Brinell Hardness
If a plain carbon steel test specimen has a Brinell hardness of 10, estimate the tensile strength in MPa.
Expand Hint
The relationship between hardness and tensile strength is roughly:
$$$TS\:(MPa)\simeq 3.5\:HB$$$
where
$$TS$$
is the tensile strength in MPa, and
$$HB$$
is the Brinell hardness number.
Hint 2
Multiply the Brinell hardness number in the problem statement by 3.5.
For plain carbon steels, the relationship between hardness and tensile strength is roughly:
$$$TS\:(MPa)\simeq 3.5\:HB$$$
where
$$TS$$
is the tensile strength in MPa, and
$$HB$$
is the Brinell hardness number.
$$$TS\simeq 3.5(10)MPa\simeq 35\:MPa$$$
Note the units for HB are in psi or kg/mm^2 (Pascals), but the results are usually reported unitless.
$$$\simeq 35\:MPa$$$
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