| 摘要 |
There are provided a hot-rolling line, a method for photographing the entire width of a hot-rolled metal strip, a method for recording the photographic result of the entire width, a method for appropriately performing quality assurance, and a method for producing a hot-rolled metal strip using them, which provide proper quality assurance for delivering a product to a customer. In particular, these are characterized by assuredly detecting a localized low-temperature portion, a black spot. A hot-rolling line 100 includes a near-infrared camera 25A, which is capable of photographing the entire width of a rolled material 8, on the entry side of a coiler 24. Shooting is performed by arranging the near-infrared camera 25A, which is capable of photographing the entire width of the rolled material 8, on the entry side of the coiler 24 of the hot-rolling line 100. The quality of the hot-rolled metal strip 8 is determined by the photographic result of the entire width and/or length of the hot-rolled metal strip 8. |
