The main use of titanium as an alloying elements in steels is for carbide stablisation. It combines. With carbon to form titanium carbides,which are quite stable and hard to dissolve in steel, this tends to minimize the occurrence of intergranular corrosion, as with A.I.S.I. 321, When adding approximately 0.25 - 0.60% titanium, the carbon combines with titanium in preference to chromium, Preventing a tie-up of corrosion resisting chromium as inter-granular carbides and the accompanying loss of corrosion resistance at the grain boundaries.
