The surface of the surface is concave at a certain depth, one side is convex, there are traces of pitch, there are periodicity, some are different, and the color of the defect is brighter.
During the production process, a variety of auxiliary rolls (tension rolls, pinch rolls, pinch rolls, straightening rolls, etc.) are stuck with iron filings, which are caused by dirt;
Iron filings and foreign matter fall into the steel plate.
The hard object cold rolled steel coil is scratched by a hard object during cold rolling, usually in the form of strips, and parallel to the rolling direction. If the degree is serious, the groove can be felt by hand;
The hard object cold rolled steel coil is scratched due to the inclusion of hard objects in the wool felt of the annealing furnace.
There are meteor-like distributions on the surface of the hard object cold rolled steel coil that are sharp, short and deep inside the steel strip. The distribution is uneven and rough, with protrusions.
| Proof strength Rp0.2 (MPa) | Tensile strength Rm (MPa) | Impact energy KV (J) | Elongation at fracture A(%) | Reduction in cross section on fracture Z(%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 882 (≥) | 192 (≥) | 13 | 12 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 121 |
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