... /mU71Mn/U71/45MnGB2585-2007 Q/YYG002-200851.514101 Light rail:(type)6kg/m, 8kg/m,12kg/m, 15kg/m,18kg/m ... (quality)U71Mn 50Mn3 Crane light rail:(type)QV70, QV80, QV100, QV120 (quality)U71Mn4 japan/Korea standard(type)37A, 50N, CR73 (quality)U71Mn5 UK ... standard:(type)BS75R BS80A BS13A (quality)U71Mn steel ...