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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, it 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, improve corrosion ability, improve the effect of radiation resistance

Active Publication Date: 2014-07-02
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 one steel grade with an element content within the scope of the present invention and another commercial heat-resistant steel P91 with an element content not within the scope of the present invention. The two steel grades were subjected to oxidation and lead corrosion experiments respectively after the final heat treatment. As shown in Fig. 2(a)-(b), both the new steel grade 1 and commercial P91 have typical martensitic structures. Through the results of the two oxidation experiments, it is demonstrated that the high content of Si and Cr proposed by the present invention are used 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 h at 450 ℃ and 550 ℃ in atmospheric environment, and their oxidation conditions were observed. like image 3 As shown in (a)-(d), after 400h of oxidation, the compactness and smoothness of the oxide film forme...

Embodiment 2

[0052] Table 2 shows the composition comparison of new steel grade 2 and EP823. EP823 did not consider the reasonable matching of C+N content and strong carbonitride forming elements Nb and V in the design, resulting in the formation of As shown in Fig. 6(a), the massive precipitation phase with too high precipitation temperature causes cracks to be easily initiated in these large precipitation phases, which affects its mechanical properties. The new martensitic heat-resistant steel of the present invention is due to Reasonably matching the content of C+N and the content of strong carbonitride-forming elements Ta and V, as shown in Fig. 6(b), the massive precipitates formed during solidification 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. 7(a)-(b), after immersing in the Pb-Bi eutectic alloy at The corrosion layer of steel grade 2 is obviously much thinner than that ...

Embodiment 3

[0057] Table 3 gives the composition of another new steel grade 3 within the scope of the present invention; this steel grade obtains tempered martensitic structure after normalizing and tempering, fine M 23 C 6 and MX-type carbonitrides are distributed on the martensitic lath boundaries and prior austenite grain boundaries. like Figure 8 As shown, these carbonitrides are uniformly distributed and mainly located at high-energy interfaces, and these precipitates can effectively pin dislocations and these high-energy interfaces during high temperature deformation. The lead corrosion resistance of this steel is also excellent. Figures 9(a)-(b) are the results of corrosion of new steel 3 and P91 in Pb-Bi for 400 h at 450 °C. It can be seen that compared with P91, the new steel species have obvious advantages.

[0058] Table 3 New steel grades 3 components

[0059] 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 to a new type of horse with excellent lead corrosion resistance, radiation resistance, high temperature durability and creep ability suitable for service in high temperature, strong irradiation and liquid Pb-Bi corrosion environment Astenitic heat-resistant steel, it is a radiation-resistant martensitic heat-resistant steel with good compatibility with Pb and Pb-Bi, mainly used in the manufacture of accelerator-driven subcritical systems (ADS) and fourth-generation nuclear power lead cooling fast Structural parts of the heap. Background technique [0002] Energy is the fuel for economic development and the traction 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; and nuclear power, as a clean and efficient energy source, It w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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