Electric melting molding method of nuclear power conventional island low-pressure rotor

Abstract

The invention provides an electric melting molding method of a nuclear power conventional island low-pressure rotor, which includes the following procedures: using high energy heat sources which is composited by electric arc heat, resistance heat and electro slag heat to fuse raw metal wire materials transported continuously, solidifying and accumulating the base materials layer by layer to mold and to make rotor components; using computers to control relative move of the electric melting heads and the base materials, thus achieving that a molten pool cools quickly on the base materials and solidifies and accumulates layer by layer, and finally accumulating the molded rotor components layer by layer. The material of the rotor is 30Cr2Ni4MoV, the content of C in the raw metal wire materials used for preparing electric melting is 0.20-0.28 %, the content of C in the materials made by electric melting is 0.10-0.18 % and the grain size is 7-10 levels. The electric melting molding method of a nuclear power conventional island low-pressure rotor has the advantages of high efficiency, low costs and good mechanical properties.

Description

technical field [0001] The invention relates to an electrofusion forming method for a nuclear power conventional island low-voltage rotor. Background technique [0002] The 30Cr2Ni4MoV material has the advantages of high hardenability, good comprehensive mechanical properties, and good thermal processing technology, so it is widely used in the production of low-pressure rotors for nuclear power steam turbines. However, this kind of steel is essentially coarse-grained steel, which has strong genetic characteristics, and is prone to coarse grains and mixed crystals, which has caused great difficulties in material manufacturing. [0003] At present, the preparation of rotor steel materials is mainly realized by smelting and casting steel ingots, forging and forming, and then multiple times of normalizing heat treatment. This process refines the grains and obtains material components with good plastic toughness mechanical properties and high temperature properties. In actual pr...

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Problems solved by technology

[0004] Although this process is used to produce the rotor steel material without exception, due to the complex operation (including rotor steel material research and development, pure steel smelting research and development, forging process research and development, heat treatment process research and development, etc.), the control of chemical and mechanical properties is difficult. , resulting in inhomogeneous material phase structure and even stress cracking during heat treatment

In addition, the utilization rate of forged structural materials is low and the cycle is long, which also leads to relatively high manufacturing costs and low efficiency; and due to my country's own technical level, the quality stability of the manufactured material components is poor, and the scrap rate is high, resulting in serious delays in the project. cause great waste

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