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Radiation-resistant martensite heat-resistant steel having excellent compatibility with Pb and Pb-Bi

A compatibility and martensitic technology, applied in the field of radiation-resistant martensitic heat-resistant steel with good compatibility with Pb and Pb-Bi, can solve the problem that heat-resistant steel cannot meet high temperature resistance and radiation resistance at the same time Lead corrosion and other problems, to achieve excellent high temperature mechanical properties, reduce the amount of precipitation, improve the effect of radiation resistance

Active Publication Date: 2013-02-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a radiation-resistant martensitic heat-resistant steel with good compatibility with Pb and Pb-Bi, and to adjust and optimize the composition on the basis of traditional 9-12Cr martensitic heat-resistant steel to solve the problem of Existing martensitic heat-resistant steel cannot meet the problems of high temperature resistance, radiation resistance and lead corrosion resistance at the same time

Method used

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  • Radiation-resistant martensite heat-resistant steel having excellent compatibility with Pb and Pb-Bi
  • Radiation-resistant martensite heat-resistant steel having excellent compatibility with Pb and Pb-Bi
  • Radiation-resistant martensite heat-resistant steel having excellent compatibility with Pb and Pb-Bi

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Embodiment 1

[0045] Table 1 shows a steel grade whose element content is within the scope of the present invention and another commercial heat-resistant steel P91 whose element content is not within the scope of the present invention. The two steel grades were tested for oxidation and lead corrosion respectively after the final heat treatment. As shown in Figure 2(a)-(b), the new steel grade 1 and the commercial P91 are both typical martensitic structures. Through the results of the two oxidation experiments, it is demonstrated that the present invention proposes to use the high Si content and Cr to work together to improve the oxidation resistance of the material, thereby improving the correctness of its lead corrosion resistance.

[0046] Both steels were oxidized for 400 hours at 450°C and 550°C in the atmosphere, and their oxidation conditions were observed. Such as image 3 As shown in (a)-(d), after 400 hours of oxidation, the density and smoothness of the oxide film formed by steel...

Embodiment 2

[0052] Table 2 shows the composition comparison between the new steel grade 2 and EP823. EP823 did not consider the reasonable matching of the C+N content and the strong carbonitride forming elements Nb and V in the design, resulting in the formation of As shown in Figure 6(a), the massive precipitates with too high precipitation temperature will cause cracks to easily initiate in these large precipitates, which will affect their mechanical properties. However, the new martensitic heat-resistant steel of the present invention has Reasonably matching the content of C + N and the content of strong carbonitride forming elements Ta and V as shown in Fig. 6(b) shows that the massive precipitates formed during the solidification process were successfully eliminated.

[0053] Also due to the high Si content in the newly invented steel, it has good lead corrosion resistance. As shown in Fig. The corrosion layer of steel type 2 is much thinner than that of P91, and the substrate is wel...

Embodiment 3

[0057] Table 3 has provided the composition of another kind of new steel type 3 within the scope of the present invention; This steel type obtains tempered martensitic structure after normalizing and tempering, fine M 23 C 6 And MX-type carbonitrides are distributed on the martensite lath boundary and the original austenite grain boundary. Such as Figure 8 As shown, these carbonitrides are uniformly distributed and mainly located at high-energy interfaces. These precipitated phases can effectively pin dislocations and these high-energy interfaces during high-temperature deformation. The lead corrosion resistance of this steel is also excellent. Figure 9(a)-(b) is the result of corrosion of new steel 3 and P91 in Pb-Bi at 450°C for 400h. It can be seen that compared with P91, the new steel has obvious advantages.

[0058] Table 3 New steel grade 3 composition

[0059] the element

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Abstract

The invention belongs to the technical field of heat-resistant alloy, and specifically relates to radiation-resistant martensite heat-resistant steel having excellent compatibility with Pb and Pb-Bi. The steel comprises the components in weight percentage: 0.05-0.2% of C, 9.0-12.0% of Cr, 1.0-3.0% of Si, 0.3-3.0% of Mn, 1.0-3.0% of W, 0.1-0.4% of V, 0.03-0.3% of Ta, 0.03-0.15% of N, less than or equal to 0.05% of Al, less than or equal to 0.05% of Ti and the balance of Fe. According to the invention, the content of Si is increased; part of C element is replaced by N; the precipitation of Cr23C6 is reduced so as to ensure the Cr content in matrix, so that a rich Si compact oxide film is formed on the surface when the material serves in the Pb and Pb-Bi under high temperature, and a structure is protected to be free of lead corrosion; activating elements Mo, Ni and Nb are replaced by W, Mn and Ta, so that the low activation is ensured, and the irradiation resistance performance is improved; the types and appearance of the precipitated phase can be controlled according to a reasonable proportion between the C+N content and V+Ta content, so as to ensure the high-temperature performance in the serving process; and the novel martensite heat-resistant steel which serves under a strong radiation condition and has high-temperature resistance, lead corrosion resistance and irradiation resistance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant alloys, in particular a new type of horse with excellent resistance to lead corrosion, radiation resistance, high-temperature durability and creep, which is suitable for serving in high temperature, strong radiation and liquid Pb-Bi corrosion environments. Tensitic heat-resistant steel, which is a radiation-resistant martensitic heat-resistant steel with good compatibility with Pb and Pb-Bi, is mainly used in the manufacture of accelerator-driven subcritical systems (ADS) and fourth-generation nuclear power lead-cooled fast Heap of structural parts. Background technique [0002] Energy is the fuel of economic development and the driving force of economic development. Rapid economic development means rapid increase in energy demand, but existing fossil fuels are difficult to meet the energy demand of rapid economic development; nuclear power, as a clean and efficient energy source, It will ...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C38/34C22C38/38
Inventor 叶中飞王培李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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