Product: ERW Pipe Grade: Gr.A, Gr.B, X40-70, Q195, Q235 Standard: API 5L, ASTM A500, ASYM A 53, GB/T 3091, GB/T 6728 O.D.: 21.3-820mm W.T.:1.2-15mm Length: 5.8/6/11.8/12m