Results of a repair-and-maintenance program aimed at increasing the durability of the converter lining in an oxygen converter shop at the MISW JSC are reported. The program includes a single-round placement of the lining, the use of high-resistance PUPK-1-grade refractory components in high-wear zones, advanced methods for lining maintenance, development of high-resistance mixtures and taphole blocks, improvement of the converter process parameters, and introduction of advanced methods for lining wear monitoring.