... , XXS 3. Welding Type: 1) Seamless Steel Pipe, 2) Seamed/Welded Steel Pipe: ERW Steel Pipe, Spiral Steel Pipe 4. Material: Carbon Steel: ASTM A106 Gr. B, ASTM A53, Gr ... . Applications: Petroleum, chemicals, water conservancy, electric power, boiler, machinery, gas, construction, heating, metallurgy and shipbuilding. 10. Marking: FRD, or as requirement ...