... steel ,forged carbon steel ,alloy Product DescriptionFRD Steel Pipes Steel Pipe Features: 1. Description: API Pipe, API 5L pipe, API 5L, oil pipe, line pipe, steel pipe, steel line pipe ... Treatment: Polishing, Pickling, Antiseptic, Abrasive blasting, HDG, Black painting, Anti-rust ... chemicals, water conservancy, electric power, boiler, machinery, gas, construction, heating, metallurgy and shipbuilding ...