CZ10058U1 - Connection of a switch portion of manganese steel with a rail of carbon steel - Google Patents

Abstract

Joint of a turnout of manganese steel with a rail of carbon steel, in particular parts of railroad and tram turnouts, is performed by placing on insert of bainitic steel that by frontal welding sparkling is first connected with any part of the manganese steel joint or with any part of the rail carbon steel, and after shortening to 50 mm, the other kind can be welded by frontal welding sparkling to the rail or joint. Bainitic steel used to make the insert, in accordance to the invention, except for the iron, contains the following mass percentages: 0.07 to 0.15% carbon, 0.50 to 1.20% manganese, to the maximum of 0.50% silicon, 1.20 to 2% chromium, 0.40 to 0.70% molybdenum, 2.50 to 3.50% nickel, maximum of 0.13% vanadium, maximum of 0.05% titanium, maximum of 0.045% total content of aluminum in steel, maximum of 0.015% of phosphorus, maximum of 0.015% of sulphur. This connection has more abrasive resistance, has more hardness and removes danger from taking away and wearing of the welding connections and enables also faster speed of crossing over the railroad and tram compositionsover it.

Description

Connection of manganese steel turnout and carbon steel rail

Technical field

The technical solution relates to the connection of a manganese steel turnout to a carbon steel rail, in particular to turnouts of railway and tramway turnouts formed by a bainitic steel spacer.

BACKGROUND OF THE INVENTION

The hitherto known and used connection of turnouts, especially railway and tramway turnouts, to the rails of pearlitic steel are mechanical connections by means of couplings and high-strength screws or in combination with oblique glued insulated joints. The parts so connected are designed to be welded into the track. Due to the different composition of the manganese steel and the necessary heat treatments to achieve the desired properties for the railway and tramway superstructure, it cannot be welded directly to the pearlitic steel. The well-known connection of manganese steel turnout parts is also by means of an austenitic steel insert with a high Cr and Ni content, which allows welding with the rails of pearlitic steel.

The disadvantage of mechanical connection of switches by means of couplings and high-strength screws or in combination with slanted glued joints is tearing of screws and their necessary replacement and due to different thermal expansion of fasteners to break off glued joints, which adversely affects the running of railway and tramway trains. A disadvantage of welding manganese steel turnout parts with rails using austenitic steel insert with a high Cr and Ni content is the difficult weldability of the material, the relatively lower hardness of the Cr Ni spacer causes the rail to pass through the weld.

The essence of the technical solution

These drawbacks are largely eliminated by the connection of the manganese steel turnout part to the carbon steel rail formed by the bainitic steel spacer, which is based on the fact that the bainitic steel spacer has a chemical composition in addition to iron in a weight of 0.07 to 0.15% carbon, 0.50 to 1.20% manganese, maximum 0.50% silicon, 1.20 to 2.00% chromium, 0.40 to 0.70% molybdenum, 2.50% to 3.50% nickel, maximum 0,13% vanadium, maximum 0,05% titanium, maximum 0,045% total aluminum content in steel, maximum 0,015% phosphorus, maximum 0,015% sulfur.

The advantages of a bainitic spacer over the prior art are higher abrasion resistance and higher hardness to prevent weld penetration. A further advantage is to enable rail sets to pass over turnout parts at high speeds without disturbing effects.

Technical examples

An example of a technical embodiment is the interconnection of a manganese steel switch piece according to

UIC 866V with carbon steel rail grade 95 ČSD VK consisting of a bainitic steel spacer, containing in addition to iron 0.14% carbon, 0.80% manganese, 0.34% silicon, 1.76% chromium, 0.471% molybdenum, 2.63% nickel, 0.087% vanadium, 0.045% titanium, 0.042% total aluminum in steel, 0.014% phosphorus, 0.009% sulfur.

Resistance welding is used for joining. In the first weld, the bainitic steel intermediate piece is connected to the manganese steel cross section or the carbon steel connecting rail and after shortening the bainitic intermediate piece to 50 mm, the intermediate piece is connected to the opposite part by a second welding. , ie with a carbon steel connecting rail or with a turnout

Manganese steel part. By melting together the two welded materials, a 35 mm long bainitic steel spacer remains in the joint.

Welding of manganese steel turnout parts with carbon steel rails is advantageously applicable in the production of railway and tramway turnouts with high demands on strength and resistance of welded parts.

Claims (1)

1. Connection of a manganese steel turnout to a carbon steel rail, in particular a turnout for a railway and tramway turnout formed by a bainitic steel spacer, characterized in that the bainitic steel contains, in addition to iron, a weight of 0.07 to 10 0.15% carbon, 0.50 to 1.20% manganese, maximum 0.50% silicon, 1.20 to 2.00% chromium, 0.40 to 0.70% molybdenum, 2.50 to 3.50% nickel, maximum 0.13% vanadium, maximum 0.05% titanium, maximum 0.045% total aluminum content in steel, maximum 0.015% phosphorus, maximum 0.015 % sulfur.