Steel Dynamics runs one of the largest steel production and recycling operations in North America - seven electric arc furnace mills capable of shipping roughly 16 million tons annually. The attack surface is massive: OT networks controlling EAF furnaces, SCADA systems managing metals recycling lines, ERP layers connecting fabrication plants across a national footprint. Founded in 1993 and headquartered in Fort Wayne, Indiana, the company operates a circular manufacturing model where scrap steel becomes prime product, meaning process control systems are as critical to the business as the corporate network.
The downstream side compounds the complexity. Structural steel fabrication, aluminum operations, and a product line spanning hot roll sheet to engineered special-bar-quality steel all run through interconnected production and logistics systems. Industrial control networks, programmable logic controllers, and the data pipelines feeding quality assurance and shipping operations present the kind of hybrid IT/OT environment where a lateral movement in the wrong segment can halt physical production. Defending that means understanding both Purdue Model segmentation and the realities of furnace uptime.
For cybersecurity practitioners, the threat model here is concrete: ransomware targeting operational technology, supply chain integrity in scrap sourcing and metals trading, and the convergence of legacy industrial protocols with modern cloud-connected analytics. The work spans network architecture, endpoint hardening across shop floors, identity management for a large industrial workforce, and incident response scenarios where the blast radius is measured in molten steel, not just data. This is critical infrastructure defense without the abstraction - real systems, real physics, real consequences.
