Continuous annealing line, continuous hot-dip galvanizing line, and method of producing steel sheet

A method of producing a steel sheet, the method comprising, in the following order:

• a process (A) of uncoiling a cold-rolled coil to feed a cold-rolled steel sheet by a payoff reel;
• a process (B) of passing the cold-rolled steel sheet through an annealing furnace wherein a heating zone, a soaking zone, and a cooling zone are disposed in this order from upstream in a sheet passing direction, to continuously anneal the cold-rolled steel sheet by a process (B-1) of annealing the cold-rolled steel sheet in a reducing atmosphere containing hydrogen in the heating zone and in the soaking zone, and a process (B-2) of cooling the cold-rolled steel sheet in the cooling zone;
• process (C) of continuously passing the cold-rolled steel sheet discharged from the annealing furnace;
• and
• a process (D) of coiling the cold-rolled steel sheet by a tension reel to obtain a product coil,
• wherein the method further comprises, in a period from the process (B-2) and prior to the process (D), a magnetic field applying process of applying a steady magnetic field along the sheet transverse direction of the cold-rolled steel sheet to the cold-rolled steel sheet being passed.