Abstract: This study summarizes the results of surveys for crane metal structures and bridge crane metal structures with the load capacity from 5+5 tons up to 500/100/20 tons with various operating modes operating at oxygen-converter plants. Based on our own research and on the analysis of the works by other researchers in this field, the researcher of the study established the statistics of the damage of bridge cranes in oxygen-converter plants, depending on their carrying capacity. Characteristic defects and damages are revealed. All the variety of defects and damages is classified into the following main groups: critical, significant and minor. The figures of typical defects and damages are presented.