A.M. Castle & Co., a global distributor of specialty metal and plastic products, value-added services and supply-chain solutions, executed a definitive agreement to acquire Houston, Texas-based Tube Supply Inc., a leading value-added distributor of specialty tubular and bar products for the oil and gas industry. Tube Supply provides a broad range of oilfield quality metals with a specific focus on the equipment and tools used in down-hole completion and wellhead applications. The company operates service centers in Houston and Edmonton, Alberta, and recently completed construction of a new, 250,000-square-foot facility located at its Houston headquarters. Tube Supply also provides value-added services including heat treating.