ASTM A367-2011 Standard Test Methods of Chill Testing of Cast Iron《铸铁激冷试验的标准试验方法》.pdf

1、Designation: A367 11A367 11Standard 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 in parenthe

2、ses 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 irons that are to be free of chill in the casting and to chilled irons that areto have a specific depth

3、 of chill in the casting. Two test methods of determining the chilling tendencies of cast iron are coveredas follows. For many applications either test method will be satisfactory if test pieces of the proper dimensions are selected.1.1.1 Test Method A, Wedge TestThis test is generally better adapte

4、d to the higher strength gray irons. The accelerated coolingrate to induce the formation of a chill is brought about through the design of the test specimen. This test method is simpler thanTest Method B since maintenance of chill blocks or plates is not necessary.1.1.2 Test Method B, Chill TestThis

5、 test is better adapted to the softer grades of gray iron and should be used if the castingis to have a specified depth of chill. The chill in this type of test is induced by casting one edge of the test specimen against a metalor graphite chilled plate or block.1.2 The values stated in inch-pound u

6、nits are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.2.1 The metric equivalency charts in Figs. 1 and 2 are provided for information only.1.3 This standard does not purpor

7、t to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.TEST METHOD AWEDGE TEST2. Application2.1 Selection

8、 of a test specimen of appropriate dimensions will allow measurement of chilling tendencies of all gray ironcompositions, with the exception of those having silicon contents much over 2.50 % together with carbon contents over 3.50 %.3. Test Specimens3.1 The patterns for the test specimens shall be m

9、ade of metal to the dimensions shown in Fig. 1. With the exception of thelength of the test specimen, dimensions shall not vary more than 6132 in. (0.8 mm). The tolerance on the length of the specimenshall be 618 in. (3.2 mm). The radius on the apex of the wedge should be formed by filing a 132-in.

10、flat on the sharp edge of themetal pattern and then carefully rounding the edges formed by the 132-in. flat and the sides of the wedge. If draft on the patternis desired, it may be obtained by varying dimension H (Fig. 1) from one end of the specimen to the other. The pattern should bemounted in a c

11、ore box so that the final core can be poured with the wedge in such a position that its length is vertical. There shallbe 1-in. (25.4-mm) minimum sand at the bottom of the core.4. Procedure4.1 CoresMake the test in a core. The cores may be either single cores or gang cores. If a gang core is used, t

12、he minimumamount of sand between adjacent test specimens shall be not less than 212 B (Fig. 1). The sand cores shall be well cured andfree of moisture. The base sand shall be of such fineness that a smooth casting will be obtained. A sand with an AFS fineness2 ofabout 70 will be found satisfactory,

13、although a sand with a fineness of 100 or finer may be used for the smaller test specimens.4.2 Pouring PracticePour all samples at as consistent a pouring temperature as possible since the amount of chill is clearlyaffected by the pouring temperature. Take precautions to obtain a representative samp

14、le of iron for the test specimen. Best results1 These test methods are under the jurisdiction of ASTM Committee A04 on Iron Castings and are the direct responsibility of Subcommittee A04.21 on Testing.Current edition approved July 1, 2011. Published July 2011. Originally approved in 1953. Last previous edition approved in 2005 as A367 60 (2005). DOI:10.1520/A0367-11.2 Mold or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A367 114