CN113441679A - Casting method of heat-resistant steel casting - Google Patents
Casting method of heat-resistant steel casting Download PDFInfo
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- CN113441679A CN113441679A CN202110589201.XA CN202110589201A CN113441679A CN 113441679 A CN113441679 A CN 113441679A CN 202110589201 A CN202110589201 A CN 202110589201A CN 113441679 A CN113441679 A CN 113441679A
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- 238000005266 casting Methods 0.000 title claims abstract description 193
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004321 preservation Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 239000004576 sand Substances 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000003068 static effect Effects 0.000 claims description 3
- 230000035882 stress Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The application relates to a casting method of a heat-resistant steel casting, which comprises the following steps: smelting heat-resistant steel, and detecting components of the molten steel after smelting; pouring the molten steel into a product sand mold; simulating the cooling condition of the casting in the sand mold to obtain the cooling speed of the casting and the temperature difference of each part; controlling the cooling condition of the casting in the sand mold according to the cooling speed of the casting and the temperature difference of each part; taking out the casting from the sand mold, cleaning sand and other impurities in the inner cavity and the outer cavity of the casting, and cutting off a pouring channel of the casting; annealing the casting with the dead head at high temperature, and then carrying out sufficient heat preservation; cutting a riser and a patch of the casting; and (4) sequentially carrying out normalizing treatment and tempering treatment on the casting. The scheme can solve the problem that the mechanical property of the heat-resistant steel casting is difficult to ensure by the conventional casting method.
Description
Technical Field
The invention relates to the technical field of casting methods, in particular to a casting method of a heat-resistant steel casting.
Background
The improvement of steam parameters is one of main means for improving the power generation efficiency of the thermal power generating unit, and under the condition that other conditions are the same, the higher the steam parameters are, and the more effective the steam parameters are, and the more effective the steam parameters are, the more effective the steam parameters are, and the more effective the steam parameters are, the more effective the higher the steam parameters are, and the more effective the higher the steam parameters are, the higher the more effective the more the higher the more the higher the more the steam parameters are, the more the steam parameters are, the more the steam parameters are, the more the steam parameters are. The development of materials is the key for restricting the improvement of unit parameters.
At present, steam temperature parameters of a thermal power generating unit are mainly 600 ℃/623 ℃, and manufacturers of steam turbine units at home and abroad strive to improve the steam parameters of the thermal power generating unit so as to improve the generating efficiency of the thermal power generating unit. The mature materials used, such as heat resistant steels like SA335, P92, have not been able to meet the use of higher parameter power plant projects. Therefore, at present, research and development are being carried out at home and abroad on materials with the temperature of 630-650 ℃ and even higher, such as ultra-supercritical steam turbine generator units, so that materials with excellent structural stability, durable strength and better high-temperature durable strength are required.
The materials have more tungsten and cobalt contents, contain boron which is very easy to oxidize, and have higher nitrogen content, so that the casting of the materials has great difficulty in processes such as smelting, pouring, post-boxing, cutting, heat treatment and the like in the casting production process, and the casting formed by casting is easy to crack, low in performance and low in yield, thereby preventing the successful application of the materials in the field of steel castings and preventing the development of domestic thermal power equipment to the high-end field.
Disclosure of Invention
In view of this, it is necessary to provide a method for casting a heat-resistant steel casting, which addresses the problem that it is difficult for the conventional casting method to ensure the mechanical properties of the heat-resistant steel casting.
In order to solve the problems, the invention adopts the following technical scheme:
the embodiment of the invention discloses a casting method of a heat-resistant steel casting, which comprises the following steps:
smelting heat-resistant steel, and detecting components of the molten steel after smelting;
pouring the molten steel into a product sand mold;
simulating the cooling condition of the casting in the sand mold to obtain the cooling speed of the casting and the temperature difference of each part;
controlling the cooling condition of the casting in the sand mold according to the cooling speed of the casting and the temperature difference of each part;
taking out the casting from the sand mold, cleaning sand and other impurities in the inner cavity and the outer cavity of the casting, and cutting off a pouring channel of the casting;
annealing the casting with the dead head at high temperature, and then carrying out sufficient heat preservation;
cutting a riser and a patch of the casting;
and (4) sequentially carrying out normalizing treatment and tempering treatment on the casting.
