Cold annealing and pickling production process for 2D matte surface 439 ferritic stainless steel

The invention discloses 2D matte surface 439 ferritic stainless steel and a cold annealing and pickling production process thereof.The production process comprises the first step of cold rolling base material annealing, specifically, a cold rolling base material obtained after hot line annealing and pickling is subjected to cold rolling, a rolled hard material with the target thickness is obtained, and then the rolled hard material enters a cold annealing and pickling line to be subjected to annealing treatment; 2, neutral salt electrolysis is conducted, specifically, a Na2SO4 solution with the concentration ranging from 180 g/L to 220 g/L is adopted as an electrolyte, the current ranges from 3000 A to 5000 A, and electrolysis is conducted for 0.72 min to 1.67 min at the temperature ranging from 55 DEG C to 65 DEG C; a mixture of nitric acid and hydrofluoric acid is adopted for acid pickling, the concentration of the nitric acid ranges from 90 g/L to 120 g/L, the concentration of the hydrofluoric acid ranges