## Plain Carbon Steel

If a plain carbon steel test specimen has a tensile strength of 6,000 psi, estimate the Brinell hardness.

##
__
__**Hint**

**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**

**Hint 2**

Divide the tensile strength 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.

$$$HB\simeq \frac{6,000\:psi}{500}\simeq 12$$$

Note the units for HB are in psi or kg/mm^2 (Pascals), but the results are usually reported unitless.

$$$\simeq 12$$$