1.Specification(KGS/M):25U, 29U, 36U 2.Materials:20MnK, Q275 3.Length: 8, 9,10, ... -beam of The Mine Channel Steel Specification(KGS/M):25U, 29U, 36U Materials:20MnK, Q275 8, 9,10 Or 12 Name ... usage Channel Steel Specification(KGS/M):25U==24.76kgs/M, 29U==29kgs/M, 36U==35.87kgs/M Materials:20MnK, Q275 Length ... keenly wish to cooperate with you for a long time. 29U-beam