADRAS Andheri ( East ) Printed at Printwell Printers. V. 41 29 16. BOMBAY 400093 Branches BANGALORE. 9 Bahadur NEW DELHI 110002 Eastern : l/i4 C. 0 of BIS. C. P. when necessary and amendments. 37 85 61. Aligarh. Southern : C. FAKIDABAD. CHANDIGARH 160036 53 38 43. 9 Bahadur Shah Zafar Telephones : 331 01 31. Marol.
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