1、Designation: C455 07 (Reapproved 2018)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, t
2、he year of 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-c
3、hrome,and magnesia brick (see 3.1). It does not cover products madefrom electrically fused magnesium oxide or products made byfusion casting. Its purpose is to describe classes distinguishedby obvious differences in magnesium oxide (MgO) contentexcept for chrome brick.1.2 This standard does not purp
4、ort to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 This international standar
5、d was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Refe
6、renced Documents2.1 ASTM Standards:2C71 Terminology Relating to RefractoriesNOTE 1Chemical 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 refr
7、actory materials which are available from the NationalInstitute 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 ofrefracto
8、ry brick, with the exception of chrome brick, intodistinct classes based 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 typ
9、es to specific industrial applications and indeveloping product or purchasing 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 Methods
10、6.1 The determination of MgO on an ignited basis asrequired by this classification 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 av
11、ailable from the National Institute of Standardsand Technology and other appropriate 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
12、 either the manufacturer or thepurchaser. This may apply in instances when the first 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 detai
13、l the specified testing procedures.8. Keywords8.1 brick; chrome; classification; magnesia; magnesium ox-ide; 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 Subcommitt
14、ee for Editorial, Terminology, and Classification.Current edition approved Oct. 1, 2018. Published October 2018. Originallyapproved in 1960. Last previous edition approved in 2013 as C455 07 (2013).DOI: 10.1520/C0455-07R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orconta
15、ct ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standa
16、rd was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1ASTM In
17、ternational takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entire
18、ly their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand s
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21、10-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Classification of
22、Chrome,AChrome-Magnesia,Magnesia-Chrome, and Magnesia Brick According to MgOContentClassMgO Content, %BNominal MinimumChrome-Magnesia and Magnesia-Chrome BrickC30 30 2540 40 3550 50 4560 60 5570 70 6580 80 75Magnesia BrickC90 90 8695 95 9198 98 96AChrome bricka refractory brick, which may be burned or unburned, manufac-tured predominately or entirely of refractory-grade chrome ore.BIgnited basis.CThis classification applies to both chemically bonded and burned brick.C455 07 (2018)2
