... U71 45Mn 50Mn ISO9001 ASTM AI JIS E 1103/1101 Heavy Rail Name of CommoditySpecificatonMaterialsStandard of ProductsTheory WeightLength of Dimension (m ... /m,18kg/m,22kg/m, 30kg/m (quality)Q235B 55Q2 Heavy rail:(type)38kg/m, 43kg/m, 50kg/m, 60kg/m (quality ... QV120 (quality)U71Mn4 japan/Korea standard(type)37A, 50N, CR73 (quality)U71Mn5 UK standard:(type)BS75R BS80A BS13A (quality)U71Mn steel heavy rails