Leaf ring forging and its manufacturing process
A production process and ring forging technology, which is applied in the field of leaf ring forgings and its production process, can solve the problems of low tensile strength and yield strength, coarse grains, and difficulty in meeting the requirements of use, so as to achieve uniform structure and improve shape , good high temperature durability and mechanical properties at room temperature
Active Publication Date: 2015-11-18
WUXI PAIKE HEAVY CASTING & FORGING
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- Application Information
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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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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0108] The first step: prepare materials;
[0109] The second step: blank forging, including heating, forging, and annealing. The heating temperature is 1230°C. The forging method combined with upsetting and drawing is adopted during forging. The total forging ratio is 8. After forging, it is annealed at 720°C×8h and combined with furnace cool to room temperature;
[0110] The third step: blanking, cutting off the head and tail of the ingot;
[0111] 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, and after rolling, anneal at 720°C×8h and furnace cool to room temperature;
[0112] The fifth step: heat treatment, including normalizing, tempering for the first time, quenching, tempering for the second time, and tempering for the third time;
[0113] In the normalizing process, the normalizing temperature is 1110°C, hold for 5 hours, the cooling method is ...
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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. Higher requirements, and the impeller as the core component of the steam turbine unit, whether its high temperature performance can meet the requirements of use 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 requ...
Claims
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IPC IPC(8): C22C38/60C22C38/54C21D8/00B23P15/02
Inventor 刘智
Owner WUXI PAIKE HEAVY CASTING & FORGING