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-40 DEG C low-temperature high-strength high-toughness nodular cast iron, preparation method thereof and railway locomotive parts

A technology of nodular cast iron and high toughness balls, applied in the field of railway locomotive parts, to achieve the effects of saving production costs, good inoculation capacity, and avoiding energy and labor input

Active Publication Date: 2019-06-25
CHANGZHOU LANGRUI CASTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patented ductile iron has an unnotched impact value of 25J to 30J at a temperature of -40°C, its elongation is only 3% to 5%.

Method used

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  • -40 DEG C low-temperature high-strength high-toughness nodular cast iron, preparation method thereof and railway locomotive parts
  • -40 DEG C low-temperature high-strength high-toughness nodular cast iron, preparation method thereof and railway locomotive parts
  • -40 DEG C low-temperature high-strength high-toughness nodular cast iron, preparation method thereof and railway locomotive parts

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Embodiment 1）

[0028] The following introduces some of the possible embodiments of the present invention, which are intended to provide a basic understanding of the present invention, but are not intended to identify key or decisive elements of the present invention or limit the scope of protection. It is easy to understand that, according to the technical solution of the present invention, those skilled in the art can propose other alternative implementation modes without changing the essence and spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0029] The application provides the following technical solutions:

[0030] Technical solution 1, a low-temperature high-strength and high-toughness ductile iron at -40°C,...

Embodiment 1

[0053] The preparation method of the nodular cast iron of embodiment 1 may further comprise the steps:

[0054] ① charge preparation: weigh the required amount of pig iron, steel scrap, recarburizer, pure copper, pure nickel, ferrosilicon according to the chemical composition of the nodular cast iron in Example 1, and the addition of the furnace charge is 0% to 50%.

[0055] The pig iron is Q10 pig iron, wherein Mn≤0.06%, P≤0.02%, S≤0.15%, Ti≤0.02%.

[0056] Said steel scrap is pipe trimming scrap, wherein C≤0.2%, Si≤0.2%, Mn≤0.6%, P≤0.15%, S≤0.1%.

[0057] The recarburizer is a crystalline recarburizer calcined and graphitized at a high temperature.

[0058] ②Smelting: first add the steel scrap and recarburizer weighed in step ① into the intermediate frequency furnace, then add pig iron and pure nickel plate, and after all the furnace materials are melted, sprinkle the slag removal agent for molten iron slag removal; when the smelting temperature reaches 1530-1560 Stand sti...

Embodiment 2

[0082] The matrix structure diagram (95%P+5%F) in the metallographic structure of the 100 times metallographic structure of the nodular cast iron in Example 2 after corrosion is shown in figure 2 .

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Abstract

The invention discloses -40 DEG C low-temperature high-strength high-toughness nodular cast iron, a preparation method thereof and railway locomotive parts. The nodular cast iron comprises the following components, by weight, of 3.6% to 3.9% of C, 1.9% to 2.1% of Si, smaller than 0.2% of Mn, smaller than 0.3% of P, 0.003% to 0.012% of S, 0.35% to 0.5% of Cu, 1.1% to 1.5% of Ni, smaller than or equal to 0.03% of Fe, 0.025% to 0.05% of Mg and the balances Fe and inevitable impurities. The constitution of the nodular cast iron disclosed by the invention realizes organic integration of high strength, high toughness and low temperature impact toughness of the nodular cast iron, so the nodular cast iron can meet higher use requirements and has technological perspectiveness. The nodular cast irondisclosed by the invention meets the material requirements of key parts applied to rail traffic.

Description

technical field [0001] The invention relates to a nodular cast iron, in particular to a -40°C low-temperature high-strength and high-toughness nodular cast iron and a preparation method thereof, as well as railway locomotive parts mainly prepared by using the nodular cast iron. Background technique [0002] In recent years, with the rapid development of my country's rail transit industry, electric locomotives operate in an increasingly vast area with a large latitude span; the winter temperature in the alpine areas they travel to is as low as -40°C. Based on the running speed and safety considerations of locomotives, the requirements for low temperature impact toughness of castings such as ductile iron gearboxes for electric locomotives are also getting higher and higher. China Railway Corporation's TJ / JW 065-2015 "Interim Technical Conditions for AC Transmission Locomotive Ductile Iron Gearbox" stipulates that the ductile iron gearbox not only requires the mechanical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/06C22C33/10
CPCC22C33/06C22C33/10C22C37/04C22C37/10
Inventor 喻光远陈琳徐小辉朱正锋
Owner CHANGZHOU LANGRUI CASTING
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