The Chardon-based Lubricant Oil Additive division of Rhein Chemie Corp. said it plans to expand its network by establishing a North American Technology Center in Pittsburgh next year. Rhein Chemie’s lubricant additives include corrosion inhibitors, sulfur-based extreme pressure agents and additives for greases, hydraulic oils, gear oils and metalworking fluids. They are sold under the Additin brand name.