Cold-rolled steel strip manufacturing facility and method for manufacturing cold-rolled steel strip

A method for manufacturing cold-rolled steel strip performing processes in sequence comprising:

• a joining step of, by a joining device, joining a trailing end of a preceding steel strip and a leading end of a following steel strip to form a joined steel strip;
• a storage step of, by a looper, storing the joined steel strip;
• a heating step of, by a heater, heating a joint portion between the preceding steel strip and the following steel strip over an entire width direction;
• and
• a cold rolling step of, by a cold rolling mill, cold rolling the joined steel strip for which the joint portion was heated by the heater, wherein
• the heater is switchable between an output state and a non-output state,
• the heating step switches the heater to the output state, during a period in which the joint portion passes through the heater, and
• the heater is configured to heat the joint portion so that a temperature of the joint portion at an entrance side of the cold rolling mill is 50° C. or higher when a Si content of at least one of the preceding steel strip and the following steel strip is 2 mass % or more.