That's the surest way of telling (and usually, hot-rolled steel is more likely to have rusted). Also, no sheet that's 3/16" or thicker (roughly thicker than gauge 7) can be a cold-rolled sheet.zwwzli said:I know hot-rolled has rougher surface than cold, but anthing else?
The main difference between hot-rolled steel and cold-rolled steel is the manufacturing process. Hot-rolled steel is made by heating the steel above its recrystallization temperature, which allows it to be easily shaped and formed. Cold-rolled steel, on the other hand, is made by rolling the steel at room temperature, resulting in a smoother and stronger product.
Visually, hot-rolled steel will have a rough and scaly surface due to the high temperatures used in its production. Cold-rolled steel, on the other hand, will have a smoother and more polished surface. Additionally, hot-rolled steel may have a slightly rounded edge, while cold-rolled steel will have sharp edges.
Hot-rolled steel is generally more malleable and easier to work with than cold-rolled steel due to its higher temperatures during production. This makes it a preferred choice for projects that require extensive shaping and forming, such as construction and automotive industries.
Yes, the difference in manufacturing process does affect the strength of the steel. Hot-rolled steel has a higher yield strength and is generally stronger than cold-rolled steel. However, cold-rolled steel is often used for applications that require a higher degree of precision and a smoother surface, such as in the production of appliances and electronics.
The best type of steel for your project will depend on your specific needs and requirements. If you need a strong and malleable material that can withstand high temperatures, hot-rolled steel may be the better choice. If your project requires a smoother surface and tighter tolerances, cold-rolled steel may be the better option. It is always best to consult with a professional or do thorough research before selecting a type of steel for your project.