Title:
ROLLING CONTACT FATIGUE RESISTANT STEEL RAIL FOR MIXED PASSENGER AND FREIGHT RAILWAY, AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/173803
Kind Code:
A1
Abstract:
The present invention discloses a rolling contact fatigue resistant steel rail for a mixed passenger and freight railway, characterized by comprising the following chemical components by weight percentage: 0.75-0.88% C, 0.10-0.60% Si, 0.75-1.30% Mn, 0.20-0.55% Ni, 0.10-0.20% V, 0.03-0.06% Nb, less than or equal to 0.025% P, less than or equal to 0.025% S, and the remainder being Fe and inevitable impurities. The production process comprises the following steps: molten iron desulfurization, converter smelting, LF refining, vacuum treatment, continuous casting, casting blank heating, rolling, accelerated cooling, and straightening. The present invention, by means of reasonably configuring chemical components and smelting and rolling processes, as well as performing accelerated cooling of a rolled steel rail head, rail web and rail bottom at different cooling rates, achieves good matching of yield ratio of the steel rail head and impact toughness of the rail web, thereby improving the overall service performance and service life of the steel rail, and meeting the requirements of railway development; the method is simple, has strong operability, and is easy to popularize and apply.
Inventors:
FEI JUNJIE (CN)
ZHOU JIANHUA (CN)
LIU FANGMING (CN)
ZHU MIN (CN)
HE WENJI (CN)
OUYANG MINLU (CN)
ZHOU JIANHUA (CN)
LIU FANGMING (CN)
ZHU MIN (CN)
HE WENJI (CN)
OUYANG MINLU (CN)
Application Number:
PCT/CN2022/134335
Publication Date:
September 21, 2023
Filing Date:
November 25, 2022
Export Citation:
Assignee:
WUHAN IRON & STEEL CO LTD (CN)
International Classes:
C22C38/12; B21B1/085; C21C5/28; C21D11/00; E01B5/02
Domestic Patent References:
| WO2021249252A1 | 2021-12-16 |
Foreign References:
| CN111607738A | 2020-09-01 | |||
| CN113646447A | 2021-11-12 | |||
| CN114672730A | 2022-06-28 |
Attorney, Agent or Firm:
HUBEI WUHAN YONGJIA PATENT AGENCY CO., LTD. (CN)
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