A steel bar is a strip of steel, a type of building material. For example, in reinforced concrete, the skeleton used to support the structure. Steel bars are tensile but not compressive, concrete is compressive but not tensile, the combination of the two has good mechanical strength, the steel is protected by the concrete and will not rust, and the thermal expansion coefficient of the steel and concrete is approximately the same, and it will not produce rust. Corrosion due to cracks, so it has become an ideal material for modern buildings, and has become a widely used reinforced concrete building.
Carbon steel, also known as carbon steel, is an iron carbon alloy with an internal carbon content of nearly 2%. In addition to carbon, carbon steel contains many other elements, such as manganese, sulfur, or silicon. Generally speaking, the higher the amount of carbon contained in carbon steel, the greater its hardness, the higher the strength will be produced. Just note that the higher the carbon content, the lower the plasticity.

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