Specification:38kg,43kg,50kg,60kg, 75kg Standard:GB2585-2007 Material:U71Mn,U71V,50Mn ,45Mn Length :12.5m- ... ,U71V,50Mn,45Mn Length :12m,12.5mParamenters: For some non standard heavy rail and fittings, we can design and produce on ... 0086 15998088057SKYPE: ms.helen_xiyida U71Mn / 50Mn common heavy steel rail of GB standard from Helen