Nano-pearlite rail and process for manufacturing same

Patent metadata

Field	Value
Publication number	US-10113219-B2
Application number	US-201514665427-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Jun 24, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A nano-pearlite rail and a process for manufacturing the same wherein the rail has excellent mechanical properties, including a tensile strength of no less than 1300 MPa, a yield strength of no less than 1000 MPa, a hardness of HRC 44-47, and an elongation of no less than 10%, as well as excellent wear resistance and fatigue resistance, and is particularly suitable for applications in heavy-haul railways, especially for the railway segments having a sharp turn, and for a wing rail in a bainite steel combined frog.

First claim

What is claimed is:

1. A nano-pearlite rail, which is a steel rail having an internal microstructure of 100% pearlite with an average interlamellar spacing of pearlite of 55-70 nm, and containing 0.83 to 0.93 of C, 0.05 to 0.10 of Mn, a certain content of Al and Si, 1.0 to 1.5 of Cr, 0.1 to 0.3 of Co, 0.35 to 0.55 of Zr, 0.02 to 0.06 of Mg, 0.01 to 0.05 of Cu, less than 0.025 of S, less than 0.025 of P, and reminder of Fe, wherein the content of Al is 8 to 12 times the content of Mn and the collective content of Al and Si is 1, wherein all the amounts are expressed in wt. %.

Assignees

• Univ Yanshan

Inventors

• Zhang Fucheng
• Lv Bo
• Liu Shuo
• Yang Zhinan
• Wang Mingming
• Zheng Yangzeng

Classifications

• C22C38/04

  containing manganese · CPC title

• C21D9/04

  for rails · CPC title

• C21D2201/03

  Amorphous or microcrystalline structure · CPC title

• C21D1/30

  Stress-relieving · CPC title

• C22C38/06

  containing aluminium · CPC title