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Process method for producing 1 ton of I-690 alloy electroslag remelted ingot in industrialized mode

A technology of electroslag remelting and process method, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of falling below 20ppm, unsatisfactory, unsatisfactory effect, etc., and achieve the effect of stable remelting process

Active Publication Date: 2013-04-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electroslag remelting of I-690 alloy, which used to use CaF 2 :Al 2 o 3 :CaO:MgO=71:15:9:5 (mass ratio) quaternary slag system, remelting adopts a single argon protection method, the effect is not very ideal, it is difficult to reduce the oxygen content of the alloy after remelting to below 20ppm , cannot meet the needs of actual use. Therefore, it is particularly necessary to formulate a process suitable for remelting I-690 alloy, and an electroslag remelting process that can reduce the content of O and S in the alloy.

Method used

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  • Process method for producing 1 ton of I-690 alloy electroslag remelted ingot in industrialized mode
  • Process method for producing 1 ton of I-690 alloy electroslag remelted ingot in industrialized mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A process method for industrialized production of 1 ton of I-690 alloy electroslag remelting ingot, the remelting electrode is smelted in a vacuum induction furnace, and the specific operation steps are as follows:

[0031] 1) Before remelting, clean the bottom surface of the crystallizer and the inside of the crystallizer. The size of the electrode rod is Φ240mm. The surface must not have serious cracks, heavy skin, fins, scars and slag inclusions. Rust, grease and refractory material fragments adhered to the surface have been cleaned; the crystallizer size is Φ340 / 380×1500mm, and the electrode rod is used after baking at 700°C for 10 hours;

[0032] 2) First, use a polishing wheel to polish the surface of the copper plate on the bottom water tank to remove the adhesion on it;

[0033] 3) Put the dummy plate in the center of the copper plate above the bottom water tank, take the starting plate and place it in the center of the dummy plate, put the solid conductive slag...

Embodiment 2

[0042] The difference with Example 1 is:

[0043] 1) The proportion of slag used is (mass percentage): 52% calcium fluoride, 22% calcium oxide, 20% alumina, 3% titanium dioxide, and the rest is MgO. The purity of each component of the slag system is >98.5%, and the unstable oxide impurities are manganese oxide (MnO), ferrous oxide (FeO), silicon dioxide (SiO 2) total content is less than 0.5%, and the particle size is less than 50 mesh. The slag is used after being baked at 680°C for 10 hours, and the evenly mixed slag is added to the crystallizer at one time. After the slag is added, the gas flame circle is ignited;

[0044] 2) The dummy plate used is made of pure iron, the diameter is 15mm smaller than the diameter of the inner hole at the lower end of the crystallizer, and the thickness is 12mm; the starting plate is an I-690 electrode slice, the diameter is the same as the electrode diameter, and the thickness is 30mm;

[0045] 3) The argon flow rate at the bottom of the...

Embodiment 3

[0048] The difference with embodiment 1 is:

[0049] 1) The proportion of slag used is (mass percentage): 55% calcium fluoride, 18% calcium oxide, 20% alumina, 3% titanium dioxide, and the rest is MgO. The purity of each component of the slag system is >98.5%, and the unstable oxide impurities are manganese oxide (MnO), ferrous oxide (FeO), silicon dioxide (SiO 2 ) total content is less than 0.5%, and the particle size is less than 50 mesh. The slag is used after being baked at 680°C for 10 hours, and the evenly mixed slag is added to the crystallizer at one time. After the slag is added, the gas flame circle is ignited;

[0050] 2) The starting plate is an I-690 electrode slice, the diameter is the same as that of the electrode, and the thickness is 30mm;

[0051] 3) The argon flow rate at the bottom of the crystallizer is 90L / min, and the argon flow rate at the upper part is 50L / min.

[0052] The chemical composition analysis data of the I-690 alloy after remelting are sh...

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Abstract

The invention belongs to the technical field of electroslag remelting, relates to improvement on a process for producing Inconel 690 alloy electroslag remelted ingot in an industrialized mode, in particular to a process method for producing 1 ton of I-690 alloy electroslag remelting ingot in an industrialized mode. A vacuum induction furnace smelts an electrode bar of phi 240 mm; the size of a crystallizer is phi 340 / 380*1,500 mm; the remelting process parameters comprise: remelting voltage of 47 to 55 V, current of 7,500 to 8,500 A and slag quantity of 38 to 45 kg; according to the I-690 alloy component requirement, the remelting adopts a new proportioned pentabasic slag system; the components comprise calcium fluoride, calcium oxide, aluminum oxide, magnesium oxide and titanium dioxide; the purity of each component is required to be more than 98.5 percent; the total content of unstable oxide impurities such as manganese oxide, ferrous oxide and silica is less than 0.5 percent; the granularity is less than 50 meshes; before the remelting process, the electrode is roasted at the temperature of 700 DEG C for 8 to 12 hours and the slag is roasted at the temperature of 680 DEG C for 8 to 12 hours for use; and in the remelting process, argon and burning gas are adopted for protection. By the process, the content of the remelted I-690 alloy is reduced to be below 20 ppm, the sulfur content is reduced to be below 5 ppm, oxide inclusion is effectively removed, and high-quality remelted alloy is obtained.

Description

technical field [0001] The invention relates to the field of electroslag remelting, in particular to a kind of industrial production of 1 ton of I-690 alloy electroslag [0002] Process method for remelting ingots. Background technique [0003] Inconel690 (hereinafter referred to as I-690) alloy is an American brand, and its main components are as follows: [0004] Table 1 Inconel690 alloy main composition range [0005] [0006] I-690 alloy is a nickel-based superalloy used in nuclear power steam generators. It requires excellent resistance to stress corrosion cracking, good metallurgical stability and excellent processing performance. However, impurity elements such as O and S in the alloy are fatal elements that affect its performance. S greatly reduces the processing performance of the alloy. The content of the alloy can reduce the content of inclusions in the alloy and improve the performance of the alloy. Electroslag remelting of I-690 alloy, which used to use C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22B9/187
CPCY02P10/25
Inventor 马颖澈查向东高明张龙刘奎张顺南李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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