CN116497275A - Heat-resistant steel casting and heat treatment method thereof - Google Patents
Heat-resistant steel casting and heat treatment method thereof Download PDFInfo
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- CN116497275A CN116497275A CN202310434827.2A CN202310434827A CN116497275A CN 116497275 A CN116497275 A CN 116497275A CN 202310434827 A CN202310434827 A CN 202310434827A CN 116497275 A CN116497275 A CN 116497275A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 136
- 239000010959 steel Substances 0.000 title claims abstract description 136
- 238000005266 casting Methods 0.000 title claims abstract description 117
- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000137 annealing Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 239000006104 solid solution Substances 0.000 claims abstract description 5
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 48
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 23
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000005255 carburizing Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a heat-resistant steel casting and a heat treatment method thereof, wherein the heat-resistant steel casting comprises the following components: 0.05-0.08 wt%, si:0.5-1.2 wt%, mn:1.7-2.1w%, P:0.03-0.033w%, S:0.01-0.03 wt%, ni:24.0-27.5 wt%, cr:12.5-15.0 wt%, mo:0.8-1.3w%, V:0.1-0.3 wt%, ti:1.75-2.0 wt%, al:0.1-0.35 wt%, B:0.001-0.005W%; the heat treatment steps of the heat-resistant steel casting are as follows: s1: preparing materials; s2: solid solution; s3: and (3) recrystallizing and annealing; s4: stress relief tempering; s5: cleaning; s6: and (5) stabilizing treatment. The invention can fully separate out carbide in the heat-resistant steel base material, ensures the performance of steel, has excellent high temperature resistance and is more beneficial to practical use.
Description
Technical Field
The invention relates to the technical field of heat-resistant steel, in particular to a heat-resistant steel casting and a heat treatment method thereof.
Background
Heat-resistant steel refers to alloy steel having high strength and good chemical stability at high temperatures. It includes two kinds of oxidation-resistant steel and heat-resistant steel. Oxidation resistant steels generally require better chemical stability but are subjected to lower loads. The hot strength steel requires higher high temperature strength and corresponding oxidation resistance. Heat resistant steels are commonly used in the manufacture of components for boilers, steam turbines, power machinery, industrial furnaces and parts operating at high temperatures in the aviation, petrochemical and other industrial sectors. These components are required to have sufficient toughness, good workability and weldability, and a certain structural stability, in addition to high-temperature strength and high-temperature oxidation corrosion resistance, depending on the application.
After massive search, the prior art is found that: publication number CN110640086a discloses a forging method of heat-resistant steel, comprising the following steps: heating the metal mold to 1650 ℃ by using a resistance heater, and electrically connecting a temperature sensor and a singlechip on the metal mold, wherein the singlechip controls the resistance heater to enable the metal mold to be in a constant temperature state of 1650 ℃ by controlling the input voltage and current of the resistance heater according to signals of the temperature sensor; heating heat-resistant steel in a heating furnace, monitoring the temperature of the heat-resistant steel in real time by using an infrared thermometer, pouring heat-resistant steel juice into a metal mold when the temperature of the heat-resistant steel reaches 1620 ℃, and controlling a resistance heater to stop heating the metal mold by a singlechip while pouring the heat-resistant steel juice into the metal mold; the heat resistant steel casting was then removed from the metal mold after cooling the heat resistant steel to 850 ℃. The aim of improving the strength of the heat-resistant steel is fulfilled.
In summary, in the existing casting process of the heat-resistant steel, the carbide mixed in the heat-resistant steel substrate determines the application temperature range of the heat-resistant steel, so that the heat-resistant steel cannot cope with the temperature range higher than the application temperature range in the casting process, and further the problem that the performance of the heat-resistant steel is not convenient to improve in a reprocessing mode, namely, the carbide in the heat-resistant steel cannot be sufficiently precipitated in a traditional processing mode, and further the performance of the heat-resistant steel is limited is caused.
Disclosure of Invention
The invention aims to provide a heat-resistant steel casting and a heat treatment method thereof, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a heat-resistant steel casting and a heat treatment method thereof, wherein the heat-resistant steel casting comprises the following components: 0.05-0.08 wt%, si:0.5-1.2 wt%, mn:1.7-2.1w%, P:0.03-0.033w%, S:0.01-0.03 wt%, ni:24.0-27.5 wt%, cr:12.5-15.0 wt%, mo:0.8-1.3w%, V:0.1-0.3 wt%, ti:1.75-2.0 wt%, al:0.1-0.35 wt%, B:0.001-0.005W%.
