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Material of final-stage blade of combined cycle steam turbine
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A last-stage blade, combined cycle technology, applied in the direction of blade support elements, mechanical equipment, engine components, etc., can solve the problems of difficult processing and high cost, and achieve the effect of simplifying the processing process, improving the service life and reducing the production cost.
Inactive Publication Date: 2020-11-03
HARBIN TURBINE
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Problems solved by technology
[0003] The purpose of the present invention is to provide a material for the final stage blade of the combined cycle steam turbine in order to solve the problems of high cost and difficult processing of the existing combined cycle steam turbine final stage blade material
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specific Embodiment approach 1
[0013] Specific Embodiment 1: In this embodiment, a material for the last stage blade of a combined cycle steam turbine is composed of C: 0.10% to 0.17%, Mn: 0.65% to 1.05%, Si: 0.10% to 0.35%, Cr : 11.25%~12.75%, Ni: 2.25%~3.25%, Mo: 1.50%~2.00%, V: 0.25%~0.40%, N: 0.020%~0.045%, Al: ≤0.025%, Cu: ≤0.50% , Sn: ≤0.05%, W: ≤0.10%, Ti: ≤0.05%, P: ≤0.020%, S: ≤0.015%, and the balance is Fe.
[0014] In this embodiment, P and S are impurity elements.
specific Embodiment approach 2
[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that it consists of C: 0.10%, Mn: 0.65%, Si: 0.10%, Cr: 12.75%, Ni: 2.25%, Mo: 1.50%, V: 0.25%, N: 0.020%, Al: 0.020%, Cu: 0.10%, Sn: 0.02%, Ti: 0.01%, P: 0.020%, S: 0.015%, and the balance is Fe. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0016] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that it consists of C: 0.17%, Mn: 1.05%, Si: 0.35%, Cr: 11.25%, Ni: 3.25%, Mo: 2.00%, V: 0.40%, N: 0.045%, Al: 0.005%, Cu: 0.40%, W: 0.10%, Ti: 0.04%, P: 0.020%, S: 0.008%, and the balance is Fe. Others are the same as in the first embodiment.
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Abstract
The invention relates to a material of a final-stage blade of a combined cyclesteam turbine. The material solves the problems that an existing material of the final-stage blade of the combined cyclesteam turbine is high in cost and difficult to machine. The material is composed of C, Mn, Si, Cr, Ni, Mo, V, N, Al, Cu, Sn, W, Ti, P, S and the balance Fe. The material of the final-stage blade of the combined cyclesteam turbine has better comprehensive mechanical properties and higher strength indexes, can be further expanded to be used for a final-stage long blade (1400 mm or above) and is a material for the final-stage long blade of a high-parameter thermal power steam turbine; and the high hardness shows good wear resistance and water erosion resistance, so that the machining process issimplified, meanwhile, the unit production cost is reduced, and the service life of the last-stage blade is prolonged. The material is suitable for the material of the final-stage blade of the combined cycleturbine of a heavy-duty gas turbine.
Description
technical field [0001] The invention relates to a material for the last stage blade of a combined cycle steam turbine. Background technique [0002] Heavy-duty gas turbines are known as the "Pearl in the Crown" of the equipment manufacturing industry. They have the advantages of high power generation efficiency, less land occupation, and less pollution. They have become one of the main development directions of the power industry in the future. At present, the domestic OEMs are competing to develop the object. The final blade is one of the main components of the combined cycle steam turbine, which directly affects the working efficiency of the unit. Due to the large centrifugal force and steam erosion, stainless steel with high chromium and high alloy elements (such as 15% Cr or 17% Cr high alloying element stainless steel Cr 15 Ni 7 Cu 2 MoNbVN or Cr 17 Ni 4 Cu 4 Nb, etc.) or titaniumalloy preparation (such as TC 4 etc.), and the use of cemented carbide sheets or s...
Claims
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Application Information
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