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Casting method of low temperature resistant iron cushion plate for high speed railway buckling part

A high-speed railway and iron backing plate technology, applied in the field of casting, can solve problems such as brittle fracture, cracking, and affecting the safety of railway lines

Active Publication Date: 2013-02-20
中原利达铁路轨道技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron backing plate made by the general casting method will crack or even be brittle under low temperature conditions, which will seriously affect the driving safety of the railway line

Method used

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  • Casting method of low temperature resistant iron cushion plate for high speed railway buckling part
  • Casting method of low temperature resistant iron cushion plate for high speed railway buckling part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The casting method of low-temperature-resistant iron backing plates for high-speed railway fasteners includes smelting, spheroidizing inoculation and casting. The raw materials for smelting are pig iron and low-carbon steel with P: ≤0.04%, S: ≤0.03%, and the molten iron after smelting is passed through the ball After melting and inoculation, casting and molding are carried out, and heat treatment is carried out after casting and molding to obtain the required iron backing plate. Mn≤0.3% in hot metal, Si≤2.7%, and the total amount of other alloys≤0.3%. Inoculation includes three inoculations: in-package inoculation, in-mold inoculation and in-flow inoculation; in the selection of nodulizers and inoculants, focus on the following aspects of control: First, strictly control the content of ingredients: main elements such as Mg, Re, Ca, Ba, etc. The deviation range should be less than ±0.3%; the second is mainly Mg, supplemented by Re elements, and at the same time with Ca, ...

Embodiment 2

[0021] In this embodiment, the ferrosilicon inoculant with a particle size of 15 mm is used as the inoculant inoculated in the bag, the barium silicon inoculant with a particle size of 3 mm is used as the inoculant for inoculation in the mold, and the silicon barium inoculant with a particle size of 0.65 mm is used as the inoculant for inoculation with the flow. Strontium inoculant. The molten iron temperature is 1520°C, and the pouring temperature is 1440°C. The heat treatment adopts low-temperature annealing treatment, the heating temperature is 740°C, the holding time is 2.5 hours, and it is cooled to 600°C with the furnace. Others are the same as embodiment 1.

Embodiment 3

[0023] In this embodiment, the ferrosilicon inoculant with a particle size of 20 mm is used as the inoculant inoculated in the bag, the barium silicon inoculant with a particle size of 5 mm is used as the inoculant for inoculation in the mold, and strontium silicon with a particle size of 1 mm is used as the inoculant for inoculation with the flow. Inoculants. The molten iron temperature is 1530°C, and the pouring temperature is 1460°C. The heat treatment adopts low-temperature annealing treatment, the heating temperature is 760°C, the holding time is 3 hours, and it is cooled to 600°C with the furnace. Others are the same as embodiment 1.

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Abstract

The invention discloses a casting method of a low temperature resistant iron cushion plate for a high speed railway buckling part. The method comprises smelting, spheroidizing inoculation and casting, a smelting material is made of cast iron and low-carbon steel which meets requirements that P: <=0.04% and S: <=0.03%, smelted iron water is subjected to nodulizing and inoculation and then is subjected to casting molding, and hot processing is conducted to obtain the required iron cushion plate. According to the casting method, the quantity of ferrites can be increased, the low-temperature toughness is improved, and the anti-impact performance of the iron cushion plate can be improved further.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a casting method of a low-temperature-resistant iron backing plate for high-speed railway fasteners. Background technique [0002] The construction of high-speed railways requires a large number of fastener systems. Among them, the cast iron backing plates necessary for ballastless track fasteners reach nearly 3,300 pieces per kilometer. my country has a vast territory. In many places in the northern region, the winter temperature is low, and the lowest temperature in many places even reaches minus 40. The temperature is extremely low, and some cross-border railways in China connecting Russia, Mongolia, North Korea, etc. are also in low temperature environment all year round. The iron backing plate made by the general casting method will crack or even be brittle under low temperature conditions, which will seriously affect the driving safety of the railway line. Cont...

Claims

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Application Information

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IPC IPC(8): B22D25/00B22D1/00C22C37/00C22C37/10C22C33/08
Inventor 李建宏刘永奎田伟郭志明孟庆洋
Owner 中原利达铁路轨道技术发展有限公司
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