1、Designation: A 610 79 (Reapproved 2004)Standard Test Methods forSampling and Testing Ferroalloys for Determination of Size1This standard is issued under the fixed designation A 610; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover procedures for the samplingand testing of the various ferroalloys for sizing, eit
3、her before orafter shipment from the plants of the manufacturers.1.2 They are designed to give results representative of eachlot that will be comparable with the manufacturers certifiedanalysis for the same lot.1.3 The purchaser may use any sampling procedure hedesires, but the results obtained on s
4、uch samples shall not be abasis for complaint or rejection, unless the procedure followedis of an accuracy equivalent to that prescribed in these testmethods.1.4 The values stated in inch-pound units are to be regardedas the standard. The SI equivalents of inch-pound units may beapproximate.1.5 This
5、 standard does not purport 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents
6、2.1 ASTM Standards:2E 11 Specification for Wire Cloth and Sieves for TestingPurposesE 32 Practices for Sampling Ferroalloys and Steel Additivesfor Determination of Chemical Composition3. Unit Quantities for Sampling and Testing3.1 Each shipment, except as otherwise agreed upon by thepurchaser and th
7、e manufacturer, shall constitute a unit forsampling and testing. It is recommended that shipments of anyalloy exceeding 100 tons (91 000 kg) be divided into smallerlots for sampling according to some plan best adapted to thematerial and conditions, such as each cast, each carload, eachladleful or ea
8、ch binful. The division of samples should be inaccordance with Practices E 32.4. Sampling for Size Analysis4.1 LumpsConformance of lump material to sizing stan-dards normally shall be judged by visual examination. Theinspection judgment shall be made on an increment selected atrandom. Unless otherwi
9、se required, the increment shall be thecontents of a unit container of 2000 lb (910 kg) minimumquantity. When more precise data are required for checking onthe visual examination, a sizing test shall be made on materialfrom a unit container (usually 2000 to 3000 lb (910 to 1360 kg)of alloy) selected
10、 at random.4.2 Crushed or PlatesSampling for conformance ofcrushed or plates material to size requirements shall be inaccordance with Practices E 32 or by alternative methodswhich are demonstrated to yield equivalent results. A represen-tative portion of the lot sample (before any reduction in parti
11、clesize) shall be obtained for screen testing. If necessary, thepercentage of sample taken shall be increased to providesufficient sample in the half reserved for screen testing.4.2.1 Table 1 lists the amount of material that is to be usedfor size analysis.4.2.2 If the top size of the material is 2
12、in. (50.8 mm) orsmaller, the portion for screen test shall be taken from the lotsample by riffling; in larger sizes, by mixing and quartering.Prior to riffling, the starting amount each time must be mixedby coning at least twice.5. Testing for Size Analysis5.1 Samples used for screen testing must be
13、 dry. If there isa question as to whether the material is suitably dry, a criterionof 0.25 % loss in weight at 230F (110C) applies.5.2 With respect to size characteristics, ferroalloys areusually classified as either “lump” or “crushed” sizes. Althoughthe line of demarcation may vary somewhat, the c
14、rushedcategory refers usually to those sizes that have an upper limitof 4 in. (102 mm) or less. The lump sizes involve all of theother categories that are coarser than 4 in. in top size.5.3 LumpsUsing either weight or lineal measurements ascriterion, hand select all pieces from the container that ex
15、ceedthe upper limit of this size category. Determine the total weightpercent of the oversize material for conformance against themaximum permitted by these test methods. Determine the1These test methods are under the jurisdiction of ASTM Committee A01 onSteel, Stainless Steel, and Related Alloys and
16、 are the direct responsibility ofSubcommittee A01.18 on Castings.Current edition approved Oct. 1, 2004. Published October 2004. Originallyapproved in 1970. Last previous edition approved in 2000 as A 610 79 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
17、ustomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.amount of undersize by accumulat
18、ing all pieces from theoriginal container that pass through a grid with an opening thesame as the dimension given as the lower limit for the sizeunder test. Then compare the weight percent of this undersizewith the test method requirements.5.4 Crushed or Plates:5.4.1 EquipmentScreens used in size an
19、alysis shall be inconformance with Specification E 11.5.4.2 Procedure:5.4.2.1 It is customary practice to use a nest of screens thatdivides the sample into several size fractions. For coarse sizes,the next is usually rocked by hand about 25 times, removingthe top screen, and weighing the amount reta
20、ined each time.Mechanically driven screen vibrators may be used provided thetime is kept to an absolute minimum in the case of the morefriable alloys to prevent excessive formation of fines fromabrasion. For sizes less than14 in. (6.35 mm), the test is usuallymade on a machine that causes particle m
21、ovement relative tothe screens by circular motion and intermittent tapping. Asieving time of 10 min or more is required. In determiningsieving time or end point, the criterion is that an additionalperiod of testing does not change the results on any sieve usedin the analysis by more than 2 % of the
22、previous value. Eachsieve is to be checked for complete sieving.5.4.2.2 Intermediate fractions, that is, those between theoversize and undersize amounts, are not covered by specifica-tions, but the use of intermediate screens helps preventoverloading the bottom screen. It may be necessary to add the
23、sample in several increments or empty the various screens oneor more times during the operation, or both. Excessive timesfor completion of screening are usually the result of overload-ing one or more screens.6. Keywords6.1 crushed; ferroalloys; lump; plates; sampling; sieving;size; sizingASTM Intern
24、ational 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 entirely t
25、heir 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 shoul
26、d 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 Stand
27、ards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-8
28、32-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Amount of Material Required for TestingUpper Limit of Size Category, in.(mm)Amount for TestingLarger than 2 in. (50.8 mm) 200 lb (91 kg) (min)12 to 2 in. (12.7 to 50.8 mm) 50 to 100 lb
29、 (23 to 45 kg)A14 to12 in. (6.35 to 12.7 mm) 25 to 50 lb (12 to 23 kg)A4 mesh 700 to 1000 gA20 mesh 300 to 500 gA48 mesh 100 to 300 gA100 mesh 50 to 150 gA200 mesh 50 to 100 gAAThe larger amounts are to be used for testing alloys of high specific gravity(50 % ferrosilicon and higher density); the smaller amounts are to be used for lightalloys and metals (for example, calcium silicon and silicon metal).A 610 79 (2004)2
