... DescriptionFRD Steel Pipes Steel Pipe Features: 1. Description: API Pipe, API 5L pipe, API 5L, oil pipe, line pipe, steel pipe, steel line pipe, API 5ct 2 ... Corrosion. 9. Applications: Petroleum, chemicals, water conservancy, electric power, boiler, machinery, gas, construction, heating, metallurgy and shipbuilding. 10. Marking: FRD, or ...