In terms of steel quality and price, hot-rolled steel is generally considered to be the best available.
Hot rolling is a process that’s used to make steel. It involves heating metal until it gets soft and stick, and then shaping it with a series of rolling processes. The metal becomes stronger as the temperature rises during these procedures, but at the same time it becomes more susceptible to shrinking. Because of this contrast in properties – strength and shrinking – hot rolling is often cheaper than cold rolling.
Cold Rolled Steel
Cold-rolled steel is a material that is further processed, with cooling. This process will produce the product with closer tolerances, and a wider range of finishes. The term “Cold-Rolled” is misapplied to all products when in fact, it refers to rolling flat sheets and coils into finished goods.
Cold drawing is a low-cost way to increase the yield and tensile strength without the need for thermal treatment after.
When referring to bar products, the term used is “cold finishing”, which usually consists of cold drawing and/or turning, grinding and polishing. This process results in higher yield points, increases the saving capacity, enrichment rate and has four main advantages:
Projects where tolerances, surface condition, concentricity, and straightness are major factors.