CN113667878A - Smelting method of GH907 alloy - Google Patents
Smelting method of GH907 alloy Download PDFInfo
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Abstract
The invention relates to the technical field of alloy material smelting, in particular to a smelting method of GH907 alloy, which comprises the following steps: step one, heating and smelting carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon alloy, adding a reclaimed material after raw materials are completely molten, and smelting; refining the smelted melt for 55-65 min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1480-1520 ℃, then carrying out deoxidation and denitrification operation, adding metal aluminum, metal titanium and metal niobium into the melt, then carrying out alloying treatment, and adding metal manganese and ferroboron alloy after the alloying treatment is finished; and step three, pouring. The method provided by the invention is simple to operate, and the GH907 alloy is prepared by a method of smelting the reclaimed materials and brand new raw materials together, so that the production cost of the GH907 alloy can be greatly reduced, and the quality stability of the GH907 alloy and the performance level of the GH907 alloy can be improved.
Description
Technical Field
The invention relates to the technical field of alloy material smelting, in particular to a smelting method of GH907 alloy.
Background
The GH907 alloy is a precipitation strengthening austenite alloy based on iron-nickel-cobalt, is comprehensively strengthened by Nb, Ti, Si and trace B, has high tensile strength below 650 ℃, low expansion coefficient, good cold and hot fatigue resistance, good welding performance, good high-pressure hydrogen embrittlement resistance and almost constant elastic modulus, is widely used as an outer ring, a sealing ring and the like of an engine turbine, and is particularly used for manufacturing an important casing component of an aeroengine, so as to accurately control the gap between a turbine blade and the outer ring, improve the performance of the engine and improve the combustion efficiency.
At present, the GH907 alloy produced in China is mainly produced by adopting brand-new raw materials such as metallic nickel, metallic cobalt, metallic niobium, metallic titanium and the like as raw materials, refined low-carbon, low-silicon, low-aluminum and low-chromium refined steel materials subjected to refining treatment and even nickel-niobium alloy with higher cost, and the cost of the raw materials is far higher than the price of imported materials, so that the GH907 alloy produced in China is in the leeward in the competition of the international market. And brand new raw materials in the raw materials of the GH907 alloy produced by the existing domestic process are usually from ores in different mines, wherein the content of impurity elements is more and unstable, the endurance performance of the alloy is reduced due to the higher content of phosphorus element in the GH907 alloy, chromium element is a main factor influencing the thermal expansion coefficient of the alloy, and the lower the content of chromium is, the lower the expansion coefficient is. Therefore, if brand new raw materials are adopted to smelt the GH907 alloy, the phosphorus and chromium content in the final product is increased, the endurance performance of the alloy is reduced, the expansion coefficient of the alloy is increased, and finally the quality stability of the produced GH907 alloy is uncontrollable and the performance fluctuation is large.
Disclosure of Invention
Based on the problems in the prior art, the invention provides the smelting method of the GH907 alloy, and the smelting method of the GH907 alloy by using the cleaned reclaimed materials and brand new raw materials can greatly reduce the production cost of the GH907 alloy, improve the quality stability of the GH907 alloy and the performance level of the GH907 alloy, and overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the invention provides a smelting method of GH907 alloy, comprising the following steps:
step one, heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1440-1480 ℃ for smelting, adding a reclaimed material after raw materials are completely molten, and smelting, wherein the reclaimed material is obtained by cleaning waste materials generated in the processing process of the GH907 alloy, and the mass of the reclaimed material is 30-50% of that of all raw materials;
refining the smelted melt for 55-65 min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1480-1520 ℃, then carrying out deoxidation and denitrification operation, adding metal aluminum, metal titanium and metal niobium into the melt, then carrying out alloying treatment, and adding metal manganese and ferroboron alloy after the alloying treatment is finished;
and step three, pouring.
The smelting method of the GH907 alloy prepares the GH907 alloy by smelting the reclaimed materials and brand new raw materials together, and the quality of the reclaimed materials is controlled to be 30-50% of the quality of all the raw materials, so that the production cost of the GH907 alloy can be greatly reduced, the refining time can be shortened, and alloy products with satisfied components and good performance can be obtained by smelting. And the smelting method aims at the characteristics that the purity of the interior of the reclaimed material is higher than that of a brand new raw material, and the macroscopic density and the melting point are lower than those of the brand new raw material, the brand new raw material is added firstly, after the brand new raw material is completely melted, water vapor, impurities and the like in the brand new raw material are fully pumped away, the reclaimed material is added, the content of impurity elements in the alloy can be reduced, the lower content of phosphorus and chromium in the alloy can be ensured, the quality stability of the GH907 alloy and the performance level of the GH907 alloy are improved, the metallurgical quality is further improved by controlling the using amount of the reclaimed material and the refining temperature and the refining time matched with the raw material, and the defects of the prior art are overcome.
