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High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof

A high-temperature wear-resistant and incinerator technology, applied in the field of wear-resistant materials, can solve the problems of high tendency of brittle cracking, high replacement frequency of grate, poor toughness and plasticity, etc.

Active Publication Date: 2016-06-08
SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, the current problems of the grate are mainly: under the condition of high hardness and high strength, the toughness and plasticity are poor, the material is brittle and the latter has a greater tendency to brittle cracking; the mechanical reciprocating motion of the incineration grate, its high temperature wear and high temperature Corrosion and oxidation in complex environments are the main failure modes; the frequency of grate replacement is high, and the composition design of high chromium, high nickel and high molybdenum alloy elements in the material makes the relative cost of the product relatively high

Method used

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  • High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof
  • High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof
  • High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof

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Effect test

Embodiment 1

[0050] Embodiment 1: the high-strength, toughness, high-temperature wear-resistant and corrosion-resistant cast steel for incinerator grate of the present invention, the weight percentage of its chemical composition is: C: 0.18%; Si: 0.8%; Mn: 0.5%; Cr: 15 %; P≤0.015%, S≤0.01%; Al: 1.5%; rare earth RE: 0.005%; Nb: 0.25 and Ti: 0.15, the rest is Fe, and other unavoidable impurities;

[0051] Dosing according to the above ingredients: put steel scrap, carbon ferrochrome, low-carbon ferrochrome or iron filings, pig iron, ferrochrome, titanium or ferro-titanium, niobium or ferro-niobium into the furnace after batching according to the chemical ratio, induction furnace or Vacuum induction furnace melting, pouring temperature 1540 ℃ ~ 1550 ℃, pouring 3 hours after unpacking and air cooling. Subsequent heat treatment process can be carried out as follows: homogenization annealing at 1200°C for 1 hour, furnace cooling to 850°C, heat preservation for 4 hours, and air cooling to room te...

Embodiment 2

[0052] Embodiment 2: the high-strength, toughness, high-temperature wear-resistant and corrosion-resistant cast steel for incinerator grate of the present invention has the weight percentage of its chemical composition: C: 0.42%; Si: 2.0%; Mn: 1.2%; Cr: 25 %; P≤0.015%, S≤0.01%; Al: 3.5%; rare earth RE: 0.02%, the rest is Fe and other unavoidable impurities;

[0053]Dosing according to the above ingredients: put steel scrap, carbon ferrochrome, low-carbon ferrochrome or iron filings, pig iron, ferrochrome, titanium or ferro-titanium, niobium or ferro-niobium into the furnace after batching according to the chemical ratio, induction furnace or Vacuum induction furnace melting, pouring temperature 1540 ℃ ~ 1550 ℃, pouring 3 hours after unpacking and air cooling. Subsequent heat treatment process can be carried out as follows: homogenization annealing at 1220°C for 1 hour, furnace cooling to 850°C, heat preservation for 4 hours, and air cooling to room temperature.

Embodiment 3

[0054] Embodiment 3: the high-strength, toughness, high-temperature wear-resistant and corrosion-resistant cast steel for incinerator grate of the present invention has the weight percentage of its chemical composition: C: 0.2%; Si: 1.2%; Mn: 0.8%; Cr: 20 ; Al: 2.5%, ; Nb: 0.15% and Ti: 0.06%, the balance being Fe and unavoidable impurities.

[0055] According to the above ingredient distribution, smelting in induction furnace or vacuum induction furnace, raising the temperature to 1550°C, adding 2% of the weight of molten steel to deoxidize aluminum and adjusting the aluminum composition of molten steel, and inserting 0.2% silicon-calcium further into the molten steel to about 1560°C After deoxidation, remove all the slag, stir the molten steel, and tap the furnace; the pouring temperature is 1550°C, pouring for 3 hours, then open the box and air cool. Subsequent heat treatment process can be carried out as follows: homogenization annealing at 1220°C for 1 hour, furnace cooli...

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Abstract

The invention discloses a high-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for an incinerator fire grate and a preparation method thereof. The high-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for the incinerator fire grate comprises, by weight percentage, 0.18%-0.42% of C, 0.8%-2.0% of Si, 0.5%-1.2% of Mn, 15%-25% of Cr, 0-0.015% of P, 0-0.01% of S, 1.5%-3.5% of Al and 0.005%-0.02% of RE. When C is smaller than 0.25% and Cr is smaller than 20%, the high-strength and high-toughness cast steel further comprises 0.05%-0.25% of Nb and 0.05%-0.25% of Ti. The high-strength and high-toughness cast steel is prepared by the steps of sorting, smelting, refining, deoxidation, modification fining, casting and the like. The cast steel has the good casting molding performance and machining performance, high strength, good ductility and toughness, superior abrasion and corrosion resistance in high temperature, low production cost and long service life, and is especially suitable for large mechanical reciprocating grates of municipal refuse incinerators in China.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates to a high-temperature wear-resistant and corrosion-resistant cast steel used in a grate system in a garbage incinerator and a preparation method thereof. Background technique [0002] The grate piece is an important part of the garbage incinerator to push the garbage and make it fully burnt. Its service condition is harsh, and it has been working under heavy load and high temperature corrosion and oxidation atmosphere for a long time. Usually, after a period of operation, the grate parts will appear to a certain extent. The severe wear of the surface corrosion oxidant, accompanied by jamming, warping or even fracture, directly leads to the unsmooth operation of the grate, affects the operation of the incinerator, causes the shutdown of the furnace for maintenance, and affects the benefits of the enterprise. Improving the service life of the incinerator g...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C38/26C22C38/06C22C38/04C22C38/02C22C33/04C21D1/26
CPCC21D1/26C22C33/04C22C38/005C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28Y02P10/20
Inventor 陈善平张益安淼张瑞娜王晓东付立铭单爱党周洪权邰俊张智
Owner SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD
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