In one embodiment, the annealing at high temperature and then the sufficient heat preservation of the dead-head casting specifically include:
and (3) annealing the casting with the riser in a heat treatment furnace at a high temperature, wherein the annealing temperature rise speed is less than or equal to 40 ℃/h, heating to 1180-1220 ℃ for heat preservation, and the heat preservation time is sufficient according to 2-3 minutes per millimeter of the casting.
In one embodiment, after the high temperature annealing and then the sufficient heat preservation of the dead-headed casting, the casting method further comprises:
and slowly cooling the casting in the furnace at a cooling speed of less than or equal to 30 ℃/h until the maximum temperature of the casting reaches 500-600 ℃, and then preserving heat for 4-8 hours.
In one embodiment, the heat resistant steel has a heat resistant temperature of 630 ℃ to 650 ℃.
In one embodiment, the furnace temperature of the heat treatment furnace is first raised to 100 ℃ to 300 ℃ before the castings are normalized.
In one embodiment, the temperature of the casting is maintained at 300 ℃ or more, and then the casting is subjected to normalizing treatment in a heat treatment furnace.
In one embodiment, the temperature in the furnace is heated to 1120 ℃ to 1170 ℃ for a hold time sufficient to hold the casting for a period of 1.5 to 2.5 minutes per millimeter of casting while normalizing the casting.
In one embodiment, after the heat preservation is finished, the casting is cooled by a fan.
In one embodiment, tempering the casting specifically comprises:
heating the casting to 730-760 ℃ at a heating rate of less than or equal to 40 ℃/h for heat preservation, wherein the heat preservation time is sufficient according to the time of 2-2.5 minutes per millimeter of the casting.
After the heat preservation is finished, the casting is slowly cooled in the furnace at the cooling speed of less than or equal to 30 ℃/h, the casting is taken out of the furnace after the highest temperature of the casting is less than 200 ℃, and then the casting is continuously cooled in static air.
In one embodiment, the maximum temperature of the surface of the casting is cooled to less than 80 ℃ prior to normalizing the casting.
The technical scheme adopted by the invention can achieve the following beneficial effects:
according to the casting method of the heat-resistant steel casting, disclosed by the embodiment of the invention, the processes of pouring, pouring channel cutting, riser and patching cutting, subsequent positive tempering and the like of the casting are carried out, so that the normal-temperature mechanical property and the high-temperature mechanical property indexes of the heat-resistant steel casting can meet the technical requirements. By the casting method, particularly in the aspect of heat treatment technology, the application of the heat-resistant steel in the field of steel castings is realized, so that domestic thermal power equipment can be developed to the high-end field. Meanwhile, the casting method reduces the difficulty of the heat-resistant steel in casting, and solves the problems that a heat-resistant steel casting is easy to crack, has low performance and low yield.
Drawings
Is free of
Detailed Description
The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention discloses a casting method of a heat-resistant steel casting, which specifically comprises the following steps:
s100, smelting the heat-resistant steel, and detecting components of the molten steel after smelting.
The heat-resistant steel is smelted by adopting a specific smelting process. After the molten steel is smelted, detecting the components of the smelted molten steel to ensure the qualified rate of the molten steel.
And S200, pouring the molten steel into a product sand mold.
S300, simulating the cooling condition of the casting in the sand mold to obtain the cooling speed of the casting and the temperature difference of each part.
Preferably, MAGMA casting simulation software can be used to simulate the cooling of the casting in the sand mold so that the relevant parameters can be more easily obtained.
And S400, controlling the cooling condition of the casting in the sand mold according to the cooling speed of the casting and the temperature difference of each part.
S500, the casting is lifted out of the sand mold, sand and other impurities in the inner cavity and the outer cavity of the casting are removed, and a pouring channel of the casting is cut off.
Adopt flame cutting torch cutting to fall the runner of foundry goods, notice during the cutting cut seam apart from the foundry goods body distance at least 50mm to 80mm, can avoid like this that the cutting in-process, the heat transfer of cutting to the foundry goods body causes the different position temperature differences of foundry goods to produce thermal stress on the foundry goods, local stress concentration probably leads to the foundry goods to produce the crackle.
S600, carrying out high-temperature annealing on the casting with the riser, and then carrying out sufficient heat preservation.
