(FORTUNE Magazine) - In late January the world's largest steel producer, Mittal Steel of Rotterdam, launched a $23 billion hostile bid for Luxembourg's Arcelor, the world's current No. 2 in steel. The Arcelor board has vowed to fight it. But if the takeover is successful, the combined company will have almost 10% of the global market for steel production. Not since U.S. Steel was at its peak in the early 1950s has there been such a powerhouse in the industry. Here's how the new Mittal would stack up vs. Big Steel in the glory years.

Source: Standard and Poor's COMPUSTAT