Method for avoiding iron element enrichment in head part of zirconium alloy ingot casting

Abstract

The invention discloses a method for avoiding iron element enrichment in the head part of a zirconium alloy ingot casting. The method comprises the steps that firstly, raw materials are selected according to a target zirconium alloy ingot casting; secondly, nuclear grade zirconium grains and the component raw materials of the target zirconium alloy ingot casting are subjected to batching and smelting so as to obtain an intermediate alloy A and an intermediate alloy B, and the mass content of iron in the intermediate alloy A is 4% to 10% lower than that in the intermediate alloy B; thirdly, a consumable electrode A and a consumable electrode B is prepared from nuclear grade sponge zirconium correspondingly with the intermediate alloy A and the intermediate alloy B; and fourthly, the consumable electrode A and the consumable electrode B are welded to form a consumable electrode, the consumable electrode A is used as a head, and the zirconium alloy ingot casting is obtained by melting. According to the method for avoiding the iron element enrichment in the head part of the zirconium alloy ingot casting, intermediate alloys with different Fe contents are prepared, the intermediate alloys with low Fe contents are prepared into the consumable electrodes for head part melting of the target zirconium alloy ingot casting, the zirconium alloy ingot casting is obtained by vacuum melting,segregation of iron element in the head part of the zirconium alloy casting is avoided, removal of the head part of the zirconium alloy ingot casting is avoided, and the yield is improved.

Description

technical field

[0001] The invention belongs to the technical field of preparation of zirconium alloy ingots, and in particular relates to a method for solving the problem of iron element enrichment at the head of zirconium alloy ingots. Background technique

[0002] Nuclear fuel element cladding zirconium alloy is one of the key core materials of nuclear power reactors. The advancement, safety, reliability and economy of nuclear power are closely related to the performance of the cladding materials used. In the past 30 years, the performance of Zr-4 alloy in PWR fuel cladding is satisfactory. With the development of nuclear power reactor technology in the direction of increasing fuel burnup, reducing fuel cycle costs, improving reactor thermal efficiency, and improving safety and reliability, higher requirements are put forward for the performance of zirconium alloy, the key core component fuel element cladding material. Including corrosion performance, hydrogen absorption...

Examples

Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Step 1, material preparation: select 2.2kg of zirconium particles, 980.7kg of nuclear-grade sponge zirconium, 13.5kg of Sn, 2.2839kg of Fe and 1.3kg of Cr according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Prepare materials;

[0029]Step 2, the preparation of master alloy: the Fe of 0.2139kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.2346kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.4Pa, and the pressure rise rate before smelting is 0.18Pa / min; the mass content of Fe in the master alloy A is 0.2139%, and the number of master alloy A is 48; the mass content of Fe in the master alloy B is is 0....

Embodiment 2

[0039] This embodiment includes the following steps:

[0040] Step 1, material preparation: select 2.1942kg nuclear-grade zirconium particles, 980.715kg nuclear-grade zirconium sponge, 13.5kg of Sn, 2.2908kg of Fe and 1.3kg according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Cr for material preparation;

[0041] Step 2, the preparation of master alloy: the Fe of 0.2208kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.2272kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.42Pa, and the pressure rise rate before smelting is 0.2Pa / min; the mass content of Fe in the master alloy A is 0.2208%, and the number of master alloy A is 48; the mass content of Fe in the master...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1, material preparation: select 2.21kg nuclear-grade zirconium particles, 980.713kg nuclear-grade zirconium sponge, 13.5kg of Sn, 2.277kg of Fe and 1.3kg according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Cr for material preparation;

[0047] Step 2, the preparation of master alloy: the Fe of 0.207kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.241kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.44Pa, and the pressure rise rate before smelting is 0.2Pa / min; the mass content of Fe in the master alloy A is 0.207%, and the number of master alloy A is 48; the mass content of Fe in the master alloy...

technical field

[0001] The invention belongs to the technical field of preparation of zirconium alloy ingots, and in particular relates to a method for solving the problem of iron element enrichment at the head of zirconium alloy ingots. Background technique

[0002] Nuclear fuel element cladding zirconium alloy is one of the key core materials of nuclear power reactors. The advancement, safety, reliability and economy of nuclear power are closely related to the performance of the cladding materials used. In the past 30 years, the performance of Zr-4 alloy in PWR fuel cladding is satisfactory. With the development of nuclear power reactor technology in the direction of increasing fuel burnup, reducing fuel cycle costs, improving reactor thermal efficiency, and improving safety and reliability, higher requirements are put forward for the performance of zirconium alloy, the key core component fuel element cladding material. Including corrosion performance, hydrogen absorption...

Examples

Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Step 1, material preparation: select 2.2kg of zirconium particles, 980.7kg of nuclear-grade sponge zirconium, 13.5kg of Sn, 2.2839kg of Fe and 1.3kg of Cr according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Prepare materials;

[0029]Step 2, the preparation of master alloy: the Fe of 0.2139kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.2346kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.4Pa, and the pressure rise rate before smelting is 0.18Pa / min; the mass content of Fe in the master alloy A is 0.2139%, and the number of master alloy A is 48; the mass content of Fe in the master alloy B is is 0....

Embodiment 2

[0039] This embodiment includes the following steps:

[0040] Step 1, material preparation: select 2.1942kg nuclear-grade zirconium particles, 980.715kg nuclear-grade zirconium sponge, 13.5kg of Sn, 2.2908kg of Fe and 1.3kg according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Cr for material preparation;

[0041] Step 2, the preparation of master alloy: the Fe of 0.2208kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.2272kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.42Pa, and the pressure rise rate before smelting is 0.2Pa / min; the mass content of Fe in the master alloy A is 0.2208%, and the number of master alloy A is 48; the mass content of Fe in the master...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1, material preparation: select 2.21kg nuclear-grade zirconium particles, 980.713kg nuclear-grade zirconium sponge, 13.5kg of Sn, 2.277kg of Fe and 1.3kg according to the composition and content of each component in the target product Zr-4 zirconium alloy ingot Cr for material preparation;

[0047] Step 2, the preparation of master alloy: the Fe of 0.207kg, the Sn of 1.35kg, the Cr of 0.13kg and the nuclear-grade zirconium grain of 0.241kg carry out batching and obtain 1.928kg master alloy A through secondary smelting, the Fe of 2.07kg, 12.15kg of Sn, 1.17kg of Cr and 1.967kg of nuclear-grade zirconium grains were batched and 17.357kg of master alloy B was obtained through secondary melting; The temperature is 0.44Pa, and the pressure rise rate before smelting is 0.2Pa / min; the mass content of Fe in the master alloy A is 0.207%, and the number of master alloy A is 48; the mass content of Fe in the master alloy...

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