Invention Grant
- Patent Title: Method of making high strength steel crane rail
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Application No.: US15334129Application Date: 2016-10-25
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Publication No.: US10604819B2Publication Date: 2020-03-31
- Inventor: Bruce L. Bramfitt , Frederick B. Fletcher , Jason T McCullough , Michael A. Muscarella , John S. Nelson
- Applicant: ARCELORMITTAL INVESTIGACION Y DESARROLLO, S.L.
- Applicant Address: ES Sestao, Bizkaia
- Assignee: ARCELORMITTAL INVESTIGACION Y DESARROLLO, S.L.
- Current Assignee: ARCELORMITTAL INVESTIGACION Y DESARROLLO, S.L.
- Current Assignee Address: ES Sestao, Bizkaia
- Agency: Davidson, Davidson & Kappel, LLC
- Main IPC: C21D9/04
- IPC: C21D9/04 ; C22C38/28 ; C22C38/24 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C22C33/04 ; C21D8/00 ; C21D1/667 ; C21D1/60 ; C21D1/18

Abstract:
A method of making a high strength head-hardened crane rail and the crane rail produced by the method. The method comprises the steps of providing a steel rail having a composition comprising, in weight percent: C 0.79-1.00%; Mn 0.40-1.00; Si 0.30-1.00; Cr 0.20-1.00; V 0.05-0.35; Ti 0.01-0.035; N 0.002 to 0.0150; and the remainder being predominantly iron. The steel rail is cooled from a temperature between about 700 and 800° C. at a cooling rate having an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800° C.), (40 s, 700° C.), and (140 s, 600° C.) and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700° C.), (40 s, 600° C.), and (140 s, 500° C.).
Public/Granted literature
- US20190338386A9 Method of Making High Strength Steel Crane Rail Public/Granted day:2019-11-07
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