Reliance Steel & Aluminum Co. announced that it has acquired all the outstanding limited liability company interests of Sunbelt Steel Texas, a value-added distributor of special-alloy steel bar and heavy-wall tubing products to the oil and gas industry. Sunbelt is headquartered in Houston, Texas, and has an additional location in Lafayette, La. Sunbelt will operate as a wholly owned subsidiary of Reliance Steel & Aluminum Co., and current management will remain in place.