Welding rod special for nuclear power 20-control chrome steel

An electrode and chromium steel technology is applied in the field of special welding materials for nuclear power 20 chromium steel, which can solve the problems of low chromium content and can not meet the welding requirements of 20 chromium steel, and achieve the effect of improving the anti-FAC performance and ensuring the quality.

Active Publication Date: 2015-06-17
中广核工程有限公司 +1
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Problems solved by technology

It can be seen from Table 3 that the chromium content in the deposited metal of the E5015 electrode is very small, which cannot meet the welding requirements of 20-controlled chromium steel

Method used

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  • Welding rod special for nuclear power 20-control chrome steel
  • Welding rod special for nuclear power 20-control chrome steel
  • Welding rod special for nuclear power 20-control chrome steel

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Embodiment Construction

[0022] In order to make the purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0023] In order to cooperate with the 20-control chromium steel, the inventor has obtained the design values ​​of the chemical composition, mechanical properties, core wire chemical composition and coating formula of the deposited metal of the special welding rod for nuclear power 20-control chromium steel of the present invention after many experiments, such as Table 4-7 shows.

[0024] Table 4. The design value of the chemical composition of the deposited metal of the special electrode for 20-control chromium steel / wt%

[0025]

[0026] Tabl...

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Abstract

The invention discloses a welding rod special for nuclear power 20-control chrome steel. The content of each element in deposited metal of the welding rod comprises: <=0.15wt% of C, <=0.75wt% of Si, <=1.60wt% of Mn, <=0.020wt% of P, <=0.020wt% of S, <=0.30wt% of Ni, 0.17-0.30wt% of Cr, <=0.30wt% of Mo, and <=0.20wt% of Cu. Compared with the prior art, the chemical components of the deposited metal of the welding rod special for the nuclear power 20-control chrome steel are close to those of the nuclear power 20-control chrome steel, mechanical property is better than an existing E5015 welding rod or equal to the existing E5015 welding rod, and therefore anti-FAC performance of a 20-control chrome steel welding line finished by the welding rod is improved notably, the quality of the 20-control chrome steel welding line of a nuclear power station is ensured in the process of operation, and the welding rod special for the nuclear power 20-control chrome steel has important significance to safe operation of a nuclear power unit.

Description

technical field [0001] The invention relates to a special welding material for nuclear power 20-control chromium steel, in particular to a special welding electrode for 20-control chromium steel that can significantly reduce the corrosion rate of FAC. Background technique [0002] The medium flow rate in the delivery pipe of the nuclear power plant is high and the flow rate is large (about 1.7 to 1.9 times that of thermal power), which will cause the phenomenon of "fluid accelerated corrosion (FAC)" caused by the high flow rate of steam and water, that is, carbon steel pipe The internal surface is washed by a large amount of high-speed flowing steam, and the protective oxide film on the inner wall falls off and becomes thinner, which makes the steel matrix worse and the annual corrosion rate increases. When the fluid accelerated corrosion phenomenon is serious, it may cause a pipe burst accident, so it is necessary to improve the anti-steam erosion performance of the deliver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/365
Inventor 李予卫钟华惠维山邓天红陈仁华
Owner 中广核工程有限公司
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