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The paper presents the experimental results concerning fatigue crackgrowth in the cruciform plate specimens made of 18G2A (S355J0) steel. Two variants ofspecimens were used, one with stress concentrator in form of central hole of 3.0 mm(with the minimum 1.86 mm wall thickness) in diameter and other without a hole (theminimum 1.25 mm wall thickness). The analytic and numerical methods was applied fordescription of fatigue crack growth rate. Simulation of crack growth in cruciformspecimens were performed with the finite element method and the COMSOL software(up to the crack initiation), as well as with the boundary element method and theFRANC3D software (during propagation).