Gas inlet cylinder of gas turbine and manufacturing process thereof

Abstract

The invention relates to a special material of a gas inlet cylinder of an M251S type gas turbine and a manufacturing process thereof. The material comprises the following chemical components in percentage by weight: less than or equal to 0.25 percent of C, less than or equal to 0.60 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent S, less than or equal to 0.25 percent of Cr, less than or equal to 0.25 percent of Mo, less than or equal to 0.50 percent of Ni and less than or equal to 0.50 percent Cu. The invention has the advantages of developing the material conforming to the requirement of the gas inlet cylinder of the M251S type gas turbine, casting and molding a product conforming to the mechanical properties of the gas inlet cylinder of the gas turbine and filling the material blank of the product in China and abroad.

Description

technical field [0001] The invention relates to a special material and a manufacturing process for an intake cylinder of an M251S type gas turbine, belonging to the field of casting materials and process manufacturing. Background technique [0002] Foreign technical status: The castings used in the gas turbine provided by Mitsubishi Heavy Industries of Japan to Hangzhou Steam Turbine Co., Ltd. have serious shrinkage holes such as the retaining ring of the first-stage stationary vane during the finishing process, and the quality of the castings is difficult to meet the "GGC-0069 Gas Turbine Intake Cylinder". Ductile iron castings" and other standards stipulated requirements. Although the gas turbine intake cylinder produced by FCD450 material provided by Japan's Mitsubishi Heavy Industries basically meets the requirements of the "GGC-0069 Nodular Iron Castings for Gas Turbine Intake Cylinder" standard, the casting price is too expensive. [0003] Domestic technology status: ...

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Problems solved by technology

[0002] Foreign technical status: The castings used in the gas turbine provided by Mitsubishi Heavy Industries of Japan to Hangzhou Steam Turbine Co., Ltd. have serious shrinkage holes such as the retaining ring of the first-stage stationary vane during the finishing process, and the quality of the castings is difficult to meet the "GGC-0069 Gas Turbine Intake Cylinder". Ductile Iron Castings" and other standards stipulated requirements

Although the gas turbine intake cylinder produced with FCD450 material provided by Japan's Mitsubishi Heavy Industries basically meets the requirements stipulated in the "GGC-0069 Nodular Iron Castings for Gas Turbine Inlet Cylinder" standard, the casting price is too expensive

[0003] Domestic technology status: Although Ningxia Great Wall Suzaki (Sharing Group) has become the manufacturing center of gas turbine iron castings in China and even the world, due to the differences in similar castings, Ningxia Great Wall Suzaki (Sharing Group) has developed the M25IS model gas turbine cast iron The development of parts seems to be unable to do what one wants. A domestic company tried to produce three sets of intake cylinder castings using FCD450 materials. Although more than ten sets have been produced and tested in the past three years, no obvious results have been received so far.

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