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Wire-winding screw and method for preparing same

A winding and spiraling technology, which is applied in the field of variable-diameter spiral wound by wire and its preparation, can solve the problems that cannot meet the needs of throttling of fast reactor element rods, and achieve excellent wire surface quality and roughness. Effect

Inactive Publication Date: 2008-12-31
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a new wire-wound spiral and its preparation method in view of the fact that the existing wire-wound spiral cannot meet the throttling requirements of fast reactor element rods.

Method used

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  • Wire-winding screw and method for preparing same

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Effect test

Embodiment 1

[0038] The technical scheme provided by the invention is used to prepare a wire-wound variable-diameter spiral for a sodium-cooled fast reactor stainless steel reflection layer assembly.

[0039] Concrete preparation steps are as follows:

[0040] (1) According to the following composition and weight ratio, and use vacuum induction melting furnace and consumable electrode vacuum electric arc furnace to smelt molten steel respectively: 0.04% to 0.08% of C; ≤0.75% of Si; ≤0.02% of P ;≤0.02% S; 1.5%~2.0% Mn; 11.0%~14.0% Ni; 16.0%~18.0% Cr; 2.0%~3.0% Mo; 0.3%~0.5% Ti;≤0.1% ≤0.002% of B; ≤0.035% of N; the rest is Fe. Use pure metals for ingredients, and prohibit the addition of rare earth elements during the smelting process. Use a rod and wire rod rolling machine to make blanks to make stainless steel disc blanks.

[0041] (2) Thermal processing.

[0042] (3) cold drawn.

[0043] (4) Annealing.

[0044] (5) Winding. The polished stainless steel wire in step (9) transitions ...

Embodiment 2

[0048] Proportioning is with embodiment 1. The difference is that during smelting, the first time is smelting in an argon-oxygen furnace, and the second time is electroslag remelting; after winding, heat treatment is carried out at 350 ° C to 380 ° C for 2 to 3 hours.

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Abstract

The invention discloses a variable diameter screw wound by a wire material and used for a sodium-cooled fast reactor core subassembly as well as a method for the production thereof. The wire material has components, in weight proportion: 0.04 percent to 0.08 percent of C; less than or equal to 0.75 percent of Si; less than or equal to 0.02 percent of P; less than or equal to 0.02 percent of S; 1.5 percent to 2.0 percent of Mn; 11.0 percent to 14.0 percent of Ni; 16.0 percent to 18.0 percent of Cr; 2.0 percent to 3.0 percent of Mo; 0.3 percent to 0.5 percent of Ti; less than or equal to 0.1 percent of Co; less than or equal to 0.002 percent of B; less than or equal to 0.035 percent of N; balance Fe. The preparation process comprises: preserving the heat of the wound variable diameter screw at a temperature of between 450DEG C and 480DEG C for 30 to 50 minutes for heat treatment, or preserving the heat thereof at a temperature of between 350DEG C and 380DEG C for 2 to 3 hours for heat treatment; and finally conducting the electrochemical polish to the shaped variable diameter screw. The variable diameter screw prepared by the technical proposal can meet the requirements of the sodium-cooled fast reactor core subassembly.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a variable-diameter spiral for wire winding of a sodium-cooled fast reactor core assembly and a preparation method thereof. Background technique [0002] The wire-wound spiral is suitable for sodium-cooled fast reactor core components. As a part of the throttling device, it can reduce the sodium leakage flow at the top and bottom of the tube pin, and ensure that the coolant with a specified flow rate passes through different flow areas. sodium. The wire-wound spiral works in a high-temperature sodium medium environment of 350 ° C ~ 400 ° C, and the fast neutron radiation dose is very high. Although it is made of stainless steel and has the appearance of a cylindrical spring, it does not have the function of a spring and has low compressive strength. In addition, in order to ensure the throttling effect in the operating state of the reactor, the material of the spiral...

Claims

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Application Information

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IPC IPC(8): C22C38/58B23P15/00C21D9/00C21D1/26
Inventor 张汝娴王晓荣谢光善黄晨钱顺发
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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