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Hardness Testing - Rockwell 15T Scale

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astm (american society for testing and materials), astm e140 - standard hardness conversion tables, hardness testing, sae ams 2658 - hardness testing
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Old 11th September 2013, 02:03 PM
lawright

 
 
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Please Help! Hardness Testing - Rockwell 15T Scale

AMS 2658 Table 1 Note 3 states that the HR15T values are for parts up to .032 in nominal thickness.
Does this mean that you should not use the Rockwell 15T scale for thicknesses higher than .032 or should we use the ASTM E140 conversion tables to determine the Rockwell 15T scale hardness value for example 6061 T4 .063 thick

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  Post Number #2  
Old 11th September 2013, 02:56 PM
Mikishots's Avatar
Mikishots

 
 
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Re: Hardness Testing - Rockwell 15T Scale

Quote:
In Reply to Parent Post by lawright View Post

AMS 2658 Table 1 Note 3 states that the HR15T values are for parts up to .032 in nominal thickness.
Does this mean that you should not use the Rockwell 15T scale for thicknesses higher than .032 or should we use the ASTM E140 conversion tables to determine the Rockwell 15T scale hardness value for example 6061 T4 .063 thick
15T is only applicable to material gauges less than 0.032". The 15kg load and ball size is not suitable for higher thicknesses and will not return meaningful results.

If you need to test 6061 T4 for thicknesses over 0.032", you can use the E-60 minimum.

Last edited by Mikishots; 11th September 2013 at 03:07 PM.
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