... :20MnK, Q275 3.Length: 8, 9,10,12m Name of Products: U-beam of The Mine Channel Steel Specification(KGS/M):25U ... , 29U, 36U Materials:20MnK, Q275 8, 9,10 Or 12 Name ... of Products: U-beam of The Mine usage Channel Steel Specification(KGS/M ...