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“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

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“The Right to Information, The Right to Live”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 6727 (1972): Fireclay checker bricks for open hearthfurnace [MTD 15: Refractories]

Is a 45727 - 1972

Indian Standard -SPECIFICATION FOR

FIRECLAY CHECKER-BRICKS FOR OPEN-HEARTH FURNACE

Refractories Sectional Committee, SMDC 18

Chair&n SHRI J. C. BANRRJEE

107 C. I. T. Road, Belcghata. Calcutta 10

Members Representing

CDR S. P. AGARWAL.A Naval Headquarters Swru B. S. KAPUR ( Alternate )

SHRI T. R. ANA~~I-HARAMAN Hindustan Steel Ltd ( Central Engineering & Design

SHRI B. RAMACHAN~JRAN ( Aflnnute ) Bureau ) , Ranchi

SHRI R. V. BAINDOOR The Associated Cement Companies Ltd, Bombay SHRI J. 1’. JOSHI ( Alfernafc )

SHRX I. B. BANERJEE Hindustan Steel Ltd (Alloy Steels Plant ), Durgapur SHRI B. N. BHASKAR The Ishwar Industries Ltd, New Delhi

SHRX R. N. BHASKAR ( Akmate ) SHRI H. V. BHASKAR RAO Bird & Co Private Ltd, Calcutta

SHRX A. SEN ( Alternate) SHRID.S.CWAB~AL Directorate General of Technical Development,

New Delhi SHRID.K.CHAKRAVORTY SHRI D. K. CHA~TERJEE

SHRI R. C. NANDY ( Alternate ) CHEMIST & METALLURGIST ( S. F. ),

CHITTARANJAN LOCOMOTIVE WORKS,CHITTARANJAN

DEPUTY DIREWR(ZT-3 ), RESEARCH, AND STAVDARDS ORGANIZATION, CHITTARANJAN ( Alternate)

SHRI B.K.P. CHIBBAR

Directorate General of Ordnance Factories, Calcutta M. N. Dastur 8; Co ( Private) Ltd, Calcutta

Ministry of Railways

Bokaro Steel Ltd, Bokaro Indian Engineering Association, Calcutta SHRI A.E. CRAWLEY

SHRIN. K. BHAMBHANE (Alternate) SHRI M. H. DALMIA Orissa Cement Ltd, Rajgangpur

DR J. D. PANDA ( Alfernate) SHRI G. C. D,Q National Test House, Calcutta DR S. S. DAS Orissa Industries Ltd, Rourl;ela

SHRI K.&PANDA (Alferna!e) ( Continued on page 2 )

@ Cojyright 1973

INDIAN STANDARDS INSTITUTION

This publication is protected under the Zndiun 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 : 6727 - 1972

(Confinucdffom~gd 1 )

Members Refwcsenting

SHRI M.H. GAJENDRAGADKAR Hiidustan Steel Ltd ( Bhilai Steel Piant ), Bbilai SHRI S. K. MUKHERJEE ( Altcmafc j

SHIU ACHYUT A. GANPULE .%a1 V. H. APACHE ( Alternate )

DR S. S. GHOSE DR A. K. Bos~3 ( d?nnoft)

SWR1R.K. GoVINDACHAR

i’he Parshuram Pottery Works Co Ltd. Morvi

Belpabar Refractories Ltd, Bc!pahar

India Fire Bricks & Insulation Co Ltd, Marar,

SHRt S. K. BISWAS ( Alfunafc )

SHRI EC. K. GUPTA ROY

Distt Hazari Bagh ( Bihar ) ,

Sndian Iron & Steel Co Ltd, Burnpur SHRI D. N. BANERJEE ( Alfematt )

SHRI X. P. JHKXJHUNWALA All India Glass Manufacturers’ Federation, New Delhi

SHRI R. C. SINGHAL ( Altcmafc )

SH~I K. L. MATHUR Bhupal Mining Works, Bhilwara SHRI K. N. MATHUR ( A/female )

