For steel construction and marine structure in particular, the corrosion can be one of the collapse cause, due to excessive reduces of strengths areas and implicit decrease of ultimate moment, accomplished with the fatigue crack and progressive fracture evolution. At present, corrosion rata estimation has an empirical character, therefore the simplified models is use. The variables in frequently used corrosion models have probabilistic character. The means and the standard deviation for plate’s thickness in different corrosion phases of linear and parabolic-linear models are presented in the paper. On the base of linear model are done some results for hogging ultimate bending moment at a bulk-carrier in different stages (ages) of corrosion.
