Forging forming method of Hastelloy 230 alloy flange forge piece
By performing forging deformation and precise temperature-controlled heat treatment on a 5000-ton press, the casting defects and metal flow problems of Hastelloy 230 alloy flange forgings were solved, and high-quality forging production was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI XINMIN DONGTAI HEAVY FORGING
- Filing Date
- 2025-12-29
- Publication Date
- 2026-05-05
AI Technical Summary
When producing Hastelloy 230 alloy flange forgings using traditional processes, casting defects such as porosity, shrinkage cavities, and slag inclusions are prone to occur. Furthermore, the poor fluidity of the metal during the forging process affects the stability of product quality.
A 5000-ton press is used for forging and deformation, with the initial forging temperature controlled at ≥1160℃ and the final forging temperature at ≥1000℃. Combined with multi-point contact thermocouples for precise temperature control and heat treatment, performance and non-destructive testing are carried out, and finally, the material is precision machined using specialized machining equipment.
It significantly reduces internal defects in forgings, improves microstructure, enhances product quality stability, and avoids problems such as grain coarsening and uneven microstructure.
Smart Images
Figure CN121972591A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-temperature alloy forging technology, and in particular to a forging method for Hastelloy 230 alloy flange forgings. Background Technology
[0002] Hastelloy 230 is a typical nickel-chromium-tungsten-molybdenum high-temperature alloy with a long-term operating temperature of up to 1150℃. It exhibits excellent creep resistance, oxidation resistance, and corrosion resistance in high-temperature environments, effectively resisting the erosion of high-temperature media containing halogens, oxides, and other corrosive impurities. Therefore, it is widely used in high-end components such as flange connections in engine combustion chambers and turbine casings in the aerospace field, as well as flanges for high-temperature media transport pipelines in fourth-generation nuclear power high-temperature gas-cooled reactors and tower solar thermal power generation systems. These flange components must withstand complex conditions such as long-term high-temperature gas erosion, frequent thermal cycling, and vibration loads, requiring stringent structural density and performance stability. Cast or welded components are prone to sealing failure or structural fracture due to internal porosity, cracks, and other defects. Forging is necessary to achieve a "densified" structure, improve grain boundary bonding, and ensure service reliability.
[0003] The existing double vacuum smelting process of "vacuum induction furnace + vacuum arc furnace" has reduced the content of harmful elements such as sulfur and phosphorus in the alloy and solved the problem of "hot brittleness" of the alloy. At the same time, the "step heating + multi-pass die forging + isothermal forging" process has been developed to overcome the forming problem of large-size flanges above DN600. Ultrasonic flaw detection, penetrant testing and other full-process testing methods have been introduced to ensure the basic quality of forgings.
[0004] However, due to its high alloy content, high resistance to high-temperature deformation, and narrow hot working window, Hastelloy 230 alloy is prone to casting defects such as porosity, shrinkage cavities, and slag inclusions when produced using traditional processes. Furthermore, its poor metal fluidity during forging can easily lead to forming defects such as cold shuts and incomplete pouring, affecting the stability of product quality. Summary of the Invention
[0005] The purpose of this invention is to provide a forging method for Hastelloy 230 alloy flange forgings, which aims to solve the technical problems that in traditional production processes, ingots are prone to casting defects such as porosity, shrinkage cavities, and slag inclusions, and the poor metal fluidity during forging process easily leads to forming defects such as cold shuts and incomplete pouring, which affect the stability of product quality.
[0006] To achieve the above objectives, the present invention employs a forging method for Hastelloy 230 alloy flange forgings, comprising the following steps: The treated Hastelloy 230 alloy ingot was forged and deformed on a 5000-ton press to obtain shaped forgings, with a total forging ratio of 3.7, and the initial forging temperature was controlled at ≥1160℃ and the final forging temperature was controlled at ≥1000℃. The formed forgings are sent into the furnace for heat treatment, and the temperature is precisely controlled by multi-point contact thermocouples throughout the process. Performance and non-destructive testing are performed on the heat-treated forgings; Specialized machining equipment is used to process the qualified forgings, and the dimensional accuracy of the forgings meets the requirements of the finished product drawings.
[0007] In the process of forging and deforming the treated Hastelloy 230 alloy ingot on a 5000-ton press to obtain shaped forgings, the total forging ratio is 3.7, and the initial forging temperature is controlled at ≥1160℃ and the final forging temperature is controlled at ≥1000℃: The steel ingot is free-forged into a billet, the surface is lightly tapped and the two ends are riveted and upset, and the billet is blanked to obtain a billet with a specification of Ф340mm*850mm; The billet is heated to 1180℃ and held for more than 1 hour. After being taken out of the furnace, it is upturned to 420mm and then drawn into Ф340mm*850mm to refine the grains. The billet is heated to 1182℃ and held for more than 1 hour. After being taken out of the furnace, it is upturned to 400mm, drawn and rolled into a round drum-shaped billet of Ф450mm*490mm. The round drum-shaped billet is heated to 1165℃ and held for more than 1.5 hours. The round head is inserted into a special stencil for upsetting, hole expansion and shaping and size adjustment. During the forging process, the single-sided reduction is not less than 50mm to ensure that the billet is forged through.
