Manufacture method of steel ingot for million multikilowatt nuclear electricity pile core component

A manufacturing method and nuclear power stack technology, applied in the field of steel ingot manufacturing, can solve the problems of inability to meet large austenitic stainless steel forgings and unsatisfactory physical and chemical properties, and achieve strong resistance to neutron radiation embrittlement sensitivity, excellent high temperature resistance and Corrosion resistance, high purity effect

Active Publication Date: 2009-04-01
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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Problems solved by technology

However, the physical and chemical properties of steel ingots produced by general manufacturing methods cannot meet the requirements of nuc

Method used

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  • Manufacture method of steel ingot for million multikilowatt nuclear electricity pile core component
  • Manufacture method of steel ingot for million multikilowatt nuclear electricity pile core component
  • Manufacture method of steel ingot for million multikilowatt nuclear electricity pile core component

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Embodiment Construction

[0026] The invention adopts the electroslag remelting method to manufacture steel ingots for nuclear power reactor core components of the million-kilowatt class. According to the requirements of relevant nuclear power technical specifications, the steel ingots used for large austenitic stainless steel forgings for million-kilowatt nuclear power reactor core components must meet the requirements of Z3CN18-10NS materials, that is, the physical and chemical properties should meet the following indicators:

[0027] 1. The chemical composition should meet the indicators in Table 1:

[0028] element Melting analysis (%) Analysis value of finished product (%) C ≤0.038 ≤0.040 Cr 18.50～20.00 18.50～20.00 Ni 9.00～11.00 9.00～11.00 Si ≤1.00 ≤1.00 mn ≤2.00 ≤2.00 S ≤0.015 ≤0.020 P ≤0.030 ≤0.035 Cu ≤1.00 ≤1.00 co ≤0.06 ≤0.10 N ≤0.080 ≤0.080 B ≤0.0018 ≤0.0018

[0029] Table 1

[0030] 2. The mechanical pro...

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Abstract

The invention discloses a method for manufacturing a steel ingot used for million-kilowatt nuclear power reactor core structural component, austenitic stainless steel ingot that weighs over 25 tons is manufactured by electroslag remelting process: firstly, preparation: a single-phase bipolar series connected or triphase bipolar series connected electroslag remelting furnace is adopted; a copper wall water-cooling crystallizer and a water-cooled base plate are adopted; a consumable electrode is assembled; slag charge is matched; SiGa and Al powder are adopted for deoxidation; secondly, refinement and fusion casting: a graphite electrode is picked up and replaced by the consumable electrode to remelt the fully melted slag charge after slagging and slugging. When the actual weight of the steel ingot is 2 tons less than the preset weight, the electric power is reduced and feeding operation in telophase is carried out; thirdly, the steel ingot is stripped. The steel ingot manufactured by the invention has extremely high purity, extremely fine uniformity, excellent high temperature resistance and tarnish resistance, as well as strong anti neutron radiation embrittlement sensibility.

Description

technical field [0001] The invention relates to a method for manufacturing a steel ingot, in particular to a method for manufacturing a steel ingot for a million-kilowatt nuclear power reactor core component. Background technique [0002] The core components of mega-kilowatt nuclear power plants are large austenitic stainless steel forgings, which are the heart components that affect the life of nuclear reactors. Each set of million-kilowatt-level nuclear power core includes five components, namely the upper support flange, upper support plate, basket flange, core support plate and outlet nozzle, with a total delivery weight of more than 100 tons. Because it has been working continuously for decades without being replaced, everything must be ensured to ensure that each forging has the same service life under the same conditions, and the entire core component can be used for 70 years. During the operation of nuclear power plants, core stainless steel forgings not only need t...

Claims

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Application Information

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IPC IPC(8): B22D23/10
Inventor 朱孝渭周天煜花小龙向大林王克武
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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