ASTM A367-2011(2017) Standard Test Methods of Chill Testing of Cast Iron《铸铁冷硬试验的标准试验方法》.pdf

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1、Designation: A367 11 (Reapproved 2017)Standard Test Methods ofChill Testing of Cast Iron1This standard is issued under the fixed designation A367; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number

2、in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods of chill testing apply to gray ironsthat are to be free of chill in the casting and to chilled irons thatare to have a spec

3、ific depth of chill in the casting. Two testmethods of determining the chilling tendencies of cast iron arecovered as follows. For many applications, either test methodwill be satisfactory if test pieces of the proper dimensions areselected.1.1.1 Test Method A, Wedge TestThis test is generallybetter

4、 adapted to the higher-strength gray irons. The acceler-ated cooling rate to induce the formation of a chill is broughtabout through the design of the test specimen. This test methodis simpler than Test Method B since maintenance of chillblocks or plates is not necessary.1.1.2 Test Method B, Chill T

5、estThis test is better adaptedto the softer grades of gray iron and should be used if thecasting is to have a specified depth of chill. The chill in thistype of test is induced by casting one edge of the test specimenagainst a metal or graphite chilled plate or block.1.2 The values stated in inch-po

6、und units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 The metric equivalency charts in Figs. 1 and 2 areprovided for information only.1.3 This standard does not purp

7、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.1.4 This international standar

8、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.TEST ME

9、THOD A WEDGE TEST2. Application2.1 Selection of a test specimen of appropriate dimensionswill allow measurement of chilling tendencies of all gray ironcompositions, with the exception of those having siliconcontents much over 2.50 % together with carbon contents over3.50 %.3. Test Specimens3.1 The p

10、atterns for the test specimens shall be made ofmetal to the dimensions shown in Fig. 1. With the exception ofthe length of the test specimen, dimensions shall not vary morethan 6132 in. (0.8 mm). The tolerance on the length of thespecimen shall be 618 in. (3.2 mm). The radius on the apex ofthe wedge

11、 should be formed by filing a132-in. flat on the sharpedge of the metal pattern and then carefully rounding the edgesformed by the132-in. flat and the sides of the wedge. If draft onthe pattern is desired, it may be obtained by varying dimensionH (Fig. 1) from one end of the specimen to the other. T

12、hepattern should be mounted in a core box so that the final corecan be poured with the wedge in such a position that its lengthis vertical. There shall be 1 in. (25.4 mm) minimum sand at thebottom of the core.4. Procedure4.1 CoresMake the test in a core. The cores may be eithersingle cores or gang c

13、ores. If a gang core is used, the minimumamount of sand between adjacent test specimens shall be notless than 212 B (Fig. 1). The sand cores shall be well curedand free of moisture. The base sand shall be of such finenessthat a smooth casting will be obtained. A sand with an AFSfineness2of about 70

14、will be found satisfactory, although asand with a fineness of 100 or finer may be used for the smallertest specimens.4.2 Pouring PracticePour all samples at as consistent apouring temperature as possible, since the amount of chill isclearly affected by the pouring temperature. Take precautionsto obt

15、ain a representative sample of iron for the test specimen.Best results are obtained with a sample ladle lined with arefractory mixture that is free of graphite and chilled iron. The1These test methods are under the jurisdiction ofASTM Committee A04 on IronCastings and are the direct responsibility o

16、f Subcommittee A04.21 on Testing.Current edition approved Oct. 1, 2017. Published October 2017. Originallyapproved in 1953. Last previous edition approved in 2011 as A367 11. DOI:10.1520/A0367-11R17.2Mold 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:/ 11 (2017)4