[0008] In the process of sending the formed forging into the furnace for heat treatment, the temperature is precisely controlled throughout using multi-point contact thermocouples: The forged parts are placed in the furnace at ≤600℃, heated to 700~1000℃ and held, then heated to 1080~1240℃ and held for ≥30 minutes. After being taken out of the furnace, the solution heat treatment is completed by water cooling.
[0009] Among the steps involved in the performance and non-destructive testing of heat-treated forgings: Samples were taken according to the product's technical requirements for testing of mechanical properties, metallographic structure, and chemical composition. Ultrasonic testing, visual inspection, and penetrant testing are performed on forgings to ensure that they are free of record-level defects.
[0010] Among the steps involving sampling and testing mechanical properties, metallographic structure, and chemical composition according to product technical requirements: The mechanical properties of the forgings shall meet the following requirements: at 22℃, Rp0.2≥300MPa, Rm≥750MPa, elongation after fracture≥30%, KV2>45J; at 500℃, Rp0.2≥220MPa, Rm≥680MPa, elongation after fracture≥30%; at 700℃, Rp0.2≥200MPa, Rm≥420MPa, elongation after fracture≥30%, and grain size≥2.5 grade.
[0011] This invention discloses a forging method for Hastelloy 230 alloy flange forgings, comprising the following steps: Forging and deforming a treated Hastelloy 230 alloy ingot on a 5000-ton press to obtain a shaped forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled at ≥1160℃, and the final forging temperature is controlled at ≥1000℃; the shaped forging is then sent to a furnace for heat treatment, with precise temperature control throughout using multi-point contact thermocouples; the heat-treated forging undergoes performance and non-destructive testing; the qualified forging is processed using specialized machining equipment, ensuring that the dimensional accuracy of the forging meets the requirements of the finished product drawings; through the above method, internal defects in the forging are reduced, significantly reducing casting defects such as porosity, shrinkage cavities, and slag inclusions, improving the internal microstructure of the forging, avoiding problems such as grain coarsening and uneven microstructure, and improving the stability of product quality. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a flowchart of the forging method for the Hastelloy 230 alloy flange forging of the present invention.
[0014] Figure 2 This is a flowchart of steps S100 of the present invention.
[0015] Figure 3 This is a flowchart of steps S300 of the present invention.
[0016] Figure 4 This is a product process flow diagram of the present invention.
[0017] Figure 5 This is a schematic diagram of the forging deformation process of the present invention.
[0018] Figure 6 This is a diagram showing the chemical composition of the steel ingot of this invention.
[0019] Figure 7 This is a heat treatment process curve diagram of the present invention. Detailed Implementation
[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.
[0021] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0022] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."
[0023] Please see Figures 1-7 This invention provides a forging method for Hastelloy 230 alloy flange forgings, comprising the following steps: S100: The processed Hastelloy 230 alloy ingot is forged and deformed on a 5000-ton press to obtain a shaped forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled at ≥1160℃, and the final forging temperature is controlled at ≥1000℃.
[0024] In this embodiment, the processed Hastelloy 230 alloy ingot is forged and deformed on a 5000-ton press to obtain a shaped forging. The total forging ratio is 3.7, the initial forging temperature is controlled at ≥1160℃, and the final forging temperature is controlled at ≥1000℃. The specific process is as follows: S101: The steel ingot is free-forged into a billet, the surface is lightly tapped and the two ends are riveted and upset to obtain a billet with a specification of Ф340mm*850mm; S102: Heat the billet to 1180℃ and hold it for more than 1 hour. After taking it out of the furnace, upset it to 420mm and then draw it to Ф340mm*850mm to refine the grains. S103: Heat the billet to 1182℃ and hold it for more than 1 hour. After taking it out of the furnace, upset it to 400mm, draw it out and roll it into a round drum-shaped billet with a diameter of Ф450mm*490mm. S104: Heat the round drum-shaped billet to 1165℃ and hold it for more than 1.5 hours. Insert the round head into a special stencil for upsetting, hole expansion and shaping and size adjustment. During the forging process, the single-sided reduction shall not be less than 50mm to ensure that the billet is forged through.
[0025] In the above process, the steel ingot is first free-forged into a billet. After lightly tapping the surface, the two ends are riveted and upset to obtain a billet with a specification of Ф340mm*850mm. Then, the billet is heated to 1180℃ and held for more than 1 hour. After being taken out of the furnace, it is upset to 420mm and then drawn to Ф340mm*850mm to refine the grains. The billet is then heated to 1182℃ and held for more than 1 hour. After being taken out of the furnace, it is upset to 400mm and drawn and rolled into a round drum-shaped billet of Ф450mm*490mm. Finally, the round drum-shaped billet is heated to 1165℃ and held for more than 1.5 hours. The round end is inserted into a special die for upsetting, hole expansion and shaping and size adjustment. During the forging process, the single-sided reduction is not less than 50mm to ensure that the billet is forged through.
[0026] S200: The formed forgings are sent into the furnace for heat treatment, and the temperature is precisely controlled by multi-point contact thermocouples throughout the process.
