इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 1586 (2000): Method for Rockwell Hardness Test for Metallic Material (Scales A-B-C-D-E-F-G-H-K 15N, 30N, 45N, 15T, 30T and 45T) [MTD 3: Mechanical Testing of Metals] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 1586:2000 (Superseding IS3754:1988, IS3804:1988, IS5072:1988, IS5073:1988 and IS5076: 1988) ) 45q=r, 15a, 3oa * 45tl ( rml jpaw7 ) Indian Standard METHOD FOR ROCKWELL HARDNESS TEST FOR METALLIC MATERIAL ( SCALES A-B-C-D-E-F-G-H-K 15N, 30N, 45N, 15T, 30T AND 45T ) ( Third Revision) Ics 77.040.10 0 BIS2000 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 October 2000 Price Group 9 Mechanical Testing of Metals Sectional Committee, MTD 3 FOREWORD This Indian Standard ( Third Revision ) was adopted by the Bureau of Indian Standard, after the draft finalized bythe Mechanical Testing of Metals Sectional Committee had been approved by the Metallurgic! Engineering Division Council. This Indian Standard was published in 1960and subsequently revised in 1968and 1988. Inthisrevision the requirement ofmethod for Rockwell superficial hardness test, calibration ofstandardized blocks and verification of Rockwell hardness testing machines have been included. In the preparation of this standard, assistance has been drawn from ASTM E 18-97a ‘Standard test methods for Rockwell hardness and Rockwell superficial hardness of metallic materials’ issued byAmerican Society for Testing and Materials, USA. This revised standard supersedes the following Indian Standards: 1sNo. Title 3754:1988 Method for calibration of standardized blocks to be used for Rockwell hardness testing machine (Scales A-B-C-D-E-F-G-H-K) (first revision) 3804:1988 Method for verification of Rockwell hardness testing machines (Scales A-B-C-D-E-F-G-H-K) (jirst revision) 5072:1988 Methods for Rockwell superficial hardness test (Scales 15N,30N, 45N, 15T,30T and 45T )(jirs/ revision ) 5073:1988 Method forverification ofRockwell superficial hardness testing machines (Scales 15N,30N,45N, 15Tand 45T )(first revision) 5076:1988 Method for calibration ofstandardized blocks tobe used for rockwell superficial hardness testing machines (Scales 15N,30N,45N, 15T,30T and45T )(jhtrevision ) For the purpose of deciding whether a particular requirement of this standard iscomplied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe rounded off value should be the same as that of the specified value inthis standard. IS 1586:2000 Indian Standard METHOD FOR ROCKWELL HARDNESS TEST FOR METALLIC MATERIAL ( SCALES A-B-C-D-E-F-G-H-K 15N, 30N, 45N, 15T, 30T .AND 45T ) ( Third Revision) 1 SCOPE 5 APPARATUS This standard specifies the method for conducting 5.1 Testing Machine the Rockwell hardness test (scalesandhardness range Capable of applying apredetermined force or forces according to Table 1)for metallic materials. within the ranges shown inTable 1and inaccordance NOTE — For certain materials, the hardness range may with Annex A. be narrower than those indicated. 5.2 Sphere-Conical Diamond Indenter 2REFERENCE Inaccordance with Annex Ahaving anangle of 120° The following Indian Standard contains provisions and radius of curvature at the tip of 0.200 mm for which through reference in this text, constitutes A, C, Dand all Nscales. provision of this standard. Atthetime ofpublication, the edition indicated was valid. All standards are 5.3 Steel Ball Indenter subject to revision and parties to agreements based In accordance with Annex A having a diameter of on this standard are encouraged to investigate the 1.5875 mmforB,F,Gandall‘T’scalesand 3.175mm possibility of applying the most recent edition of for E, Hand Kscales. the standard indicated below : 5.4 Measuring Device LSNo. Title See Annex A. 1501(Part 1): Method forVickers hardness testfor 1984 metallic materials: Part 1HVtoHV 6 TEST PIECE 100(second revision) 6.1 The test shall be carried out on a surface which 3 PRINCIPLE issmoothandeven,freefkomoxidescale,foreignmatter The test consists of forcing an indenter ( diamona and, in particular, completely free from lubricants cone or steel ball ) into the surface of atest piece in (except for tests on some reactive materials, such as two steps under specified conditions ( see 7 ) and titanium, where lubricants such as kerosene may be measuring the permanent increase of depth of required ). If lubricants have been used, it shall be indentation. The unit of measurement for e is stated in the test report. 