consequenthy , martensite stainless steels with higher carbon contents are rather susceptible to underbead cracking , especially when hydrogen is present during welding. because of the internal stresses induced by the volume increase associated with the austenite-to-martensite transformation , underbead cracking can still occur even if relatively low restraint is employed during welding. as a result , martensitic stainless steels with a carbon content above 0.25-0.30% are not normally welded.