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Hardness Conversion Calculator






Enter value, select the conversion and click on calculate. Result will be displayed. Above conversions are for Austenitic Stainless Steel and formulas as per ASTM E140. HRB = Rockwell Hardness, HB = Brinell hardness


From
To
1) Standard Hardness Conversion for metals acc. ASTM E 140 - 97, September 1999, Conversion for Non-Austenitic Steels, Table 1. The accuracy of the conversion depends on the accuracy of the provided data and the resulting curve-fits.
2) Indentation hardness is not a single fundamental property but a combination of properties, and varies with the type of test. The modulus of elasticity and the depth of indentation influence conversions. Therefore separate conversion tables are neccessary for different materials.
3) Brinell Hardness numbers in parentheses are outsite the range (HB>630) This limit is set to avoid errors introduced by the deformation of the ball indenter itself.



Rockwell Superficial Hardness Scales
ScaleIndenter TypeMinor Load
F0
kgfMajor Load
F1
kgfTotal Load
F
kgf
Value of
E
HR 15 NN Diamond cone31215 100
HR 30 NN Diamond cone32730 100
HR 45 NN Diamond cone34245 100
HR 15 T1/16" steel ball31215 100
HR 30 T1/16" steel ball32730 100
HR 45 T1/16" steel ball34245 100
HR 15 W1/8" steel ball31215 100
HR 30 W1/8" steel ball32730 100
HR 45 W1/8" steel ball34245 100
HR 15 X1/4" steel ball31215 100
HR 30 X1/4" steel ball32730 100
HR 45 X1/4" steel ball34245 100
HR 15 Y1/2" steel ball31215 100
HR 30 Y1/2" steel ball32730 100
HR 45 Y1/2" steel ball34245 100



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UNS N08810 800H UNS N08810 Nickel Alloy Seamless Tubes
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UNS N08825 825 2.4858 Nickel Alloy Seamless Tubes
UNS N06600 600 2.4816 Nickel Alloy Seamless Tubes
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UNS N10276 C-276 2.4819 Nickel Alloy Seamless Tubing
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