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Construction method for heat treatment of joints after flash welding of dissimilar rails

A construction method and flash welding technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as non-direct application, achieve good impact toughness of joints, improve saddle "wear", and ensure the safety of railway operation.

Active Publication Date: 2022-03-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the object involved in the present invention is the joint formed by welding the bainite rail and the eutectoid pearlite rail. The difference in material between the bainite rail and the eutectoid pearlite rail makes the above scheme not directly applicable to this patent application

Method used

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  • Construction method for heat treatment of joints after flash welding of dissimilar rails
  • Construction method for heat treatment of joints after flash welding of dissimilar rails
  • Construction method for heat treatment of joints after flash welding of dissimilar rails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Substantic rails of 60 kg / m were completed after the overging and toroma during the mobile flash welding, the joint obtained joint was welded after welding. First, the remaining temperature obtained by welding at 1350 ° C is placed in air naturally cooled to reduce the surface of the rail joint to 200 ° C, followed by an intermediate frequency induction type electric heating coil to carry out the rail welding joint region. Full-section heating. The heating is stopped when the steraltal temperature of the rail reaches 950 ° C. Subsequently, rapid cooling at a cooling rate of 5.0 ° C / s is performed with a cooling rate of 5.0 ° C / s, and the final cooling temperature of this stage is 500 ° C. Next, the third stage cooling is performed at a third cooling rate of 1.0 ° C / s to reduce the surface of the rail joint of the rail joint to 170 ° C. Next, the temperature of the steel welding joint to the surface temperature at 170 ° C was performed using a steel welding joint of ...

Embodiment 2

[0056] Substantial steels with 68kg / m were completed in the mobile flash welding process, and the welded heat treatment was welded afterwards. First, the remaining temperature obtained by welding is placed in air in the air to perform natural cooling in the air to reduce the surface temperature of the steel joint rail to 150 ° C. Then, the steel welded joint region is heated by an intermediate frequency induced electric heating coil. The heating is stopped when the steraltal temperature of the rail reaches 930 ° C. Subsequently, rapid cooling at a cooling rate of 4.0 ° C / s was carried out at a cooling medium of 4.0 ° C / s, and the finishing temperature of this stage was 480 ° C. Next, the third stage cooling is performed at a third cooling rate of 0.8 ° C / s to reduce the surface of the rail joint of the rail joint to 160 ° C. Next, the temperature of the steel welding joint of the surface temperature at 160 ° C at 160 ° C was carried out using a steel welding joint of the s...

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Abstract

The present invention relates to the field of rail rolling production techniques, in particular to a construction method for heat treatment of dissimilar rail joints after flash welding with low cost and good mechanical properties of welded joints after treatment, comprising the following steps: a. The temperature of the welded joint formed by welding rail a and eutectoid pearlitic rail b is 1310-1500 °C for the first stage of cooling; b. After the first cooling, the rail welded joint b is fully normalized; c. After the normalizing heating is completed, the second cooling is carried out immediately; d. After the second stage cooling of the welded joint is completed, the third stage cooling is carried out; e. The tempering heat treatment is carried out. After the tempering process is completed, the surface temperature of the welded joint is reduced to 10 ~ 30 ℃ room temperature. The invention helps to ensure the safety of railway operation, and is especially suitable for the treatment process after welding of dissimilar rails.

Description

Technical field [0001] The present invention relates to the field of rail rolling production process, in particular, a construction method for heat treatment after heterogeneous steel. Background technique [0002] At present, the high-speed, high-speed and passenger cargo mix railway is used in a polygraphic pearlite material, and the amount of carbon containing the carbon of such rails is usually in the range of 0.65 ~ 0.82%, and the gold phase tissue is a pearlite. Good toughness matching, comprehensive mechanical performance indicators. Rapid development of railways puts higher requirements for steel rail service. Since the mechanical properties and welding performance of the traditional pearl steel rail have almost developed, in this case, the strength level is higher, and the bainite steel orbit in good wear resistance and anti-contact fatigue performance is born. Such railroads Carbon content is usually in the range of from 0.10 to 0.30% by weight, and the metallographic t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/50C21D1/28C21D1/42C21D1/52C22C38/02C22C38/04C22C38/22
CPCC21D9/50C21D9/505C21D1/28C21D1/42C21D1/52C22C38/02C22C38/04C22C38/22Y02P10/25
Inventor 白威李大东陆鑫徐飞翔
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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