High temperature oxidation resistant grid section and preparation method thereof

A technology of high temperature oxidation resistance and grate bar, applied in the field of grate bar, can solve the problems of high use cost, poor oxidation resistance and high price, and achieve the effects of improved deformation resistance, good adhesion and high hardness

Inactive Publication Date: 2010-08-11
北京力拓科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of poor oxidation resistance, peeling, high use cost or high price of the existing steel used in the manufacture of coke oven grates

Method used

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  • High temperature oxidation resistant grid section and preparation method thereof
  • High temperature oxidation resistant grid section and preparation method thereof
  • High temperature oxidation resistant grid section and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The grate of this embodiment is smelted in a 150Kg medium-frequency induction furnace, and the entire smelting process is carried out in a vacuum. The induction furnace smelting can be divided into several stages such as charging, melting, refining, alloying and pouring.

[0026] Specifically, the grate bar of the present embodiment adopts following steps to make:

[0027] 1) melting

[0028] First put 41.198% pig iron by mass percentage and 40% ferrochrome (containing Cr60% and 0.5% C in ferrochrome) into the bottom of the vacuum smelting furnace, and put 0.4% by mass % ferrosilicon (containing Si75% in ferrosilicon) and 5% ferromanganese (containing Mn65% in ferromanganese) in mass percent are put on its upper part, heating, until melting completely.

[0029] 2) Refining

[0030] Then add 0.01% zirconium in mass percentage, 8.0% nickel block and 2.0% chromium nitride, and then add 3% block carbon in mass percentage to deoxidize after melting, add mass % 0.002% boro...

Embodiment 2

[0061] The grate bar of the present embodiment adopts following steps to make:

[0062] 1) melting

[0063] First put the pig iron that the mass percentage is 45%, the ferrochrome that the mass percentage is 37% (Cr60% is contained in the ferrochrome, containing C0.6%) is put into the vacuum smelting furnace bottom, and the mass percentage is 0.7% % ferrosilicon (containing Si75% in ferrosilicon) and 3.75% ferromanganese (the content of each component in ferromanganese contains Mn80%) is put on its upper part and heated until completely melted.

[0064] 2) Refining

[0065] Then add 0.01% zirconium in mass percentage, 6% nickel block and 4% chromium nitride, and then add 3% block carbon in mass percentage to deoxidize after melting, add mass % 0.001% boron, and finally add 0.3% rare earth to refine the grains; before pouring, high-power transmission and stirring are used to further homogenize the temperature and composition of the alloy, and the temperature of the molten ste...

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Abstract

The invention provides a high temperature oxidation resistant grid section, comprising the following components by weight percent: 0.3-0.6% of C, 0.2-0.4% of N, 22-25% of Cr, 0.3-0.5% of Si, 3-4% of Mn, 6-8% of Ni, 0.001-0.002% of B, less than 0.01% of Zr, the balance Fe. The grid section of the invention is prepared by adopting melting, refining, alloying and casting stages. The grid section of the invention has high rigidity and better impact property, distortion resistance capacity at high temperature is improved, and meanwhile corrosion resistance is also improved, and the oxidation film of the grid section of the invention contains no Mn3O4, so that the oxidation film thereof is stable at high temperature and has better compactness and continuity, bonding degree with base material is higher, and the grid section has excellent oxidation resistance and is superior to the existing grid section.

Description

technical field [0001] The invention relates to a grate bar, in particular to a high-temperature oxidation-resistant grate bar and a preparation method thereof. Background technique [0002] Existing sintering locomotive grate bars are easy to be burned, turned around, and burnt, resulting in shedding and material leakage and air leakage. If they are replaced frequently, the sintering production efficiency will be affected. [0003] CN1475593A discloses a grate bar used in a sintering machine trolley and its manufacturing method. Its chemical composition is: C: (0.3%-0.5%); Cr: (12%-15%); Si: (3%-4% ); AL: (0.8%~1.4%); Mn: (0.5%~1.2%); S: ≤0.04%; P: ≤0.04%; the remaining components are Fe and trace impurities. Its manufacturing steps include sand mold making, intermediate frequency furnace smelting, casting molding, and heat treatment. 75.5-78.5%, mold slag is lime 3.2%, fluorite 0.8%, aluminum 1.1-1.4%. The grate bar used in the sintering machine trolley produced by this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21C7/06
Inventor 邓佳刘伟峰张雯翔邓荪
Owner 北京力拓科技有限公司
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