Preferably, the heat-resistant steel casting is obtained by adopting 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel as a base material and casting.
Preferably, the heat treatment steps of the heat-resistant steel casting are as follows:
s1: preparing materials;
s2: solid solution;
s3: and (3) recrystallizing and annealing;
s4: stress relief tempering;
s5: cleaning;
s6: and (5) stabilizing treatment.
Preferably, in S1 based on the heat treatment step of the heat-resistant steel casting:
detecting a heat-resistant steel casting formed by casting 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel before preparing materials, measuring the hardness of the heat-resistant steel casting at room temperature, wherein the hardness is more than or equal to 200HRW, placing the heat-resistant steel casting in a heating furnace, heating in three stages, and raising the temperature of one stage from room temperature to 300 ℃; the two stages are raised from 300 ℃ to 600 ℃; the temperature is increased to 950 ℃ from 600 ℃ in three stages, the heating duration is 3h, and the heating interval time is 30min.
Preferably, in S2 based on the heat treatment step of the heat-resistant steel casting:
and (3) preserving the heat of the heat-resistant steel casting at 950-1000 ℃ for 1-2 hours, and fully dissolving carbide in the heat-resistant steel casting to obtain a single austenite structure.
Preferably, in S3 based on the heat treatment step of the heat-resistant steel casting:
and (3) placing the heat-resistant steel casting subjected to heat preservation in a carburizing heating furnace for annealing treatment, wherein the annealing environment is methanol and ammonia gas as the protection environment, and the recrystallization annealing temperature is 820-850 ℃.
Preferably, in S3 based on the heat treatment step of the heat-resistant steel casting: the input amount of methanol is 20-35d/min, and the input amount of ammonia gas is 0.1L/h.
Preferably, in S4 based on the heat treatment step of the heat-resistant steel casting:
and (3) carrying out stress relief tempering on the annealed heat-resistant steel casting, controlling the heating temperature to be between 700 and 750 ℃, and preserving the heat for 2 to 3 hours, wherein methanol and ammonia are adopted as the protective environment, the input amount of the methanol is 20 to 40d/min, and the input amount of the ammonia is 0.15L/h.
Preferably, in S5 based on the heat treatment step of the heat-resistant steel casting:
after stress relief tempering, the temperature of the heat-resistant steel casting is measured, when the difference between the surface temperature of the heat-resistant steel casting and the room temperature is less than 50 ℃, the heat-resistant steel casting is cooled in a circulating water cooling mode, the surface of the heat-resistant steel casting is cleaned in a cooling process, the surface of the heat-resistant steel casting is pressed in a punching mode in the cleaning process, and the punching feeding amount is less than 2cm, so that carbide precipitation is accelerated.
Preferably, in S6 based on the heat treatment step of the heat-resistant steel casting:
and (3) placing the heat-resistant steel casting after the cleaning in a heating furnace again, raising the temperature of the heating furnace to 830-880 ℃, preserving heat for 5 hours, reducing the temperature of the heat-resistant steel casting in a natural cooling mode after the heat preservation is finished, and performing overall cooling again in a water spray cooling mode when the temperature is reduced to 300 ℃.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, aiming at the member obtained by casting the heat-resistant steel as the base material, carbide in the heat-resistant steel can be precipitated in a mode of carrying out deepening treatment again, so that the overall performance of the heat-resistant steel is improved, the carbide is precipitated through subsequent processing when the heat-resistant steel casting takes the heat-resistant steel base material with the traditional specification as the raw material, the practical performance of the heat-resistant steel casting obtained after processing can be better than that of the heat-resistant steel base material, and the defect that the heat resistance of the heat-resistant steel cannot be improved through the subsequent processing means in actual application is overcome.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Two embodiments provided by the present invention:
embodiment one:
a heat-resistant steel casting and a heat treatment method thereof, wherein the heat-resistant steel casting comprises the following components: 0.05-0.08 wt%, si:0.5-1.2 wt%, mn:1.7-2.1w%, P:0.03-0.033w%, S:0.01-0.03 wt%, ni:24.0-27.5 wt%, cr:12.5-15.0 wt%, mo:0.8-1.3w%, V:0.1-0.3 wt%, ti:1.75-2.0 wt%, al:0.1-0.35 wt%, B:0.001-0.005W%.
The heat-resistant steel casting is obtained by taking 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel as a base material and casting.
