300 MW subcritical stator blade casting process

Abstract

The invention provides a 300 MW subcritical stator blade casting process. The casting process is characterized by, step 1, enabling a leading edge to face upwards and arranging a casting process scheme of a dead head; step 2, taking core assemble molding as the molding mode; step 3, baking all outer molds and cores before a casting is poured, wherein the baking temperature is 150-200 DEG C, and the heat preservation time is 4-5 hours; step 4, strengthening the slag collecting and deoxidizing processes of molten steel, wherein the tapping temperature is 1630-1640 DEG C, and the pouring temperature is 1580 + / -10 DEG C; and step 5, controlling the aluminum content in a finished product to be 0.015%-0.02%. The looseness defect can be effectively prevented, and meanwhile, the casting material utilization rate is improved, and the material cost and the processing cost are greatly reduced.

Description

technical field [0001] The invention relates to the field of casting technology of steam turbine blades, in particular to the casting technology of steam turbine stationary blades. Background technique [0002] As one of the core components of a steam turbine, the stationary blade plays an important role in the operation of the steam turbine. The shape of the static blade is complex, the requirements for processing equipment are high, the processing cost is expensive, and the production volume is extremely large. A unit needs at least several thousand blades of different sizes and specifications. In the highly competitive market environment of the power station steam turbine manufacturing industry, users have higher and higher requirements for the quality and performance of the stator blades. [0003] The main quality problems of A153 low-pressure 7-level static blades are: when the finished state of the static blades is tested by PT, there are single point-shaped air holes...

AI Technical Summary

Problems solved by technology

[0003] The main quality problems of A153 low-pressure 7-level static blades are: when the finished state of the static blades is tested by PT, there are single point-shaped air holes, inclusion defects, and irregular-shaped loose defects that exceed the standard in area and quantity

However, the adoption of this process scheme will bring about a dilemma that the utilization rate of casting materials will be greatly reduced, and the cost of materials and processing will be greatly increased.

Images