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Product’s and Services |
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CR Processing |
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| Cold rolling is a metalworking process in which metal is deformed by passing it through rollers at a temperature below its recrystallization temperature. Cold rolling increases the yield strength and hardness of a metal by introducing defects into the metal's crystal structure. These defects prevent further slip and can reduce the grain size of the metal, resulting in Hall-Petch hardening. |
| Cold rolling is most often used to decrease the thickness of plate and sheet metal. |
The process of cold rolling |
Cold rolling is a method of cold working a metal. When a metal is cold worked, microscopic defects are nucleated throughout the deformed area. These defects can be either point defects (a vacancy on the crystal lattice) or a line defect (an extra half plane of atoms jammed in a crystal). As defects accumulate through deformation, it becomes increasingly more difficult for slip, or the movement of defects, to occur. This results in a hardening of the metal.
If enough grains split apart, a grain may split into two or more grains in order to minimize the strain energy of the system. When large grains split into smaller grains, the alloy hardens as a result of the Hall-Petch relationship. If cold work is continued, the hardened metal may fracture.
During cold rolling, metal absorbs a great deal of energy. Some of this energy is used to nucleate and move defects (and subsequently deform the metal). The remainder of the energy is released as heat.
While cold rolling increases the hardness and strength of a metal, it also results in a large decrease in ductility. Thus metals strengthened by cold rolling are more sensitive to the presence of cracks and are prone to brittle fracture.
A metal that has been hardened by cold rolling can be softened by annealing. Annealing will relieve stresses, allow grain growth, and restore the original properties of the alloy. Ductility is also restored by annealing. Thus, after annealing, the metal may be further cold rolled without fracturing. |
Where the cold rolled products are used |
| It is often used to form sheet metal. Beverage cans are closed by rolling, and steel food cans are strengthened by rolling ribs into their sides. Rolling mills are commonly used to precisely reduce the thickness of strip and sheet metals. |
Cold Rolled Coil Processing |
| KHOPOLI |
| Process |
Slitting |
Cut to Length |
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Material Specifications |
| Material |
O / D / DD / EDD Grade |
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| Tensile Strength |
28-55 kg / mm² |
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| Thickness |
0.3 – 3.0 |
0.3 – 3.0 |
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Input Coil Specifications |
| Coil Inner Dia(mm) |
508 - 610 |
508 - 610 |
| Coil Outer Dia(mm) |
1900 max |
1900 max |
| Max. Coil Weight (MT) |
30 |
30 |
| Coil Width(mm) |
100 - 2000 |
100 - 2000 |
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Output Coil Specifications |
| Coil Inner Dia(mm) |
508 / 610 |
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| Coil Outer Dia(mm) |
1900 max |
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| Max. Coil Weight (MT) |
20 |
30 |
| Max. Coil Weight (mt) |
10
Slit Width:+/-0.25mm |
10
Length:+/-1mm/ m, diagonal difference 1 mm/m, camber 1 mm/m |
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| CR Standards (Uncoated & Coated) |
Some Important International Standards |
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