Preferably, the chemical composition of the GH907 alloy is as follows: 0.02-0.035 wt%, Ni: 37-39 wt%, Cr: 0.05 to 0.5 wt%, Co: 13.7-14.8 wt%, Al: 0.03-0.15 wt%, Ti: 1.35-1.65 wt%, Nb + Ta: 4.5-4.9 wt%, Mn: 0.1-0.6 wt%, P < 0.003 wt%, Cu < 0.02 wt%, Mo < 0.02 wt%, B: 0.004 to 0.006 wt%, Si: 0.28-0.34 wt%, S less than 0.002 wt%, and Fe and inevitable impurity for the rest. The regenerated material is obtained by cleaning the waste material generated in the processing process of the GH907 alloy, so the chemical components in the regenerated material are the same as those of the GH907 alloy.
Preferably, the method for cleaning the waste material comprises the following steps: A. magnetic separation impurity removal, B wind blowing impurity removal, C spraying rough washing, D alkali liquor ultrasonic cleaning, G wind cutting drying, H sand washing operation, I sand material separation, J bubbling rinsing, K neutral drying, L wind cutting drying and M drying operation.
Preferably, in the step one, the melting power for melting carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon is 400-1000 KW, and the melting power for melting by adding the reclaimed materials is 1000-1400 KW.
The smelting method can fully extract water vapor, impurities and the like in the brand-new raw materials by smelting the brand-new raw materials at low power and prolonging the smelting time of the brand-new raw materials, add all the reclaimed materials when the quality level of the brand-new raw materials is equal to that of the reclaimed materials, and further improve the metallurgical quality by high-power melting and short-time refining processes.
Preferably, in the first step, the addition amount of the carbon is two thirds of the total content of the carbon in the GH907 alloy
Preferably, in step two, the deoxidation and denitrification are carried out so as to reduce the oxygen content in the melt to not more than 20ppm and the nitrogen content to not more than 50 ppm.
The tensile strength and the cold and hot fatigue resistance of the alloy can be improved by controlling the contents of oxygen and nitrogen in the melt.
Preferably, in step two, the deoxidation is performed by adding aluminium and carbon to the melt.
And if the oxygen content in the melt does not reach the standard, adding aluminum and carbon into the melt for deoxidation. Optionally, aluminum is added into the melt, the content of the aluminum accounts for 0.01-0.02% of the mass of the GH907 alloy, and carbon is added into the melt, and the content of the carbon accounts for 0.015-0.025% of the mass of the GH907 alloy. After adding aluminum and carbon into the melt and enabling the aluminum and the carbon to reach the content range, the oxygen content in the melt can be reduced to be below 20 ppm. By directly controlling the adding amount of the aluminum and the carbon, the oxygen content can be prevented from being detected for many times in the deoxidation process, thereby simplifying the operation.
Preferably, in the second step, the temperature of the alloying treatment is 1480-1520 ℃.
Preferably, in the third step, the casting temperature is 1440-1460 ℃.
And when the content of each element in the melt meets the chemical composition requirement of the GH907 alloy, casting.
The smelting method of the GH907 alloy provided by the invention prepares the GH907 alloy by a method of smelting the reclaimed materials and brand new raw materials together, so that the production cost of the GH907 alloy is greatly reduced. The smelting method aims at the characteristics of the reclaimed materials and the brand-new raw materials, the brand-new raw materials are firstly added, the brand-new raw materials are smelted at low power, the smelting time of the brand-new raw materials is prolonged, water vapor, impurities and the like in the brand-new raw materials can be fully pumped away, the reclaimed materials are added after the quality level of the brand-new raw materials is equal to that of the reclaimed materials, the content of impurity elements in the alloy can be reduced, the lower content of phosphorus and chromium in the alloy can be ensured, the quality stability of the GH907 alloy and the performance level of the GH907 alloy are improved, and the metallurgical quality is further improved through large-smelting-rate smelting and short-time refining processes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The raw materials of the smelting method of the GH907 alloy of the following examples are as follows: carbon, electrolytic nickel, refined steel, metal cobalt and ferrosilicon alloy, reclaimed materials, metal aluminum, metal titanium, metal niobium, metal manganese, ferroboron alloy and the like.
