Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron

A technology of compacted graphite cast iron and railway vehicles, which is applied in the field of alloy compacted graphite cast iron, can solve the problems of enlarged brake discs and harsh working environment of brake discs, and achieve the goals of increasing strength, reducing section sensitivity and increasing yield ratio Effect

Active Publication Date: 2016-04-13
CHANGZHOU LANGRUI CASTING +1
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Problems solved by technology

However, as a large number of 160km / h speed-up trains gradually run, the working environment of the brake disc is even worse, and the tendency of cracks and expansion of the brake disc due to the alternation of heat and cold during work is further increased, which cannot meet the use requirements.

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  • Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron
  • Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron
  • Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron

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[0018] An alloy vermicular graphite cast iron for a railway vehicle brake disc according to the present invention, the chemical composition of the vermicular graphite cast iron includes: C: 3.3-3.5%, Si: 2.3-2.5%, Mn: 0.4- 0.7%, Cu: 0.6~1.0%, Mo: 0.2~0.6%, Ni: 0.6~1.0%, P≤0.07%, S≤0.02%, and the balance of Fe, among them, the vermicular The conversion rate is ≥75%, and the pearlite content is 50% to 60%.

[0019] In the present invention, the C content is designed at 3.3-3.5%. By controlling the carbon content, it can not only increase the amount of worm-like graphite precipitated, but also reduce the tendency of shrinkage and shrinkage porosity. The increase in the amount of graphite resulted in an increase in pearlite reduction and a decrease in the problem. In the present invention, the Si content is designed at 2.3-2.5%, which can increase and reduce the content of pearlite, strengthen ferrite, and have a tendency to increase the amount of graphite, increase tensile stren...

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Abstract

The invention relates to alloy vermicular graphite cast iron for a railway vehicle brake disc and a smelting method of the alloy vermicular graphite cast iron. The vermicular graphite cast iron is composed of, by mass, 3.3%-3.5% of C, 2.3%-2.5% of Si, 0.4%-0.7% of Mn, 0.6%-1.0% of Cu, 0.2%-0.6% of Mo, 0.6%-1.0% of Ni, 0-0.07% of P, 0-0.02% of S and the balance Fe. The vermicular graphite rate of the vermicular graphite cast iron brake disc is higher than or equal to 75% and the pearlite content is 50% to 60%. According to the alloy vermicular graphite cast iron for the railway vehicle brake disc and the smelting method of the alloy vermicular graphite cast iron, the stress threshold value when a disc body is cracked and extended due to thermal stress concentration can be increased, and the mechanical property of the railway vehicle brake disc is improved.

Description

technical field [0001] The invention relates to an alloy vermicular graphite cast iron for a railway vehicle brake disc and a melting method thereof, belonging to the technical field of alloy vermicular graphite cast iron. Background technique [0002] At present, the braking system of railway vehicles is widely adopting the brake disc braking method. In this braking method, more than 90% of the heat is absorbed by the brake disc during the braking process. It will experience rapid heating and strong convective cooling in a short period of time, which will inevitably cause the brake disc to bear high thermal load and thermal stress during the braking process. Therefore, rail vehicle brake disc materials must have good high-temperature mechanical properties, thermal fatigue resistance, stable thermal strength and certain oxidation resistance. [0003] Traditional railway vehicle brake discs are generally made of gray cast iron. Gray cast iron has the characteristics of high ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21C1/08
Inventor 谢达昕封雪平张棣鲍飞张军
Owner CHANGZHOU LANGRUI CASTING
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