Method of making a tee rail having a high strength base
A controlled cooling process for carbon steel tee rails with specific composition and cooling rates enhances base hardness, addressing the need for higher strength and fatigue resistance in steel rails, achieving an average Brinell hardness of 350 HB and beyond.
US20260185180A1Pending Publication Date: 2026-07-02ARCELORMITTAL SA
Patent Information
- Authority / Receiving Office
- US · United States
- Patent Type
- Applications(United States)
- Current Assignee / Owner
- ARCELORMITTAL SA
- Filing Date
- 2026-01-26
- Publication Date
- 2026-07-02
Smart Images
Figure US20260185180A1-D00000_ABST
Abstract
A method of making a high strength base-hardened tee rail and the tee rail produced by the method. The method includes the steps of providing a carbon steel tee rail, the steel tee rail provided at a temperature between 70° and 800° C.; and cooling the steel tee rail at a cooling rate that the temperature in ° C. of the surface of the base of the steel tee rail, is maintained in a region between: an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800° C.), (80 s, 675° C.), (110 s, 650° C.) and (140 s, 635° C.); and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700° C.), (80 s, 575° C.), (110 s, 550° C.) and (140 s, 535° C.).
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