CN-121992230-A - GH5188 alloy steel smelting process

Abstract

The GH5188 alloy steel smelting process can be used for carrying out dehydrogenation treatment on cobalt raw materials, specifically, the cobalt raw materials are placed into an electric heating drying furnace, the temperature is raised to 600 ℃ and then kept for 8 hours, the content of hydrogen (H), nitrogen (N) and oxygen (O) in finished alloy can be effectively reduced, the service life of the alloy is prolonged, in the process, firstly, cooling is carried out to 1480-1530 ℃, lanthanum (La) is packaged by aluminum foil and then is added independently, the volatilization of lanthanum (La) can be reduced by adopting a method of aluminum foil packaging, so that the content of lanthanum (La) in the product meets the requirement, and the cost is greatly reduced under the condition of meeting the product quality.

Inventors

• BIAN XINGLAI
• BIAN ZHIPENG
• ZUO WEI

Assignees

• 江苏兴达高温合金科技有限公司

Dates

Publication Date

20260508

Application Date

20260227

Claims (3)

1. 1. A smelting process of GH5188 alloy steel is characterized by comprising the following steps: (1) Preparing raw materials according to the required amount of each element, wherein the raw materials comprise carbon (C), chromium (Cr), nickel (Ni), iron (Fe), tungsten (W), lanthanum (La), silicon (Si), manganese (Mn), boron (B), aluminum (Al) and cobalt (Co); (2) The method comprises the steps of carrying out dehydrogenation treatment on cobalt (Co) raw materials, specifically putting the cobalt raw materials into an electric heating drying furnace, heating to 600 ℃ and then preserving heat for 8 hours, wherein the step can effectively reduce the contents of hydrogen (H), nitrogen (N) and oxygen (O) in the finished alloy, and prolong the service life of the alloy; (3) Drying water content of other raw materials by using an electric heating drying furnace; (4) Charging raw materials into a vacuum induction melting furnace, wherein chromium (Cr), nickel (Ni), iron (Fe), tungsten (W), cobalt (Co) are charged into a crucible of the vacuum induction melting furnace, and tungsten (W), cobalt (Co) are charged into the middle upper part of the crucible; Carbon (C) is filled in three times, wherein the first time is filled on chromium (Cr) in a crucible, the second time is filled under nickel (Ni) in the crucible, the third time is filled in a small hopper of a vacuum induction melting furnace, and the carbon (C) and aluminum (Al) are added into molten steel in two times; (5) After the furnace is closed, a slide valve type vacuum pump, a Roots pump and an oil diffusion vacuum pump are started step by step to achieve a vacuum effect; Melting after vacuumizing, heating to 1560-1590 ℃ to completely melt, refining for 50 min, cooling to 1520-1550 ℃, sequentially adding silicon (Si), manganese (Mn), boron (B) and aluminum (Al), heating to 1570-1590 ℃ and stirring to realize deoxidation; Cooling to 1480-1530 ℃, packaging lanthanum (La) with aluminum foil, adding separately, stirring to obtain molten steel, cooling, and packaging with aluminum foil to reduce volatilization of lanthanum (La) and enable lanthanum (La) content in the product to meet the requirement; (6) Immediately casting the obtained molten steel to obtain a steel rod after casting; (7) And D, remelting the steel rod obtained in the step six in a remelting electroslag furnace to obtain the GH5188 alloy steel ingot.
2. 2. The GH5188 alloy steel smelting process according to claim 1 is characterized in that a slide valve type vacuum pump is started firstly, the vacuum degree reaches 1950pa-2010pa under the action of the slide valve type vacuum pump, a Roots pump is started secondly, the vacuum degree reaches 10pa-12pa under the action of the Roots pump, and finally an oil diffusion vacuum pump is started, and the vacuum degree reaches 0 pa-5 pa under the action of the oil diffusion vacuum pump.
3. 3. The GH5188 alloy steel smelting process according to claim 1, wherein the steel rod obtained in the step (6) is subjected to polishing treatment and is used in the step (7) after the surface oxide layer is removed.

