1、Designation:C45507(Reapproved 2013)Standard Classification ofChrome,Chrome-Magnesia,Magnesia-Chrome,andMagnesia Brick1This standard is issued under the fixed designation C455;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This classification categorizes machine-made refractorybrick defined as chrome,chrome-magnesia,magnesia-chrome,and magnes
3、ia brick(see 3.1).It does not cover products madefrom electrically fused magnesium oxide or to products madeby fusion casting.Its purpose is to describe classes distin-guished by obvious differences in magnesium oxide(MgO)content except for chrome brick.1.2 This standard does not purport to address
4、all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:C71 Terminology Relatin
5、g to Refractories2NOTE1Chemical analysis of refractory product is determined by acombination of x-ray fluorscence(XRF)and inductively coupled plasma(ICP)using standard reference materials(SRM),including various typesof minerals and refractory materials which are available from the NationalInstitute
6、of Standards and Technology and other appropriate sources.3.Terminology3.1 For definitions of terms used in this classification,seeTerminology C71.4.Significance and Use4.1 This classification categorizes the defined types ofrefractory brick,with the exception of chrome brick,intodistinct classes ba
7、sed on a nominal and minimal value formagnesium oxide content.Chrome brick are treated as aseparate class without reference to magnesium oxide content.Such classes have historically been generally useful in relatingthe defined types to specific industrial applications and indeveloping product or pur
8、chasing specifications.5.Basis of Classification5.1 Chrome-magnesia,magnesia-chrome,and magnesiabrick are classified by MgO content as shown in Table 1.Chrome brick is not classified by MgO content(see Table 1).6.Test Methods6.1 The determination of MgO on an ignited basis asrequired by this classif
9、ication shall be determined by a com-bination of x-ray fluorescence(XRF)and inductively coupledplasma(ICP)using standard reference materials(SRM),in-cluding various types of minerals and refractory materialswhich are available from the National Institute of Standardsand Technology and other appropri
10、ate sources.7.Retests7.1 Because of variables resulting from sampling and thelack of satisfactory reproducibility in tests conducted bydifferent laboratories,the material may be resampled andretested when requested by either the manufacturer or thepurchaser.This may apply in instances when the first
11、 testresults do not conform to the requirements prescribed in thisclassification.The final results to be used shall be the averageof at least two sets of results,each of which has been obtainedby following in detail the specified testing procedures.8.Keywords8.1 brick;chrome;classification;magnesium
12、 oxide;magne-sia;MgO;refractories1This classification is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.92 on The JosephE.Kopanda Subcommittee for Editorial,Terminology and Classification.Current edition approved Sept.1,2013.Published
13、 September 2013.Originallyapproved in 1960.Last previous edition approved in 2007 as C455 07.DOI:10.1520/C0455-07R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the
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16、d every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,at the address shown below.This
