A high temperature and corrosion resistant thermal spraying wire and its preparation method
A thermal spraying and corrosion-resistant technology, which is applied in the direction of coating, molten spraying, metal material coating process, etc., can solve the problems of boiler four-pipe corrosion and leakage, improve high-temperature corrosion resistance, reduce negative effects, and resist The effect of thermal shock
Active Publication Date: 2020-02-21
JIANGSU QIDI ALLOY +1
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Problems solved by technology
[0004] In order to solve the problem of leakage of four boiler tubes due to wear and corrosion, the invention discloses a high temperature and corrosion resistant thermal spraying wire and a preparation method thereof. The thermal spraying wire has wear resistance, high temperature and corrosion resistance and good resistance to sulfate corrosion
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Embodiment 1
[0032] A high temperature and corrosion resistant thermal spraying wire, the mass percentage of each component in the thermal spraying wire is: Cr: 45%, Ti: 3%, C: 0.25%, Fe: 0.38%, Mn: 0.8%, Si: 1%, and the rest are Ni and impurities. Among them, the impurities are: O: 0.02% or less, P: 0.05% or less, S: 0.01% or less.
[0033]The preparation method of the high temperature and corrosion resistant thermal spraying wire described above, the concrete steps are:
[0034] (1) In a mixed atmosphere of ammonia and argon, weigh the raw material components in proportion, melt them in the order of Ni, Cr, Ti, active elements and other components, keep them warm for 1-5 hours, and then cast them into alloy ingots ;
[0035] (2) Heating the alloy ingot to 1100-1200°C and forging it into a 50×50mm billet;
[0036] (3) Perform the first annealing treatment on the blank at 900°C-1000°C under the protection of argon;
[0037] (4) At 1100-1250°C, swage the billet on a swaging machine to fo...
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The invention belongs to the field of hot-spraying materials, and particularly relates to a high-temperature-resistant anti-corrosion spraying material and a preparation method thereof. The hot-spraying wire material is prepared from the components in percentage by mass: 45 to 49 percent of Cr, 2 to 3 percent of Ti, 0.05 to 0.3 percent of C, 0.1 to 5 percent of active elements, and the balance Niand impurities, wherein the content of the impurities is below 0.02 percent, the content of P is below 0.05 percent, the content of S is below 0.01, and the mass proportion of Ni / Cr is 0.9 to 1.1. According to the hot-spraying wire material provided by the invention, more Cr and Ni elements are contained, a stable austenite structure can be formed, and more alloy elements are subjected to solutiontreatment, so that the stability of a system is further improved; by adding the C, the high-temperature strength can be improved; by controlling the mass ratio of Ni / Cr to range from 0.9 to 1.1, theprocessability can be improved, and the hot-spraying wire material is easy to process and form; and during the preparation process, an active nitrogen atom pyrolyzed by ammonia gas, the Ti, the Si, the B and the like can form hard nitride, and a crystal boundary is pinned so as to prevent an austenite crystal from growing and deforming, so that the stability of the austenite is improved, and the high temperature corrosion resistance and the wear resistance are further improved.
Description
technical field [0001] The invention belongs to the field of thermal spraying materials, in particular to a high temperature and corrosion resistant thermal spraying wire material and a preparation method thereof. Background technique [0002] The four tubes of the boiler (water wall tubes, superheater tubes, reheater tubes and economizer tubes) cover all the heating surfaces of the boiler. They bear the pressure of the working fluid and some chemical components inside, and the high temperature outside. The environmental effects of erosion and wear, reconciled between water and fire, are where the contradictions converge, so failures and leaks are prone to problems. There are many leakage accidents of the four pipes, which not only pose a serious threat to the stable operation of the unit, affect the completion of power generation indicators and reduce economic benefits, but also directly affect the normal dispatch of the power grid. [0003] Fly ash wear and mechanical wea...
Claims
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IPC IPC(8): C22C19/05C22C27/06C22C30/00C22C1/02C22F1/02C22F1/10C22F1/16C23C4/06
CPCC22C1/02C22C1/023C22C19/052C22C19/058C22C27/06C22C30/00C22F1/02C22F1/10C22F1/16C23C4/06
Inventor 庄红芳杨晓波
Owner JIANGSU QIDI ALLOY