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GH907 alloy smelting method

A GH907, smelting method technology, applied in the smelting field of GH907 alloy, can solve the problems of high content of impurity elements, reduction of alloy durability, large performance fluctuations, etc., to reduce the content of impurity elements, improve quality stability, and prolong smelting time Effect

Inactive Publication Date: 2021-11-19
AVIC SHANGDA METAL REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the raw materials of GH907 alloy produced in China are mostly new raw materials such as metal nickel, metal cobalt, metal niobium, and metal titanium, as well as refined low-carbon, low-silicon, low-aluminum, low-chromium steel materials that have been refined, and even higher-cost nickel-niobium alloys. The cost of these raw materials is much higher than the price of imported materials, which leads to the disadvantage of the domestically produced GH907 alloy in the international market competition
Moreover, the new raw materials in the raw materials of the GH907 alloy produced by the existing domestic technology often come from ores in different mines, and the content of impurity elements is relatively high and unstable. The high content of phosphorus in the GH907 alloy will reduce the durability of the alloy. , the chromium element is the main factor affecting the thermal expansion coefficient of the alloy, the lower the chromium content, the lower the expansion coefficient
Therefore, if all new raw materials are used to smelt the GH907 alloy, the content of phosphorus and chromium in the final product will increase, thereby reducing the durability of the alloy, increasing the expansion coefficient of the alloy, and ultimately leading to uncontrollable quality stability of the produced GH907 alloy. , the performance fluctuates greatly

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Embodiment 1

[0028] The present embodiment provides a kind of smelting method of GH907 alloy, comprises the following steps:

[0029] (1) Heat carbon, metallic nickel, fine steel, metallic cobalt, and ferrosilicon alloy to 1440°C for melting, with a melting power of 1,000KW. After all the raw materials are melted, add recycled materials for smelting. The quality of recycled materials is equal to the quality of all raw materials. 30%, the melting power after adding recycled materials is 1400KW.

[0030] (2) Refining the smelted melt for 65 minutes at a vacuum degree of less than 5Pa and a temperature of 1480°C, stirring and degassing, sampling and monitoring the oxygen and nitrogen content in the alloy. The standard for the oxygen and nitrogen content in the melt is: Oxygen content ≤ 20ppm, nitrogen content ≤ 50ppm, if the oxygen content in the melt is greater than 20ppm, add aluminum and carbon to the melt for deoxidation, aluminum is added to the melt, the aluminum content accounts for 0....

Embodiment 2

[0033] The present embodiment provides a kind of smelting method of GH907 alloy, comprises the following steps:

[0034] (1) Heat carbon, metallic nickel, fine steel, metallic cobalt, and ferrosilicon alloy to 1480°C for smelting. The melting power is 400KW. After all the raw materials are melted, add recycled materials for smelting. The quality of recycled materials is equal to the mass of all raw materials. 50%, the melting power after adding recycled materials is 1000KW.

[0035] (2) Refining the smelted melt for 55 minutes at a vacuum degree of less than 5Pa and a temperature of 1520°C, stirring and degassing, sampling and monitoring the oxygen and nitrogen content in the alloy. The standard for the oxygen and nitrogen content in the melt is: Oxygen content ≤ 20ppm, nitrogen content ≤ 50ppm, if the oxygen content in the melt is greater than 20ppm, add aluminum and carbon to the melt for deoxidation, aluminum is added to the melt, the aluminum content accounts for 0.02% of ...

Embodiment 3

[0038] The present embodiment provides a kind of smelting method of GH907 alloy, comprises the following steps:

[0039] (1) Heat carbon, metallic nickel, refined steel, metallic cobalt, and ferrosilicon alloy to 1460°C for smelting. The melting power is 700KW. After all the raw materials are melted, add recycled materials for smelting. The quality of recycled materials is equal to the mass of all raw materials. 45%, the melting power after adding recycled materials is 1200KW.

[0040] (2) Refining the smelted melt for 60 minutes at a vacuum degree of less than 5Pa and a temperature of 1500°C, stirring and degassing, sampling and monitoring the oxygen and nitrogen content in the alloy. The standard for the oxygen and nitrogen content in the melt is: Oxygen content ≤ 20ppm, nitrogen content ≤ 50ppm, if the oxygen content in the melt is greater than 20ppm, add aluminum and carbon to the melt for deoxidation, aluminum is added to the melt, the aluminum content accounts for 0.015%...

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Abstract

The invention relates to the technical field of alloy material smelting, in particular to a GH907 alloy smelting method. The method comprises the following steps: 1, heating and smelting carbon, metal nickel, refined steel, metal cobalt and ferrosilicon alloy, adding a reclaimed material after all the raw materials are smelted, and smelting; 2, refining a smelted melt for 55-65 minutes under the conditions that the vacuum degree is less than 5 Pa and the temperature is 1480-1520 DEG C, then carrying out deoxidation and denitrification operation, adding metal aluminum, metal titanium and metal niobium into the melt, then carrying out alloying treatment, and adding metal manganese and ferroboron alloy after the alloying treatment is finished; and 3, pouring. The method provided by the invention is simple to operate, and GH907 alloy is prepared by the method of co-smelting the reclaimed material and the brand new raw material, so that not only can the production cost of the GH907 alloy be greatly reduced, but also the quality stability of the GH907 alloy and the performance level of the GH907 alloy can be improved.

Description

technical field [0001] The invention relates to the technical field of alloy material smelting, in particular to a GH907 alloy smelting method. Background technique [0002] GH907 alloy is a precipitation-strengthened austenitic alloy based on iron-nickel-cobalt. It is comprehensively strengthened with Nb, Ti, Si and trace B. It has high tensile strength and low expansion coefficient below 650 °C. , good resistance to cold and heat fatigue, good welding performance and good resistance to high-pressure hydrogen embrittlement and almost constant elastic modulus, are widely used as engine turbine outer rings, sealing rings, etc., especially for manufacturing An important casing component of an aero-engine is used to precisely control the gap between the turbine blades and the outer ring, improve the performance of the engine, and increase the combustion efficiency. [0003] At present, the raw materials of GH907 alloy produced in China are mostly new raw materials such as meta...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C30/02C22C1/03C22C1/06
CPCC22C30/00C22C30/02C22C1/03C22C1/06C22C19/057C22C1/023C22C38/52C22C38/06C22C38/50C22C38/48C22C38/04C22C38/54C22C38/42C22C38/44C22C38/02C22C33/06C22C33/006
Inventor 闫森栾吉哲李爱民田水仙张欢欢罗保帅
Owner AVIC SHANGDA METAL REGENERATION TECH