eFunda: Convert Hardness: Tensile Strength (Approx.)
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Tensile Strength (Approximation) 
Symbol:  Approx. TS 

An approximate relationship between the hardness and the tensile strength (of steel) is,

where HB is the Brinnell Hardness of the material, as measured with a standard indenter and a 3000 kgf load.

Convert   Approx. TS     MPa  
(suggested range: 390 ~ 2450 MPa)
  Approx. TS   1420   MPa   approximately*
Hardness
Symbol Amount Name Suggested
Range
HB (3000)  408   Brinell 10 mm Standard 3000 kgf  80~445
HB (500)  >> Brinell 10 mm Standard 500 kgf  89~189
HB (Tungsten 3000)  408   Brinell 10 mm Tungsten 3000 kgf  80~620
HB (Indentation)  3.04 mm   Brinell Indentation  6~2
HK  452   Knoop  97~920
HM  4   Mohs  1~10
HRA  72   Rockwell A-Scale  59~86
HRB  >> Rockwell B-Scale  41~100
HRC  44   Rockwell C-Scale  19~69
HRD  58   Rockwell D-Scale  39~77
HRF  >> Rockwell F-Scale  88~100
HR-15N  82   Rockwell Superficial 15N  69~94
HR-15T  >> Rockwell Superficial 15T  77~93
HR-30N  63   Rockwell Superficial 30N  41~85
HR-30T  >> Rockwell Superficial 30T  53~82
HR-45N  48   Rockwell Superficial 45N  19~76
HR-45T  >> Rockwell Superficial 45T  28~71
HS  58   Shore Scleroscope  17~97
HV  432   Vickers  20~1800

Legend
<< The hardness value is below the acceptable range of the particular hardness scale.
>> The hardness value is above the acceptable range of the particular hardness scale.
### The hardness value is near the limit (within 15%) of the acceptable range of the particular hardness scale.
* The many hardness tests listed here measure hardness under different experimental conditions (e.g. indenters made in different sizes, shapes, and materials, and applied with different loads) and reduce their data using different formulae. As a result, there is NO direct analytic conversion between hardness measures. Instead, one must correlate test results across the multiple hardness tests.

This calculator is based on hardness data compiled from ASM Metals Reference Book 3rd ed, published by ASM International, and Machinery's Handbook 25th ed, published by Industrial Press. The calculator curve-fits multiple hardness data onto a common polynomial basis and then performs an analytic conversion. The accuracy of the conversion depends on the accuracy of the provided data and the resulting curve-fits, and on the valid ranges spanned by the different hardness tests. Converted hardness values should be used for comparative purposes only.

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