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Cold rolled steel plates and strips size, shape, weight and allowable deviation
Cold rolled steel plates and strips refer to hot-rolled coils of various specifications and thicknesses, which are then processed and produced into steel plates and strips of different sizes and various cross-sectional shapes according to certain standards.
Differences between cold rolled steel plates and strips and hot-rolled coils: During the hot rolling process, high temperatures are generated, resulting in higher surface oxidation and higher carbonization levels. Furthermore, due to the increased degree of strain hardening, the yield point of the hot-rolled steel is increased, and the recrystallization and grain growth of the steel are also decreased. During the cold rolling process, the steel is rolled at a temperature below the recrystallization temperature, causing the yield point of the steel to be lowered and the texture improved.
Size and allowable deviation: There are several different dimensions for cold rolled steel: plate, strip, and coil. The size allowed for these three varieties of cold rolled steel will depend on the steel grade, the desired thickness, and the product finished shape. The general allowable deviation for thickness, width, and length can be stated in millimeters or in a percentage of total width or length.
Shape: Cold rolled steel plates have a variety of shapes including circles, squares, rectangles, scalloped shapes, and other unique shapes or profiles. The type of shape chosen will depend on the purpose and desired end use of the product. The allowable deviation for shape is a percentage value of the total size of the rolled shape.
Weight: The weight of a cold rolled steel product can be measured in kilograms or in pounds. The total weight of the product will depend on the steel grade and the finished shape size and thickness. It is important to ensure that the product weight is within the allowable deviation for the finished product.
Allowable deviation: The allowable deviation for cold rolled steel plates and strips is an important factor in determining the safety and performance of the finished product. It is recommended that the allowable deviation for thickness, width, length, shape, and weight should not exceed 3%. If the standard deviation is exceeded, it may result in a decrease in the performance of the product or even a complete malfunction.
In conclusion, the size, shape, weight, and allowable deviation of cold rolled steel plates and strips is important in determining the performance and safety of the finished product. It is important to ensure that these parameters remain within the allowable deviation for the intended product use.
