Nucor Corp. said Monday it has entered an agreement with private-equity firm Kohlberg Kravis Roberts & Co. to acquire C.H.I. Overhead Doors in a deal valued at $3.0 billion. C.H.I. makes overhead doors for the residential and commercial markets in the U.S. and Canada. Charlotte, N.C.-based Nucor makes steel and steel products and expects the deal to close in June. "Acquiring C.H.I. allows Nucor to further enhance its already diverse range of businesses that provide end market solutions to the construction and infrastructure markets," Nucor CEO Leon Topalian said in a statement. C.H.I.