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Low-nickel austenite heatproof cast steel and smelting method thereof

A heat-resistant cast steel and austenitic technology, applied in the field of iron and steel smelting, can solve the problems of large Ni usage, large fluctuations, and increased product costs, so as to reduce the content of oxidized inclusions, reduce the dosage, and suppress grain boundary carbides The effect of precipitation

Active Publication Date: 2012-03-14
沈阳科金特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country is a country that lacks Ni resources, and the amount of Ni used is huge, while the price of Ni for production has been influenced and controlled by foreign countries for a long time, and fluctuates greatly, resulting in an increase in product costs, which limits the production of heat-resistant cast steel in my country. a bottleneck problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: 0.7wt.% nickel austenitic heat-resistant cast steel and its melting method.

[0012] A 5t intermediate frequency induction furnace is used to melt low-nickel austenitic heat-resistant cast steel, and the whole melting process is protected by argon gas. 2. Put the above-mentioned raw materials and 0.1-0.3% rare earth (0.2% in this example) into a 5t intermediate frequency induction furnace for melting; 3. The low-nickel austenite heat-resistant In cast steel smelting, the smelting power is in the range of 500-1200KW (800KW in this example), and the smelting power is in the range of 1000-1200KW (1000KW in this example); After cleaning, add chromium nitride in small quantities in batches, and control the melting power at this time in the range of 500-700KW (600KW in this embodiment), and continue to use Si-Ca and rare earth to deoxidize molten steel during the melting of chromium nitride; 5. In the smelting of the low-nickel austenitic heat-resistant cast s...

Embodiment 2

[0020] Embodiment 2: 0.8wt.% nickel austenitic heat-resistant cast steel and its melting method.

[0021] The difference from Example 1 is that the prepared austenitic heat-resistant cast steel contains 0.8wt.% nickel.

[0022] A 5t intermediate frequency induction furnace is used to smelt low-nickel austenitic heat-resistant cast steel with industrial pure iron, electrolytic nickel, electrolytic manganese, high-carbon ferrochrome, and ferrosilicon. The whole melting process is protected by argon. Put the raw materials and 0.2% rare earth into the medium frequency induction furnace, choose 850KW melting power for casting steel melting, and the melting power is 1100KW during the melting period. After all the raw materials are cleared, chromium nitride is added in small quantities in multiple batches, and the melting power at this time is controlled to 600KW. During the melting of chromium nitride, Si-Ca and rare earths are used to deoxidize molten steel. During the smelt...

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Abstract

The invention relates to low-nickel austenite heatproof cast steel and a smelting method thereof. The cast steel is characterized in that: the cast steel comprises components of, by weight: 0.70-1.0% of C, 2.50-3.50% of Si, 12.0-14.0% of Mn, 19.0-22.0% of Cr, 0.4-1.0% of Ni, 0.35-0.50% of N, and balance of Fe and inevitable impurities. The smelting method comprises steps of: raw material preparing, feeding, material melting, calcium silicon and rare earth deoxidating, electromagnetic stirring, calcium silicon deoxidating, and ingot casting. According to the method, the cast steel is smelted by using a medium frequency induction furnace; components of the heatproof cast steel are optimized; smelting power is regulated; an electromagnetic stirring + argon shield refining method is adopted; and a calcium silicon + rare earth combined deoxidation method is adopted, such that low-nickel austenite heatproof cast steel is smelted. Through the regulation of the contents and ratio of C, N, andMn elements in the low-nickel austenite heatproof cast steel, the nickel content can be reduced, and stable monophase austenite tissues can be formed.

Description

technical field [0001] The invention relates to a heat-resistant cast steel and a smelting method thereof, in particular to a low-nickel austenitic heat-resistant cast steel and a smelting method thereof, belonging to the technical field of iron and steel smelting. Background technique [0002] Heat-resistant cast steel has good high-temperature strength and high-temperature oxidation resistance, and is widely used in heat-resistant fields such as high-temperature heating furnaces and boiler equipment. In order to improve the service temperature and high-temperature oxidation resistance of heat-resistant cast steel, heat-resistant cast steel used above 1000°C usually contains a relatively high proportion of Cr, and at the same time, more precious metal Ni is added to achieve the expansion of austenite. phase zone and the purpose of stabilizing austenite. For example, the commonly used 4Cr25Ni20Si2 steel (referred to as 25-20 steel) in the boiler burner nozzle of a power pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C33/04
Inventor 刘智勇赵忠刚李爱民李宁岳景东林静萨仁格日乐孙玲玲
Owner 沈阳科金特种材料有限公司
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