[0027] In this embodiment, the formed forging is sent into a furnace for heat treatment. The temperature is precisely controlled by a multi-point contact thermocouple throughout the process. Specifically, the formed forging is sent into the furnace at ≤600℃, first heated to 700~1000℃ and held, then heated to 1080~1240℃ and held for ≥30 minutes. After being taken out of the furnace, it is cooled by water to complete the solution heat treatment.
[0028] S300: Perform performance and non-destructive testing on heat-treated forgings.
[0029] In this embodiment, the performance and non-destructive testing of the heat-treated forgings are carried out. The specific process is as follows: S301: Samples shall be taken according to the product's technical requirements for testing of mechanical properties, metallographic structure, and chemical composition. S302: Perform ultrasonic testing, visual inspection, and penetrant testing on forgings to ensure that the forgings are free of record-level defects. In the above process, samples were first taken according to the product technical requirements for mechanical properties, metallographic structure, and chemical composition testing. Then, ultrasonic testing (UT), visual inspection (VT), and penetrant testing (PT) were performed on the forgings to ensure that the forgings were free of record-level defects. Among them, the mechanical properties of the forgings met the following requirements: at 22℃, Rp0.2≥300MPa, Rm≥750MPa, elongation after fracture≥30%, KV2>45J; at 500℃, Rp0.2≥220MPa, Rm≥680MPa, elongation after fracture≥30%; at 700℃, Rp0.2≥200MPa, Rm≥420MPa, elongation after fracture≥30%, and grain size≥2.5 grade. See Tables 1 to 3. Table 1 Table 2 Table 3 S400: Forgings that have passed inspection are processed using specialized machining equipment, and the dimensional accuracy of the forgings meets the requirements of the finished product drawings.
[0030] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.
[0031] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.
Claims
1. A forging method for a Hastelloy 230 alloy flange forging, characterized in that, Includes the following steps: The treated Hastelloy 230 alloy ingot was forged and deformed on a 5000-ton press to obtain shaped forgings, with a total forging ratio of 3.7, and the initial forging temperature was controlled at ≥1160℃ and the final forging temperature was controlled at ≥1000℃. The formed forgings are sent into the furnace for heat treatment, and the temperature is precisely controlled by multi-point contact thermocouples throughout the process. Performance and non-destructive testing are performed on the heat-treated forgings; Specialized machining equipment is used to process the qualified forgings, and the dimensional accuracy of the forgings meets the requirements of the finished product drawings.
2. The forging method for Hastelloy 230 alloy flange forgings as described in claim 1, characterized in that, The treated Hastelloy 230 alloy ingot was forged and deformed on a 5000-ton press to obtain shaped forgings, with a total forging ratio of 3.
7. The steps involved controlling the initial forging temperature at ≥1160℃ and the final forging temperature at ≥1000℃. The steel ingot is free-forged into a billet, the surface is lightly tapped and the two ends are riveted and upset, and the billet is blanked to obtain a billet with a specification of Ф340mm*850mm; The billet is heated to 1180℃ and held for more than 1 hour. After being taken out of the furnace, it is upturned to 420mm and then drawn into Ф340mm*850mm to refine the grains. The billet is heated to 1182℃ and held for more than 1 hour. After being taken out of the furnace, it is upturned to 400mm, drawn and rolled into a round drum-shaped billet of Ф450mm*490mm. The round drum-shaped billet is heated to 1165℃ and held for more than 1.5 hours. The round head is inserted into a special stencil for upsetting, hole expansion and shaping and size adjustment. During the forging process, the single-sided reduction is not less than 50mm to ensure that the billet is forged through.
3. The forging method for Hastelloy 230 alloy flange forgings as described in claim 1, characterized in that, In the process of sending the formed forgings into the furnace for heat treatment, the temperature is precisely controlled throughout using multi-point contact thermocouples: The forged parts are placed in the furnace at ≤600℃, heated to 700~1000℃ and held, then heated to 1080~1240℃ and held for ≥30 minutes. After being taken out of the furnace, the solution heat treatment is completed by water cooling.
4. The forging method for Hastelloy 230 alloy flange forgings as described in claim 1, characterized in that, In the steps of performing performance and non-destructive testing on heat-treated forgings: Samples were taken according to the product's technical requirements for testing of mechanical properties, metallographic structure, and chemical composition. Ultrasonic testing, visual inspection, and penetrant testing are performed on forgings to ensure that they are free of record-level defects.
5. The forging method for Hastelloy 230 alloy flange forgings as described in claim 1, characterized in that, In the process of sampling and testing mechanical properties, metallographic structure, and chemical composition according to product technical requirements: The mechanical properties of the forgings shall meet the following requirements: at 22℃, Rp0.2≥300MPa, Rm≥750MPa, elongation after fracture≥30%, KV2>45J; at 500℃, Rp0.2≥220MPa, Rm≥680MPa, elongation after fracture≥30%; at 700℃, Rp0.2≥200MPa, Rm≥420MPa, elongation after fracture≥30%, and grain size≥2.5 grade.