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CN-121972591-A - Forging forming method of Hash 230 alloy flange forging

CN121972591ACN 121972591 ACN121972591 ACN 121972591ACN-121972591-A

Abstract

The invention relates to the technical field of high-temperature alloy forging, in particular to a forging forming method of a Hastelloy 230 alloy flange forging, which comprises the following steps of forging and deforming a processed Hastelloy 230 alloy cast ingot on a 5000-ton press to obtain a formed forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled to be more than or equal to 1160 ℃, the final forging temperature is controlled to be more than or equal to 1000 ℃, the formed forging is sent into a furnace for heat treatment, the performance and the nondestructive detection are carried out on the forging subjected to the heat treatment in the whole process, the special machining equipment is adopted for machining the forging subjected to the detection, the dimensional accuracy of the forging meets the requirement of a finished product drawing, the casting defects of pores, shrinkage cavities and slag inclusions in the forging can be reduced obviously, the internal structure state of the forging is improved, the problems of coarsening and uneven structure of crystal grains are avoided, and the stability of the product quality is improved.

Inventors

  • MA WUJIANG
  • WANG BO
  • DENG CHUNHUA
  • WANG YUANHUA
  • LU JING

Assignees

  • 上海新闵（东台）重型锻造有限公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (5)

  1. 1. A forging forming method of a Hash 230 alloy flange forging is characterized by comprising the following steps: Forging and deforming the processed hastelloy 230 alloy cast ingot on a 5000-ton press to obtain a formed forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled to be more than or equal to 1160 ℃, and the final forging temperature is controlled to be more than or equal to 1000 ℃; Feeding the formed forging into a furnace for heat treatment, and precisely controlling the temperature by using multipoint contact thermocouples in the whole process; performing performance and nondestructive testing on the forge piece after heat treatment; and processing the forge piece which is qualified in detection by adopting special machining equipment, wherein the dimensional accuracy of the forge piece meets the requirement of a finished product drawing.
  2. 2. The forging forming method of hastelloy 230 alloy flange forgings according to claim 1, wherein the forging deformation is carried out on the hastelloy 230 alloy cast ingots after treatment on a 5000 ton press to obtain formed forgings, wherein the total forging ratio is 3.7, the initial forging temperature is controlled to be more than or equal to 1160 ℃, and the final forging temperature is controlled to be more than or equal to 1000 ℃ in the steps of: freely forging a steel ingot to prepare a blank, tapping the surface, riveting and upsetting two ends, and blanking to obtain a blank with the specification phi 340mm x 850 mm; heating the blank to 1180 ℃ and preserving heat for more than 1h, upsetting to 420mm after discharging, and drawing to obtain phi 340mm x 850mm so as to refine grains; Heating the blank to 1182 ℃ and preserving heat for more than 1h, upsetting to 400mm after discharging, and drawing out and rounding to form a drum-shaped blank with the diameter of 450mm and the diameter of 190 mm; the round drum-shaped blank is heated to 1165 ℃ and kept at the temperature for more than 1.5 hours, the round head is inserted into a special drain pan to be upset, reamed and trimmed, wherein single-side rolling reduction is not less than 50mm in the forging process, so that blank forging is guaranteed.
  3. 3. The forging forming method of hastelloy 230 alloy flange forgings according to claim 1, wherein in the step of feeding the formed forgings into a furnace for heat treatment and precisely controlling temperature by using multipoint contact thermocouples in the whole process: And (3) feeding the formed forging into a furnace when the temperature is less than or equal to 600 ℃, firstly heating to 700-1000 ℃ for heat preservation, then heating to 1080-1240 ℃ for heat preservation for more than or equal to 30 minutes, and discharging and then adopting a water cooling mode to finish solution heat treatment.
  4. 4. The forging forming method of hastelloy 230 alloy flange forgings as recited in claim 1, wherein in the step of performing performance and nondestructive testing of the heat treated forgings: sampling according to the technical requirements of products to detect mechanical properties, metallographic structures and chemical components; and carrying out ultrasonic detection, visual detection and penetration detection on the forge piece to ensure that the forge piece has no recording grade defect.
  5. 5. The forging forming method of hastelloy 230 alloy flange forging as recited in claim 1, wherein in the step of sampling according to product technical requirements for mechanical property, metallographic structure and chemical composition detection: The mechanical properties of the forging meet the requirements that Rp0.2 is more than or equal to 300MPa, rm is more than or equal to 750MPa, elongation after break is more than or equal to 30%, KV 2 is more than 45J, rp0.2 is more than or equal to 220MPa, rm is more than or equal to 680MPa, elongation after break is more than or equal to 30% at 500 ℃, rp0.2 is more than or equal to 200MPa, rm is more than or equal to 420MPa, elongation after break is more than or equal to 30% at 700 ℃, and grain size is more than or equal to 2.5 level.

