Q: What is cold-rolled coil?
A: Cold-rolled coil is a metal coil produced by rolling hot-rolled coil at room temperature (without heating or with minimal heating) using a cold rolling mill. Common materials include carbon steel, stainless steel, galvanized/tin-plated steel, etc. The thickness is typically 0.1~3.0mm, with a smooth surface and high dimensional accuracy.
Q: What is the core difference between cold-rolled coil and hot-rolled coil?
A: The core difference lies in the rolling temperature and properties:
| Rolling Temperature | Room temperature (below recrystallization temperature) | High temperature (above recrystallization temperature) |
| Surface Quality | Smooth, no oxide scale | With oxide scale, rough surface |
| Dimensional Accuracy | High (small thickness/width tolerance) | Lower |
| Mechanical Properties | High strength, low plasticity (requires annealing) | Good plasticity, moderate strength |
| Common Thickness | 0.1~3.0mm | 1.2~14mm | Q: What are the main grades of cold-rolled coil (carbon steel)? A: Commonly used carbon steel cold-rolled coil grades include: Ordinary grade: SPCC (Japanese Standard), DC01 (European Standard), Q195/Q235 (Chinese Standard); Deep-drawing grade: SPCD (Japanese Standard), DC03/DC04 (European Standard), 08Al (Chinese Standard); Extra-deep-drawing grade: SPCE (Japanese Standard), DC05/DC06 (European Standard).
Q: What are the applicable standards for cold-rolled coils?
A: Different materials/applications correspond to different standards: Carbon steel cold-rolled: GB/T 708 (Chinese Standard), JIS G 3141 (Japanese Standard), EN 10130 (European Standard), ASTM A1008 (American Standard); Stainless steel cold-rolled: GB/T 3280, JIS G 4305, ASTM A240.
Q: What are the standard width and length specifications for cold-rolled coils? A: Common widths are 1000mm, 1219mm, 1250mm, and 1500mm; lengths are mostly in rolls (can be cut to standard lengths as needed, such as 2000mm and 2500mm), and non-standard sizes can also be customized.