Wuhan SiWeiZhongcheng Technology Co.. Ltd
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Cold-rolled thin steel sheet, abbreviated as cold-rolled sheet and commonly known as cold plate, refers to cold-rolled sheets made of plain carbon structural steel.
Cold rolling primarily uses low-carbon steel grades and uses hot-rolled steel as the raw material. It undergoes a series of processes including pickling to remove scale, cold rolling, annealing, coating/plating, and finishing to form the final product. Compared to hot-rolled sheets, cold-rolled sheets have better surface quality, higher dimensional accuracy, and—due to the annealing treatment—excellent mechanical properties. These include higher strength, lower yield limit, good elongation, and deep-drawing formability. Both the mechanical and processing properties of cold-rolled sheets are superior to those of hot-rolled thin steel sheets. In many fields, especially home appliance manufacturing, cold-rolled sheets are gradually replacing hot-rolled thin steel sheets.
Cold-rolled sheets have a wide range of applications, such as in automobile manufacturing, electrical products, railway vehicles, aviation, precision instruments, and food cans.
Cold-rolled products include: cold-rolled sheets, coated/plated sheets, and silicon steel sheets.
Annealing of cold-rolled sheets is mainly performed using two methods: batch annealing and continuous annealing.
Batch Annealing:
Several steel coils are placed together inside a bell-type furnace, where they simultaneously undergo heating, soaking, and cooling heat treatment. Leveling and other treatments are performed outside the furnace.
Advantages: High flexibility in adapting to changes in product specifications and output.
Disadvantages: Long production cycle, low efficiency, limited product variety, relatively poor surface quality, and inferior consistency (uniformity) of properties within the same coil.
Continuous Annealing:
The steel coil is uncoiled, welded, and then continuously passed through processes including cleaning, heating, cooling, leveling, and oiling.
Advantages: Short production cycle, high efficiency, wide product variety, good surface quality, and excellent consistency (uniformity) of properties within the same coil.
Disadvantages: Low flexibility in adapting to changes in product specifications and output.
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