Domestic steel production totaled 1,812,000 net tons during the week ending Feb. 17, 1990, down 0.1 percent from the previous week, according to the American Iron and Steel Institute. The week's production represented 80.9 percent of the industry's domestic capacity, the steel industry group said Tuesday. American steelmakers produced 2,005,000 net tons in the same week last year, AISI said. Domestic steel production so far this year is 12,191,000 net tons, 9.6 percent below last year's pace, AISI said. Production by district for last week, (previous week in parentheses). North East Coast 236,000 tons (232,000 tons); Pittsburgh-Youngstown 277,000 tons (249,000 tons); Lake Erie 143,000 tons (139,000 tons); Detroit 150,000 tons (151,000 tons); Indiana-Chicago 454,000 tons (493,000 tons); Southern 252,000 tons (245,000 tons); Western 95,000 tons (93,000 tons).