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Blade ring forged piece and fabrication technology thereof

A manufacturing process and ring forging technology, applied in the field of blade ring forgings and their manufacturing processes, can solve the problems of difficulty in meeting use requirements, low tensile strength and yield strength, coarse grains, etc., so as to improve shaping and uniform structure. , the effect of refining the microstructure

Active Publication Date: 2014-05-07
WUXI PAIKE HEAVY CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-temperature ferritic stainless steel has good high-temperature corrosion resistance and high-temperature durability, but generally the grains are relatively coarse, the tensile strength and yield strength are low, and it is difficult to meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] The first step: prepare materials;

[0132] The second step: billet forging, including heating, forging, and annealing, the heating temperature is 1230°C, the forging method combined with upsetting, drawing and lengthening is adopted during forging, the total forging ratio is 8, and after forging, annealing is carried out at 720°C×8h and furnace is combined cool to room temperature;

[0133] The third step: blanking, cutting off the head and tail of the ingot;

[0134] The fourth step: forming forging, including heating, billet making, ring rolling, and annealing; the heating temperature is 1180°C, the final forging temperature is 950°C, annealing at 720°C×8h after rolling and furnace cooling to room temperature;

[0135] The fifth step: heat treatment, including normalizing, tempering for the first time, quenching, tempering for the second time, and tempering for the third time;

[0136] In the normalizing process, the normalizing temperature is 1110°C, hold for 5 ho...

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PUM

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Abstract

The invention relates to a blade ring forged piece and a fabrication technology thereof. The fabrication technology comprises the following steps: 1, preparing materials; 2, cogging and forging, including heating, forging, and annealing; 3, baiting, and removing head and tail of a steel ingot; 4, molding and forging, including heating, forming, rolling and annealing; 5, carrying out thermal treatment, including normalizing, tempering for the first time, quenching, tempering for the second time, and tempering for the third time; 6, carrying out ultrasonic flaw detection; 7, carrying out physical and chemical testing; 8, carrying out finish machining; 9, packaging products. Thus, the blade ring forged piece obtains a good fine grain microstructure and high-temperature endurance property, and simultaneously has good tensile strength and yield strength.

Description

technical field [0001] The invention relates to the technical field of forging processing technology, in particular to a leaf ring forging made of high-temperature ferritic stainless steel and a manufacturing process thereof. Background technique [0002] At present, the temperature parameters of the supercritical generating units that have been built are mostly around 550°C, while the working temperature of the new generation of supercritical generating units under design is 620°C. High requirements, and the impeller as the core component of the steam turbine, whether its high temperature performance can meet the use requirements is related to the success or failure of the new generation of steam turbines. High-temperature ferritic stainless steel has good high-temperature corrosion resistance and high-temperature durability, but generally the grains are relatively coarse, and the tensile strength and yield strength are low, which is difficult to meet the use requirements. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/54C21D8/00B23P15/02
Inventor 刘智
Owner WUXI PAIKE HEAVY CASTING & FORGING
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