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Grate bar and preparation method thereof

A manufacturing method and grate technology, applied in furnaces, electric furnaces, furnace types, etc., can solve problems such as poor casting performance and poor oxidation resistance, and achieve the effects of reducing energy consumption, good casting forming performance, and good appearance quality

Inactive Publication Date: 2011-01-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This material has the disadvantages of poor oxidation resistance at the lower limit of chromium and aluminum content, and poor casting performance at the lower limit of carbon content or upper limit of chromium content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The grates are smelted in a 500kg medium-frequency induction furnace, and the specific process steps are as follows:

[0025] (1) Mix and heat scrap steel and ferrochromium, add ferrosilicon and aluminum successively after molten steel is melted, add ferroniobium and ferrotitanium before it is released from the furnace, and release it when the temperature of molten steel reaches 1579°C.

[0026] (2) Put the cerium rare earth element and magnesium into the ladle in advance, and carry out the rare earth and magnesium composite treatment by the ladle flushing method, wherein the cerium rare earth element is added in the form of rare earth ferrosilicon alloy, and the magnesium is added in the form of passivation granular magnesium, wherein the passivation The passivation layer of the granular magnesium is composed of the following raw materials proportioned by mass percentage, sodium chloride: 30-40%, potassium chloride: 25-35%, magnesium chloride: 20-30% and barium chloride...

Embodiment 2

[0032] The grates are smelted in a 750 kg medium frequency induction furnace, and the specific process steps are as follows:

[0033] (1) Mix steel scrap and ferrochromium and heat to melt. After the molten steel is melted, ferrosilicon and aluminum are added successively, and ferroniobium and ferrotitanium are added before being released from the furnace. The molten steel is released when the temperature reaches 1553°C.

[0034] (2) Put the cerium rare earth and magnesium into the ladle in advance, and carry out the rare earth and magnesium composite treatment by the ladle flushing method, wherein the cerium rare earth is added in the form of rare earth ferrosilicon alloy, and the magnesium is added in the form of passivation particle magnesium, wherein the passivation particle The passivation layer of magnesium is composed of the following raw materials proportioned by mass percentage, sodium chloride: 30-40%, potassium chloride: 25-35%, magnesium chloride: 20-30% and barium ...

Embodiment 3

[0039] The grates are smelted in a 750 kg medium frequency induction furnace, and the specific process steps are as follows:

[0040] (1) Mix steel scrap and ferrochromium and heat to melt. After the molten steel is melted, ferrosilicon and aluminum are added successively, and ferroniobium and ferrotitanium are added before being released from the furnace. The molten steel is released when the temperature reaches 1567°C.

[0041] (2) Put lanthanum, cerium rare earth and magnesium into the steel ladle in advance, and carry out rare earth and magnesium compound treatment with the ladle flushing method, wherein lanthanum and cerium rare earth are added in the form of rare earth ferrosilicon alloy, and magnesium is added in the form of passivated granular magnesium, Wherein the passivation layer of the passivation granular magnesium is composed of the following raw materials proportioned by mass percentage, sodium chloride: 30-40%, potassium chloride: 25-35%, magnesium chloride: 20...

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Abstract

The invention discloses a grate bar and a preparation method thereof, which belongs to the technical field of heat-resisting materials. The grate bar comprises the following chemical components in percentage by mass: 1.2 to 1.6 percent of C, 15.0 to 20.0 percent of Cr, 2.3 to 2.8 percent of Al, 4.5 to 5.0 percent of Si, 0.05 to 0.15 percent of Ti, 0.05 to 0.15 percent of Nb, 0.08 to 0.20 percent of RE, 0.06 to 0.15 percent of Mg, less than 0.6 percent of Mn, less than 0.04 percent of S, less than 0.05 percent of P and the balance of Fe, wherein the total mass of the Ti and the Nb is more than or equal to 0.20 percent and less than or equal to 0.28 percent. The grate bar of the invention can be produced by electric furnace and is formed by lost foam casting; the grate bar has high strength, high toughness, high inoxidizability and high thermal fatigue resistance, and can be used on large sintering machine trolley for more than 2 years; and when the grate bar is used, the labor intensity of workers can be relieved, the production efficiency of the sintering machine can be improved, and great social and economic benefit can be created.

Description

technical field [0001] The invention relates to a furnace grate and a preparation method thereof, in particular to a sintering machine trolley grate for sintering iron ore powder and a preparation method thereof, belonging to the technical field of heat-resistant materials. Background technique [0002] The grate is a heat-resistant and consumable item on the trolley of the iron ore powder sintering machine, and its function is similar to that of a coal-fired boiler grate. The function of the grate is to form a groove-shaped space with the sintering machine trolley fence to accommodate the sintered ore. During the sintering process, the grate circulates with the trolley at a certain speed. When the trolley starts to receive the cloth at the head of the sintering machine, the temperature of the grate is the lowest. When starting up for the first time, the temperature of the grate is room temperature, and when it is turned to the ignition position, it generally reaches 200°C....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34C21C5/52C21C7/00
CPCY02P10/20
Inventor 符寒光刘生龙张旺盛雷永平
Owner BEIJING UNIV OF TECH
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