Difference between cold rolled steel plate and hot rolled steel plate

1, by the carbon content to differentiate

The carbon content of hot-rolled steel plate may be slightly higher than that of cold-rolled steel plate. The density is the same if the composition is the same. But if the difference in composition is huge, such as stainless steel, the density of cold rolled, hot rolled steel is in the range of 7.9 g/cm³ or so. Specifically also depends on the composition, hot-rolled steel sheet simply has better ductility, the steel is also subject to pressure.

2, according to the density is distinguished

Hot rolled steel plate is divided into structural steel, mild steel, welded bottle steel, and then into different types of steel, to find the steel you need, when checking the density and composition of the specific steel.

Hot rolled steel plate has low hardness, easy to machine, good ductility. Hot-rolled steel plate surface quality is almost (with oxidation finish low), but good ductility, generally medium-thick plate, cold-rolled steel 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.

3, through the production process to distinguish the

Hot rolled steel and cold rolled steel production process is different. Hot rolled steel sheet is rolled at high temperature, cold rolled steel sheet is roasted at room temperature. Generally speaking, cold rolled steel sheet has better strength, hot rolled steel sheet has better ductility, China steel spotting network has a detailed difference between hot rolled steel sheet and cold rolled steel sheet offer. The overall thickness of cold rolled steel sheet is smaller, hot rolled steel sheet can have a greater thickness. Cold rolled steel sheet surface quality, appearance, dimensional accuracy is better than hot rolled, and the thickness of its direct rolled products is thinner to 0.18mm or so, so it is more popular. For product acceptance, you can ask the professionals.

Hot rolled steel plate, the mechanical properties are much inferior to the cold process, also inferior to the forging process, but has better toughness and ductility.

Cold rolled steel plate because of a certain degree of hardening, toughness is low, but can achieve a better yield-to-intensity ratio, is used for cold forming springs and other parts, while the yield strength is closer to the ultimate strength, so the use of the process of danger is not expected, in the load exceeds the allowable load is prone to accidents.

Differences:

1) cold rolled steel sheet using cold rolled surface treatment without oxide skin, good quality. Hot rolled steel sheet using hot rolled surface processing surface with oxide skin, the thickness of the sheet has under the difference.

2)Hot rolled steel sheet strength and surface flatness is bad, the price is lower, while cold rolled sheet tensile is good, strength, but the price is more expensive.

3)Rolled steel sheet is divided into cold rolled and hot rolled steel sheet, with recrystallization temperature as the point of differentiation.

4)Cold rolled: cold rolled steel sheet: cold rolled steel is generally used to produce strip, the rolling speed is higher.

Hot rolled steel plate: hot rolling and forging temperature

5)The surface of hot rolled steel sheet without coating becomes blackish brown, the surface of cold rolled steel sheet without coating becomes gray, after coating can be distinguished by the surface smoothness, and the smoothness of cold rolled steel sheet is higher than that of hot rolled steel sheet.