4.7　Working Schedule，Annual Working Time and Operating Rate

4.7.1　A continuous working schedule shall be used for the medium slab rolling plant.

4.7.2　The annual effective working time of the medium slab rolling mill shall not be less than 6，500h/a.

4.7.3　The annual effective working time of the steel plate heat treatment line shall not be less than 7，000h/a.

4.7.4　The load factor of the medium slab rolling mill shall not be lower than 85%.