Abstract
The mechanism of the attack of Type 310 stainless steel by vanadium compounds has been studied. Catastrophic attack by a mixture of 67 wt. percent V 2 O 5 + 33 wt. percent of NaVO 3 occurred at temperatures of 1900 to 2000 F if the steel had previously been oxidized and air and water vapor were present. In some instances an unidentified phase formed at the steel-slag interface attacked the steel by grain boundary penetration and adsorption of steel grains. A chemical analysis of the slag showed that the chromium-iron and manganese-iron ratios were the same in the slag as in the steel. The nickel-iron ratio, however, was higher in the slag than in the steel. This would suggest the possibility that nickel is selectively absorbed by the slag prior to general attack.
4.2.3; 4.3.3, 3.5.9, 6.2.5