Because the valve bodies of the thermal power generating units are large, the diameters of casting risers on the valve bodies are correspondingly large, the thick risers need to be cut off from castings, the stress is large, and the castings with fragile as-cast structures can easily generate large cracks. Therefore, the casting with a riser is firstly put into a heat treatment furnace for high-temperature annealing so as to fully and uniformly soften the as-cast structure, improve the component segregation of the casting and eliminate the as-cast stress.
And S700, cutting a riser of the casting and patching.
And S800, sequentially carrying out normalizing treatment and tempering treatment on the casting.
From the above, in the casting method of the heat-resistant steel casting disclosed in the embodiment of the present invention, the normal temperature mechanical property and the high temperature mechanical property index of the heat-resistant steel casting can both meet the technical requirements by the processes of casting, pouring gate cutting, riser and patch cutting, and then positive tempering. By the casting method, particularly in the aspect of heat treatment technology, the application of the heat-resistant steel in the field of steel castings is realized, so that domestic thermal power equipment can be developed to the high-end field. Meanwhile, the casting method reduces the difficulty of the heat-resistant steel in casting, and solves the problems that a heat-resistant steel casting is easy to crack, has low performance and low yield.
Further, step S600 may specifically include:
and (3) annealing the casting with the riser in a heat treatment furnace at high temperature, wherein the annealing temperature rise speed can be less than or equal to 40 ℃/h, heating to 1180-1220 ℃ for heat preservation, and the heat preservation time can be enough heat preservation for 2-3 minutes per millimeter of the casting. The mode can ensure that the as-cast structure of the casting is fully and uniformly softened, the composition segregation of the casting is improved, and the as-cast stress is eliminated, so that the subsequent cutting of a riser and a patch and the mechanical property of the casting are facilitated.
After the casting with a riser is subjected to high-temperature annealing and then sufficient heat preservation, the casting method disclosed by the embodiment of the invention can further comprise the following steps:
and slowly cooling the casting in the furnace at a cooling speed of less than or equal to 30 ℃/h until the maximum temperature of the casting reaches 500-600 ℃, and then preserving heat for 4-8 hours. The temperature difference between the surface and the core of the thick wall and the thin wall of the casting is small due to the heat preservation, so that the residual stress of the casting is small, the casting is taken out of the furnace for cutting a riser and a patch, the stress of the casting is reduced, and the casting is prevented from cracking easily when the riser and the patch are cut off.
In the embodiment of the invention, the heat-resistant temperature of the heat-resistant steel can be 630-650 ℃. Under the condition, the heat-resistant steel has excellent structure stability and lasting strength at the temperature section, so that the mechanical property of the formed casting is ensured.
In the embodiment disclosed by the invention, before normalizing treatment is carried out on the casting, the temperature in the heat treatment furnace can be firstly increased to 100-300 ℃. So that the temperature difference between the temperature of the casting and the temperature in the furnace is smaller, the cooling of the casting can be slowed down, the temperature difference of different parts of the casting is reduced, and the subsequent normalizing treatment is facilitated.
Furthermore, the temperature of the casting can be kept to be more than or equal to 300 ℃, and then the casting is subjected to normalizing treatment in a heat treatment furnace, so that the normalizing treatment is facilitated.
In the implementation of the invention, when the casting is normalized, the temperature in the furnace can be heated to 1120-1170 ℃ for heat preservation, and the heat preservation time can be sufficient according to the time of 1.5-2.5 minutes per millimeter of the casting. Under the condition, the uniformity of casting crystal grains can be ensured, and various alloy elements and compounds thereof can be easily dissolved in austenite, so that the subsequent solid solution strengthening, precipitation strengthening and dislocation strengthening effects of the casting are ensured, and the normal-temperature mechanical property and the high-temperature mechanical property of the casting can be improved.
After the heat preservation is finished, the casting can be cooled by adopting a fan. Specifically, after heat preservation, the foundry goods is taken out of the furnace, arranges some industrial fans around the foundry goods, and the power of fan can be for 11KW to 22KW, then carries out the forced air cooling to the foundry goods to guarantee that the whole cooling that can be even quick of foundry goods.
In the embodiment of the present invention, the tempering treatment of the casting specifically may include:
heating the casting to 730-760 ℃ at a heating rate of less than or equal to 40 ℃/h for heat preservation, wherein the heat preservation time is sufficient according to the time of 2-2.5 minutes per millimeter of the casting.
