There are 3 differences between cold rolled steel and hot rolled steel.

1. The two are substantially different:

(1) The essence of cold-rolled steel: Cold-rolled steel is the steel produced by cold-rolling. Cold rolling is a steel sheet in which the steel sheet is further thinned to a target thickness at room temperature.

(2) The essence of hot-rolled steel: Hot-rolled steel is a kind of steel that is rolled above the recrystallization temperature.

2. The characteristics of the two are different:

(1) Features of cold-rolled steel: The thickness of cold-rolled steel is more accurate, the surface is smooth and beautiful, and it also has various superior mechanical properties, especially in terms of processing performance.

(2) Features of hot-rolled steel: During hot-rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the as-cast state are broken, the cracks are healed significantly, the casting defects are reduced or eliminated, the as-cast structure is transformed into a deformed structure, and the processing performance of the alloy is improved.

3. The processing requirements of the two are different:

(1) Processing requirements of cold-rolled steel: Cold-rolled steel requires high rolling mill power and low rolling efficiency, and intermediate annealing is required to eliminate work hardening during the rolling process, so the cost is also high.

(2) Processing requirements of hot-rolled steel: hot-rolled steel is easy to roll and has high rolling efficiency. The hot-rolling temperature includes the opening temperature and the final rolling temperature. The determination of the opening temperature is mainly based on the solidus temperature in the alloy phase diagram. The final rolling temperature should be determined according to the plasticity diagram of the alloy, and it is generally required to be controlled above the recrystallization temperature of the alloy.

Second, the use of cold-rolled steel and hot-rolled steel:

1. Use of hot rolled steel:

(1) Structural steel: mainly used in the production of steel structural parts, bridges, ships and vehicles.

(2) Weathering steel: adding special elements (P, Cu, C, etc.), with good corrosion resistance and atmospheric corrosion resistance, used in the production of containers, special vehicles, and also used in building structures.

(3) Steel for automobile structure: high-strength steel plate with good stamping performance and welding performance, used in the production of automobile FRAME, WHEEL, etc.

(4) Hot-rolled special steel: carbon steel, alloy steel and tool steel for general mechanical structures, which are used in the production of various mechanical parts after heat treatment.

(5) Cold-rolled original plate; used to produce various cold-rolled products, including CR, GI, color-coated plates, etc.

(6) Steel plate for steel pipe: It has good processing performance and compressive strength, and is used to produce high-pressure gas pressure vessels filled with LPG, acetylene gas and various gases with an inner volume of less than 500L.

(7) Steel plate for high-pressure vessels: It has good processing performance and compressive strength, and is used to produce high-pressure gas pressure vessels filled with LPG, acetylene gas and various gases with an inner volume of less than 500L.

(8) Stainless steel plate: Stainless steel has good corrosion resistance and is mainly used in the food industry, surgical equipment, aerospace, petroleum, chemical and other industries.

2. Uses of cold rolled steel:

Cold-rolled strips are widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, and canned food. Cold-rolled sheet is the abbreviation of ordinary carbon structural steel cold-rolled sheet, also known as cold-rolled sheet, commonly known as cold-rolled sheet, and sometimes mistakenly written as cold-rolled sheet. The cold plate is a hot-rolled steel strip of ordinary carbon structural steel, which is further cold-rolled into a steel plate with a thickness of less than 4mm.

Due to rolling at room temperature, no scale is produced. Therefore, the cold plate has good surface quality and high dimensional accuracy. Coupled with annealing treatment, its mechanical properties and process properties are superior to those of hot-rolled steel sheets. In many fields, especially In the field of home appliance manufacturing, it has gradually replaced hot-rolled sheet steel.

Bangzhou Machinery manufactures and sells cold rolled steel slitting machines. The automatic cold rolling slitting machine is used for longitudinal slitting of steel coils and rewinding of slitted strips into coils. The advantages of this machine are easy operation, high cutting precision, high material utilization rate, and stepless speed. If you need other detailed parameters of the slitting machine, please tell me the specifications of the sheet you need to process, and I will provide you with the data and the technical solution you need.