A kind of cold-rolled 430 ferritic stainless steel strip annealing pickling production method
A technology of stainless steel strip and ferrite, applied in the direction of furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of increasing production costs, and achieve the effects of improving efficiency, saving investment, and reducing production costs
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Embodiment 1
[0030] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:
[0031]A1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 550° C., and the excess oxygen concentration is 5.5%. In the second period, The strip temperature at the exit of the annealing furnace is 840°C, the excess oxygen concentration is 7.5%, and the strip annealing time is 20.6s;
[0032] A2. Send the annealed steel strip into the electrolytic pickling section, wherein the concentration of neutral salt solution is 180g / L, and the concentration of nitric acid is 135g / L. The pH value of the electrolytic acid solution is adjusted by adding sulfuric acid, and the pH value is controlled at 3.3. The metal ion concentration is 6g / L, the ...
Embodiment 2
[0035] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:
[0036] B1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 570° C., and the excess oxygen concentration is 6.5%. In the second period, The strip temperature at the exit of the annealing furnace is 860°C, the excess oxygen concentration is 8.5%, and the strip annealing time is 46.5s;
[0037] B2, send the annealed steel strip into the electrolytic pickling section, wherein the neutral salt solution concentration is 200g / L, the nitric acid concentration is 145g / L, and the pH value of the electrolytic acid solution is regulated by adding sulfuric acid, and the pH value is controlled at 3.7, The metal ion concentration is 10g / L, the tem...
Embodiment 3
[0040] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:
[0041] C1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 560° C., and the excess oxygen concentration is 6%; in the second period, The strip steel temperature at the exit of the annealing furnace is 850°C, the excess oxygen concentration is 8%, and the strip steel annealing time is 35s;
[0042] C2, send the annealed steel strip into the electrolytic pickling section, wherein the neutral salt solution concentration is 190g / L, the nitric acid concentration is 140g / L, the pH value of the electrolytic acid solution is regulated by adding sulfuric acid, and the pH value is controlled at 3.5, The metal ion concentration is 8g / L, the te...
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