Turbine wicket gate double-refining casting technique

A casting process and water turbine technology, applied in the field of manufacturing process of high-performance water turbine movable guide vanes, can solve problems such as affecting the operating life and economic benefits of the water turbine, difficult to meet high-performance indicators, unstable internal quality of products, etc. The effect of dendrite refinement and high metal utilization rate

Active Publication Date: 2009-06-10
SHENYANG RES INST OF FOUNDRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although high-quality molten steel is provided for casting production through external refining technology (AOD or VOD), but "three-point smelting, seven-point casting", sand castings inevitably produce casting defects such as porosity, shrinkage cavities, and inclusions, which make the internal

Method used

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  • Turbine wicket gate double-refining casting technique

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Effect test

Embodiment 1

[0051] The ZG06Cr13Ni4Mo consumable electrode was prepared by the AOD (VOD) refining process, and then the secondary refining was carried out by the electroslag casting process, and the double refining guide vane casting I of the hydraulic turbine was cast.

[0052] 1. Prepare ZG06Cr13Ni4Mo consumable electrode.

[0053] The raw materials are: pure iron, ferrosilicon, ferromolybdenum, low carbon ferrochrome, ferromanganese, nickel plate, scrap steel, scrap stainless steel.

[0054] First, the AOD refining process is used to prepare raw materials for self-consumption. The above-mentioned raw materials are sent to an intermediate frequency induction arc furnace for melting, and then blown by the AOD refining furnace for decarburization and reduction reactions. In the decarburization period, the blowing argon-oxygen ratio is 1:4, and the mixed gas with the argon-oxygen ratio of 1:4 is blown into the molten steel from the spray gun to oxidize and decarburize the molten steel. % ~...

Embodiment 2

[0067] The ZG06Cr13Ni4Mo consumable electrode was prepared by the AOD (VOD) refining process, and then the secondary refining was carried out by the electroslag casting process, and the double-refined stainless steel movable guide vane casting II of the hydraulic turbine was cast.

[0068] 1. Preparation of ZG06Cr13Ni4Mo consumable electrode

[0069] The raw materials are: pure iron, ferrosilicon, ferromolybdenum, low carbon ferrochrome, ferromanganese, nickel plate, scrap steel, scrap stainless steel.

[0070] First, the AOD refining process is used to prepare raw materials for self-consumption. The above-mentioned raw materials are sent to an intermediate frequency induction arc furnace for melting, and then blown by the AOD refining furnace for decarburization and reduction reactions. In the decarburization period, the blowing argon-oxygen ratio is 1:4, and the mixed gas with the argon-oxygen ratio of 1:4 is blown into the molten steel from the spray gun to oxidize and deca...

Embodiment 3

[0083] The ZG06Cr13Ni4Mo consumable electrode was prepared by the AOD (VOD) refining process, and then the secondary refining was carried out by the electroslag casting process, and the double-refined stainless steel movable guide vane casting III of the water turbine was cast.

[0084] 1. Preparation of ZG06Cr13Ni4Mo consumable electrode

[0085] The raw materials are: pure iron, ferrosilicon, ferromolybdenum, low carbon ferrochrome, ferromanganese, nickel plate, scrap steel, scrap stainless steel.

[0086] First, the AOD refining process is used to prepare raw materials for self-consumption. The above-mentioned raw materials are sent to an intermediate frequency induction arc furnace for melting, and then blown by the AOD refining furnace for decarburization and reduction reactions. In the decarburization period, the blowing argon-oxygen ratio is 1:4, and the mixed gas with the argon-oxygen ratio of 1:4 is blown into the molten steel from the spray gun to oxidize and decarbu...

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Abstract

The invention provides a hydraulic turbine guiding blade double refining casting process, which adopts an AOD or VOD refining method to prepare a raw material consumable electrode, and the weight percentages of chemical compositions of the prepared raw material consumable electrode are : C is less than or equal to 0.05 percent, Si is less than or equal to 0.6 percent, Mn is less than or equal to 0.58 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.03 percent, Cr is between 11.5 and 13.5 percent, Ni is between 3.5 and 5.0 percent, Mo is between 0.4 and 1.0 percent, W is less than or equal to 0.5 percent, O is less than or equal to 0.008 percent, H is less than or equal to 0.00035 percent and the balance is Fe. Then a prepared consumable plate is made into a hydraulic turbine stainless guiding blade component by an electroslag smelting casting method; and the double refining casting process can refine and purify steel liquid completely and effectively so as to remove the gas and non-metallic inclusions in steel greatly. The crystal structure of the casting is uniform and compact, and has low sulfur and phosphorus content, less non-metallic inclusions, higher toughness, anti-fatigue performance and good welding performance.

Description

technical field [0001] The invention relates to a double-refining casting process for a water turbine guide vane, in particular to a manufacturing process for a high-performance water turbine movable guide vane. Background technique [0002] With the development of water turbines towards high efficiency and large scale, some large and medium-sized hydropower stations in my country have been developed and constructed one after another, and the quality requirements for the movable guide vanes, which are important parts of water turbines, are getting higher and higher. At the same time, due to the high sediment content of rivers in our country, the quality and performance requirements for guide vanes of large-scale unit flow components are higher. In addition to having high mechanical properties, it also needs to have anti-fatigue, anti-cavitation performance and certain corrosion resistance. The low-carbon martensitic stainless steel material with higher strength and toughnes...

Claims

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Application Information

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IPC IPC(8): B22D23/10C21C7/04C21C7/072C21D9/00C21D1/18C22C38/44
Inventor 娄延春李宝东蒋国森姜云飞陈瑞王大威孙铁军王安国张家东
Owner SHENYANG RES INST OF FOUNDRY
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