0.002 mm for Rockwell hardness and 0.001 mm for 6.2 Preparation shall be carried out in such a way Rockwell superficial hardness. From the value ofe, a that any alteration of surface hardness due to hot or number known asthe Rockwell hardness isderived. coldworking isminimized. 4 SYMBOLS AND DESIGNATIONS 6.3 The thickness of the test piece or of the layer The symbols and designations used inthis standard under test shall be at least ten times the permanent are given inTables 1and 2and Fig. 1,2, 3and 4. increase of depth e. The minimum thickness of test piece inrelation to the Rockwell hardness is shown 4.1 The Rockwell hardness isdenoted bythe symbol inFig. 5,6 and 7. HR preceded by the hardness value and completed by a letter indicating the scale. After the test, nodeformation shall be visible on the . surface of the test piece opposite to the indentation. Examp[e: 6.4 For tests on convex cylindrical surfaces and 59HRc = Rockwell hardness of59,measured on spherical surfaces, the corrections given inTables 3, the C scale 4, 5, 6 and 7 shall be applied. In the absence of 70HR30N = Rockwell superficial hardness of 70 corrections for tests on concave surfaces, tests on measured on the 30N scale. such surfaces shall be subject to special agreement. 1 1S 1586:2000 Table 1 Hardness Range (Clauses l,4and 5.1 ) . .. — Rockwell Hardness Type of Indenter Preliminary Additional “1’otnl Rockwell Hardness Test Test Test Hardness Scale Force, F. Force, F, Force, F Range N(kgf) N(kgf) N(kgf) (1) (2) (3) (4) (5) (6) (7) A HRA Diamond cone 98.07(10) 490.3(50) 588.4(60) 20 to 88 HRA B HRB Steel ball 1.5875 mm 98.07(10) 882.6(90) 980.7(100) 20 to 100 HRB c HRc Diamond cone 98.07(10) I 373.0(140) I 471.0(150) 20 to 70 HRC D HRD Diamond cone 98.07(10) 882.6(90) 980.7(100) 40 to 77 HRD E HRE Steel ball 3.175 mm 98.07(10) 882.6(90) 980.7(100) 70 to 100 HRE F HRF Steel ball 1.5875 mm 98.07(10) 490.3(50) 588.4(60) 60 to 100 HRF G HRG Steel ball 1.5875 mm 98.07(10) I 373.0(140) I 471.0(150) 30 to 94 HRG H HRH Steel ball 3.175mm 98.07(10) 490.3(50) 588.4(60) 80 to 100 HRH K HRK Steel ball 3.175 mm 98.07(10) 1 373.0(140) 1 471.0(150) 40 to 100 HRK 15N HR15N Diamond cone 29.42(3) 117.7(12) 147.1(15) 70-94 HR15N 30N HR30N Diamond cone 29.42(3) 264.8(27) 294.2(30) 42-86 HR30N 45N HR45N Diamond cone 29.42(3) 411.9(42) 441.3(45) 20-77 HR45N 15T HR15T Steel ball 1.5875 mm 29.42(3) 117.7(12) 147.1(15) 67-93 HRI 5T 30T HR30T Steel ball 1.5875 mm 29.42(3) 264.8(27) 294.2(30) 29-82 HR30T 45T HR45T Steel ball 1.5875 mm 29.42(3) 411.9(42) 441.3(45) 1-72 HR45T Table 2Symbols and Designations ( Clause 4 ) Symbol/ Description Designation (1) (2) a Angle of diamond cone R Radius of curvature at the tip of the diamond cone D Diameter of steel ball F~ Preliminary test force F, Additional test force F Total test force Do Depth of indentation under preliminary test force before application of additional test force h, Increase in depth of indentation under additional test force e Permanent increase ofdepth of indentation under preliminary test force after removal of additional test force, expressed inunits of0.002 mm for Rockwell hardness and 0.00 Imm for Rockwell super- ficial hardness HRA 1 HRc Rockwell hardness = 100- e HRD HRE HRF HRG Rockwell hardness = 130 -– e HI?H HRK , HRN Rockwell superficial hardness = 100 – e HR T 2 1k I ’ 3 a - U ’ -- J u Z’()l &’ ‘v xi - ” + I 9- 0 — 4 g t-- 4 ~ U Hllllllll SS3Nid / IIII‘4II ~ ItiHa_lI/ iI O @ W () H IIi I-1 ----4 ! II0 II II/ Ii IIiI, Ii Ii I w u - u - U Zllll “ ’() ‘1. “ 4 I - -J 1 l - = 1 7 1 - 11 III‘q i1/ IIIII 1 1 1 1 Ii IiII W 1 ! I1 1 I/ IIiIIi J1 IS 1586:2000 I : +--------J ----- -t- ------ \ I *I i I I ------------ --- ---.- i----.--lJ- J--- 1 FIG.3 SURFACEOFTESTPIECEWITHDIAMONDCONE(ROCKWELSLCALF,S15N, 30N AND45N ) IO@ /——— -DATUM LINE + t ------- -- ----- .c- ? 8 . Mu fi e z~ -. ------ ----- 0 5. -Y I o ~ ------- ------- -- [ ------- - FIG.4 SURFACEOFTESTPIECEWITHSTEELBALL(ROCKWELSLCALES15T,30TAND45T ) 4 m m E, C E PI T S E T F O S S E N K C HI T M U M NI MI