Abrasion-proof cast iron roll collar for straightening steel rail and preparation method thereof

A wear-resistant cast iron and roll ring technology, which is applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of easy cracks on the roll surface, high deformation resistance, high rail strength, etc., and achieve less processing, high hardness and wear resistance The effect of high reliability and low production cost

Inactive Publication Date: 2009-04-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of cast iron material has low toughness and high brittleness. When it is used for straightening rails, due to the high strength of the rails and high deformation resistance, the roll surface is prone to cracks and even peeling off.

Method used

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  • Abrasion-proof cast iron roll collar for straightening steel rail and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ①Smelting outer layer cast iron: Firstly, ordinary steel scrap, graphite block, ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate are mixed and heated and melted. After the molten iron is melted, ferrovanadium is added, and the composition is adjusted before the furnace. Finally, the temperature was raised to 1540°C, and then it was taken out of the furnace. In the process of taking out the outer layer of molten iron, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 % Al, balance Fe) to inoculate the molten iron with flow, and use the rare earth magnesium alloy to carry out the spheroidization treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and the iron tellurium are broken to a particle size of 6-10mm. block, wrap it with paper and throw it directly into the molten iron ladle, and pour the molten iron after standing still and removing sl...

Embodiment 2

[0043] ①Smelting outer layer cast iron: Firstly, ordinary steel scrap, graphite block, ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate are mixed and heated and melted. After the molten iron is melted, ferrovanadium is added, and the composition is adjusted before the furnace. After that, the temperature was raised to 1522°C, and then it was taken out of the furnace. In the process of taking out the outer layer of molten iron, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 %A1, balance Fe) to inoculate the molten iron with flow, and use the rare earth magnesium alloy to carry out the spheroidization treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and the iron tellurium are broken to a particle size of 6-10mm. block, wrap it with paper and throw it directly into the molten iron ladle, and pour the molten iron after standing still and removing ...

Embodiment 3

[0052]①Smelting outer layer cast iron: Firstly, ordinary steel scrap, graphite block, ferrochromium, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate are mixed and heated and melted. After the molten iron is melted, ferrovanadium is added, and the composition is adjusted before the furnace. Afterwards, the temperature was raised to 1549°C, and then it was taken out of the furnace. In the process of taking out the outer layer of molten iron, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 %A1, balance Fe) to inoculate the molten iron with flow, and use the rare earth magnesium alloy to carry out the spheroidization treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and the iron tellurium are broken to a particle size of 6-10mm. block, wrap it in paper and throw it directly into the molten iron ladle, and pour the molten iron after standing still and removing s...

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Abstract

The invention provides a wear resistant cast iron roll collar used for aligning a steel rail and a preparation method, which belong to the technical field of steel rail processing. The prior wear resistant cast iron roll collar used for aligning the steel rail has the defects of easy occurrence of cracks, complicated manufacture process and the like in quenching process. The method is to compound a wear resistant outer layer with a magnesium iron inner layer into an integral roll collar by centrifuge casting, wherein the wear resistant outer layer comprises the following ingredients in weight percentage: 3.0 to 3.4 percent of C, 1.5 to 2.0 percent of Si, 1.2 to 1.6 percent of Mn, 0.2 to 0.4 percent of Nb, 0.03 to 0.06 percent of RE, 0.03 to 0.06 percent of Mg, 2.5 to 3.0 percent of Ni, 0.4 to 0.6 percent of Mo, 0.8 to 1.2 percent of Cu, 1.5 to 1.8 percent of Cr, 1.0 to 1.4 percent of V, 0.03 to 0.08 percent of B, 0.002 to 0.005 percent of Te, 0.01 to 0.03 percent of Ba, less than or equal to 0.06 percent of P, less than 0.03 percent of S, and the balancing being Fe. The invention has the advantages of high hardness of the roll collar, good wear resistance, simple production process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of rail processing, in particular to a centrifugal casting wear-resistant cast iron roll ring and a preparation method thereof, in particular to a wear-resistant cast iron roll ring for straightening rails and a preparation method thereof. Background technique [0002] The straightness of the rail is an important parameter that determines the service life of the rail and affects the speed of the train. It is one of the important indicators to measure the quality of the rail. It also directly affects the safety and comfort of the train. Advanced rail production plants in various countries attach great importance to rail straightening technology. A variety of straightening methods have been developed for several major flatness defects of rails. In order to meet the needs of high-straightness rails for passenger dedicated lines and high-speed railways with a speed of more than 200 kilometers per hour, my count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/02B21B27/02C22C38/58C22C38/56B22D19/16C21C7/00
CPCY02P10/20
Inventor 符寒光雷永平宋国祥
Owner BEIJING UNIV OF TECH
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