Hot Rolled Steel vs. Cold Rolled Steel

An Overview of Hot Rolled Steel

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Hot rolled steel is steel that has undergone the rolling process at a temperature above its recrystallization temperature (usually ° F or greater). Compared to unprocessed steel, the processed material exhibits greater formability and workability, making it easier to work with in subsequent processing operations.

The hot rolling process starts with a large, rectangular slab of metal referred to as a billet. First, the billet is heated and compressed into a large roll. While still hot, it passes through a series of rotating rollers to achieve the desired dimensions. In sheet metal production operations, the rolled steel is then wound into coiled rolls and left to cool. In production operations involving other forms, the processed material is cut into the specified units and packaged.

Benefits of Hot Rolled Steel

Hot rolled steel offers several manufacturing advantages, such as:

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• Lower cost: Hot rolled steel tends to be less expensive than cold rolled steel since it involves less processing.
• Better workability: As the hot rolling process occurs at elevated temperatures, the processed material is easy to form and shape.
• Little to no internal stress: The hot rolling process involves cooling the steel gradually, which allows the material to essentially normalize its structure and become free of internal stresses.

Applications of Hot Rolled Steel

Since hot rolled steel shrinks slightly during the cooling stage, there is a lesser degree of control over its final shape. For this reason, it is typically used in applications that do not require extremely tight tolerances, such as:

• Agricultural equipment
• Automobile parts (e.g., frames and wheel rims)
• Construction materials (e.g., I-beams)
• Railroad equipment (e.g., tracks and railcar components)

If you use hot rolled, a half hour bath in muriatic acid solution is enough to get rid of it (50:50 mix with water - you can add propylene glycol or isopropyl alcohol to keep it from freezing if that&#;s an issue). Then just rinse with water (you can also do a dip in a sodium carbonate - baking soda solution to counteract the acid but a good water wash is enough).

You can get a plastic tub from a farm store like Tractor Supply or a small water &#;pond&#; from Home Depot that will hold the 2x2 stock we can fit on the Crossfire. You only need a few inches of solution - just lay the steel in the tray and have the solution cover it.

The scale dissolves and you&#;ll have nice clean steel.

One thing though - keep your tray & solution covered. The fumes will attack any unprotected metal nearby. You should also use a respirator if you&#;re spending much time doing this. Always wear nitrile gloves.

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