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Alloy-coated boiler component

A boiler parts and covering technology, applied in steam boiler accessories, steam boiler components, steam boilers, etc., can solve the problems of high material and labor costs, complex deformation, difficult use of auxiliary components, etc., to achieve durability and corrosion resistance. Excellent properties, good thermal shock resistance and impact resistance

Inactive Publication Date: 2014-12-24
DAI ICHI HIGH FREQUENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above treatment requires special ordering of protective materials with excellent corrosion resistance (such as aluminum oxide) or needs to be embedded in a narrow boiler, so material and labor costs are high and materials need to be purchased in advance
[0008] Next, for the case of the boiler furnace panel, it is a composite structure formed by alternately matching pipes and plates as mentioned above. Due to its large size (for example, 0.5m×6m), it is equivalent to the practical auxiliary components of the above-mentioned protective materials. It is more difficult to use, and there is a problem of complicated deformation accompanying the melting treatment after thermal spraying (for example, refer to Patent Document 2 and Patent Document 3)

Method used

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Embodiment Construction

[0071] Hereinafter, the boiler part of this invention is demonstrated in detail.

[0072] The boiler part of the present invention is an alloy-coated boiler part in which a metal base material is coated (coated) with an alloy material mainly composed of Ni-Cr and welded at an end.

[0073] In the boiler part of the present invention, the alloy material (self-fluxing alloy) constituting the cladding is different in the end region and the non-end region of the base metal.

[0074]

[0075] Here, the "end region" is a region including the end (welded part) and the vicinity of the end, and is a region where the temperature rises rapidly as the end is welded. The range of the end region varies depending on the shape of the base metal (form of the boiler part), etc.

[0076] For example, for a boiler tube, the area covered between the end and a position 15 to 500 mm away from the end can be regarded as the end area.

[0077] In addition, for the boiler furnace panel formed by al...

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Abstract

Provided is an alloy-coated boiler component which is to be welded at an end thereof, wherein a melted coating (15) with a first alloy material comprising not less than 1.5 % and not more than 2.5 % of B, not less than 3.5 % and not more than 4.0 % of Si, not more than 0.4 % of C, and not less than 12.0 % and not more than 17.0 % of Cr, and the balance being Ni and incidental impurities, is applied to the metallic base material on an end region including the end and its proximity and, a melted coating (16) of a second alloy material comprising more than 2.5 % and not more than 4.0 % of B, more than 4.0 % and not more than 5.0 % of Si, not less than 0.5 % and not more than 0.9 % of C, and not less than 12.0 % and not more than 17.0 % of Cr, and the balance being Ni and incidental impurities, is applied to the metallic base material on a non-end region other than the end region (percentages are expressed in terms of mass percentages). This alloy-coated boiler component has melted coatings which can be formed by thermal spraying-fusing treatment on the whole area of the metallic base material and the melted coating formed on the end region is superior in thermal shock resistance and resistance to shock.

Description

technical field [0001] The present invention relates to pipe members (hereinafter referred to as "boiler tubes") constituting heat transfer piping in various boilers, and plate-pipe composite panels (hereinafter referred to as "boiler furnace panels") constituting furnace shells with cooling channels, etc. Boiler components, and more particularly boiler components having an alloy coating for increased durability and suitable for welded construction. Background technique [0002] First of all, if the boiler tube is taken as an example, the working temperature of the boiler is lower than in the past and the erosion and corrosion environment in the furnace are not so serious. Characteristics of boiler steel pipes (low alloy steel pipes). In addition, for applications requiring corrosion resistance, stainless steel tubes are used, and titanium tubes are also used, but they are not widely used because they are expensive. [0003] In recent years, there has been an increase in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06B23K9/00B23K9/028B23K9/23B23K35/30C22C19/05F22B37/04
CPCB23K35/36B23K35/304C23C4/065C22C19/05B23K9/0282F22B37/04B23K35/30B23K2201/06C22C19/058B23K2101/06C23C4/067
Inventor 松原洋一曾地义信竹屋昭宏
Owner DAI ICHI HIGH FREQUENCY
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