Process for industrially producing ultrapure Inconel 690 (I-690) alloy electroslag remelting ingot of 3 tons

A process method, the technology of electroslag remelting, which is applied in the field of electroslag remelting, can solve the problems of difficult control of structure and control of O content, etc., and achieve the effects of improving thermal processing performance, uniform structure composition, and improving high-temperature plasticity

Active Publication Date: 2015-04-01
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

However, the effective control of O content has always been a difficult problem in high temperature and precision alloy remelting, especially the larger the remelting tonnage, the more difficult it is to control the O content, and the thicker the diameter, the more difficult it is to control the structure

Method used

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  • Process for industrially producing ultrapure Inconel 690 (I-690) alloy electroslag remelting ingot of 3 tons
  • Process for industrially producing ultrapure Inconel 690 (I-690) alloy electroslag remelting ingot of 3 tons
  • Process for industrially producing ultrapure Inconel 690 (I-690) alloy electroslag remelting ingot of 3 tons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A process for industrialized production of 3 tons of I-690 alloy electroslag remelting ingots, the specific steps are as follows:

[0037] 1) Electrode preparation: The electrode size adopts the specification of φ430mm×2980mm. Before remelting, the electrode is cut and polished to ensure that the two ends are parallel and flat, and the cylindrical surface is polished clean. The surface must not have serious cracks, heavy skin, fins, Defects such as scars and slag inclusions, no scale or rust, and grease and refractory fragments adhering to the surface are cleaned; and baked at 700 ° C for 8 hours.

[0038] 2) Prepare the crystallizer: The crystallizer specifications are the diameter of the upper inner opening is 503mm, the diameter of the lower inner opening is 527mm, and the length is 2400mm; before remelting, clean the dirt on the inner surface of the crystallizer to ensure that the surface is dry and free of dirt.

[0039] 3) Use polishing equipment to polish the sur...

Embodiment 2

[0052] The difference with Example 1 is:

[0053] The ratio of the slag used is (mass fraction): 64% of calcium fluoride, 16% of calcium oxide, 15% of aluminum oxide, 1.5% of titanium dioxide, and the rest is magnesium oxide.

[0054] The thickness of the first starting plate is 7mm, the diameter of its outer circle is 40mm larger than the diameter of the inner hole at the lower end of the crystallizer, and the diameter of the inner circle is 17mm smaller than the diameter of the second starting plate; the thickness of the second starting plate is 40mm.

[0055] When feeding argon gas into the crystallizer, the gas flow rate is 180L / min, keep it for 35min until the residual oxygen content in the gas hood is lower than 0.5% capacity, and adjust the argon flow rate to 55L / min. The steady state melting rate during the steady state melting period was 7.8 kg / min. The chemical composition analysis data of the alloy after remelting are shown in Table 4.

Embodiment 3

[0057] The difference with Example 1 is:

[0058] The ratio of the slag used is (mass fraction): 63% of calcium fluoride, 14% of calcium oxide, 16% of aluminum oxide, 2% of titanium dioxide, and the rest is magnesium oxide.

[0059] The thickness of the first starting plate is 6mm, the diameter of its outer circle is 30mm larger than the diameter of the inner hole at the lower end of the crystallizer, and the diameter of the inner circle is 20mm smaller than the diameter of the second starting plate; the thickness of the second starting plate is 30mm.

[0060] When feeding argon gas into the crystallizer, the gas flow rate is 150L / min, keep it for 40min until the residual oxygen content in the gas hood is lower than 0.5% capacity, and adjust the argon flow rate to 50L / min. The steady state melting rate during the steady state melting period was 7.2 kg / min. The chemical composition analysis data of the alloy after remelting are shown in Table 4.

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Abstract

The invention belongs to the technical field of electroslag remelting and relates to an improvement of a process for industrially producing Inconel 690 (I-690) alloy electroslag remelting ingots, in particular to a process for industrially producing an ultrapure low-segregation I-690 alloy electroslag remelting ingot of 3 tons. An electrode bar smelted by a vacuum induction furnace is phi430mm in dimension, and a crystallizer is phi503 / phi527mm*2400mm in dimension. Remelting process parameters are shown as follows: according to the requirements of I-690 alloy components, a five-component premelting slag system with a new proportion is adopted by the remelting, wherein the five-component premelting slag system comprises the five components: calcium fluoride, calcium oxide, aluminum oxide, magnesium oxide and titanium dioxide, and the total content of unstable oxide impurities, such as manganese oxide, ferrous oxide and silicon oxide, is less than 0.5 percent. Before the remelting is performed, an electrode is used after being baked at 700 DEG C for 8 hours, a slag charge is used after being baked at 680 DEG C for 8 hours, and argon shield is adopted during a remelting process. According to the process, the oxygen content of I-690 alloy after the remelting is performed can be reduced to 20 parts per million (ppm) or below, and thus, the goal of no oxygenation or less oxygenation is achieved after the remelting is performed. Moreover, sulfur content is reduced to 5ppm or below; the oxide inclusion grade is lower than 1, and the alloy after the remelting is performed is even in structure component, and therefore, the high-quality remelting alloy is obtained.

Description

technical field [0001] The invention relates to the field of electroslag remelting, in particular to a process for industrially producing 3 tons of I-690 alloy electroslag remelting ingots Background technique [0002] Inconel690 (hereinafter referred to as I-690) alloy is an American brand, and its main components are as follows: [0003] Table 1 Inconel690 alloy main composition range [0004] [0005] 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. The impurity elements such as O and S in the alloy are fatal elements that affect its performance. O is the main forming element of the inclusions in the alloy, and its content in the alloy should be reduced as much as possible, thereby reducing the content of inclusions and improving the quality of the alloy. performance. However, the effective control of O con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/10C22C19/05C22C1/02C22B9/18
CPCY02P10/25
Inventor 查向东高明马颖澈张龙张建国万柏方张顺南刘奎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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