The Outokumpu Corrosion Handbook Ed. 9th is listing severe pitting and corrosion rates of over 1.0 mm/year for similar concentrations at 20 deg C. Higher temperature increases the rates considerably...The 904L seems to be more resistant, but pitting is still likely at 20 dec C and high corrosion / SCC /pitting at boiling point.
cheers,
gr2vessels