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Construction method for bainite steel rail postwelding connector heat treatment

A construction method and bainite technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem that the effect of heat treatment needs to be discussed, and achieve the effect of eliminating negative factors and avoiding wear and tear.

Inactive Publication Date: 2019-07-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the joint is air-cooled directly after the bainitic rail is welded, and there is no heating process after the rail is welded, and the effect of heat treatment is open to question

Method used

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  • Construction method for bainite steel rail postwelding connector heat treatment
  • Construction method for bainite steel rail postwelding connector heat treatment
  • Construction method for bainite steel rail postwelding connector heat treatment

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Experimental program
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Effect test

Embodiment

[0039] Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0040] In the present invention, the "welded joint" is an area obtained after welding, including the weld seam and / or normalizing heat-affected zone, with a length in the range of 80-120 mm, and the center of this area is the rail weld seam. In the present invention, the "room temperature" is a temperature in the range of 10-35°C.

[0041] The object of the present invention is to provide a post-weld heat treatment method for bainite rails, which method includes: first cooling the welded joints of bainite rails obtained by welding at a temperature of 1300-1500°C to 150-300°C, and then The welded joint obtained under the first cooling condition is heated to 880-950°C with a medium-frequency induction profil...

Embodiment 1

[0057] Air-cool the welded joints of bainite rails obtained by flash welding at a temperature of 1500°C. When the welded joints are cooled from 1500°C to 250°C, use medium-frequency induction imitation electric heating coils to heat the entire section of the welded joints of the rails . Stop heating when the tread temperature of the rail reaches 900°C, then immediately air-cool the obtained rail welded joint to 220°C, and finally air-cool the welded joint to room temperature (about 23°C), thereby obtaining the post-weld heat-treated Bainitic rail welded joints.

[0058] The bainite rail welded joint obtained in this embodiment is machined into a longitudinal hardness sample, and the longitudinal Rockwell hardness test is carried out on the welded joint at a position 5 mm below the tread, and the measuring points are arranged symmetrically to the left and right sides with the weld seam as the center. The measuring point spacing is 5mm. The Rockwell hardness test method is car...

Embodiment 2

[0063] Air-cool the welded joints of bainitic rails at 1400°C obtained by gas pressure welding. When the welded joints are cooled from 1400°C to 200°C, use an oxygen-acetylene flame profiling heater to conduct full-section inspection of the welded joints of the rails. heating. Stop heating when the tread temperature of the rail reaches 940°C, then use a water mist mixture to cool the welded joint of the rail to 250°C, and finally air-cool the welded joint to room temperature (about 23°C), thereby obtaining the post-weld heat treatment of the present invention welded joints of bainitic rails.

[0064] The bainite rail welded joint obtained in this embodiment is machined into a longitudinal hardness sample, and the longitudinal Rockwell hardness test is carried out on the welded joint at a position 5 mm below the tread, and the measuring points are arranged symmetrically to the left and right sides with the weld seam as the center. The measuring point spacing is 5mm. The Rockw...

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Abstract

The invention discloses a construction method, particularly discloses a construction method for bainite steel rail postwelding connector heat treatment, and belongs to the technical field of the steelrail rolling production technology. The construction method for bainite steel rail postwelding connector heat treatment is provided, accordingly, the tread hardness of a bainite steel rail welding connector can be controlled within the reasonable range. According to the construction method, the bainite welding steel rail welding connector with the temperature kept at 1,300 DEG C-1,500 DEG C serves as the base, the bainite welding steel rail welding connector is obtained through welding, the bainite steel rail postwelding connector heat treatment work is finished through one-time normalizing heating and three-time cooling, wherein one-time normalizing heating is full-fracture-surface heating behind first-time cooling, and the initial cooling temperature of third-time cooling is 200-350 DEGC.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for heat treatment of welded joints of bainite rails, and belongs to the technical field of rail rolling production technology. Background technique [0002] Bainitic steel rail has been a research hotspot in the world in recent decades. It is expected to replace traditional pearlitic steel rail due to its high strength, toughness, wear resistance and long service life. Radius curve segment. At this stage, rail seamlessness has become an inevitable trend. As an important process in the seamless link of rails, the quality of rail welding is directly related to the service life of railway lines and even the safety of traffic. During the service process of rails, due to the influence of welding quality and the complexity of the actual operating conditions of the line, most of the fractures of welded long rails occur on the welded joints, so the welded joints have beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/28C21D1/42C21D1/52
CPCC21D1/28C21D1/42C21D1/52C21D9/50C21D2211/002Y02P10/25
Inventor 白威李大东邓健陆鑫
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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