Rockwell Minimum Thickness Specifications for Hardness Testing

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hardness thickness

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<ul><li><p>Home Rockwell Tester Brinell Tester Micro Hardness Tester Custom/Automatic Calibration/Service Contact</p><p>Rockwell Minimum Thickness- Reference Information and Standards -</p><p>Minmum thickness is one of the frequently overlooked aspects of hardness testing. As a rule</p><p>users need to maintain a sample thickness at least ten times the maximum depth of</p><p>indentation unless it is known that a material with a thinner thickness will provide the same</p><p>result. The chart below provides ASTM specifications as found in ASTM E18.</p><p>This mimum thickness is often overlooked since operators will get a "result" with when their</p><p>material is too thin to test accurately, but it will be affected by the test anvil hardness. There</p><p>are times when there is no choice and a non-standard result is better than no result. In this</p><p>case operators may use multiple layers of the same material to get a better thickness and a</p><p>non-ASTM E-18 result. For testing some thin soft sheet materials made of tin users have</p><p>standardized on using a diamond spot anvil and a steel ball -- the idea being that the diamond</p><p>spot anvil provides the most consistent "bad" result so the operators have a better feel for</p><p>performance of the material.</p><p>Thickness Rockwell Scale</p><p>Inch Metric HRC HRA HRB HRF 15N 30N 45N 15T 30T 45T</p><p>0.006 0.150 -- -- -- -- 92 -- -- 91 93 --</p><p>0.008 0.200 -- -- -- -- 90 -- -- 86 78 --</p><p>0.010 0.250 -- -- -- -- 88 -- -- 81 62 --</p><p>0.012 0.300 -- -- -- -- 83 82 77 75 44 71</p><p>0.014 0.360 -- -- -- -- 76 78.5 74 68 24 62</p><p>0.016 0.410 -- 86 -- -- 68 74 72 -- -- 53</p><p>0.018 0.460 -- 84 -- -- -- 66 68 -- -- 43</p><p>0.020 0.510 -- 82 -- -- -- 57 63 -- -- 31</p><p>0.022 0.560 69 78 -- -- -- 47 58 -- -- 18</p><p>0.024 0.610 67 76 94 98 -- -- 51 -- -- 4</p><p>0.026 0.660 65 71 87 91 -- -- 37 -- -- --</p><p>0.028 0.710 62 67 80 85 -- -- 20 -- -- --</p><p>0.030 0.760 57 60 71 77 -- -- -- -- -- --</p><p>0.032 0.810 52 -- 62 69 -- -- -- -- -- --</p><p>0.034 0.860 45 -- 52 -- -- -- -- -- -- --</p><p>0.036 0.910 37 -- 40 -- -- -- -- -- -- --</p><p>0.038 0.960 28 -- 28 -- -- -- -- -- -- --</p><p>0.040 1.020 20 -- -- -- -- -- -- -- -- --</p><p>Rockwell Hardness Chart (plus a PDF)</p><p>(aka Hardness Scale Conversion Chart)</p><p>Round Correction Factor</p><p>Hardness Minimum Thickness</p><p>ASTM Hardness Test Methods</p><p>Rockwell Hardness Scales</p><p>Brinell Hardness Chart (plus a PDF)</p><p>Rockwell Hardness Testing</p><p>Brinell Hardness Testing</p><p>Microhardness Testing</p><p>Over Half a Century in Hardness Testers and Quality ControlContact UsAbout Quality Solutions Home Page</p><p> Quality Solutions 2011, All Rights Reserved. All information is subject to change. Privacy</p><p>Rockwell Minimum Thickness Specifications for Hardness Testing http://www.qs-hardnesstester.com/hardness-minimum-thickness.html</p><p>1 of 2 2/26/2015 12:56 PM</p></li><li><p>Rockwell Minimum Thickness Specifications for Hardness Testing http://www.qs-hardnesstester.com/hardness-minimum-thickness.html</p><p>2 of 2 2/26/2015 12:56 PM</p></li></ul>

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