... surface quality,the products are mainly used in railway, tunnel, crane,etc. Main standards: Q/YY001-2008,Q/YYG002-2008, GB2585 ... ,U71,U75V,U75VM,PG4 Length:12m,12.5m,25m,etc3.Crane rail size: QU70, QU80, QU100, QV120 material: U71Mn Length:12m ...