River for pitting corrosion resistance and excellent chemical tank of sulfuric acid is corrosive seawater from

摘要

for a chemical tank which can suppress the formula due to corrosion damage due to sulfuric acid and brine to provide a river , by mass %, C: 0.003~0.05%, Si: 5% or less , Mn: not more than 2%, P: less than 0.03%, S: 0.010% or less , 0: 0.0050% or less , Cr: 18~25%, Ni : 10~20%, Mo: 1.0~4.5%, Cu: 1.0~3.0%, N: include from 0.05 to 0.3% , and a remainder of the steel of Fe and inevitable impurities , the display -containing components in mass% and a GI = [Cr] + 1.6 [Ni] + 6.0 [Mo] + 7.1 the value of [Cu] , more than 75 , 88 or less, and , PI = indicating the contained components , in mass % [Cr] + 1.3 [Mo] + 1.4 [Cu] + 2.2 [N] of the value of more than 23 , for excellent chemical tank corrosion and pitting corrosion of sulfuric acid is less than 32 , characterized in that river .