U channel Beam steel 20MnK 1.Spec.: 25U, 29U, 36U 2.Standard:GB/QB 3.Materials: 20MnK, Q275 4.Length: 8,9... U channel Beam steel 20MnK 1.Spec.: 25U, 29U, 36U 2. Standard:GB/QB 3. Materials: 20MnK, Q275 4. Length: 8,9,10,12mwe are the big distributer in china which can supplier good quality and good price ,large quantity U-beam steel. U channel Beam steel 20MnK