What is cold-rolled steel sheet?
Cold-rolled steel sheet is a steel sheet produced by rolling hot-rolled steel sheet at room temperature using a cold rolling mill. Its thickness is typically between 0.1-3.0 mm, and it has a smooth surface and high dimensional accuracy.
What are the core differences between cold-rolled and hot-rolled steel sheets?
The core differences lie in rolling temperature (cold rolling at room temperature, hot rolling at high temperature), surface quality (cold rolling is smooth and free of oxide scale, hot rolling has oxide scale), dimensional accuracy (cold rolling has higher accuracy), and mechanical properties (cold rolling has higher strength and hardness, but slightly lower toughness).
What are the main materials used in cold-rolled steel sheets?
Common materials include ordinary carbon structural steel (such as SPCC, DC01), high-quality carbon steel (such as 08Al), low-alloy steel (such as Q235 cold-rolled grade), and stainless steel (such as 304, 316 cold-rolled sheets).
What is the purpose of the "annealing" process in cold-rolled steel sheets? Annealing is a crucial process after cold rolling, aiming to eliminate rolling stress, reduce hardness, restore toughness, and improve the processing performance of the steel sheet (such as stamping and bending), resulting in a more uniform microstructure.
What are the applicable standards for cold-rolled steel sheets? Commonly used domestic standards: GB/T 708 (Dimensions, shape, weight and permissible deviations of cold-rolled steel sheets and strips), GB/T 11253 (Cold-rolled thin carbon structural steel sheets and strips); International standards: JIS G 3141 (Japan), EN 10130 (EU), ASTM A1008 (USA).