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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 1749 (2005): Burnt magnesite refractories [MTD 15: Refractories] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 1749:2005 wm%m’m - Wf%T1-F w-m-ii – fafm ( a?i’wjy)i%wl) Indian Standard BURNT MAGNESITE REFRACTORIES — SPECIFICATION ( Third Revision) ICS 81.080 0 BIS2005 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 ,4 2005 U~llSt Price-Group 1 .., Refractories Sectional Committee, MTD 15 FOREWORD This Indian Standard (Third Revision) wasadopted bythe Bureau ofIndian Standards afierthe dratl finalized”by the Refractories Sectional Committee had been approved by the Metallurgical Engineering Division Council. This standard was first published in 1961and subsequently revised in 1972and 1984.Inthis revision, following changes have been made: a) Reference clause has been added; and b) Physical requirements have been modified. For the purpose of decided 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 with IS2: 1960 ‘Rules for rounding off numerical values (revised’. The number of significant places retained inthe rounded off value should be the same asthat of the specified value inthis standard. .. IS 1749:2005 Indian Standard BURNT MAGNTESITE REFRACTORIES — SPECIFICATION ( Third Revision) 1 SCOPE and shall have sufficient mechanical strength and no broken corners. T’hisstandard covers the requirements for three types of burnt magnesite refractories. 4 TYPES 2 REFERENCES Burnt magnesite bricks shall be of three types based on their chemical composition (see-5.1), namely: The following standards contain provisions, which through reference inthis text, constitute provisions of Types 1 and 2 : For general application this standard. At the time of publication, the editions Type 3 : Forspecial purpose applications indicated were valid. All standards are subject to in steel plants revision and parties to agreement based on this standard are encouraged to investigate the possibility 5 CHEMICAL COMPOSITION of applying the most recent editions of the standards indicated below: The refractories when tested in accordance with IS 1760 (Parts 2 and 3) shaIl have the following IS No. Title composition: 1387:1993 General requirements for the Type 1 Type 2 Type 3 supply ofmetalhmgical materials (second revision) Silica (SiOJ, percent, 6.5 5.5 4.0 Max 1528 Methods of sampling and physical test for refractory Calcium oxide (CaO), 2.5 2.5 2.0 materials percent, Max (Part 2): 974 Determination of refractoriness Magnesia (MgO), 85.0 85.0 91.0 under load (fzrst revision) percent, Min (Part 4): 974 Determination of cold crushing 6 PHYSICAL TEST REQU-IREMENTS strength (fu-st revision) (Part 7) : 974 Method of sam pling and criteria The burnt magnesite refractories when tested in for conformity @ rst revision) accordance with the test methods specified shall conform to the requirements given in Table 1. (Part 8) :1974 Determination of apparent porosity (first revision) 7TOLERANCE ON SIZE 1760 Methods ofchemical analysis of Variations from specif~d dimensions, covering both limestone, dolomite and allied warpage and shrinkage shall be allowed to the extent materials : of *1.5 percent or +=1mm, whichever is greater for Types 1 and 2 refractories and +1.0 percent or (Part 2) :1991 Determination of silica @rst +1mm,whichever isgreater for Type 3 refractories. revision) (Part 3): 1992 Determination of iron oxide, 8 SAMPLING alumina, calcium oxide and Representative samples shall be drawn according to “ magnesia @rst revision) the scheme of sampling given in IS 1528(Part 7). 3 GENERAL REQUIREMENTS 9 MARKING 3.1 General req~irements relating to the supply of 9.1 Each refractory brick or shape shall be clearly magnesite refractories shal] be as laid down m marked with the manufacturer’s name or trade-mark. IS 1387. 9.2 131SCertification Marking 3.2 These refractories shall be compact, of homogeneous texture and free from cracks, voids and The material may also be marked w-iththe Standard other flaws. They shall be burnt evenly throughout Mark. I .. IS 1749:2005 9.2.1 The use of the Standard Mark is governed by the use of Standard Mark may be granted to the provisions of Bureau oflndian Standards Act, manufacturers or producers may be obtained from 1986 and Rules and Regulations made thereunder. the Bureau of Indian Standards. The details of condition under which the license for Table 1 Physical Test Requirements for Magnesite Refractories (C/au.se 6) SINo. Characteristics Requirement MethodofTest, ReftoISNo. f \ Type 1 Type 2 Type 3 (1) (2) (3) (4) (5) (6) O Refractories under load(ta), “C,&fin 1550 1580 I 600 1528 (Part 2) ii) Cold crushing strength forpressedbricks, 35.0 40.0 60.0 1528 (Part 4) MPa, Min iii) Apparent porosity, percentj Mac 22 20 18 1528 (Part 8) NOTES 1 In thecaseofhand-moulded bricks andshapes,cold crushing strengthshall beasagreed tobetween thepurchaser andthe manufacturer. 2 1MPa = 10kgflcmz. .. Bureau of Indian Standards BIS is a statutory institution established under the Bureau oflndiarr Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright 131Shas the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission inwriting ofBIS.This doesnot preclude the freeuse,inthe course of implementing the standard, of necew.ary 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 asthe need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments isreaffirmed when such review indicates that no changes are needed; if the review indicates that changes aremeeded, it istaken up for revision. Users of Indian Standards should ascertain that they are inpossession ofthe latestamendments oredition byreferring tothe latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’. This lndian Standard has been developed from Dot: No. MTD 15 (4453). Amendments Issued Since Publication Amend No. Date of Issue Text Affected * BUREAU OF INDIAN STANDARDS Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones; 23230131,23233375,2323 9402 -website :www.bis.org.in Regional (lffices: Telephones Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg 23237617 NEW DELHI 110002 { 23233841 Eastern : 1/14 C.I.T. Scheme VII M, V.I.P. Road, Kankurgachi 23378499,23378561 KOLKATA 700054 { 23378626,23379120 Northern :-SCO335-336, Sector 34-A, CHANDIGARH 160022 2603843 { 2609285 Southern : C.I.T. Campus, IV Cross Road, CHENNAI 600113 22541216,22541442 {22542519,22542315 Western : Manakalaya, E9 MIDC, Marol, Andheri (East) 28329295,28327858 MUMBAI 400093 {28327891,28327892 Branches : AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHAT1. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. TH[RUVANANTHAPURAM. VISAKHAPATNAM. Printed at Simco Printing Press, Delhi