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R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof

A pressure vessel and nuclear technology, applied in the field of steel for pressure vessels, can solve problems such as difficulty in ensuring uniformity and stability of structure and performance on large sections, and achieve excellent uniformity and stability of structure and performance, suitable strength The effect of toughness matching

Inactive Publication Date: 2009-07-08
CENT IRON & STEEL RES INST
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Problems solved by technology

[0007] With the increasing size of forgings (such as when the cross-sectional size is greater than 500mm), A508-III steel will face some limitations of its own and it is difficult to ensure the uniformity and stability of the microstructure and properties on the large cross-section

Method used

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  • R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof
  • R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof
  • R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof

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Embodiment Construction

[0035] A 25kg vacuum induction furnace was used to smelt 14 heats of test steel. The test steel was based on 508-4N steel, and the influence of key chemical composition changes on performance was studied within its composition range. For this reason, 14 heat test steels were designed to study the influence of Si, Cr, Ni, and Mo elements on the properties of steel when they were at the upper, middle and lower limits and the upper limit of B added to the test steel. Table 2 shows the chemical composition analysis results of 14 heats of test steel smelted. When the ingot is billeted, the ingot heating temperature is 1200°C, the initial forging temperature is 1150°C, the final forging temperature should be higher than 900°C, anneal at 650°C for 2 hours after forging, and air cool.

[0036] Table 2 Chemical composition of 14 heat test steels

[0037]

[0038] Using Gleeble3500 thermal testing machine to measure the continuous cooling curve of test steel as follows image 3 As ...

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Abstract

The invention provides a R17Cr1Ni3Mo steel for nuclear pressure containers and pertains to the technical field of steel for pressure containers.The steel comprises the following components by weight percentage: carbon of 0.13-0.20%, silicon of 0.15-0.30%, manganese of 0.20-0.40%, vanadium <=0.02%, nickel 3.00-3.95%, chromium 1.50-1.90%, molybdenum 0.48-0.65%, phosphorus <=0.008%, sulphur <=0.008%, cuprum <=0.05%, boron <=0.0010, and Fe of the rest.The steel is a novel improved steel developed by optimizing components, adding elements, optimizing thermal treatment technique on the basis of 508-4N steel. The steel of the invention has advantages of good hardenability and obdurability adaptation and excellent low-temperature flexibility. The produced R17Cr1Ni3Mo steel has a more excellent obdurability adaptation than the 508-4N steel, and the metallographic structure of the entire cross-section of the forgeable piece having a maximum cross-section smaller than 100mm is the tempering bainite structure.

Description

technical field [0001] The invention belongs to the technical field of steel for pressure vessels, and in particular provides R17Cr1Ni3Mo steel for nuclear pressure vessels and a preparation method thereof. The invention relates to the optimal chemical composition range and optimal heat treatment process selection of steel for nuclear pressure vessels, and is suitable for the manufacture of reactor pressure vessels and evaporator tube sheets of large nuclear power plants and nuclear submarines. Background technique [0002] The reactor pressure vessel (Reactor Pressure Vessel) and the evaporator tube sheet are the core components of a large pressurized water reactor. With the further increase of electricity demand and the increasing pressure of energy conservation and emission reduction, nuclear power has become a relatively mature clean energy. All countries in the world, especially China, are planning the construction plan of nuclear power units in the future. A developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D6/00C21D1/18
Inventor 刘正东林肇杰李昌义杨钢程世长王立民王宝忠张文辉于兆卿
Owner CENT IRON & STEEL RES INST
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