The reclaimed materials in the following embodiments are obtained by cleaning waste materials generated in the processing process of other batches of GH907 alloy, and the cleaning method comprises the following steps: A. magnetic separation impurity removal, B wind blowing impurity removal, C spraying rough washing, D alkali liquor ultrasonic cleaning, G wind cutting drying, H sand washing operation, I sand material separation, J bubbling rinsing, K neutral drying, L wind cutting drying and M drying operation. The components of the reclaimed materials in each example are as follows: c: 0.02-0.035 wt%, Ni: 37-39 wt%, Cr: 0.05 to 0.5 wt%, Co: 13.7-14.8 wt%, Al: 0.03-0.15 wt%, Ti: 1.35-1.65 wt%, Nb + Ta: 4.5-4.9 wt%, Mn: 0.1-0.6 wt%, P < 0.003 wt%, Cu < 0.02 wt%, Mo < 0.02 wt%, B: 0.004 to 0.006 wt%, Si: 0.28-0.34 wt%, S less than 0.002 wt%, and Fe and inevitable impurity for the rest.
Example 1
The embodiment provides a smelting method of GH907 alloy, comprising the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1440 ℃ for smelting, wherein the smelting power is 1000KW, adding a reclaimed material after the raw materials are completely smelted, and smelting, wherein the mass of the reclaimed material is 30% of that of all the raw materials, and the smelting power after the reclaimed material is added is 1400 KW.
(2) Refining the smelted melt for 65min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1480 ℃, stirring and degassing, sampling and monitoring the oxygen and nitrogen contents in the alloy, wherein the standards of the oxygen and nitrogen contents in the melt are as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the content of aluminum added into the melt accounts for 0.01 percent of the mass of the GH907 alloy, the content of carbon added into the melt accounts for 0.025 percent of the mass of the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. And when the oxygen content and the nitrogen content in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in the GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1520 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, the pouring temperature is 1440 ℃, and the chemical components of the finally smelted alloy are as follows: 0.022 wt%, Ni: 38.41 wt%, Cr: 0.08 wt%, Co: 14.06 wt%, Al: 0.05 wt%, Ti: 1.62 wt%, Nb + Ta: 4.89 wt%, Mn: 0.58 wt%, P: 0.002 wt%, Cu: 0.01 wt%, Mo: 0.01 wt%, B: 0.004 wt%, Si: 0.29 wt%, S: 0.001 wt%, and the balance of Fe and inevitable impurities.
Example 2
The embodiment provides a smelting method of GH907 alloy, comprising the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1480 ℃ for smelting, wherein the melting power is 400KW, adding the reclaimed material after the raw materials are completely melted, and smelting, wherein the mass of the reclaimed material is 50% of that of all the raw materials, and the melting power after adding the reclaimed material is 1000 KW.
(2) Refining the smelted melt for 55min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1520 ℃, stirring and degassing, sampling and monitoring the oxygen and nitrogen contents in the alloy, wherein the standards of the oxygen and nitrogen contents in the melt are as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the content of aluminum added into the melt accounts for 0.02 percent of the mass of the GH907 alloy, the content of carbon added into the melt accounts for 0.015 percent of the mass of the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1480 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, the pouring temperature is 1460 ℃, and the chemical components of the alloy obtained by smelting are as follows: 0.027 wt%, Ni: 38.67 wt%, Cr: 0.09 wt%, Co: 14.12 wt%, Al: 0.04 wt%, Ti: 1.63 wt%, Nb + Ta: 4.98 wt%, Mn: 0.60 wt%, P: 0.002 wt%, Cu: 0.01 wt%, Mo: 0.01 wt%, B: 0.004 wt%, Si: 0.30 wt%, S: 0.001 wt%, and the balance of Fe and inevitable impurities.
Example 3
The embodiment provides a smelting method of GH907 alloy, comprising the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1460 ℃ for smelting, wherein the smelting power is 700KW, adding a reclaimed material after the raw materials are completely smelted, smelting, the mass of the reclaimed material is 45% of that of all the raw materials, and the smelting power after the reclaimed material is added is 1200 KW.
(2) Refining the smelted melt for 60min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1500 ℃, stirring and degassing, sampling and monitoring the oxygen and nitrogen contents in the alloy, wherein the standards of the oxygen and nitrogen contents in the melt are as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the content of aluminum added into the melt accounts for 0.015 percent of the mass of the GH907 alloy, the content of carbon added into the melt accounts for 0.02 percent of the mass of the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1510 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, the pouring temperature is 1450 ℃, and the chemical components of the finally smelted alloy are as follows: 0.028 wt%, Ni: 38.22 wt%, Cr: 0.10 wt%, Co: 14.13 wt%, Al: 0.03 wt%, Ti: 1.65 wt%, Nb + Ta: 5.13 wt%, Mn: 0.59 wt%, P: 0.002 wt%, Cu: 0.01 wt%, Mo: 0.01 wt%, B: 0.004 wt%, Si: 0.31 wt%, S: 0.001 wt%, and the balance of Fe and inevitable impurities.
