Constellation Enterprises LLC, owner of the nation’s largest single site steel foundry, and nine affiliates filed for bankruptcy on May 16 in Delaware, citing mounting financial troubles stemming from a busted furnace last year that halted production at its main 90-acre facility in Columbus, Ohio.

One of those affiliates, Columbus Steel Castings Co., which manufactures steel castings used in construction and mining equipment, railcars, locomotives and other industrial components, said in court papers that it had found a potential buyer for its operations. Columbus Steel, its parent Constellation Enterprises and the latter’s various subsidiaries collectively owe some $238 million in debt.