Galvanized and Cold Rolled Steel:
All steels are alloys of carbon and iron, but different steel products may differ in terms of their composition or the processes used to make them. Two common types of steel are galvanized and cold-rolled steel. Each type is prepared through a different process and has its own benefits and applications.
Hot-dip galvanized (HDG)
Hot-dip galvanized (HDG) steel is often simply referred to as galvanized steel, but its exact name is more accurate. HDG steel products are created by immersing a steel product in a vat filled with molten zinc. A thin layer of zinc adheres to the steel and oxidizes rapidly in the surrounding atmosphere. The oxidation-reduction potential of zinc is lower than that of iron; This means that it reacts more easily with oxygen in the air, providing protection to the underlying steel and significantly extending its lifespan.
Cold rolling
Cold rolling steel is a forming process used to make steel more suitable for its intended use. Cold rolling is a process that occurs after the steel has recrystallized, but it can still be hot. The steel is passed through sets of cylinders that change their shape slightly, allowing the production of shapes such as cylinders, I-beams and plates.
The steel is passed through sets of cylinders that change their shape slightly, allowing the production of shapes such as cylinders, I-beams and plates. This process is comparable to other methods of forming steel. The steel is passed through sets of cylinders that change their shape slightly, allowing the production of shapes such as cylinders, I-beams and plates. The type and arrangement of the rollers used determine the final shape of the steel.
Cold rolling and galvanizing are not mutually exclusive. In fact, cold-rolled steel can be galvanized because cold-rolling is a technique for shaping steel, while hot-dip is a technique that treats it to protect it from corrosion. Galvanized steel generally has much better corrosion resistance, but is less suitable for high temperature conditions. Although susceptible to damage and scratches, the zinc layer will continue to protect against corrosion.
Force
Although cold-rolled steel can be galvanized, the products you buy from galvanized steel can also be shaped through hot rolling. Compared with cold rolling, hot rolled steel has higher yield strength and less grain deformation, because cold rolling crushes the steel, and thus the microscopic "grain structure" resembles an oval shape. Cold rolled steel has superior directional strength, which is valuable for some high-load applications. Cold rolled steel also has a superior surface finish compared to hot rolled steel.
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