co-diffused chromium and silicon corrosion and erosion preventive coatings sold as an integral component of metal tubular products, namely, furnace tubes, heat exchanger tubes, line pipe and downhole tubes for wells and production vessels and piping used in oil and chemical production and power generation and wrought metal products, namely, bars, rods, plates and sheets, panels, waterwell panels and wire screens and metal castings

material treatment services, namely, treating the surface of carbon steel with co-diffused chromium and silicon coating to prevent corrosion and erosion