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Nickel-free grate material for sintering machine and manufacturing method thereof

A manufacturing method and furnace technology, which are applied to furnaces, electric furnaces, furnace types, etc., can solve the problems of insufficient oxidation resistance and low service life of grate bars, achieve obvious comprehensive economic benefits, improve quality stability, and avoid cracking tendency. Effect

Inactive Publication Date: 2011-05-18
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nickel-free sintering machine grate material that can increase the service life of grate bars and reduce the cost of use, and mainly solve the technical problems of insufficient oxidation resistance and low service life of existing grate bars

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical composition (wt%) of high temperature resistant grate bar material is:

[0018] C Si Mn S P Cr Mo Nb Ti Modifier

[0019] 1.3 1.8 2.1 <0.05 <0.05 16.1 0.42 0.03 0.03 0.08

[0020] The balance is Fe. The scrap steel, casting pig iron and ferroalloy are smelted in an induction furnace in proportion to obtain molten iron whose chemical composition meets the above ratio. The temperature of the furnace is controlled at 1450-1500°C. The modification treatment adopts the punching method, and the modification agent is rare earth magnesium. Insulate at 650-750°C for 4 hours and cool in air.

[0021] After heat treatment, the hardness (HRC) of the material is 40-50, and the limit load of the bending test is ≥600N / mm 2 , deflection ≥ 2mm, organization stabilization, microstructure is distribution of fine and dispersed eutectic carbides on cryptoneedle martensite.

[0022] The results of the high temperature oxidation resistance test are as follows:

[0023] Test ...

Embodiment 2

[0032] The chemical composition (wt%) of high temperature resistant grate bar material is:

[0033] C Si Mn S P Cr Mo Nb Ti Modifier

[0034] 1.9 2.2 1.8 <0.05 <0.05 13.1 0.75 0.03 0.03 0.12

[0035] The balance is Fe. Melt scrap steel, cast pig iron and ferroalloy in a certain proportion with an induction furnace to obtain molten iron whose chemical composition meets the requirements. The furnace temperature is controlled at 1430-1480 °C. Insulate at 650-750°C for 4 hours and cool in air.

[0036] After heat treatment, the hardness (HRC) of the material is 45-52, and the ultimate load of the bending test is ≥650N / mm 2 , deflection ≥ 1.8mm, the structure is stable, the microstructure is the distribution of fine and dispersed eutectic carbides on the cryptoneedle martensite.

[0037] The results of the high temperature oxidation resistance test are as follows:

[0038] Test conditions: The test temperature is 800°C, the weight gain method is adopted, and the weight change ...

Embodiment 3

[0046] Embodiment 3, the chemical composition (wt%) of high temperature resistant grate bar material is:

[0047] C Si Mn S P Cr Mo Nb Ti Modifier

[0048]1.6 2.4 2.5 <0.06 <0.06 19.0 0.6 0.02 0.02 0.17

[0049] The balance is Fe. The scrap steel, cast iron and ferroalloy are smelted in an induction furnace in a certain proportion to obtain molten iron whose chemical composition meets the requirements. It is formulated in a weight ratio of 1:1:1; the heat treatment process is 650-750°C for 4 hours and air cooling.

[0050] After heat treatment, the hardness (HRC) of the material is 46-51, and the ultimate load of the bending test is ≥630N / mm 2 , deflection ≥ 1.9mm, the structure is stable, the microstructure is the distribution of fine and dispersed eutectic carbides on the cryptoneedle martensite.

[0051] The results of the high temperature oxidation resistance test are as follows:

[0052] Test conditions: The test temperature is 800°C, the weight gain method is adopte...

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Abstract

The invention relates to a novel nickel-free grate material for a sintering machine, which mainly solves the technical problems of insufficient oxidation resistance and low service life of the existing grate. The material comprises the following chemical components in percentage by weight: 1.20 to 2.00 percent of C, 1.5 to 2.5 percent of Si, 1.5 to 2.5 percent of Mn, less than 0.06 percent of S, less than 0.06 percent of P, 11 to 20 percent of Cr, 0.3 to 0.8 percent of Mo, 0.02 to 0.03 percent of Nb, 0.02 to 0.03 percent of Ti, 0.05 to 0.2 percent of modificator and the balance of iron. A novel multi-element high-temperature resistant alloy with good high-temperature oxidation resistance and abrasion resistance can be obtained through the design of reasonable components and the multi-element alloying treatment. The service life of the grate material for the sintering machine is greatly prolonged, the using cost is reduced, the labor intensity is reduced, the operability of a sinteringtrolley is improved, and the quality stability of sintered ore is also improved.

Description

technical field [0001] The invention relates to a high-temperature-resistant grate bar material suitable for sintering machines and a manufacturing method thereof, in particular to a nickel-free sintering machine grate bar material and a manufacturing method thereof. Background technique [0002] The grate bar is the main wearing part of the sintering trolley, and its quality and life are directly related to the normal production of the trolley. Since the surface of the grate bar is in direct contact with high temperature (about 1300°C) sintered ore, the working conditions are very harsh, so oxidation burning is the main reason for the early failure of the grate bar. The life spans of the four common material castor strips used in the past are all between 90-180 days. As a result, grate bars are replaced frequently and the number of shutdowns is high, which not only increases the maintenance cost of the sintering machine and the labor intensity of the workers, but also redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C21C5/52C21D1/26
CPCY02P10/20
Inventor 胡恒法裴新华赵楠周丽萍
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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