Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine

Abstract

The invention relates to the field of metal processing, in particular to a method for improving the stress etching resistance of a monobloc forging low-pressure rotor of a nuclear turbine. The method for improving the stress etching resistance of the monobloc forging low-pressure rotor of the nuclear turbine includes the following steps of: heating a rotor material 30Cr2Ni4MoV to austenite temperature, cooling and tempering; wherein, the austenite temperature is between 830 and 860 DEG C; and the tempering temperature is between 565 and 670 DEG C. After the material is heated to the austenite temperature, the material is cooled by water for leading the yield strength to be lower than 760MPa. As the technical solution is adopted, the yield strength of the monobloc forging low-pressure rotor of the nuclear turbine achieves a certain index below 760MPa, which not only can meet the stress loading condition of the nuclear rotor, but also can meet the condition of stress etching resistance.

Description

technical field [0001] The invention relates to the field of metal treatment, in particular to a method for improving the stress corrosion resistance performance of a whole forged low-pressure rotor of a nuclear power steam turbine. Background technique [0002] Metal heat treatment is a process in which metal workpieces are heated to a suitable temperature in a certain medium, and after being kept at this temperature for a certain period of time, they are cooled at different rates. Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing techniques, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but changes the microstructure inside the workpiece or changes the chemical composition of the workpiece surface. , to give or improve the performance of the workpiece. It is characterized by improving the intrinsic quality of the workpiece, which is generally not visibl...

AI Technical Summary

Problems solved by technology

The rotor is an important part of a nuclear power steam turbine, which is subjected to complex stress and the working environment is wet steam. The rotor processed by the above-mentioned existing heat treatment process will cause stress corrosion cracking accidents, which will affect the service life of the nuclear power rotor and the safety of the nuclear power steam turbine.

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