NewSonic SonoDur2 - Hardness Scales and Limits

NewSonic SonoDur2 Issue 04 09/2016 Page 67
11.3 Hardness Scales and Limits
Conversion limits:
The Vickers scale is the basis for all conversions. Currently, the conversion tables for low-alloy steel
are entered. Depending on the specific requirements, conversion ranges and new material tables can
be generated.
Measurement range, in HV (UCI): 10 – 2000 (1 - 9999)
Minimum conversion: 80 HV = 76 HB, maximum conversion: 940 HV = 68 HRC (for low-alloy steel,
table A1 EN ISO 18265).
Conversion rules according to EN ISO 18265 for low-alloy steel:
Scale
HB
HRB
HRF
HRC
HRA
HRD
HR45N
Rm [MPa]
HK
Min
76
41
82,6
20,3
60,7
40,4
19,9
255
-
Max
618
105
115,1
68,0
85,6
76,9
75,4
2180
-
Table 11-2
Conversion rules according to ASTM 140-07 for low-alloy steel:
Scale
HB
HRB
HRF
HRC
HRA
HRD
HR45N
Rm [MPa]
HK
Min
100
55
88,2
20,0
37,2
40,1
19,6
-
112
Max
739
100
99,6
68,0
85,6
76,9
75,4
-
920
Table 11-3
Attention:
Conversion tables according EN ISO 18265 and ASTM E140 are defined over different
ranges for different material tables. For all SonoDur instruments the Vickers scale (HV) is
the reference scale and for every measurement there is always a Vickers value. If there
exists no pairs of values in HRC, HB etc. for conversion, a value will be generated using
extrapolation algorithm. If this is unsuccessful, the user should switch to another hardness
scale or select the Vickers scale. Values which are generated by extrapolation algorithm
are not covered by standards and do have a higher uncertainty. Therefor these values are
displayed in red and it is up to the user to decide whether to use these values or not.
Your Complete Source for
Testing Equipment. Since 1969!
www.BergEng.com
Berg Engineering & Sales Company, Inc.
Tel 847-577-3980
info@bergeng.com