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Alloying method for improving liquid lead and bismuth corrosion resistance of high-performance fastener for lead-based reactor

A technology of corrosion performance and fasteners, applied in the direction of nuclear power generation, climate sustainability, reduction of greenhouse gases, etc., can solve the problem of lack of reference and reference, and achieve the effect of improving the corrosion resistance of liquid lead and bismuth

Pending Publication Date: 2022-06-03
CHINA INSTITUTE OF ATOMIC ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most important thing is that it must have excellent corrosion resistance to liquid lead and bismuth, but the difficulty is that there are no reference and reference steel grades at home and abroad

Method used

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  • Alloying method for improving liquid lead and bismuth corrosion resistance of high-performance fastener for lead-based reactor
  • Alloying method for improving liquid lead and bismuth corrosion resistance of high-performance fastener for lead-based reactor
  • Alloying method for improving liquid lead and bismuth corrosion resistance of high-performance fastener for lead-based reactor

Examples

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Effect test

Embodiment 1

[0063] Example 1 (316)

[0064] By weight percentage, the chemical composition of the fastener material is: C: 0.022%; Si: 0.34%; Mn: 1.36%; S: 0.023%; P: 0.03%; Cr: 18.24%; Ni: 12.36%; Mo: 2.53%; N: 0.12%; Fe balance.

[0065] Example 1 is a 316-type austenitic stainless steel, the structure is a single austenite structure, and the Cr and Ni equivalent formulas claimed in the present invention are not applicable to this component.

Embodiment 2

[0067] By weight percentage, the chemical composition of the fastener material is: C: 0.055%; Si: 1.57%; Mn: 0.43%; S: 0.0017%; P: 0.009%; Cr: 14.55%; Ni: 9.5%; Mo: 0.05%; Nb: 0.68%; O: 0.002%; N: 0.005%; Fe balance. Among them, the Cr equivalent is 17.30<20, and the Ni equivalent is 11.37≯14.

Embodiment 3

[0069] By weight percentage, the chemical composition of the fastener material is: C: 0.052%; Si: 1.51%; Mn: 1.50%; S: 0.0015%; P: 0.009%; Cr: 13.6%; Ni: 12.2%; Mo: 0.05%; Nb: 0.70%; O: 0.002%; N: 0.006%; Fe balance. Among them, the Cr equivalent is 16.2714.

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Abstract

The invention belongs to the field of metal corrosion protection, and particularly relates to an alloying method for improving liquid lead and bismuth corrosion resistance of a high-performance fastener for a lead-based reactor. By weight percentage, C accounts for 0.03%-0.15%; 1.0 to 4.0% of Si; mn: 0 to 2.0%; 0 to 0.005 percent of S; 0 to 0.01% of P; cr: 12.0 to 18.0%; ni: 7.0 to 15.0%; 0 to 2.0 percent of Cu; nb: 8 * 100 C to 1.0%; 0 to 0.003 percent of O; 0 to 0.03 percent of N; and the balance of Fe. On the basis of the chemical components, one or more elements of Si, Mo, W and Nb with high oxidation resistance are added, an oxide barrier is formed on the surface of the material, and liquid lead and bismuth are prevented from entering. The technical barrier that an austenitic stainless steel material for an existing fastener does not have the liquid lead and bismuth corrosion resistance can be broken through, and the liquid lead and bismuth corrosion resistance of the fastener for the lead-based reactor is achieved and improved.

Description

technical field [0001] The invention belongs to the field of metal corrosion protection, and in particular relates to an alloying method for improving the corrosion resistance of austenitic stainless steel materials of high-performance fasteners for lead-based stacks to liquid lead and bismuth. Background technique [0002] Lead (lead-bismuth) cooled nuclear reactor, referred to as lead-based reactor, is one of the six types of fourth-generation nuclear reactors. Lead-based reactors can well meet the requirements of safety, economy, sustainability and nuclear non-proliferation, and are one of the key reactor types developed internationally. Due to the harsh internal environment of the lead-based reactor, the structural materials are not only subjected to high temperature, stress, and irradiation environment during service, but also face strong corrosion of liquid metal. The existing conventional materials cannot be directly used to meet the long-term service requirements. T...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/42C22C38/58C22C38/04C22C38/02C22C38/34C21D8/06
CPCC22C38/48C22C38/42C22C38/58C22C38/04C22C38/02C22C38/34C21D8/065C21D2211/001Y02E30/30
Inventor 徐海涛严伟燕春光史显波庄毅单以银秦博戎利建杨红义李依依
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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