The surface presents a straight, thin, shallow groove. Parallel to the rolling direction, continuous or intermittent, different density, no regularity, smoother before smoothing, the color of the groove is grayish black, scratched after leveling, burr, metallic bright color.
Pickling, rolling, leveling, finishing parts of the unit in contact with the strip have sharp edges or hard objects, resulting in relative motion;
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Al(%) | Ti(%) |
| Max 0.01 | Max 0.03 | Max 0.03 | 0.02 | 0.02 | — | Max 0.20 |
surface present cold rolled coil has the advantages of high production efficiency and large output, but the investment is large.
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