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Hot rolled vs. cold rolled steel – What’s the difference?

The properties of metal are highly dependent on the chemical composition. However, even if the steel grades are the same, the manufacturing process does have a major influence on the characteristics of steel, as well. Prefabricated steel products can be finished by different processes, such as cold and hot rolling.

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Carbon Steel

Carbon steels are steel grades with a carbon content of up to 2.1% by weight. Carbon steel does not contain any minimum amount of other alloying elements, such as chromium, cobalt, molybdenum or tungsten. Nonetheless, it often contains manganese. However, the maximum amount of manganese in the metal should not exceed 1.65% by weight. Further, the amount of silicon and copper should be less than 0.6% by weight.

With the rise of the carbon amount in the steel, the hardness of the workpiece increases. However, the weldability and ductility reduces with higher carbon content.

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Passivation of stainless steel

Passivation is a finishing process for stainless steel and other metals. By removing free iron and thus increasing the chromium content in the metal, passivation improves the natural corrosion resistance of stainless steel.

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Diffusion Bonding

Diffusion bonding is a welding technique which is primarily used in metal working. Diffusion bonding operates on the principle of solid-state diffusion and makes it possible to join two similar or dissimilar metals. It is widely applied in aerospace and the nuclear industry.

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Salt Spray Test

The salt spray test, also known as the salt fog test, is a common corrosion testing method. The accelerated standardized testing method is one of the most proven and widespread procedures for testing and comparing corrosion resistance in a constant environment.

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