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difference between plated steel and hot rolled,Plated Steel and Hot Rolled: An Overview Plated steel and hot rolled steel are two different types of steel with distinc

Plated Steel and Hot Rolled: An Overview

Plated steel and hot rolled steel are two different types of steel with distinct characteristics. Hot rolled steel is made by heating steel above its recrystallization temperature and then rolling it into the desired shape. This process gives hot rolled steel a rough surface finish. It is often used in applications where a high level of strength is required, such as in construction for beams and columns.

On the other hand, plated steel has a thin layer of another metal (like zinc in the case of galvanized steel) plated onto its surface. This plating serves different purposes. For example, if it's zinc - plated, it provides corrosion resistance. Plated steel is commonly used in applications where both a certain level of strength and protection against rust are needed, like in some automotive parts or outdoor furniture.

Quality and Appearance Differences

The quality of hot rolled steel is mainly determined by its chemical composition and the rolling process. It has a natural oxide scale on its surface which can be removed if a smoother finish is desired. Hot rolled steel may have some surface irregularities. Plated steel, due to the plating process, has a more uniform and often smoother surface appearance. The plating also enhances its durability in certain environments.

Manufacturing Processes

As mentioned, hot rolled steel is made through heating and rolling. The manufacturing process of plated steel is more complex. First, the base steel is produced through traditional methods like hot rolling or cold rolling. Then, it goes through a plating process which can be done through electroplating or hot - dipping. Electroplating is a more precise process and is often used for thinner plating layers, while hot - dipping can create a thicker and more durable plating layer.

Cost Considerations

Hot rolled steel is generally less expensive to produce than plated steel. This is because the plating process adds additional steps and materials. However, in the long run, plated steel may be more cost - effective in applications where corrosion resistance is crucial. For example, if a structure made of hot rolled steel without proper protection corrodes quickly, the cost of replacement or repair can be high, while plated steel may last longer without such issues.

Questions and Answers

Question 1: Can hot rolled steel be as corrosion - resistant as plated steel?

Answer: Generally, no. Hot rolled steel does not have an inherent corrosion - resistant layer like plated steel. It can be treated to improve its corrosion resistance, but it will not be as effective as the plating on plated steel without significant additional processing.

Question 2: Why is hot rolled steel rougher than plated steel?

Answer: Hot rolled steel is rougher because of the hot rolling process. During this process, the steel is heated and rolled at high temperatures, which results in a natural oxide scale and surface irregularities. Plated steel has a plating layer that can smooth out the surface and give it a more uniform appearance.