Hardness testing - Indentec

1 HRA HRB HRC HRD HR15N HR30N HR45N HV HB Rm

2 HRA HRB HRC HRD HR15N HR30N HR45N HV HB Rm HRA HRB HRC HRD HR15T HR30T HR45T HV HB Rm

3 0 10 20 30 40 50 60 70 80 90 100 110 120 (mm) 4150 AKZHR valve testingZHV, ZHR handling Nano testerZHU250 ZHV30/zwicki-LineZHR JominyZHV ZHU topLineMeasurement quantityRockwell Hardness HR.

4 The inden-tation depth h is measured in = N - h/SN .. Numerical value (determined for each Rockwell method)h .. Remaining indentation depth in mmS .. Scale value in mmThis value is the change in inden-tation depth in mm that corres-ponds to one Rockwell ,D,A = 100 - HRG,B,F,K,E,H = 130 - ,T = 100 - quantityBrinell Hardness HB. Two diame-ters, at right angles to one another, of the remaining indentation in the specimen surface are = F/A = 2F/ ( D(D- D -d ))F .. Test load in NA .. Indentation surface in mm D .. ball indentor dia. in mmd .. arithmetic average from two measured indentation Measurement quantityVickers Hardness HV. The lengths of both diagonals of the remaining test indentation are = F/A = F/d F .. Test load in NA .. Indentation surface in mm d .. Arithmetic average value of the diagonal lengths in mmFd1d2 MeasurementPositionLoadingpositionInitia lpositionLoadingpositionMeasurementposit ionhReference levelF0 FmF0Fd1d2 MeasurementpositionLoadingpositionapplic ation area:minimum thickness:Reference levelInitial positionLoading positionMeasurement positionF0 FmF0 FLoading positionMeasurement positionminimum specimen thickness:application area:indentation distances:Loading positionMeasurement positionapplication area:minimum specimen thickness:indentation distances:indentation 3d (steel, copper) 5d 6d (light metal)dd.

5 H 7 mm 3 mm HRC, D, A, 1 oder 2 mm 3 mm = cone15h = 3d h8htokenindenterpre-force [N]total-load [N]scale rangeHRCdiamond HRCHRD diamond HRDHRA diamond HRYHRG1/16" HRGHRB1/16" HRBHRF1/16" HRFHRK1/8" HRKHRE1/8" HREHRH1/8" HRHHR15 Ndiamond HR15 NHR30 Ndiamond HR30 NHR45 Ndiamond HR45 NHR15T1/16" HR15 THR30T1/16" HR30 THR45T1/16" HR45 THardness testingIntelligent TestingRockwell ISO 6508 / ASTM E 18 Vickers ISO 6507 / ASTM E 384 Brinell and UniversalISO 6506 / ASTM E 10No responsibility is taken for the correctness of this information. All data at ambient temperature. All rights reserved. Copyright by Zwick 2012 Indentec Hardness testing Machines LimitedUnit 30 Navigation Drive, Hurst Business Park, Brierley Hill, West Midlands, DY5 1 UTUKP hone +44 (0) 1384 484 070 Fax +44 (0) 1384 481 ASMEC Advanced Surface Mechanics GmbHBautzner Landstrasse 45D-01454 RadebergGermanyPhone +49 (0) 351 2695 345 Fax +49 (0) 351 2695 GmbH & Co.

6 KGAugust-Nagel-Strasse 11D-89079 UlmGermanyPhone +49 (0) 73 05-10-0 Fax +49 (0) 73 Ball Scales (HRB, HRF, etc.)Rockwell Diamond Scales (HRA, HRC, etc.)HRN Superficial Rockwell ScalesHardnessMinimum ThicknessThe above graphs are based on the internationally accepted recommendation that specifies a minimum thick-ness, not less than ten times (fifteen times) the depth indentation using a cone indenter (ball indenter). It is also recommended that the indentation causes no visible mark or deformation on the under surface of the test Thickness Requirementsaverage indentation diameterminimum specimen thickness (mm)for BrinellConversion of Hardness to Hardness and Hardness to tensile strenght for unalloyed and low-alloy steels and cast iron (extract of ISO 18265 table )HRT Superficial Rockwell Scales