Two firms will sell most of their titanium unit.

Allegheny International and NL Industries, partners for the last 30 years in the nation’s largest integrated producer of titanium, plan to sell 90% of their Timet division of Titanium Metals Corp. of America to Kelso & Co. and top managers of the division. Allegheny and NL will each retain 5% of the firm. Terms of the deal were withheld, but Allegheny said it would use proceeds of the sale to reduce debt. The standard-steel division of Titanium Metals is not involved in the sale, Allegheny and NL added.