1、Designation: E 448 82 (Reapproved 2002)e1Standard Practice forScleroscope Hardness Testing of Metallic Materials1This standard is issued under the fixed designation E 448; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 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.e1NOTESection 3.1.5 was editorially updated in June 2003.1. Scope1.1 This practice covers the determination of the Sclero-scope2
3、hardness of metallic materials (Part A), the verificationof Scleroscope hardness instruments (Part B), and the calibra-tion of standardized hardness test blocks (Part C).1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 T
4、his standard does not purport to address all of thesafety problems, 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 Docume
5、nts2.1 ASTM Standards:A 427 Specification for Wrought Alloy Steel Rolls for Coldand Hot Reduction3E 140 Hardness Conversion Tables for Metals (RelationshipAmong Brinell Hardness, Vickers Hardness, RockwellHardness, Rockwell Superficial Hardness, and KnoopHardness, and Scleroscope Hardness)43. Termin
6、ology3.1 Definitions:3.1.1 calibrationdetermination of the values of the sig-nificant parameters by comparison with values indicated by areference instrument or by a set of reference standards.3.1.2 forged roll Scleroscope hardness number (HFRSc orHFRSd)5a number related to the height of rebound of
7、adiamond-tipped hammer dropped on a forged steel roll. It ismeasured on a scale determined by dividing into 100 units theaverage rebound of a hammer from a forged steel roll ofaccepted maximum hardness.NOTE 1The flat striking surface of the hammer in the forged rollScleroscope is slightly larger tha
8、n the corresponding surface in theScleroscope described in 3.1.3 (see Fig. 1). Hence the forged rollScleroscope yields correspondingly higher hardness numbers.3.1.3 Scleroscope hardness number (HSc or HSd)a num-ber related to the height of rebound of a diamond-tippedhammer dropped on the material be
9、ing tested. It is measured ona scale determined by dividing into 100 units the averagerebound of the hammer from a quenched (to maximumhardness) and untempered high carbon water-hardening toolsteel test block of AISI W-5.3.1.4 Scleroscope hardness testa dynamic indentationhardness test using a calib
10、rated instrument that drops adiamond-tipped hammer (Note 2) from a fixed height onto the1This practice is under the jurisdiction of ASTM Committee E28 on MechanicalTesting and is the direct responsibility of E28.06 on Indentation Hardness Testing.Current edition approved July 30, 1982. Published Dec
11、ember 1982. Originallypublished as E 448 72. Last previous edition E 448 72 (1977).2Registered trademark of the Shore Instrument if not the machine should be verified asdescribed in 13.2.C. CALIBRATION OF STANDARDIZED HARDNESS TEST BLOCKS FOR SCLEROSCOPE HARDNESSINSTRUMENT15. Scope15.1 Part C covers
12、 the calibration of standardized hardnesstest blocks used for the verification of Scleroscope hardnessinstruments.16. Manufacture16.1 Each test block to be calibrated shall be of steel withdimensions not less than 1 by 1 by 3 in. (25 by 25 by 76 mm)and the opposite sides shall be parallel.16.2 Each
13、block shall be specially prepared and heat treatedto give a specific hardness and the necessary homogeneity andstability of structure.16.3 The surfaces of the four sides of the block shall have aground finish and shall be free from scratches which wouldinfluence the hardness reading.16.4 The mean su
14、rface roughness height rating of thesurface of each of the four sides shall not exceed 12 in. (300nm), centerline average.17. Standardizing Procedure17.1 Determine the hardness value of the test block by usinga Scleroscope instrument of accepted accuracy mounted in theclamping stand (see item (a) 4.
15、5).17.2 Make five randomly distributed hardness determina-tions on each of the four sides of the test block.17.3 Take the arithmetic mean of the twenty readings as themean hardness of the block.18. Uniformity of Hardness18.1 Unless 90 % of the twenty Scleroscope readings takenon the test block devia
16、te no more than 62 Scleroscope pointsfrom the mean hardness (see section 16.3), the block cannot beregarded as sufficiently uniform for standardization purposes.19. Marking19.1 Each block shall be marked on the end with thefollowing:19.1.1 One hardness number below and one hardness num-ber above the
17、 arithmetic mean of the hardness values found inthe standardizing test,19.1.2 The letters HS or HFRSc or HFRSd, as appropriate,to designate the type of instrument to be standardized (Note 3),andNOTE 3Test blocks for Scleroscope hardness numbers HSc and HSdare identical.19.1.3 The name or mark of the
18、 supplier.20. Keywords20.1 metallic; scleroscope hardnessE 448 82 (2002)e14ASTM International 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
19、 of any such patent rights, and the riskof infringement of such rights, are entirely 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
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21、received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, 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 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E 448 82 (2002)e15
