The heating temperature of the slab is too high, and the time is too long; the furnace has a strong oxidizing atmosphere, and the furnace is pressed while the iron oxide scale is rolled;
The high pressure cold rolled steel coil water pressure is insufficient, and the scale is not cleaned before rolling;
The high pressure water nozzle is blocked, and the local scale is not removed;
Sets of scales open the number of groups high pressure cold rolled steel coil is not enough, descaling is not clean.
Chemical composition % of the ladle analysis of grade SC2
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Al(%) | Ti(%) |
| Max 0.01 | Max 0.03 | Max 0.03 | 0.02 | 0.02 | — | Max 0.20 |
The upper and lower surfaces of the strip have strip-like, black-gray streaks and dullness.
The temperature and cooling rate of each part of the hot-rolled strip are different, that is, the temperature and cooling rate of the head, the middle and the tail along the length direction of the strip and the edge and the middle of the width are different, so that the iron structure of each part of the same strip is made. Different from the thickness, in general, the head and the middle of the hot-rolled strip are 30-50 °C higher than the tail temperature. Therefore, the head iron is thicker and the tail iron is thinner. Therefore, high pressure cold rolled steel coil is easy to produce at the same pickling speed. Partially not washed;
The pickling process is not suitable, such as the concentration of pickling, the temperature is low, the pickling speed is too fast, the pickling time is insufficient, or the ferrous iron concentration is too high, and the acid solution is not added in time;
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