Railway track welded steel and manufacturing technology thereof

Abstract

The invention discloses a railway track welded steel and a manufacturing technology thereof and mainly comprises the contents of chemical ingredients of the railway track welded steel, matching proportions of raw materials and the manufacturing technology thereof; the railway track welded steel contains the chemical ingredients of: 0.05-0.13 of C; not more than 0.3 of Si; 4-7 of Mn; 16-20 of Cr; 10-13 of Ni; 0.9-2.0 of Mo; not more than 0.02 of P; not more than 0.01 of S; 0.1-0.3 of Ti; not more than 0.15 of Cu; and 57.09-68.95 of Fe. The manufacturing technology of the railway track welded steel comprises the procedures: determining the selection range of chemical ingredients-working out a matching proposal according to the range of chemical ingredients-medium frequency smelting-electroslag remelting (refining)-annealing-discharging-forging-hydrogen diffusion treatment-solid solution treatment-mechanical processing-inspection test; the key manufacturing technology comprises the steps: (1) electroslag remelting (refining), (2) forging, (3) hydrogen diffusion treatment, and (4) solid solution treatment; the railway track welded steel is reasonable in matching chemical ingredients, good in alloying effect, large in the change of forging ratio and excellent in tightness of microstructure, and completely adapts to the occasion of heavy track, heavy load and large variation of temperature difference. The railway track welded steel has high indexes of performance, and the index of welding performance guarantees the quality of welded joints and the traveling safety of trains. Various indexes of performance of the product reach or exceed those of domestic and oversea similar products.

Description

technical field [0001] The invention belongs to the field of metallurgical manufacturing technology. Background technique [0002] Railway track welding steel is used for welding between steel rails and high manganese steel frogs in railway tracks. This is because the materials of steel rails and high manganese steel are quite different. The former is carbon steel, and the latter is high carbon high manganese steel. , and the organizational state of the two is different, the former is in the rolling state, and the latter is in the casting state. Due to these reasons, there is a large difference in welding performance between the rail and the high manganese steel, and it can also be said that the two cannot be welded. However, the development of railway transportation requires high speed and heavy load, and it must be very safe and reliable. If there is a seam bolt between the rail and the high manganese steel, it will inevitably have adverse effects on the speed, load capac...

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Problems solved by technology

[0019]In order to overcome the deficiencies of the existing technology, in view of the railway transportation, especially the high-speed, heavy-load, and safety target requirements of my country's railways, as well as the large temperature difference between the north and the south in my country, and a wide variety of rail types According to the actual situation, the present invention provides a railway track welding steel and its manufacturing process to overcome the unreasonable chemical composition ratio, poor alloying effect, small forging ratio, unreasonable heat treatment system, and poor solid solution effect in the prior art. The performance index of the body is low, which affects the safety of train operation; the welding performance index is not required, which will affect the quality of the weld; it is not suitable for heavy rails, heavy loads, and occasions with large temperature changes.

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