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CN-121976134-A - Aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion and preparation method and application thereof

CN121976134ACN 121976134 ACN121976134 ACN 121976134ACN-121976134-A

Abstract

The invention relates to the technical field of special alloy materials, in particular to aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion, and a preparation method and application thereof. The aluminum-containing austenitic steel comprises, by weight, 8% -30% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities. The preparation method comprises the steps of batching, smelting, homogenizing annealing, forging, hot working and final annealing. The aluminum-containing austenitic steel material provided by the invention can form a continuous and compact Al-rich oxide film when in service in a high-temperature liquid lead-based alloy environment, improves the corrosion resistance of the high-temperature liquid lead-based alloy of stainless steel, can meet the requirement of the high-temperature liquid lead-based alloy environment, and remarkably improves the corrosion resistance in the high-temperature liquid lead-based alloy compared with the traditional 316 austenitic stainless steel.

Inventors

  • GAO JUN
  • DENG PING
  • ZHAO YONGFU
  • Jiang e
  • LAN ZHIKE
  • ZHUO WENBIN

Assignees

  • 中国核动力研究设计院

Dates

Publication Date
20260505
Application Date
20260120

Claims (10)

  1. 1. The aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion is characterized by comprising, by weight, 8% -30% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities.
  2. 2. The high-temperature-resistant liquid metal corrosion-containing austenitic steel according to claim 1, wherein the high-temperature-resistant liquid metal corrosion-containing austenitic steel comprises, by weight, 8% -15% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities.
  3. 3. The high-temperature-resistant liquid metal corrosion-containing austenitic steel according to claim 1, wherein the high-temperature-resistant liquid metal corrosion-containing austenitic steel comprises, by weight, 15% -19% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities.
  4. 4. The high-temperature-resistant liquid metal corrosion-containing austenitic steel according to claim 1, wherein the high-temperature-resistant liquid metal corrosion-containing austenitic steel comprises, by weight, 19% -30% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities.
  5. 5. The high-temperature liquid metal corrosion resistant aluminum-containing austenitic steel according to any one of claims 1 to 4, wherein the high-temperature liquid metal corrosion resistant aluminum-containing austenitic steel further comprises, in weight percentage, si < 0.5%, mn < 3%, and/or the total amount of other trace alloying elements < 0.5%.
  6. 6. A preparation method of aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion is characterized by comprising the following steps of preparing raw materials in percentage by weight according to the chemical components in any one of claims 1 to 5, smelting, vacuum smelting in a vacuum smelting furnace to prepare an alloy ingot, homogenizing annealing, forging after removing oxide skin on the surface of the ingot after homogenizing annealing, obtaining a blank, hot working, heat working after removing oxide skin on the surface of the blank, obtaining a plate or bar, and final annealing, namely carrying out solid solution treatment and water quenching on the material after heat working, thus obtaining the aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion.
  7. 7. The method according to claim 6, wherein the homogenizing annealing is performed at a temperature of 1000 ℃ to 1100 ℃ for a time of 24 hours to 96 hours.
  8. 8. The method according to claim 6, wherein the forging temperature is 1100-1150 ℃, and the hot working temperature is 1100-1150 ℃.
  9. 9. The method according to claim 6, wherein the final annealing is performed at 1100 ℃ to 1200 ℃ for 1h to 5h.
  10. 10. Use of the high temperature liquid metal corrosion resistant aluminum containing austenitic steel according to any of claims 1 to 5 as lead cooled fast reactor structural material in a liquid lead-based alloy environment at 400 ℃ to 600 ℃.

Description

Aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion and preparation method and application thereof Technical Field The invention relates to the technical field of special alloy materials, in particular to aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion, and a preparation method and application thereof. Background The lead-cooled fast reactor using liquid lead-base alloy as coolant is one of the most promising reactor types in the fourth generation advanced nuclear energy system, and has important application prospect in the fields of commercial reactors, special reactors and the like because of the advantages of high inherent safety, compact system structure, long service life, good economic performance and the like. Under the scouring action of high-temperature, high-flow-rate and high-density liquid metal, the structural material is subjected to corrosion damage in the form of dissolution corrosion, oxidation corrosion, local corrosion, scouring corrosion, corrosive wear and the like, so that the operation reliability and service life of key equipment such as pipelines, steam generators, internal components of stacks, fuel cladding, circulating pumps and the like are directly affected, and corrosion product films are possibly peeled off to seriously threaten the safe, stable and economic operation of the lead-cooled fast reactor. Therefore, the problem of material corrosion in the high temperature liquid lead-based alloy environment is one of the key problems limiting the development and application of lead cooled fast reactor technology. Since the concept of lead cooled fast reactors was proposed, a great deal of material corrosion behavior and mechanism research has been developed internationally, trying to screen out suitable structural materials and finding methods for slowing down material corrosion, so as to meet the design and construction requirements of research stacks at present and commercial stacks in the future. From the technical maturity and construction cost point of view, the current international main lead-cooled fast reactor project design scheme still regards austenitic stainless steel (316L, 15-15Ti, 316Ti, etc.) and ferritic/martensitic stainless steel (T91, HT9, EP823, etc.) as the preferred structural materials. For the above materials, a great deal of liquid lead-base alloy corrosion test research is carried out internationally, the temperature is covered in a 300 oC-650o C interval, the time is from 100h to 15000h, the oxygen concentration is from 10 -12 wt% to oxygen saturation, the flowing state comprises static state and dynamic state (0 m/s-3 m/s), a great deal of reference data is accumulated, and the related research finds that in a high-temperature liquid lead-base alloy environment, austenitic stainless steel has the dissolution corrosion problem caused by the selective dissolution of Ni and the lead element permeation is serious, and ferrite/martensitic stainless steel has serious oxidation corrosion and the following oxide film peeling problem. Therefore, the traditional candidate materials are difficult to meet the use requirement of engineering long-term service, and research and development of novel materials capable of forming stable and compact oxide films in high-temperature liquid lead-based alloy environments are urgently needed, so that the compatibility of the materials in the high-temperature liquid lead-based alloy environments is improved. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art or related art. According to the first aspect of the invention, the aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion comprises, by weight, 8% -30% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities. Further, the high-temperature liquid metal corrosion resistant aluminum-containing austenitic steel comprises, by weight, 8% -15% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities. Further, the high-temperature liquid metal corrosion resistant aluminum-containing austenitic steel comprises, by weight, 15-19% of Ni, 13-20% of Cr, 2-8% of Al, 0.2-2% of Nb, 0.02-0.2% of C, fe and other unavoidable impurities. Further, the high-temperature liquid metal corrosion resistant aluminum-containing austenitic steel comprises, by weight, 19% -30% of Ni, 13% -20% of Cr, 2% -8% of Al, 0.2% -2% of Nb, 0.02% -0.2% of C, fe and other unavoidable impurities. Further, the chemical components of the aluminum-containing austenitic steel resistant to high-temperature liquid metal corrosion comprise less than or equal to 0.5% of Si, less than or equal to 3% of Mn and/or less than or equal to 0.5% of the total amount of other trace alloy elements in percentage by weight. The invention provides a pr