Thermal ageing assessment method of cast austenitic stainless steel of CPR1000 nuclear power plant

A technology of austenitic stainless steel and heat aging, which is applied in the direction of material inspection products, test metals, etc., can solve the problems of material fracture toughness decline, heat aging embrittlement, etc., and achieve the effect of improving safety and reliability

Inactive Publication Date: 2015-07-15
SUZHOU NUCLEAR POWER RES INST +2
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Problems solved by technology

[0002] CPR1000 nuclear power plant primary circuit main pipeline, main pump casing, some valve bodies, etc. are made of cast austenitic stainless steel materials. Research at home and abroad shows that the phenomenon

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  • Thermal ageing assessment method of cast austenitic stainless steel of CPR1000 nuclear power plant
  • Thermal ageing assessment method of cast austenitic stainless steel of CPR1000 nuclear power plant
  • Thermal ageing assessment method of cast austenitic stainless steel of CPR1000 nuclear power plant

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Embodiment Construction

[0020] Preferred embodiments of the present invention will be described in detail below.

[0021] The thermal aging evaluation method of CPR1000 nuclear power plant casting austenitic stainless steel of the present invention, it comprises the following steps:

[0022] (a) Take the austenitic stainless steel on the equipment / components in the CPR1000 nuclear power plant for elemental analysis, and calculate the equivalent chromium content Cr eq and ferrite content δ c , to evaluate the thermal aging sensitivity of austenitic stainless steel;

[0023] Specifically: (a1) Take the austenitic stainless steel on the equipment / parts of the CPR1000 nuclear power plant for elemental analysis, determine the mass content of Cr, Mo, Si, Ni, Mn, N and C, and use each element in the calculation formula The symbol indicates its mass content;

[0024] (a2) Use formula 1 to calculate the equivalent chromium content Cr eq , Using formula 2 to calculate the equivalent nickel content Ni eq ,...

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Abstract

The invention relates to a thermal ageing assessment method of cast austenitic stainless steel of a CPR1000 nuclear power plant. The method comprises the following steps: (a) analyzing the elements of the austenitic stainless steel, and calculating the equivalent chromium content Creq and ferrite content deltac; (b) checking the casting manner and the material mark of the austenitic stainless steel; (c) calculating indoor-temperature Charp impact absorption energy Cv; (d) calculating a breaking tenacity value J1C and a breaking tenacity value Jd when the crack depth is 2.5mm; (e) determining the thermal ageing state of the austenite austenitic stainless steel according to the calculated indoor-temperature Charp impact absorption energy Cv, the breaking tenacity value J1C and the breaking tenacity value Jd when the crack depth is 2.5mm. The thermal ageing sensitivity and the thermal ageing state of the austenitic stainless steel can be assessed and judged by testing the mass content of the specific elements in the austenitic stainless steel based on the casting manner and the material mark; as a result, the problem that the breaking tenacity of the stainless steel cannot be judged in the operation process of the corresponding equipment/part of the CPR1000 nuclear power plant is solved, and a key way is provided for improving the safety of the power plant.

Description

technical field [0001] The invention relates to a thermal aging evaluation method for stainless steel, in particular to a thermal aging evaluation method for cast austenitic stainless steel in a CPR1000 nuclear power plant. Background technique [0002] CPR1000 nuclear power plant primary circuit main pipeline, main pump casing, some valve bodies, etc. are made of cast austenitic stainless steel materials. Research at home and abroad shows that the phenomenon of thermal aging and embrittlement of cast austenitic stainless steel will occur after long-term operation. Typical The effect is that the fracture toughness of the material decreases with increasing operating time. The decrease in fracture toughness will threaten the safety and structural integrity of thermal aging-sensitive equipment, so it is necessary to study a method capable of thermal aging assessment of CPR1000 cast austenitic stainless steel, so as to maintain the structure of thermal aging-related equipment i...

Claims

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Application Information

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IPC IPC(8): G01N33/20
Inventor 姜家旺汪小龙郭文海薛飞遆文新史芳杰余伟炜韩传伟
Owner SUZHOU NUCLEAR POWER RES INST
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