ISO-13520-2002.pdf
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1、 Reference number ISO 13520:2002(E) ISO 2002 INTERNATIONAL STANDARD ISO 13520 First edition 2002-09-15 Determination of ferrite content in austenitic stainless steel castings Dtermination de la teneur en ferrite dans les pices moules en acier inoxydable austnitique ISO 13520:2002(E) PDF disclaimer T
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6、ester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 All rights reserved ISO 13520:2002(E) ISO 2002 All rights reserved iii Foreword ISO (the International Organization for
7、Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the r
8、ight to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Internation
9、al Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as
10、 an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pat
11、ent rights. ISO 13520 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel castings. Annex A forms a normative part of this International Standard. Annex B is for information only. -,-,- -,-,- INTERNATIONAL STANDARD ISO 13520:2002(E) ISO 2002 All rights reserved 1 Determin
12、ation of ferrite content in austenitic stainless steel castings 1 Scope Procedures are covered for estimating ferrite content in certain grades of austenitic iron-chromium-nickel alloy castings that have compositions balanced to create the formation of ferrite as a second phase in amounts controlled
13、 within specified limits. Methods are described for estimating ferrite content by chemical, magnetic and metallographic means. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For
14、dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For
15、undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 4990:1), Steel castings General technical delivery requirements ISO 9042:1988, Steels Manual point counting method for stati
16、stically estimating the volume fraction of a constituent with a point grid ASTM A799, Standard Practice for Steel Castings, Stainless, Instrument Calibration, for Estimating Ferrite Content BNIF 345, Evaluation de la teneur en ferrite dans les aciers inoxydables mouls austnitiques 3 Terms and defini
17、tions For the purposes of this International Standard, the following terms and definitions apply. 3.1 ferrite ferromagnetic, body-centered cubic microstructural constituent of variable chemical composition in iron-chromium- nickel alloys NOTE Ferrite includes both delta and alpha species. 3.2 ferrit
18、e content proportion of total volume of an iron-chromium-nickel alloy present as the ferrite phase 1) To be published. (Revision of ISO 4990:1986) -,-,- ISO 13520:2002(E) 2 ISO 2002 All rights reserved 3.3 ferrite percentage ferrite content expressed as a volume percent 4 Significance effects of fer
19、rite content The tensile and impact properties, the weldability, and the corrosion resistance of iron-chromium-nickel alloy castings may be influenced beneficially or detrimentally by the ratio of the amount of ferrite to the amount of austenite in the microstructure. The ferrite content may be limi
20、ted by purchase order requirements or by the design construction codes governing the equipment in which castings will be used. The quantity of ferrite in the structure is fundamentally a function of the chemical composition of the alloy and its thermal history. Because of segregation, the chemical c
21、omposition and, therefore, the ferrite content, may differ from point to point on a casting. Determination of the ferrite content by any of the procedures described in clause 5 is subject to varying degrees of imprecision which shall be recognized in setting realistic limits on the range of ferrite
22、content specified. Sources of error are described in 5.1 to 5.3. 5 Methods of determination of ferrite content 5.1 Chemical composition method Deviations from the actual quantity of each element present in an alloy because of chemical analysis variance, although possibly minor in each case, can resu
23、lt in substantial difference in the ratio of total ferrite-promoting to total austenite-promoting elements. Therefore the precision of the ferrite content estimated from chemical composition depends on the accuracy of the chemical analysis procedure. The estimation of ferrite percent by means of the
24、 chemical composition offers the most useful and most common method of ferrite control during melting of the metal. 5.2 Magnetic response method Phases other than ferrite and austenite may be formed at certain temperatures and persist at room temperature. Contamination from other ferromagnetic mater
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