Steel rails' joint fishplate made of xy30 steel

Abstract

The present invention relates to a rail clip, an important fitting part, for the railway made of a new steel XY30 which is one of a high-manganese steel without nickel and which has high strength and high toughness even if it is used in the low-temperature circumstance. The rail clip is characterized in that the rail clip has the shape of a bar with a section of “ T ” and comprises a working surface, a non-working surface, a mounting surface for bolts and a non-working surface inside a web plate; the two working surfaces of a upper small surface side and a lower large surface side on the same side of the rail clip come into circular arc point contact with the railroad rail, a small circular arc is provided on the working surface which is on the upper small surface side; the upper small surface side, the lower large surface side and the non-working surface inside the web plate are connected with circular arcs; upper and lower non-working surfaces on the other side of the rail clip are perpendicular to the horizon.

What is claimed is:  
     
         1 . A rail clip for railroad rails is characterized in that the rail clip is made of the steel XY30, the chemistry composition of the steel XY30 is as following (%): C: 0.28˜0.34, Mn: 1.30˜1.50, Si: 0.15˜0.35, P<0.030, S<0.030, Mo: 0.25˜0.35, V: 0.10˜0.25, Al: 0.015, Nb: 0.05˜0.10, Re: 0.040˜0.20, Cu<0.20; the rail clip has a shape of a bar with a section of “ T ”, the rail clip comprising: a working surface, a non-working surface, a mounting surface for mounting bolts and a non-working surface inside a web plate; the two working surfaces on an upper small surface side and a lower large surface side on the same side of the rail clip come into circular arc point contact with the railroad rail, a small circular arc is provided on the working surface which is on the upper small surface side; the upper small surface, the lower large surface and the non-working surface inside the web plate are connected with circular arcs.  
     
     
         2 . The rail clip for railroad rails as claimed in the  claim 1  is characterized in that the contacting circular arcs of the working surfaces of the upper small surface have a radius of R 2 =19.05 mm and a radius of R 1 ═R9.526 mm, respectively, while the contacting circular arcs of the working surfaces of the lower large surface have a radius of R 6 ═R355.6 mm and a radius of R 5 ═R10.05 mm, respectively, the connecting circular arc connecting the upper small surface with the non-working surface inside the web plate  4  has a radius of R 3 ═R 25.4 mm, the connecting circular arc connecting the lower large surface with the non-working surface inside the web plate  4  have a radius of R 4 ═R14.287 mm; the upper and lower non-working surfaces on the other side of the rail clip are perpendicular to the horizon, the upper non-working surface is projected from the mounting surface for mounting bolts with H 1 =15.875 mm, the lower non-working surface is projected from the mounting surface for mounting bolts with H 2 =22.225 mm.  
     
     
         3 . The rail clip for railroad rails as claimed in the  claim 1  is characterized in that a small circular arc is provided at the center along the length of the working surfaces of the upper small surface, the small circular arc has a width of 54.9 mm along the length of the working surface of the upper small surface, and a radius of R101.6 mm perpendicular to the working surfaces of the upper small surface, a depth of 1.190 mm with respect to the working surfaces of the upper small surface, the small circular arc is extended from the center of the circular arc corresponding to the R 1 , to its point of tangency where the small circular arc is tangental to the circular arc corresponding to the R 3 , via the circular arc corresponding to the R 2 .  
     
     
         4 . The rail clip for railroad rails as claimed in the  claim 1  is characterized in that upper and lower non-working surfaces on the other side of the rail clip are perpendicular to the horizon.