Steel Mill MRO - Caster Maintenance: Market Size & Forecast 2026

The global Steel Mill MRO - Caster Maintenance market stands at approximately USD 4.5 billion in 2025 (base year), representing a narrow slice of the broader USD 711 billion global MRO universe but one of the most technically demanding and feedstock-exposed subsectors within industrial maintenance. The category sits in a structurally supplier-favoring posture, driven by the oligopolistic nature of dead-burned magnesia supply, the technical barriers to qualifying replacement refractory grades, and the inelastic nature of caster downtime costs, which typically run USD 50,000 to USD 100,000 per hour for integrated steel mills. Buyer Power Score of -1.8 (supplier-favoring). > **Analyst Take.** The consensus 2.5% CAGR looks soft on the surface, but that is the right number, the category is a mature consumable anchored to steel production volumes, not an emerging technology play. What changes

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