The invention provides a manufacturing method for medium chrome ferrite stainless steel. The method consists of the processes of:
smelting,
continuous casting, hot rolling, coiling, acid
pickling, cold rolling, cold coiling annealing and
pickling. In the hot rolling process, subjecting a
hot rolled black coil to hot rolling at a finishing rolling temperature of 860-1000DEG C, and conducting coiling at 750-850DEG C; after coiling, subjecting the hot coil to heat preservation in a heat preservation pit directly, controlling the temperature of the hot coil sent into the heat preservation pit greater than 750DEG C, slowly cooling a steel coil at a
cooling speed of less than 20DEG C / h, taking the steel coil out of the pit when the temperature of the steel coil is lower than 200DEG C, and performing
air cooling to
room temperature; subjecting the
hot rolled black coil to acid
pickling directly on a continuous acid pickling line, and removing the
surface oxide scale; after acid pickling, conducting cold rolling on the steel coil; carrying out recrystallization and
continuous annealing on cold-rolled
strip steel; and performing acid pickling to remove the
surface oxide scale, and at the same time conducting
passivation treatment on the
strip steel. The method provided by the invention omits the process of hot coil bell-type furnace annealing, simplifies the process flow, and strengthens the
cost competitiveness. Compared with single-stand reversible rolling, cold
continuous rolling has the advantages of high production efficiency and low cost.