终轧温度对含锡铁素体不锈钢组织和耐腐蚀性能的影响

Effect of Final Rolling Temperature on Microstructure and Corrosion Resistance of Sn-Containing Ferritic Stainless Steel

对冶炼的含锡铁素体不锈钢进行热轧(开轧温度为1 150℃,终轧温度分别为730,800,870,940℃)+退火(950℃×5 min)处理,再进行冷轧+退火(900℃×2 min)处理,研究了终轧温度对冷轧退火板显微组织、耐H_(2)SO_(4)和FeCl_(3)腐蚀性能和电化学性能的影响。结果表明:不同终轧温度热轧下,含锡铁素体不锈钢冷轧退火板的显微组织均由γ纤维再结晶织构组成。随着终轧温度的降低,含锡铁素体不锈钢冷轧退火板晶粒尺寸减小,当终轧温度为800℃时,晶粒尺寸为10~20μm,尺寸分布最均匀;耐H_(2)SO_(4)、FeCl_(3)腐蚀和电化学腐蚀速率均随终轧温度的降低呈先减小后增大的趋势,当终轧温度为800℃时达到最小。

The hot rolling(starting rolling temperature of 1 150 ℃, and final rolling temperatures of 730,800,870,940 ℃) and annealing(950 ℃×5 min), and cold rolling and annealing(900 ℃×2 min)treatments were carried out on the smelting Sn-containing ferritic stainless steel. The effects of final rolling temperature on the microstructure of the cold rolled annealed sheet, the corrosion resistance to H_(2)SO_(4) and FeCl_(3) and electrochemical properties were studied. The results show that the microstructures of the cold rolled and annealed sheet at different final rolling temperatures were composed of γ fibre recrystallized grains. With the decrease of the final rolling temperature, the grain size of cold rolled and annealed Sn-containing ferritic stainless steel sheets decreased. When the final rolling temperature was 800 ℃, the grain size was 10-20 μm, and the size distribution was the most uniformly. With the decrease of final rolling temperature the resistance to H_(2)SO_(4), FeCl_(3) corrosion and electrochemical corrosion rate decreased first and then increased, and when the finish rolling temperatures was 800 ℃, both achieving the minimum values.