Strength Estimate
If a plain carbon steel test specimen has a Brinell hardness of 5, estimate the tensile strength in psi.
Expand Hint
The relationship between hardness and tensile strength is roughly:
$$$TS\:(psi)\simeq 500\:HB$$$
where
$$TS$$
is the tensile strength in psi, and
$$HB$$
is the Brinell hardness number.
Hint 2
Multiply the Brinell hardness in the problem statement by 500.
For plain carbon steels, the relationship between hardness and tensile strength is roughly:
$$$TS\:(psi)\simeq 500\:HB$$$
where
$$TS$$
is the tensile strength in psi, and
$$HB$$
is the Brinell hardness number.
$$$TS\simeq 500(5)psi\simeq 2,500\:psi$$$
Note the units for HB are in psi or kg/mm^2 (Pascals), but the results are usually reported unitless.
$$$\simeq 2,500\:psi$$$
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