Raw steel production in the country's Great Lakes region was 673,000 tons in the week that ended Saturday, according to estimates from the American Iron and Steel Institute.
Production was down 30,000 tons from the week prior. Raw steel from Indiana and the Chicago area represents the majority of production in the Great Lakes region.
Production in the Southern District was estimated at 642,000 tons during the period that ended Saturday, up from about 605,000 tons a week earlier.
Domestic mills produced nearly 1.9 million tons of steel last week, up 1 percent from the same period in 2011.
U.S. steel mills operated 75.4 percent of the available production capacity last week, which is up from a 74.7 percent production rate a week earlier.
An estimated 59.5 million tons of steel has been produced so far in 2012 at domestic steel mills, compared to about 56.2 million tons made at the same time last year.