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Method for forging Cr-Ni-Mo stainless steel blades

A technology of stainless steel and blades, which is applied in the direction of engine components, mechanical equipment, etc., can solve the problems of high temperature sensitivity of stainless steel, high deformation resistance, low production pass rate of blades, etc., and achieve the effect of improving production pass rate and reducing cracks

Inactive Publication Date: 2014-06-25
SHAANXI HONGYUAN AVIATION FORGING
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  • Abstract
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Problems solved by technology

The usual forging method is as follows: firstly, the bar is heated and free-forged into a barren shape, then the barren shape is air-cooled, ground and scratched, and then heated and forged through the overall mold, and then obtained for machining after air-cooling. However, due to the high temperature sensitivity of Cr-Ni-Mo stainless steel, it is easy to cause cracks when air-cooled; in addition, due to the high deformation resistance of the material and the large gap between the blade root and the blade blade cross-section As a result, it is difficult to completely fill the cavity of the mold when using the integral mold for die forging, so the production pass rate of the blade is low

Method used

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Embodiment Construction

[0010] The method of the present invention will be described in detail below through specific examples.

[0011] The rotor blade in a 1000MW supercritical steam turbine is made of 1Cr12Ni3Mo2VNbN material in Cr-Mo-V stainless steel. The size of the forging billet required for mechanical processing of the rotor blade is: length 1427.09mm, blade body chord width 298.00mm, The blade body profile thickness is 17.78mm-37.77mm, the blade root width is 391.61mm, and the blade root thickness is 80.36mm. According to this, a bar with a diameter of 220 mm and a length of 506 mm is heated and then free forged to form a barren shape; the barren shape after free forging is slowly cooled in an incubator, that is, the temperature of the incubator is raised to 200 ° C to preheat and then free forged Afterwards, put the waste directly into the box and cool slowly to room temperature; then, send the waste that has cooled to room temperature to the heat treatment workshop, and ensure that stress...

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Abstract

The invention discloses a method for forging Cr-Ni-Mo stainless steel blades, relates to the field of technologies for forging blades, and particularly relates to the technical field of technologies for forging Cr-Ni-Mo stainless steel blades. The method has the advantages that air cooling implemented after free forging and die forging are completed is adjusted on the basis of the original forging process and is replaced by slow cooling implemented by the aid of heat-insulation cotton or heat-insulation tanks, a forged crude shape is added, stress relief annealing implemented after die forging is completed is additionally carried out, integral die forging for the crude shape is adjusted and is replaced by a die forging process including integral die forging and sectional die forging, accordingly, cracks of the Cr-Ni-Mo stainless steel blades are reduced in forging procedures, a cavity of a die can be completely filled with the forged crude shape during die forging, and the production qualified rate of forged piece blanks for manufacturing the blades can be increased.

Description

technical field [0001] The invention relates to the technical field of forging blades, in particular to the technical field of forging Cr-Ni-Mo stainless steel blades. Background technique [0002] A 1000MW supercritical steam turbine includes stator blades and corresponding rotor blades, wherein the rotor blades are made of Cr-Ni-Mo stainless steel. The manufacture of the rotor blades is firstly made of a blank for machining by forging a bar, and then machining it. The usual forging method is as follows: firstly, the bar is heated and free-forged into a barren shape, then the barren shape is air-cooled, ground and scratched, and then heated and forged through the overall mold, and then obtained for machining after air-cooling. However, due to the high temperature sensitivity of Cr-Ni-Mo stainless steel, it is easy to cause cracks when air-cooled; in addition, due to the high deformation resistance of the material and the large gap between the blade root and the blade blade...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K3/04
Inventor 魏蕴玥郭长勇史原惠斌李增乐
Owner SHAANXI HONGYUAN AVIATION FORGING
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