The heat treatment steps of the heat-resistant steel casting are as follows:
s1: preparing materials, namely detecting a heat-resistant steel casting formed by casting 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel before preparing materials, measuring the hardness of the heat-resistant steel casting at room temperature, wherein the hardness is more than or equal to 200HRW, placing the heat-resistant steel casting in a heating furnace, heating the heat-resistant steel casting in three stages, and raising the temperature of the first stage from room temperature to 300 ℃; the two stages are raised from 300 ℃ to 600 ℃; the temperature is increased to 950 ℃ from 600 ℃ in three stages, the heating duration is 3h, and the heating interval time is 30min;
s2: carrying out solid solution, and carrying out heat preservation on the heat-resistant steel casting at 950-1000 ℃ for 1-2 hours, so as to fully dissolve carbide in the heat-resistant steel casting and obtain a single austenite structure;
s3: recrystallizing and annealing, namely placing the heat-resistant steel casting subjected to heat preservation in a carburizing heating furnace for annealing treatment, wherein the annealing environment is methanol and ammonia gas as the protective environment, the temperature of the recrystallization annealing is 820-850 ℃, the input amount of the methanol is 20-35d/min, and the input amount of the ammonia gas is 0.1L/h;
s4: stress-relieving tempering, namely stress-relieving tempering the annealed heat-resistant steel casting, controlling the heating temperature to 700-750 ℃, and preserving heat for 2-3 hours, wherein methanol and ammonia are adopted as the protective environment, the input amount of the methanol is 20-40d/min, and the input amount of the ammonia is 0.15L/h;
s5: after stress relief tempering, determining the temperature of the heat-resistant steel casting, cooling the heat-resistant steel casting by adopting a circulating water cooling mode when the difference between the surface temperature of the heat-resistant steel casting and the room temperature is less than 50 ℃, cleaning the surface of the heat-resistant steel casting in the cooling process, pressing the surface of the heat-resistant steel casting in a punching mode in the cleaning process, and ensuring that the punching inlet is less than 2cm for accelerating the precipitation of carbide;
s6: and (3) stabilizing, namely placing the heat-resistant steel casting after the cleaning is finished in a heating furnace again, raising the temperature of the heating furnace to 830-880 ℃, preserving the heat for 5 hours, reducing the temperature of the heat-resistant steel casting in a natural cooling mode after the heat preservation is finished, and fully cooling in a water spray cooling mode when the temperature is reduced to 300 ℃.
Embodiment two:
the components of the heat-resistant steel casting are C:0.65W%, si:0.66W%, mn:1.42W%, P:0.02W%, S:0.014W%, ni:25.2W%, cr:14.8W%, mo:1.26W%, V:0.2W%, ti:1.9w%, al:0.18W%, B:0.004W%.
The heat-resistant steel casting is obtained by taking 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel as a base material and casting.
The heat treatment steps of the heat-resistant steel casting are as follows:
s1: preparing materials, namely detecting a heat-resistant steel casting formed by casting 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel before preparing materials, measuring the hardness of the heat-resistant steel casting at room temperature, wherein the hardness is more than or equal to 200HRW, placing the heat-resistant steel casting in a heating furnace, heating the heat-resistant steel casting in three stages, and raising the temperature of the first stage from room temperature to 300 ℃; the two stages are raised from 300 ℃ to 600 ℃; the temperature is increased to 950 ℃ from 600 ℃ in three stages, the heating duration is 3h, and the heating interval time is 30min;
s2: carrying out solid solution, and carrying out heat preservation on the heat-resistant steel casting at 980 ℃ for 1.5 hours, so as to fully dissolve carbide in the heat-resistant steel casting and obtain a single austenite structure;
s3: recrystallizing and annealing, namely placing the heat-resistant steel casting subjected to heat preservation in a carburizing heating furnace for annealing treatment, wherein the annealing environment is methanol and ammonia gas as the protection environment, the temperature of the recrystallization annealing is 850 ℃, the input amount of the methanol is 30d/min, and the input amount of the ammonia gas is 0.1L/h;
s4: stress-relieving tempering, namely stress-relieving tempering the annealed heat-resistant steel casting, controlling the heating temperature to be reduced to 720 ℃, preserving heat for 3 hours, adopting methanol and ammonia as the protective environment, wherein the input amount of the methanol is 35d/min, and the input amount of the ammonia is 0.15L/h;
s5: after stress relief tempering, determining the temperature of the heat-resistant steel casting, cooling the heat-resistant steel casting by adopting a circulating water cooling mode when the difference between the surface temperature of the heat-resistant steel casting and the room temperature is less than 50 ℃, cleaning the surface of the heat-resistant steel casting in the cooling process, pressing the surface of the heat-resistant steel casting in a punching mode in the cleaning process, and ensuring that the punching inlet is less than 2cm for accelerating the precipitation of carbide;
s6: stabilizing, namely placing the heat-resistant steel casting after cleaning into a heating furnace again, raising the temperature of the heating furnace to 850 ℃, preserving heat for 5 hours, reducing the temperature of the heat-resistant steel casting in a natural cooling mode after preserving heat, and fully cooling again in a water spray cooling mode when reducing the temperature to 300 DEG C
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A heat resistant steel casting, characterized by: the heat-resistant steel casting comprises the following components: 0.05-0.08 wt%, si:0.5-1.2 wt%, mn:1.7-2.1w%, P:0.03-0.033w%, S:0.01-0.03 wt%, ni:24.0-27.5 wt%, cr:12.5-15.0 wt%, mo:0.8-1.3w%, V:0.1-0.3 wt%, ti:1.75-2.0 wt%, al:0.1-0.35 wt%, B:0.001-0.005W%.
