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It makes steel from iron ore and sells it mostly to builders, carmakers, and appliance makers, and it also mines and sells the iron ore itself.
Companhia Siderúrgica Nacional, usually called CSN, is a Brazilian steel company. It takes iron ore out of the ground, turns much of it into steel at big mills, and sells that steel to the companies that build cars, appliances, and buildings. It is one of the largest steelmakers in Latin America, and it is also a major seller of iron ore to other steel mills around the world.
The business runs on a simple advantage: CSN digs up its own iron ore, the main ingredient in steel, instead of buying it on the open market. That gives it a cushion when ore prices rise. Its steel flows into flat products like coils and sheets, the stuff that gets pressed into car bodies and washing machines, plus long products used in construction. On top of steel and mining, CSN owns a logistics arm that moves cargo by rail and port, and it runs cement and energy businesses too — a set of side bets that use the same heavy industrial skills. Steel is a brutal, cyclical business. Prices swing with construction booms and slumps, and Chinese mills produce so much steel that they set the global price and squeeze everyone else's margins. CSN's answer is vertical integration: own the ore, own the rails, own the ports. That makes it tougher than a pure steelmaker but also ties its fate tightly to Brazil's economy, where it sells a large share of its steel. The company's history is unusually political. It was founded in 1941 as a state-owned project to give Brazil its first big steel mill, and the government sold it to private investors in the early 1990s. Today CSN carries a heavy debt load and has spent years promising to expand its mining capacity to sell more ore abroad. Management has also used cash to pay dividends and buy back shares rather than only paying down debt. When steel and ore prices are strong, that works nicely; when they fall, the debt becomes the story.
Saved answer · last researched 23 Oct 2026
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