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A kind of manufacturing method of train turnout and steel for train turnout

A manufacturing method and turnout technology, which is applied in the field of iron and steel metallurgy, can solve the problems of reducing the service performance of steel for train turnouts, and achieve the effects of preventing tissue inheritance, ensuring service performance, and fine and uniform grains

Active Publication Date: 2017-05-10
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coarse-grain structure and mixed-grain structure will seriously reduce the performance of steel for railway turnouts after final heat treatment

Method used

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  • A kind of manufacturing method of train turnout and steel for train turnout
  • A kind of manufacturing method of train turnout and steel for train turnout
  • A kind of manufacturing method of train turnout and steel for train turnout

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical composition of the forgings of embodiment 1, embodiment 2 and embodiment 3, and the balance other than this is Fe, and may also contain unavoidable impurities (mass percentage, wt~%) see the following table:

[0030]

[0031] Example 1:

[0032] After forging, the 35CrMoSiMnVTiB steel forgings for railway turnouts are directly sent to the furnace, cooled to 400°C, and kept for 4 hours; then the forgings after heat preservation are heated at 950°C, kept for 8 hours, and then furnace cooled; Furnace cooling to 620°C, heat preservation for 12 hours, then air cooling to the surface temperature of the forgings at 220°C; the air-cooled forgings were reheated to 860°C, and air cooling to room temperature after heat preservation for 4 hours.

[0033] figure 1 Be the original grain state of embodiment 1, figure 2 For the grain state of the core of the forging after the forging is heat-treated according to the above technical scheme, it can be seen that the gra...

Embodiment 2

[0035] After forging, the 35CrMoSiMnVTiB steel forgings for railway turnouts are directly sent to the furnace, cooled in the furnace to 500°C, and kept for 3 hours; then the forgings after heat preservation are heated at 990°C, kept in the furnace for 6 hours, and then cooled in the furnace; Furnace cool to 660°C, keep warm for 10 hours, then air cool to forging surface temperature 210°C; air cooled forgings are reheated to 900°C, keep warm for 2 hours, then air cool to room temperature.

[0036] image 3 Be the original grain state of embodiment 2, Figure 4 For the grain state of the core of the forging after the forging is heat-treated according to the above technical scheme, it can be seen that the grains are obviously uniform and refined after the forging is heat-treated by the present invention.

Embodiment 3

[0038] In the present invention, the 35CrMoSiMnVTiB steel forgings for railway turnouts after forging are directly sent to the furnace for heating, the furnace is cooled to 450°C, and kept warm for 3.5 hours; then the forgings after heat preservation are heated at a heating temperature of 970°C, and the furnace is heated for 7 hours. Cooling; furnace cooling to 640°C, holding for 11 hours and then air cooling to the surface temperature of the forging at 240°C; reheating the air-cooled forging to 880°C, holding for 3 hours and then air cooling to room temperature.

[0039] Figure 5 Be the original grain state of embodiment 3, Figure 6 For the grain state of the core of the forging after the forging is heat-treated according to the above technical scheme, it can be seen that the grains are obviously uniform and refined after the forging is heat-treated by the present invention.

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Abstract

The invention relates to a rail junction and a method for manufacturing steel used for rail junction, which belong to the steel metallurgy field. The method comprises the following steps: forging a 35CrMoSiMnVTiB rail junction by steel, and directly performing hot delivery and charging, cooling a furnace to 400-500 DEG C, insulating for 3-4 hours; heating the insulated forge piece, wherein the heating temperature is 950-990 DEG C, insulating for 6-8 hours and cooling the furnace; cooling the furnace to 620-660 DEG C, insulating for 10-12 hours, cooling in air to the surface temperature of the forge piece to 200-240 DEG C; heating the cooled forge piece to 860-900 DEG C, insulating for 6-8 hours, and cooling in air to room temperature. According to the invention, after the steel forge piece used for the rail junction is forged and then is performed with heat treatment, segregation degree in steel can be obviously improved, crystal grain is fine and uniform, and the usage performance of the rail junction after final heat treatment can be fully ensured.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a train turnout and a method for manufacturing steel for the train turnout. Background technique [0002] The train turnout is an important component of the railway track structure, and it is the special equipment required for the wheels of the rolling stock to transfer from one rail to another. The turnout rail will be subjected to huge wheel impact load when the locomotive passes. At this time, in addition to the greatly increased static load, it will also bear the largest dynamic load on the rail, and the working conditions are extremely harsh. Therefore, in order to ensure the long-term, stable and safe operation of the rails of the train turnout, the steel for the train turnout must have excellent comprehensive properties. [0003] 35CrMoSiMnVTiB train turnout steel not only will appear coarse-grained structure and ordinary mixed-grained structure after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/34C21D8/00
Inventor 陈雨杨其光余霓张先华
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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