Example 4
The embodiment provides a smelting method of GH907 alloy, comprising the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1440 ℃ for smelting, wherein the smelting power is 500KW, adding the reclaimed material after the raw materials are completely smelted, and smelting, wherein the mass of the reclaimed material is 40% of that of all the raw materials, and the smelting power after the reclaimed material is added is 1100 KW.
(2) Refining the smelted melt for 62min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1490 ℃, stirring and degassing, sampling and monitoring the content of oxygen and nitrogen in the alloy, wherein the standard of the content of oxygen and nitrogen in the melt is as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, aluminum and carbon are added into the melt for deoxidation if the oxygen content in the melt is more than 20ppm, the aluminum content in the melt accounts for 0.014% of the mass of the GH907 alloy, the carbon content in the melt accounts for 0.021% of the mass of the GH907 alloy, and the nitrogen content in the melt is more than 50ppm, the vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1500 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, the pouring temperature is 1455 ℃, and the chemical components of the alloy obtained by smelting are as follows: 0.025 wt%, Ni: 38.10 wt%, Cr: 0.07 wt%, Co: 14.05 wt%, Al: 0.03 wt%, Ti: 1.64 wt%, Nb + Ta: 4.95 wt%, Mn: 0.58 wt%, P: 0.002 wt%, Cu: 0.01 wt%, Mo: 0.01 wt%, B: 0.004 wt%, Si: 0.30 wt%, S: 0.001 wt%, and the balance of Fe and inevitable impurities.
Comparative example 1
The comparative example provides a smelting method of GH907 alloy tested in the research process, which comprises the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1460 ℃ for smelting, wherein the smelting power is 1200KW, and obtaining the smelted raw materials.
(2) Refining the smelted raw materials for 60min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1500 ℃, stirring and degassing, sampling and monitoring the oxygen and nitrogen contents in the alloy, wherein the standards of the oxygen and nitrogen contents in the melt are as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the content of aluminum added into the melt accounts for 0.015 percent of the mass of the GH907 alloy, the content of carbon added into the melt accounts for 0.02 percent of the mass of the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1510 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, and the pouring temperature is 1450 ℃.
Comparative example 2
The comparative example provides a smelting method of GH907 alloy tested in the research process, which comprises the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt, ferrosilicon alloy and reclaimed materials to 1460 ℃ together for smelting, wherein the mass of the reclaimed materials is 45% of the mass of all the raw materials, and the melting power is 1200KW, so as to obtain the smelted raw materials.
(2) Refining the smelted raw materials for 60min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1500 ℃, stirring and degassing, sampling and monitoring the oxygen and nitrogen contents in the alloy, wherein the standards of the oxygen and nitrogen contents in the melt are as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the addition amount of aluminum is 0.015 percent of the total content of aluminum in the GH907 alloy, the addition amount of carbon is 0.02 percent of the total content of carbon in the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1510 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, and the pouring temperature is 1450 ℃.
Comparative example 3
The comparative example provides a smelting method of GH907 alloy tested in the research process, which comprises the following steps:
(1) heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1510 ℃ for smelting, wherein the smelting power is 700KW, adding a reclaimed material after the raw materials are completely smelted, smelting, wherein the mass of the reclaimed material is 45% of that of all the raw materials, and the smelting power after adding the reclaimed material is 1200 KW.
(2) Refining the smelted melt for 60min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1490 ℃, sampling and monitoring the content of oxygen and nitrogen in the alloy, wherein the standard of the content of oxygen and nitrogen in the melt is as follows: the content of oxygen is less than or equal to 20ppm, the content of nitrogen is less than or equal to 50ppm, if the content of oxygen in the melt is more than 20ppm, aluminum and carbon are added into the melt for deoxidation, the content of aluminum added into the melt accounts for 0.015 percent of the mass of the GH907 alloy, the content of carbon added into the melt accounts for 0.02 percent of the mass of the GH907 alloy, and if the content of nitrogen in the melt is more than 50ppm, vacuum denitrification is carried out. When the oxygen and nitrogen contents in the melt are qualified, adding metal aluminum, metal titanium and metal niobium into the melt, then alloying the melt, adding materials according to the requirements of chemical components in GH907 alloy and according to the analysis result, adjusting the components, wherein the alloying temperature is 1500 ℃, and adding metal manganese and ferroboron alloy into the melt after alloying.
