... Q235, 45Mn, 50Mn 12kg steel rails Steel Rail1. Light Rail Specification: 12kg/m, 15kg/m, 18kg/m, 22kg ... : U71Mn Standard: GB3426-824. Japan& Korea Standard Rail Specification: 37A, 50N, CR73 Unit Weight:37.2kg ... 9m Material: 55Q Standard: South Africa Standard6. English Standard Rail Specification: 60A, 60R, 70A, 75A, 75R, 80A, ... : GB3426-82 6-30kg railroad light steel rail for farm or mining steel rail