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Austenitic stainless steel clad tube and technique of preparing the same

A technology of austenitic stainless steel and cladding tubes, applied in the field of alloys, can solve problems such as not being able to meet the needs of fast reactor element rods, achieve excellent surface quality of tubes, and ensure dimensional tolerances

Active Publication Date: 2010-11-17
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a new stainless steel cladding tube and its preparation process aiming at the fact that the existing stainless steel thin-walled tubes cannot meet the needs of fast reactor element rods

Method used

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Examples

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Effect test

Embodiment 1

[0040] The technical solution provided by the present invention is used to prepare the element rod cladding of the sodium-cooled fast reactor boron carbide shielding assembly, the size is φ19.2×1 (mm), and the weight is 700kg.

[0041] Concrete preparation steps are as follows:

[0042] (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. During the smelting process, pure metals are used for ingredients, and the addition of rare earth elements is prohibited. After smelting, use a rod and wire rod rolling machine to open the billet to make a stainless steel plate billet.

[0043] (2) Thermal processing. The selected heat treatment method should ensure the disso...

Embodiment 2

[0051] Proportioning is with embodiment 1. The difference is that during smelting, the first time is smelting in argon-oxygen furnace, and the second time is electroslag remelting.

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Abstract

The invention discloses an austenitic stainless steel cladding tube used for a sodium-cooled fast reactor as well as a method for the production thereof. The stainless steel cladding tube 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 to2.0 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 double-smelting is adopted when in smelting, and the adding of rare earth elements is prohibited; the hydrogen protection or vacuum bright annealing treatment is adopted when in hot working; and a drawing process of empty sinking is banned in the cold working process, and the polishing treatment tosurfaces of finished pipes by mechanical method is prohibited. The stainless steel cladding tube made by the process 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 an austenitic stainless steel cladding tube for a boron carbide absorber element rod used in a sodium-cooled fast reactor and a preparation process thereof. Background technique [0002] The sodium-cooled fast reactor boron carbide absorber element rod works in a high-temperature sodium medium environment of 350 ℃ ~ 550 ℃, and withstands fast neutron irradiation with a dose of up to 50dpa. The absorber rod is ventilated. The cladding tube of this kind of absorber rod (such as control rod and shielding rod) is a cold-worked thin-walled austenitic stainless steel tube (outer diameter 10-20mm, wall thickness 0.5-1mm, cold working degree 15-20%) ), the outer side is in contact with high-temperature sodium, and the built-in nuclear-grade boron carbide pellets. Therefore, this cladding material must have good compatibility with sodium and boron carbide under high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C1/02C22B9/16C21D9/08
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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