McMahon Steel Supply, Inc., established in February of 1995, is a Houston Texas based steel distribution organization. We are a distributor of, and not limited to, the following steel products: API Premium Connector Seamless Coupling Stock 13 Cr Seamless Tubes and Round Bar - 9 Cr Round BarNickel Alloys * Seamless Tubes * Round Bar * Plate * ForgingsHeavy Wall Q & T 4130 & 4140 Seamless Mechanical Tubes 4140 Q & T Round Bar - 4130 NQT Round Bar