2. A heat resistant steel casting according to claim 1, wherein: the heat-resistant steel casting is obtained by taking 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel as a base material and casting.
3. A heat treatment method of heat-resistant steel castings according to claims 1 and 2, characterized in that: the heat treatment steps of the heat-resistant steel casting are as follows:
s1: preparing materials;
s2: solid solution;
s3: and (3) recrystallizing and annealing;
s4: stress relief tempering;
s5: cleaning;
s6: and (5) stabilizing treatment.
4. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S1 based on the heat treatment step of the heat-resistant steel casting:
detecting a heat-resistant steel casting formed by casting 0Cr15Ni25Ti2MoAIVB high-temperature alloy steel before preparing materials, measuring the hardness of the heat-resistant steel casting at room temperature, wherein the hardness is more than or equal to 200HRW, placing the heat-resistant steel casting in a heating furnace, heating in three stages, and raising the temperature of one stage from room temperature to 300 ℃; the two stages are raised from 300 ℃ to 600 ℃; the temperature is increased to 950 ℃ from 600 ℃ in three stages, the heating duration is 3h, and the heating interval time is 30min.
5. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S2 based on the heat treatment step of the heat-resistant steel casting:
and (3) preserving the heat of the heat-resistant steel casting at 950-1000 ℃ for 1-2 hours, and fully dissolving carbide in the heat-resistant steel casting to obtain a single austenite structure.
6. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S3 based on the heat treatment step of the heat-resistant steel casting:
and (3) placing the heat-resistant steel casting subjected to heat preservation in a carburizing heating furnace for annealing treatment, wherein the annealing environment is methanol and ammonia gas as the protection environment, and the recrystallization annealing temperature is 820-850 ℃.
7. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S3 based on the heat treatment step of the heat-resistant steel casting: the input amount of methanol is 20-35d/min, and the input amount of ammonia gas is 0.1L/h.
8. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S4 based on the heat treatment step of the heat-resistant steel casting:
and (3) carrying out stress relief tempering on the annealed heat-resistant steel casting, controlling the heating temperature to be between 700 and 750 ℃, and preserving the heat for 2 to 3 hours, wherein methanol and ammonia are adopted as the protective environment, the input amount of the methanol is 20 to 40d/min, and the input amount of the ammonia is 0.15L/h.
9. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S5 based on the heat treatment step of the heat-resistant steel casting:
after stress relief tempering, the temperature of the heat-resistant steel casting is measured, when the difference between the surface temperature of the heat-resistant steel casting and the room temperature is less than 50 ℃, the heat-resistant steel casting is cooled in a circulating water cooling mode, the surface of the heat-resistant steel casting is cleaned in a cooling process, the surface of the heat-resistant steel casting is pressed in a punching mode in the cleaning process, and the punching feeding amount is less than 2cm, so that carbide precipitation is accelerated.
10. A heat treatment method of a heat-resistant steel casting according to claim 3, characterized in that: in S6 based on the heat treatment step of the heat-resistant steel casting:
and (3) placing the heat-resistant steel casting after the cleaning in a heating furnace again, raising the temperature of the heating furnace to 830-880 ℃, preserving heat for 5 hours, reducing the temperature of the heat-resistant steel casting in a natural cooling mode after the heat preservation is finished, and performing overall cooling again in a water spray cooling mode when the temperature is reduced to 300 ℃.
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