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The hot rolling process primarily involves heating the steel above its recrystallization temperature and then shaping it as it cools. This method results in a refined grain structure, which enhances the yield strength and ductility of the resulting rebar. The elevated temperatures during hot rolling allow the steel to be easily manipulated, and upon cooling, the material stabilizes into a strong and resilient form.

While hot rolling does contribute to better ductility and is often associated with decreased manufacturing costs due to automated processes, the most significant and direct effect is typically the increase in strength due to the improved microstructural properties. This enhanced strength is crucial for structural applications where the load-bearing capacity of the rebar is a primary concern.