Disadvantages of Hot Rolled Steel

Hot-rolled steel is a commonly used material in construction and manufacturing due to its strength and versatility. However, like any material, it has its disadvantages:

1. Shape Limitations: Hot-rolled steel sheets and plates typically have a rougher surface texture compared to cold-rolled steel. This texture is known as "scale" and can limit the material's use in applications where a smooth finish is required.

2. Dimensional Accuracy: Hot-rolling processes can result in less precise dimensions compared to cold-rolled or extruded steel. The steel can also experience some spring-back after rolling, which can affect the final dimensions of the product.

3. Thickness Variation: There can be variations in the thickness of hot-rolled steel products, especially in wider sheets, which may not be suitable for applications that require strict dimensional control.

4. Lower Strength: While hot-rolled steel is strong, it generally has lower yield and tensile strengths compared to cold-worked steel. This can be a limiting factor for applications that require high strength-to-weight ratios.

5. Machinability: Hot-rolled steel can be more challenging to machine, mill, and drill due to its higher carbon content and harder surface compared to cold-rolled steel. This can result in increased wear on cutting tools and slower processing times.

6. Weathering and Corrosion: The surface of hot-rolled steel is not typically protected by a layer of scale as it is with cold-rolled steel. This can make it more susceptible to weathering and corrosion, especially if not coated or treated after rolling.

7. Cost: The cost of hot-rolled steel can be higher than cold-rolled steel, especially for applications that require precise dimensions or a smooth finish, as may necessitate additional processing steps.