Invention Grant
- Patent Title: Method for joining steel rails with controlled weld heat input
-
Application No.: US16145835Application Date: 2018-09-28
-
Publication No.: US10851436B2Publication Date: 2020-12-01
- Inventor: Gregory Ryan Lehnhoff , Joseph Victor Kristan , Mark David Richards
- Applicant: CF&I Steel L.P.
- Applicant Address: US CO Pueblo
- Assignee: CF&I STEEL L.P.
- Current Assignee: CF&I STEEL L.P.
- Current Assignee Address: US CO Pueblo
- Agency: Pearne & Gordon LLP
- Main IPC: C21D9/50
- IPC: C21D9/50 ; C21D6/00 ; C22C38/50 ; C22C38/48 ; C22C38/46 ; C22C38/44 ; C22C38/42 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D9/04

Abstract:
A method for creating a welded joint between ends of two steel rails, wherein the two steel rails have a substantially pearlitic microstructure. The method includes a first heating step, an upsetting step, a first cooling step, and a second heating step and provides a means to influence a microstructure and hardness of an austenitic region of a heat affected zone (HAZ) and/or an extent of softening in a softened region of a HAZ.
Public/Granted literature
- US20190100822A1 METHOD FOR JOINING STEEL RAILS WITH CONTROLLED WELD HEAT INPUT Public/Granted day:2019-04-04
Information query