(3) When the content of each chemical component in the melt meets the requirement of GH907 alloy, the molten steel is poured through a launder, and the pouring temperature is 1460 ℃.
Experimental example 1
GH907 alloy smelted in the examples and the comparative examples is made into GH907 alloy bars with the diameter of 250mm, the two ends of the GH907 alloy bars are subjected to performance tests of tensile strength and specified plastic elongation strength at 650 ℃ according to the GB/T4338-2006 metal material high-temperature tensile test method, and the test results are shown in the following table.
TABLE 1 mechanical Property test results
Experimental example 2
GH907 alloy smelted in the examples and the comparative examples is made into GH907 alloy bars with phi 250mm, and the performance test of thermal expansion characteristic parameters is respectively carried out on the GH907 alloy bars according to the measurement standard of the thermal expansion characteristic parameters of GB/T4339-2008 metal materials, and the test results are shown in the following table:
TABLE 2 expansion coefficient test results
The data in the table show that the smelting method of the GH907 alloy provided by the invention can enhance the tensile strength of the GH907 alloy, specify the plastic elongation strength and reduce the expansion coefficient of the GH907 alloy, and the smelting method of the GH907 alloy provided by the invention can improve the quality stability of the GH907 alloy and the performance level of the GH907 alloy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A smelting method of GH907 alloy is characterized by comprising the following steps:
step one, heating carbon, metallic nickel, refined steel, metallic cobalt and ferrosilicon to 1440-1480 ℃ for smelting, adding a reclaimed material after raw materials are completely molten, and smelting, wherein the reclaimed material is obtained by cleaning waste materials generated in the processing process of the GH907 alloy, and the mass of the reclaimed material is 30-50% of that of all raw materials;
refining the smelted melt for 55-65 min under the conditions that the vacuum degree is less than 5Pa and the temperature is 1480-1520 ℃, then carrying out deoxidation and denitrification operation, adding metal aluminum, metal titanium and metal niobium into the melt, then carrying out alloying treatment, and adding metal manganese and ferroboron alloy after the alloying treatment is finished;
and step three, pouring.
2. The method for smelting GH907 alloy according to claim 1, wherein: the chemical composition of the GH907 alloy is as follows: 0.02-0.035 wt%, Ni: 37-39 wt%, Cr: 0.05 to 0.5 wt%, Co: 13.7-14.8 wt%, Al: 0.03-0.15 wt%, Ti: 1.35-1.65 wt%, Nb + Ta: 4.5-4.9 wt%, Mn: 0.1-0.6 wt%, P < 0.003 wt%, Cu < 0.02 wt%, Mo < 0.02 wt%, B: 0.004 to 0.006 wt%, Si: 0.28-0.34 wt%, S less than 0.002 wt%, and Fe and inevitable impurity for the rest.
3. The method for smelting GH907 alloy according to claim 1, wherein: the method for cleaning the waste comprises the following steps: A. magnetic separation impurity removal, B wind blowing impurity removal, C spraying rough washing, D alkali liquor ultrasonic cleaning, E wind cutting drying, F sand washing operation, G sand material separation, H bubbling rinsing, I neutral drying, J wind cutting drying and K drying operation.
4. The method for smelting GH907 alloy according to claim 1, wherein: in the first step, the melting power for melting the carbon, the metal nickel, the refined steel, the metal cobalt and the ferrosilicon alloy is 400-1000 KW, and the melting power for melting the reclaimed materials is 1000-1400 KW.
5. The method for smelting GH907 alloy according to claim 1, wherein: in the first step, the addition amount of the carbon is two thirds of the total content of the carbon in the GH907 alloy.
6. The method for smelting GH907 alloy according to claim 1, wherein: in the second step, the deoxidation and denitrification are to reduce the oxygen content in the melt to be not more than 20ppm and reduce the nitrogen content in the melt to be not more than 50 ppm.
7. The method for smelting GH907 alloy according to claim 6, wherein: in the second step, the deoxidation is carried out by adding aluminum and carbon to the melt.
8. The method for smelting GH907 alloy according to claim 1, wherein: in the second step, the temperature of the alloying treatment is 1480-1520 ℃.
9. The method for smelting GH907 alloy according to claim 1, wherein: in the third step, the casting temperature is 1440-1460 ℃.
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