Description

Forging forming method of Hash 230 alloy flange forging Technical Field The invention relates to the technical field of high-temperature alloy forging, in particular to a forging forming method of a Hash 230 alloy flange forging. Background The Harder 230 alloy is a typical nickel-chromium-tungsten-molybdenum high-temperature alloy, has the long-term service temperature of 1150 ℃, has excellent creep resistance, oxidation resistance and corrosion resistance in a high-temperature environment, and can effectively resist the corrosion of high-temperature media containing corrosive impurities such as halogen, oxide and the like, so that the Harder 230 alloy is widely applied to flange connection parts of engine combustion chambers and turbine cases in the aerospace field, and high-end parts such as high-temperature media conveying pipeline flanges of fourth-generation nuclear power high-temperature gas cooled reactors and tower type solar thermal power generation systems. The flange part needs to bear complex working conditions such as high-temperature gas flushing, frequent thermal circulation, vibration load and the like for a long time, has strict requirements on structural compactness and performance stability, and the cast or welded part is easy to cause sealing failure or structural fracture due to internal loosening, cracks and other defects, so that a 'densification' structure is realized by forging and forming, the binding force of a grain boundary is improved, and the service reliability is ensured. The prior double-vacuum smelting process of a vacuum induction furnace and a vacuum consumable furnace reduces the content of harmful elements such as sulfur, phosphorus and the like in alloy, solves the problem of hot embrittlement of alloy, simultaneously develops a process of step heating, multi-pass die forging and isothermal forging, solves the difficult problem of forming a large-size flange with DN600 or more, introduces full-flow detection means such as ultrasonic flaw detection, penetration detection and the like, and ensures the basic quality of forgings. However, the Hastelloy 230 alloy has high alloy element content, high-temperature deformation resistance and narrow hot working window, when produced by adopting the traditional process, the cast ingot is easy to have casting defects of air holes, shrinkage cavities and slag inclusion, and the metal has poor fluidity in the forging process, is easy to have forming defects of cold insulation and insufficient casting, and influences the stability of product quality. Disclosure of Invention The invention aims to provide a forging forming method of a Hash 230 alloy flange forging, which aims to solve the technical problems that when the forging forming method is used for producing the Hash 230 alloy flange forging by the traditional process, cast defects such as air holes, shrinkage holes and slag inclusion are easy to occur in cast ingots, and forming defects such as cold insulation and insufficient casting are easy to occur in the metal fluidity in the forging process, so that the stability of the product quality is influenced. In order to achieve the purpose, the forging forming method of the Hash 230 alloy flange forging piece comprises the following steps: Forging and deforming the processed hastelloy 230 alloy cast ingot on a 5000-ton press to obtain a formed forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled to be more than or equal to 1160 ℃, and the final forging temperature is controlled to be more than or equal to 1000 ℃; Feeding the formed forging into a furnace for heat treatment, and precisely controlling the temperature by using multipoint contact thermocouples in the whole process; performing performance and nondestructive testing on the forge piece after heat treatment; and processing the forge piece which is qualified in detection by adopting special machining equipment, wherein the dimensional accuracy of the forge piece meets the requirement of a finished product drawing. Wherein, forging and deforming the processed hastelloy 230 alloy cast ingot on a 5000 ton press to obtain a formed forging, wherein the total forging ratio is 3.7, the initial forging temperature is controlled to be more than or equal to 1160 ℃, and the final forging temperature is controlled to be more than or equal to 1000 ℃ in the steps of: freely forging a steel ingot to prepare a blank, tapping the surface, riveting and upsetting two ends, and blanking to obtain a blank with the specification phi 340mm x 850 mm; heating the blank to 1180 ℃ and preserving heat for more than 1h, upsetting to 420mm after discharging, and drawing to obtain phi 340mm x 850mm so as to refine grains; Heating the blank to 1182 ℃ and preserving heat for more than 1h, upsetting to 400mm after discharging, and drawing out and rounding to form a drum-shaped blank with the diameter of 450mm and the diameter of 190 mm; the round drum-shaped bla