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US 2009/0242519 A1Published application
Welding of an element of a track unit and a rail section without adding any material
OwnerSerge Baumert, Philippe Mugginventors
Life of this patent
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Abstract
The stretch of rail comprises a railway switch element (12) made from high-alloy steel, in which at least one alloy element has a content equal to at least 5% by weight, and a length of rail (14) made from steel, connected to one another by a weld without deposition of metal. The length of rail (14) is formed from a medium-alloy low-carbon steel of which the carbon content is less than 0.55% by weight.
Claims10
A process for the manufacture of a stretch of rail, comprising:
- directly welding a railway switch element to at least one length of rail by flash welding and forging to produce said stretch of rail, wherein:
- said railway switch element is made from high-alloy steel, in which at least one alloy element has a content equal to at least 5% by weight, and said at least one length of rail is made from a medium-alloy steel having a carbon content less than 0.55% by weight and which is a bainitic steel.
The process of 5, wherein the medium-alloy low-carbon steel forming said at least one length of rail has the following composition by weight:
- 0.28% to 0.36% of carbon;
- 1.40% to 1.70% of manganese;
- at most 0.03% of phosphorus;
- 0.01% to 0.03% of sulphur;
- at most 0.005% of aluminium;
- 1% to 1.40% of silicon;
- 0.40% to 0.60% of chromium;
- 0.08% to 0.20% of molybdenum;
- at most 0.04% of titanium;
- and
- at most 0.004% of boron.
8 more elements
Dependencies are inferred from the claim text.