... Steel Pipe 4. Material: Carbon Steel: ASTM A106 Gr. B, ASTM A53, Gr. B, ASTM A105, ASTM A234 Line Pipe: API 5L Gr. ... , X56, X60, X65, X70, X80 5. Standard: ASME/ANSI, ASTM, DIN, JIS, BS, EN, GB, API 6. Productive Technology: Hoe ... 9. Applications: Petroleum, chemicals, water conservancy, electric power, boiler, machinery, gas, construction, heating, metallurgy and shipbuilding. 10. Marking: FRD, or as ...