DR H. K. MITRA In personal capacity (_P 16/lB, Keyafulu Lane, Cu!cutla 29)

SHRI K. N. MUKHERJEE The Behar Firebricks & Potteries Ltd. Dhanbad SHRI S. X. BAXERJEE ( Alfwnufc )

SHRI H. P. S. MURT~Y liational Metallurgical Laboratory (CSIR) , Jamshcdpur

SHRI J. R. K. MURTHY Harry Refractory & Ceramic Works Private Ltd, Calcutta

SHRI A. B~su ( Alfcmute )

DR D. N. NANDI Central Glass & Ceramic Research Institute

SHRI N. B. CHATTERJEE ( Altnnatc ) ( CSIR ), Calcutta

SHRI P. S. XARAYANA The Engineering & Mineral Industrial Research Laboratory, Bangalore

DR B. RAO The Tata Iron & Steel Co Ltd, Jamshedpur SHRI B. N. GHOSH ( Altemak)

SHRI D. S. J. RAO Hindustan Steel Ltd (Durgapur Steel Plant ), Durgapur

SHRI I. C. MODI ( Ah-mote ) SHRI D. K. RAY Inspection Wing, Directorate General of Supplies 8r

Disposals, New Delhi SHRI B. B. BMERJEE ( .4lkrnafr )

SHRID.R.SUBRAMANIAN Bum gL Co Ltd, Calcutta SHRI I;. N. MARWAHA ( Alkrnot~ )

SHR~ P. S. SUNDARAM Hindustan Steel Ltd (Rourkela Steel Plant ), Rourkela

SHRI 3cl. PRASAD ( Ahmate ) SHRI R. I;. SRZVASTAVA,

Deputy Director ( Strut gi Met j Director General, IS1 ( Ex-@i&o Member )

( Sem la?7 )

( Confined OR page 6 )

2 .

IS : 6727 - 1972

Indian Standard

SPECIFICATION FOR FIRECLAY CHECKER-BRICKS FOR

OPEN-HEARTH FURNACE

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 25 October 1972, after the draft finalized by the Refractories Sectional Committee had been approved by the Structural and Metals Division Council.

0.2 This standard keeps in view the manufacturing and trade practices followed in the country in this field.

0.3 This standard contains clause 4.2 which calls for agreement between the purchaser and the manufacturer.

0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, express- ing the result of a test or analysis, shall be rounded off in accordance 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

1.1 This standard covers requirements for fireclay checker-bricks for open- hearth furnace.

2. TYPES

2.1 Fireclay checker-bricks shall be of three types, namely, Type 1, Type 2 and Type 3.

3: SUPPLY OF MATERIAL

3.1 General requirements relating to the supply of fireclay checker-bricks shall be as laid down in IS : 1387-1967t.

*Rules for rounding off numerical values ( m&d). tGenera1 requirement3 for the supply of metallurgical materials (first revision ).

3

IS : 6727 - 1972

3.2 The checker-bricks shall be compact, of homogeneous texture and free from cracks, internal fissures, cavities, voids and other flaws, They shall be burnt evenly throughout, and shall have sufficient mechanical strength and no soft corners.

4. TOLERANCE ON SIZE

4.1 Rectangular Checker-Bricks - Variations from specified length and thickness shall be allowed to the extent of 2 y.5 percent or 2 3” mm whichever is greater.

4.2 Special Shapes - Size iolerance for interlocking and/or specifi- ed checkers shall be as agreed to between the purchaser and the manufacturer.

5. CHEMICAL COMPOSITION

5.1 The alumina content of fireciay checker-bricks, when determined in accordance with IS : 1335-1959*, shall be as follows:

Percent, Min

Type 1 30

Type 2 36

Type 3 39

6. PHYSICAL REQUIREMENTS

6.1 The three types of fireclay checker-bricks shall conform to the require- ments given in Table 1.

7. MARKING

7.1 The checker-bricks shall be clearly marked with the manufacturer’s name or trade-mark, and type.

7.1.1 The checker-bricks may also be marked with the IS1 Certification Mark.

XOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act and the Rules and Regulations 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-drfined system of inspection, testing and quality control which is devised and supervised by ISI and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the ISI Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution.