Description

GH5188 alloy steel smelting process Technical Field The invention relates to the technical field of metal smelting, in particular to a GH5188 alloy steel smelting process. Background GH5188 alloy steel is a cobalt-nickel-chromium-based strengthened superalloy with both high temperature mechanical properties and excellent ductility, and is commonly used in the aerospace field. The material requirement for high quality GH5188 alloy steel is that the lanthanum (La) content therein should be controlled to 0.03% -0.12% in order to ensure excellent oxide film adhesion. However, according to the existing conventional GH5188 alloy steel smelting process, the rare earth element lanthanum (La) is volatilized in a large amount in the production process, so that the quality of the final GH5188 alloy steel does not reach the standard. To solve this problem, the existing process technology generally adopts to add a higher proportion of rare earth element lanthanum (La) to make the finished product meet the requirements, but this makes the production cost too high. Disclosure of Invention The invention aims to provide a GH5188 alloy steel smelting process for solving the problems. The technical aim of the invention is realized by the following technical scheme that the GH5188 alloy steel smelting process comprises the following steps: (1) Preparing raw materials according to the required amounts of the respective elements, wherein each raw material comprises carbon (C), chromium (Cr), nickel (Ni), iron (Fe), tungsten (W), lanthanum (La), silicon (Si), manganese (Mn), boron (B), aluminum (Al), cobalt (Co); (2) The method comprises the steps of carrying out dehydrogenation treatment on the cobalt raw material, namely putting the cobalt raw material into an electric heating drying furnace, heating to 600 ℃, and then preserving heat for 8 hours, wherein the step can effectively reduce the contents of hydrogen (H), nitrogen (N) and oxygen (O) in the finished alloy, and prolong the service life of the alloy; (3) Drying water content of other raw materials by using an electric heating drying furnace; (4) Charging raw materials into a vacuum induction melting furnace, wherein chromium (Cr), nickel (Ni), iron (Fe), tungsten (W), cobalt (Co) are charged into a crucible of the vacuum induction melting furnace, and tungsten (W), cobalt (Co) are charged into the middle upper part of the crucible; Carbon (C) is filled in three times, wherein the first time is filled on chromium (Cr) in a crucible, the second time is filled under nickel (Ni) in the crucible, the third time is filled in a small hopper of a vacuum induction melting furnace, and the carbon (C) and aluminum (Al) are added into molten steel in two times; (5) After the furnace is closed, a slide valve type vacuum pump, a Roots pump and an oil diffusion vacuum pump are started step by step to achieve a vacuum effect; Melting after vacuumizing, heating to 1560-1590 ℃ to completely melt, refining for 50 min, cooling to 1520-1550 ℃, sequentially adding silicon (Si), manganese (Mn), boron (B) and aluminum (Al), heating to 1570-1590 ℃ and stirring to realize deoxidation; And cooling to 1480-1530 ℃, wrapping lanthanum (La) with aluminum foil, adding, stirring to obtain molten steel, cooling, and wrapping with aluminum foil to reduce volatilization of lanthanum (La) so that lanthanum (La) content in the product meets the requirement. (6) And immediately casting the obtained molten steel to obtain the steel bar after casting. (7) And D, remelting the steel rod obtained in the step six in a remelting electroslag furnace to obtain the GH5188 alloy steel ingot. Preferably, the slide valve type vacuum pump is started firstly, the vacuum degree reaches 1950pa-2010pa under the action of the slide valve type vacuum pump, then the Roots pump is started, the vacuum degree reaches 10pa-12pa under the action of the Roots pump, and finally the oil diffusion vacuum pump is started, and the vacuum degree reaches 2.3pa-4.2pa under the action of the oil diffusion vacuum pump. Preferably, the steel bar obtained in step (6) is subjected to polishing treatment, and after the surface oxide layer is removed, the steel bar can be used in step (7). In summary, the invention has the following beneficial effects: 1. The method can be used for carrying out dehydrogenation treatment on the cobalt raw material, specifically, the cobalt raw material is put into an electric heating drying furnace, and is heated to 600 ℃ and then is kept for 8 hours, so that the content of hydrogen (H), nitrogen (N) and oxygen (O) in the finished alloy can be effectively reduced, and the service life of the alloy is prolonged. 2. After the furnace is closed, three pumps are started step by step to achieve a vacuum effect, a slide valve type vacuum pump is started firstly, the vacuum degree reaches 1950pa-2010pa under the action of the slide valve type vacuum pump, a Roots pump is started secondly, the vacuum degree reaches 10pa-12p