Method for connection of railway point components consisting of cast hard manganese steel or manganese steel rails to a rail made from carbon steel

• US 5,170,932 A
• Filed: 07/15/1991
• Issued: 12/15/1992
• Est. Priority Date: 07/20/1990
• Status: Expired due to Term

• Current Assignee: VAE Aktiengesellschaft
• Original Assignee: Voest-Alpine Eisenbahnsysteme Gesellschaft M.B.H.
• Inventors: Blumauer, Johannes
• Primary Examiner(s): Seidel, Richard K.
• Assistant Examiner(s): HONG, PATTY
• Application Number:
  US07/731,051
• Time in Patent Office: 519 Days
• Field of Search: 228/189, 228/231, 228/263.13, 228/263.15, 148/127
• US Class Current: 228/189
• CPC Class Codes: B23K 35/004 at least one of the workpieces being of a metal of the iron group
• CPC Class Codes: C21D 9/04 for rails

Abstract

In a method for connection of railway point components (1) such as, for example, frogs consisting of austenitic cast hard manganese steel, or manganese steel rails, to rails (2) made from carbon steel, with the utilization of an intermediate piece (3) made from low-carbon austenitic steel, in which method the intermediate piece (3) is first-of-all welded to the standard rail or connecting rail (2), following which, after cutting off the intermediate piece (3) to a length of less than 25 millimeters, in a second welding operation, the intermediate piece (3) is welded to the component (1) consisting of cast hard manganese steel or to the manganese steel rail (1), an intermediate piece (3) consisting of a low-carbon, austenitic, steel, in particular a chromium-nickel-steel, stabilized with niobium and/or titanium, is utilized and, following the first welding operation, a heat treatment, in particular a diffusion-solution at a temperature between 350° C. and 1000° C., is carried out.

Claims

1. A method for connecting a railway point component, comprising one of a frog formed of austenitic cast hard manganese steel and a manganese steel rail, to a carbon steel rail using an intermediate piece of low-carbon austenitic steel, the method including the steps of:

(a) welding the intermediate piece to the carbon steel rail;

(b) heat treating the weld in a diffusion solution, at a temperature between 350°

C. and 1000°

C. for 2 to 5 hours, and subsequently cooling the weld in still air;

(c) cutting the intermediate piece to a length less than 25 millimeters;

(d) welding the intermediate piece to said component; and

(e) cooling the resulting connection in still air;

wherein the intermediate piece is chromium-nickel steel stabilized with at least one of niobium and titanium.

2. The method according to claim 1, characterised in that the heat treatment is carried on for a period of 3 hours at a temperature of approximately 850°

C.

4. The method according to claim 1, characterised in that any niobium content of the steel for the intermediate piece is at least ten times the carbon content and any titanium content is at least five times the carbon content.

5. The method according to claim 4, characterised in that the steel from which the intermediate piece is made has the additional analytical composition:

space="preserve" listing-type="tabular">______________________________________ C 0.06 max Cr 17.5 Ni 9.5 ______________________________________

with the remainder being substantially iron.

3. The method according to claim 8, characterised in the intermediate piece being of the quality of any one of X10CrNiTi 18 9, X10CrNiTi 18 10, X10CrNiNb 18 9 and X10CrNiNb 18 10.