Hot-Rolled steel has been rolled at high temperature from a cast steel slab more than two inches thick into a steel coil as thin as 1/16 inches thick.
Because the steel is rolled hot, and the reduction from slab to coil is great, the coil surfaces are noticeably rough and slightly oxidized.
Hot-rolled steel is used where precise shapes and tolerances are not required. Hot rolled steel is cheaper than cold rolled steel because it is not processed after it is hot-rolled except for pickling when required to remove surface scale.
Figure. Elongation of 10XX steels decreases as Yield Strength increases
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