Process of controlling lower-limit Mn content of R350HT steel rail flash welded joint structure

A technology for R350HT and welded joints, which is applied in the microstructure field of R350HT rail flash welded joints with the lower limit of Mn content, can solve the problems of increasing the content of martensite in the joints, and achieve the effect of simple control process and good promotion and application prospects
CN110480143AActive Publication Date: 2019-11-22PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Publication Date
2019-11-22

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention belongs to the technical field of steel rail flash welding and discloses a process of controlling the lower-limit Mn content of an R350HT steel rail flash welded joint structure in orderto solve the technical problem that an R350HT steel rail flash welded joint is likely to have the martensitic structure in the prior art. The process of controlling the lower-limit Mn content of theR350HT steel rail flash welded joint structure, provided by the invention, comprises the steps of welding and postweld treatment, wherein in the welding process, pulsation or preheating flash weldingis conducted by controlling the welding heat input to be 3.5-4.5 MJ, and the welding upset forging amount is 10.0-11.5 mm; and in the postweld treatment process, the joint is naturally cooled to the indoor temperature in the air. According to the process, no abnormal structures such as the martensitic structure existing in the steel rail flash welding joint are ensured through comprehensive control over chemical components of a steel rail, the hot rolling process, the welding process and postweld cooling, and meanwhile, the mechanical performance of the joint is ensured.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of rail flash welding, and in particular relates to a process for controlling the microstructure of R350HT rail flash welding joints with a lower limit of Mn content. Background technique

[0002] With the rapid development of seamless track technology in passenger transport, freight transport, high-speed and heavy-duty railway construction worldwide, the quality of rail joints has attracted more and more attention from relevant departments. As the direct carrier of train operation, the quality and reliability of railway lines is the key to the safe operation of trains. Rail flash welding joints are the weak link of the whole line, and their quality can directly affect the safety of the railway. In the matrix of rail flash welded joints, the martensite structure belongs to the hard and brittle phase, which has high hardness and extremely low toughness. Cause rails to break on the line, drop blocks or even ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More