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Casting Your Special Products, Exceeding Your Expectations! Matrix Metals LLC is the largest valve casting producer in North America. Matrix Metals LLC has three steel foundries: Keokuk Steel Castings (Iowa), Acerlan Foundry (Mexico), Richmond Foundry (Texas) and Nepco International, our world wide sourcing company. Over 150+ materials poured. Sand, Shell and Investment processes. We offer superior lead-times, competitive pricing and many value-added services. We are the upgrade experts (To Your Specification). Owned by the Sanmar Group, total capacity in North America and India 60,000 tons per annum of steel castings.