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Nickel-based alloy of nuclear power steam generator

A technology of steam generator and nickel-based alloy, applied in metallurgy field, can solve the problems of high price and high cost of steam generator, achieve the effects of improving alloy performance, enhancing high temperature oxidation resistance and corrosion resistance, and reducing alloy cost

Inactive Publication Date: 2010-06-23
江苏龙鑫特殊钢实业总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current nuclear power market, American Incone1600 alloy is generally used as the main raw material. This material has good corrosion resistance and high tensile strength, which can fully meet the requirements of the 60-year design life of new nuclear power construction projects, but the price is very expensive. At around 1800 yuan, making the cost of the steam generator very high

Method used

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  • Nickel-based alloy of nuclear power steam generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A nickel-based alloy for steam generators used in nuclear power, its main components and weight percentages are: Ni: 64.8%, Cr: 19.5%, Si: 0.80%, C: 0.080%, Mn: 1.20%, RE: 0.22 %, Cu: 0.50%, Ti: 0.800%, Co: 0.10%, B: 0%, Fe: 12.0%.

[0009] Its production process is:

[0010] 1. Intermediate frequency melting:

[0011] 1.1 Preparation of raw materials: including charge, slag and deoxidizer, the charge is Ni, Cr, Fe and Mn materials, the slag is calcium agent (such as lime, fluorite), and the deoxidizer is aluminum agent (such as Aluminum lime powder), standby after baking;

[0012] 1.2 Charging: Load Ni, Cr and Fe furnace materials that have been baked in step 1.1 into the intermediate frequency melting furnace, and adjust the fluidity of the slag in time to make it good after the furnace materials are melted;

[0013] 1.3 Refining: low-power chemical material, after the material is melted by 70%, add 3% of the total amount of slag, (slag system ratio: lime: fluorite...

Embodiment 2

[0071] The same as the nickel-based alloy for nuclear power steam generators in Example 1, the difference is that the weight percentages of each component are Ni: 72.0%, Cr: 16.8%, Si: 0.50%, C: 0.10%, Mn: 0% , RE: 0.08%, Cu: 0%, Ti: 0.519%, Co: 0%, B: 0.001%, Fe: 10.0%.

Embodiment 3

[0073] A nickel-based alloy for nuclear power steam generators as in Example 1, the difference is that the weight percentages of each component are: Ni: 77.5%, Cr: 14.0%, Si: 0.20%, C: 0.495%, Mn : 0.61%, RE: 0.14%, Cu: 0.30%, Ti: 0.150%, Co: 0.05%, B: 0.0005%, Fe: 7.0%.

[0074] performance test table

[0075] Test items

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Abstract

The invention relates to a nickel-based alloy of a nuclear power steam generator. The invention can maintain or increase the alloy performance while reducing the alloy cost. The specific scheme of the invention is as follows: 1. a defined amount of rare earth elements are added in steel to have purification and metamorphism functions of deoxidizing, desulfurizing, changing the shape of inclusion and the like, have microalloy function in the alloy and finally increase the oxidation resistance, high temperature strength and plasticity, fatigue life, corrosion resistance, crack resistance and the like of the steel; 2. in view of the production cost, the content of the precious element nickel is needed to be as low as the lower limit under the premise of ensuring the processability and ensuring that the alloy can form the desired metallographic structure; 3. the content of chromium element is increased properly so as to increase the high temperature oxidation resistance and corrosion resistance of alloy; 4. the content of silicon element is adjusted so as to increase the tensile strength and corrosion resistance of alloy while the plasticity of alloy is ensured; and 5. the content of carbon is controlled and titanium element is added at the same time so as to further increase the oxidation resistance and corrosion resistance of steel.

Description

technical field [0001] The invention relates to a metal, in particular to an alloy, in particular to a nickel-based alloy for steam generators used in nuclear power, and belongs to the technical field of metallurgy. Background technique [0002] Nickel-based alloys for nuclear power steam generators are used as one of the main raw materials for heat transfer tubes, pillars, brackets, and anti-vibration strips in steam generators. Their performance directly affects the service life of steam generators. Once damaged, the boiler generator, as a non-replaceable part, restricts or greatly affects the life of the nuclear power plant. In the past, nickel-based alloy materials were provided by foreign companies. For China's nuclear power, which has developed rapidly in recent years, it is extremely important to unify the main body of operation, reactor type, and technology. The main content is to promote the localization of nuclear power equipment. Therefore, the research and develo...

Claims

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Application Information

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IPC IPC(8): C22C19/05
Inventor 王国年
Owner 江苏龙鑫特殊钢实业总公司
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