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Difference between cold rolled steel plate and hot rolled steel plate
Release time:
2024-07-10
First, through the carbon content to distinguish
Hot rolled steel plate carbon content can be slightly higher than cold rolled steel plate. Density is the same in the case of composition is not the same. But if the difference in composition is huge, such as stainless steel, cold-rolled, hot-rolled steel density are in the 7.9g/cm3 or so. Specifically also depends on the composition, hot-rolled steel is just better ductility, steel is also subject to pressure.
Second, through the density to distinguish
Hot rolled steel plate is divided into structural steel, mild steel, welded bottle steel, and then according to a variety of steel to find the steel you need, in checking the density and composition of the specific steel.
Hot rolled steel plate is low hardness, easy to process, good ductility. Hot rolled steel plate surface quality is almost (with oxidized finish low), but good plasticity, generally medium thick plate, cold rolled plate, high strength, high hardness, high surface finish, generally thin plate, can be used as a stamping plate.
Cold rolled plate hardness, processing is relatively difficult, but not easy to deform, high strength.
Third, through the production process to distinguish
Hot rolled steel and cold rolled steel production process is different. Hot rolled steel plate is rolled at high temperatures, cold rolled is fried at room temperature. Generally speaking, cold rolled steel plate has better strength, hot rolled steel plate has better ductility, China Steel Spot has a detailed distinction between hot rolled steel plate and cold rolled steel plate offer. Cold rolled is generally smaller thickness, hot rolled can have a larger thickness. Cold rolled steel plate surface quality, appearance, dimensional accuracy are better than hot rolled plate, and the thickness of its products right rolled thin to 0.18mm or so, so more popular. For product acceptance, you can ask the professionals.
Hot rolled steel plate, the mechanical properties are far less than the cold process, also inferior to the forging process, but has a better toughness and ductility.
Cold rolled steel plate due to a certain degree of work hardening, toughness is low, but can achieve a better yield-to-intensity ratio, used to cold-formed spring sheet and other parts, while the yield point is closer to the tensile strength, so the use of the process of danger is not foreseeable, in the load exceeds the permissible load is prone to accidents.
Difference:
1) cold plate using cold rolled processing surface without oxidized skin, good quality. Hot rolled steel plate using hot rolled processing surface with oxide skin, plate thickness has under the difference.
2) hot rolled steel plate toughness and surface flatness is poor, the price is lower, while the cold rolled plate stretching is good, toughness, but the price is more expensive.
3)Rolling is divided into cold rolled and hot rolled steel plate, with the recrystallization temperature as the point of differentiation.
4)Cold rolled: cold rolled is generally used for the production of strip, its rolling speed is higher.
Hot rolled steel plate: the temperature of hot rolling and forging
5)The surface of hot rolled steel plate without plating becomes blackish brown, the surface of cold rolled plate without plating is gray, after plating can be distinguished from the smoothness of the surface, the smoothness of cold rolled plate is higher than that of hot rolled steel plate.
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