*Methods for the direct determination of alumina in refractory materials ( tentu& )_

4

.

IS : 6727 - 1972

TABLE 1 PHYSICAL REQUIREMENTS FOR FIRECLAY CHECKER-BRICKS

( czause 6.1 )

I%.

(1) ij

ii)

iii)

iv)

v)

CHARAIXERBTIC REQUIREMENT

w-3 Type 1 . Type 2 Type 3

(2) (3) (4) (5) Pgrometric cone equivalent, 30 313 33

Standard Pvrometric Cone : AST?rI j’Kumber, 3lin

Refractoriness under load 1 300 1400 1450 ( ra). “C, L%fzn

Apparent porosity, percent, 25 22 19 11faax

Cold crushing strengrh, 200 250 300 kgflcm”, Min

“eayzrncnt linear change _-& 1.5 5 1.0 -& I.0 reheating for

2 hours at 14OO”C, per- cent, b&w

*Methods of sampling and physical tests for refractory materials.

METHODOPTEST (REP TOCIAUSE No. OF IS : 1528-

1962* )

(6) 3

4

9

6

8

8. SAMPLING

8.1 Representative samples shall be drawn according to. the scheme of sampling given in IS : 152%lY62* for carrying out tests specified in this standard.

*Methods of sampling and physical tests for refractory materials.

5

13:6727-1972

Refractories Investigations Subcommittee, SMDC 18 : 3

CO?WtttU

SHRI J. C. BA~‘ERJEE 107 C. I. T. Road, Beleghata, Calcutta 10

Members Rtpwsmting

SHRI 1. B. -BANERJEE Hindustan Steel Ltd ( Alloy Steels Plant ), Durgapur SWRI B. N. BHASKAR The Ishwar Industries Ltd, New Delhi

5511~1 R. N. BHASKAR ( AIfernale ) SHRI 31. CHANDRASEKHAR Hindustan Steel Ltd ( Bhilai Steel Plant ), Bhilai

SlIRl S. I;. hlUKlrERJEE ( Al~efIUZ~G ) DR S. S. DAS Orissa Industries Ltd, Rourkela

SHRI IL. K. PANDA ( Alkmate ) DR S. S. GHOSE Belpahar Refractories Ltd. Belpahar SHRI D. GOPAUKRISHNAN Indian Refractory Makers Association, Calcutta

DR J.D. PANDA (Alfcmafe) SHRI K. K. GUPTA ROY -Indian Iron & Steel Co Ltd, Bumpur

SHRI D. N. BANERJEE ( Alfernotc ) DR G. N. MOHAWN Hindustan Steel Ltd (Durgapur Steel Plant ),

Durgapur SHRI 0. P. SANDHIR ( Alternote )

SHRI S. L. MO~TRA India Refractories, Calcutta SHRI S. S. MAUN ( A[lrmatc j

SHRI H. P. S. hfURTHY National Metallurgical Laboratory ( CSIR ), Jamshedpur

SHRI J. R. K. MVRTHY Harry Refractory & Ceramic Works Private Ltd, Calcutta

SHRI A. B.QU ( Altemok ) DR D. N. NANDI Central Glass & Ceramic Research Institute

SHRI N. B. CHA~ERJEE ( Ahmak ) ( CSIR ), Calcutta

DR J. D. PA~~)A Orissa Cement Ltd, Rajgangpur DRB.RAO

SHRI B. N. GHOSH ( Alternate ) The Tata Iron 8r Steel Co Ltd, Jamshedpur

SHRID.R.S"RRAMANIAN Bum & Co Ltd, Calcutta Snm K. N. MARWAHA ( A/ternote )

SHRI P. S. S~~ARAM Hindustan Steel Ltd (Rourkelu Steel Plant ). Rourkela

6