ODS ferritic stainless steel fuel cladding tube and preparation method thereof

A ferrite and ODS technology, applied in the direction of reactor fuel elements, manufacturing tools, heat treatment equipment, etc., can solve the problem that ODS steel cladding pipes cannot be applied to small special reactors with outlet temperature, and achieve long-term reliable mechanical strength and oxidation/corrosion resistance , good surface quality, excellent high temperature long-term strength effect

Pending Publication Date: 2022-03-04
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the current ODS steel cladding tubes cannot meet the requirements of small special reactors with high outlet temperature, and the purpose is to provide an ODS ferritic stainless steel fuel cladding tube and its preparation method to fill the gap in China. solve the above problems

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  • ODS ferritic stainless steel fuel cladding tube and preparation method thereof
  • ODS ferritic stainless steel fuel cladding tube and preparation method thereof
  • ODS ferritic stainless steel fuel cladding tube and preparation method thereof

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preparation example Construction

[0047] On the other hand, an embodiment of the present invention provides a method for preparing a cladding tube, including: gas atomization pulverization→powder mechanical ball milling→powder suction and sealing→powder solidification molding→rod billet hot forging forming→pipe billet piercing forming → Multi-pass cold rolling + intermediate annealing → heat treatment to obtain the final desired structure.

[0048] Further, the pre-alloyed powder of ODS steel with the designed composition was prepared by gas atomization method. The particle size of the pre-alloyed powder obtained by gas atomization pulverization is ≤150 μm, and the protective atmosphere is high-purity argon with volume purity ≥99.99%.

[0049] Furthermore, in order to realize the alloying of the powder and the uniformity of the structure and composition of the material, the method of mechanical ball milling is adopted, and the process conditions of the mechanical ball milling of the powder are designed as foll...

Embodiment 1

[0059] In this example, the composition of the ODS steel for preparing the ferritic stainless steel fuel cladding tube is: Cr: 12.13%, W: 1.98%, Mn: 0.47%, V: 0.17%, Y 2 o 3 : 0.35%, Ti: 0.41%, C: 0.011%, N: 0.008%, Fe balance and impurities.

[0060] The preparation process is as follows:

[0061] (1) Gas atomization powder production: ODS steel alloy powder was prepared by gas atomization method, the atomization gas pressure was 4.0 MPa, and the protective atmosphere was argon gas with a volume purity of 99.99%.

[0062] (2) Powder mechanical ball milling: Atomized powder with a particle size of ≤150 μm was selected for mechanical ball milling. The ball milling atmosphere was argon gas with a volume purity of 99.99%, the mass ratio of balls to materials was 10:1, the ball milling time was 48 hours, and the rotational speed was 240 r / min.

[0063] (3) Powder pumping and sealing: keep warm at 300°C for 2 hours, and at the same time use a molecular pump to pump air until the ...

Embodiment 2

[0069] In this embodiment, the alloy composition of ODS steel is: Cr: 12.25%, W: 1.93%, Y 2 o 3 : 0.35%, Ti: 0.37, C: 0.01%, N: 0.012%; Fe balance and impurities.

[0070] The difference between the cladding tube preparation process and Example 1 is that it lacks the hot isostatic pressing solidification molding process, and the ball mill powder obtained through the air extraction and sealing process is directly prepared into a billet by hot forging. 1 is the same.

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Abstract

The invention discloses an ODS ferritic stainless steel fuel cladding tube and a preparation method thereof, the ODS ferritic stainless steel fuel cladding tube is made of ODS steel, and the ODS steel comprises the following components in percentage by weight: 11.0-14.0% of Cr, 1.0-3.0% of (W + Mo), 0.1-0.5% of Y2O3, 0.1-0.5% of Ti, 0-1.0% of Mn, 0-0.5% of V, and 1t of C; 0.02%, with the balance being Fe and impurities; and the content of nuclides with relatively large neutron absorption cross sections in the impurities meets the standard of a nuclear fuel cladding material. Alloy components of the ODS steel are reasonably designed, the machining process of the cladding pipe is controlled, and the obtained ODS steel pipe is good in surface quality and high in precision and straightness; the nano oxide is dispersed and distributed in the matrix, and the average size is about lt; the particle size is 10nm, and the number density is 1022-24/m < 3 >; the high-temperature tensile property of the pipe is excellent, and the tensile yield strength is gt at 800 DEG The pressure is 200 MPa; the high-temperature oxidation resistance is excellent.

Description

technical field [0001] The invention relates to the technical field of nuclear energy fuel cladding materials, in particular to an ODS ferritic stainless steel fuel cladding tube and a preparation method thereof. Background technique [0002] my country is actively deploying the medium and long-term development plan of advanced nuclear energy. Among them, the liquid metal cooled reactor has unique advantages in nuclear fuel transmutation and proliferation, high power density and long life, and is the main reactor type of the fourth-generation fission reactor system, mainly including nanocooled fast reactor (SFR), lead-cooled fast reactor (LFR) etc. [0003] In recent years, countries around the world have developed various conceptual schemes of small metal-cooled reactors, which are intended to be used in different applications and scenarios, such as remote inland, marine resource development, and aerospace power supply. The inlet temperature of these advanced reactors is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/28C22C38/04C22C38/24B22F5/12B22F9/08B22F9/04B22F3/15B22F3/17B22F3/18B22F3/24C21D9/08G21C3/07
CPCC22C38/22C22C38/28C22C38/04C22C38/24C22C32/0026B22F5/106B22F9/082B22F9/04B22F3/15B22F3/17B22F3/18B22F3/24C21D9/08G21C3/07B22F2009/044B22F2003/175B22F2003/248C21D2211/005Y02E30/30
Inventor 李垣明李艳芬段振刚李静高士鑫严伟李文杰熊良银柴晓明李权辛勇苏东川邱玺余红星黄永忠张宏亮
Owner NUCLEAR POWER INSTITUTE OF CHINA
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