On-line processing method of pearlite rail
A pearlitic steel rail and processing method technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of reducing the overall service life of the steel rail, affecting the overall performance of the steel rail, affecting the flatness of the steel rail, etc., so as to reduce the contact fatigue damage. The appearance probability of the pearlite, the effect of refining the pearlite lamellar spacing, and reducing the fluctuation of mechanical properties
Active Publication Date: 2021-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
At present, the rolled pearlitic rail is cooled by air cooling, the cooling rate is not uniform, the performance of the rail is poor, and it is easy to generate large residual stress, which affects the straightness of the rail and increases the occurrence of contact fatigue damage probability, affect the overall performance of the rail, and reduce the overall service life of the rail
Method used
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] The pearlitic rail online processing method provided by the present invention comprises the following steps:
[0027] a. The temperature of the rolled pearlitic steel rail is between 840-1000°C. Place the rolled pearlitic steel rail on the elevating steel lifting machine and transfer the pearlitic steel rail through the elevating steel lifting machine;
[0028] b. During the transportation of the pearlitic steel rail, the lifting and steel moving machine exerts force on the pearlitic steel rail, so that when the pearlite steel rail is transported to the entrance of the heat treatment unit, the pearlite steel rail realizes S-shaped bending deformation or round shape on the horizontal plane. arc bending deformation;
[0029] c. The pearlitic steel rail is transported to the entrance of the heat treatment unit;
[0030] d. Put the pearlite rail in...
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Abstract
The invention relates to the technical field of metal heat treatment, in particular to a pearlitic steel rail on-line processing method. The pearlitic steel rail on-line processing method comprises the following steps: a. pearlite steel rails are conveyed by a steel lifting up and shifting machine; b. the steel lifting up and shifting machine exerts a force on the pearlite steel rails in the process of pearlite steel rail conveying, so that the pearlite steel rails achieve S-shaped bending deformation or arc bending deformation on a horizontal plane; c. the pearlite steel rails are conveyed toan entrance of a heat treatment unit; d. the temperature of the pearlite steel rails entering the heat treatment unit is 760-900 DEG C; and e. a cooling device is installed in the heat treatment unit, and the cooling device accelerates the cooling of the pearlite steel rails. By means of the pearlitic steel rail on-line processing method, the strength and toughness of the steel rails are improved, the residual stress of steel rail waists is reduced, the comprehensive performance of the steel rails is improved, the occurrence probability of contact fatigue damage of the pearlite steel rails isreduced, and the overall service life of the steel rails is prolonged.
Description
technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to an on-line treatment method for pearlite rails. Background technique [0002] At present, my country's railways are in a stage of rapid development. High-speed passenger railways, passenger-freight mixed railways, and heavy-duty freight railways are all undergoing rapid and large-scale construction, and the demand for steel rails is increasing. [0003] Pearlitic rails have good mechanical properties and contact fatigue resistance, and have a high service life, and are increasingly used. The production process of pearlitic steel rail is as follows: firstly, smelting by converter, LF refining, then RH vacuum treatment, continuous casting to obtain billet, and finally rolling and heat treatment for billet. At present, the rolled pearlitic rail is cooled by air cooling, the cooling rate is not uniform, the performance of the rail is poor, and it is easy to generate lar...
Claims
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IPC IPC(8): C21D9/04
CPCC21D9/04
Inventor 李若曦韩振宇邹明袁俊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP