Solder wire special for nuclear power 20-control chrome steel

A technology of welding wire and chromium steel, which is applied in the field of special welding materials for nuclear power 20-control chromium steel, can solve the problems of poor fluidity of the molten pool, unfavorable welding quality, and high requirements for welders' operation level, so as to achieve the effect of ensuring quality and improving FAC resistance performance

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

In the actual welding construction, it is also found that when using CHW-40CNH welding wire to weld 20 chrome steel, the fluidity of the molten pool is poor, similar to stainless steel welding wire, which requires a high level of welder operation, which is not conducive to improving the welding quality

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  • Solder wire special for nuclear power 20-control chrome steel
  • Solder wire special for nuclear power 20-control chrome steel
  • Solder wire special for nuclear power 20-control chrome steel

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Embodiment Construction

[0020] In order to make the purpose of the invention, the technical solution and its beneficial technical effects 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.

[0021] In order to cooperate with the 20-control chromium steel, the inventor has obtained the chemical composition of the special welding wire for the nuclear power 20-control chromium steel of the present invention, the chemical composition of the deposited metal of the welding wire (the balance is Fe) and the design value of mechanical properties through many experiments. As shown in Table 4-6.

[0022] Table 4. Design value of chemical composition of special welding wire for 20-chrome steel / wt%

[0023] grade

C

Si

mn

...

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Abstract

The invention discloses a solder wire special for nuclear power 20-control chrome steel. The solder wire comprises the following chemical component: 0.05-0.1wt% of C, 0.7-1.0wt% of Si, 1-1.5wt% of Mn, <=0.02wt% of P, <=0.02wt% of S, <=0.15wt% of Ni, 0.22-0.33wt% of Cr, <=0.15wt% of Mo, and <=0.4wt% of Cu. Compared with the prior art, the chemical components of deposited metal of the solder wire special for the nuclear power 20-control chrome steel are close to those of the 20-control chrome steel, mechanical property is better than an existing CHW-40CNH solder wire or equal to the existing CHW-40CNH solder wire, and therefore anti-FAC performance of a 20-control chrome steel welding line finished by the solder wire 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 solder wire 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 wire 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 delivery pip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
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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