After the heat preservation is finished, the casting is slowly cooled in the furnace at the cooling speed of less than or equal to 30 ℃/h, the casting is taken out of the furnace after the highest temperature of the casting is less than 200 ℃, and then the casting is continuously cooled in static air.
Through the tempering, the normalizing residual stress of the casting is eliminated, the due effect of tempering precipitation strengthening is exerted, the original quenched martensite of the casting is sufficiently tempered, and a relatively stable tempered martensite structure is formed, so that the normal-temperature mechanical property and the high-temperature mechanical property of the casting are both considered.
In the embodiment of the invention, before the casting is subjected to normalizing treatment, the highest temperature of the surface of the casting can be cooled to be less than 80 ℃, so that the casting is conveniently loaded into a heat treatment furnace for tempering and stress relief.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A casting method of a heat-resistant steel casting, characterized by comprising:
smelting heat-resistant steel, and detecting components of the molten steel after smelting;
pouring the molten steel into a product sand mold;
simulating the cooling condition of the casting in the sand mold to obtain the cooling speed of the casting and the temperature difference of each part;
controlling the cooling condition of the casting in the sand mold according to the cooling speed of the casting and the temperature difference of each part;
taking out the casting from the sand mold, cleaning sand and other impurities in the inner cavity and the outer cavity of the casting, and cutting off a pouring channel of the casting;
annealing the casting with the dead head at high temperature, and then carrying out sufficient heat preservation;
cutting a riser and a patch of the casting;
and (4) sequentially carrying out normalizing treatment and tempering treatment on the casting.
2. The method for casting a heat-resistant steel casting according to claim 1, wherein the hot-headed casting is annealed at a high temperature and then sufficiently insulated, specifically comprising:
and (3) annealing the casting with the riser in a heat treatment furnace at a high temperature, wherein the annealing temperature rise speed is less than or equal to 40 ℃/h, heating to 1180-1220 ℃ for heat preservation, and the heat preservation time is sufficient according to 2-3 minutes per millimeter of the casting.
3. The casting method of heat resistant steel castings according to claim 1, characterized in that after the high temperature annealing of the dead-headed castings and then the sufficient heat preservation, the casting method further comprises:
and slowly cooling the casting in the furnace at a cooling speed of less than or equal to 30 ℃/h until the maximum temperature of the casting reaches 500-600 ℃, and then preserving heat for 4-8 hours.
4. A casting method of a heat-resistant steel casting according to claim 1, characterized in that the heat-resistant temperature of the heat-resistant steel is 630 ℃ to 650 ℃.
5. A casting method of a heat-resistant steel casting according to claim 1, characterized in that the furnace temperature of the heat treatment furnace is first raised to 100 ℃ to 300 ℃ before the casting is subjected to the normalizing treatment.
6. A casting method of a heat-resistant steel casting according to claim 5, characterized in that the casting temperature is maintained at 300 ℃ or higher, and then subjected to normalizing treatment in a heat treatment furnace.
7. A casting method of a heat-resistant steel casting according to claim 1, characterized in that, in normalizing the casting, the temperature in the furnace is heated to 1120 ℃ to 1170 ℃ for holding for a sufficient holding time of 1.5 to 2.5 minutes per mm of the casting.
8. The casting method of a heat-resistant steel casting according to claim 7, characterized in that after the heat preservation is finished, the casting is cooled by a fan.
9. A casting method of a heat-resistant steel casting according to claim 1, characterized in that the tempering treatment of the casting specifically includes:
heating the casting to 730-760 ℃ at a heating rate of less than or equal to 40 ℃/h for heat preservation, wherein the heat preservation time is sufficient according to the time of 2-2.5 minutes per millimeter of the casting.
After the heat preservation is finished, the casting is slowly cooled in the furnace at the cooling speed of less than or equal to 30 ℃/h, the casting is taken out of the furnace after the highest temperature of the casting is less than 200 ℃, and then the casting is continuously cooled in static air.
10. A casting method of a heat-resistant steel casting according to claim 1, characterized in that the maximum temperature of the surface of the casting is cooled to less than 80 ℃ before the casting is subjected to the normalizing treatment.
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| CN202110589201.XA CN113441679A (en) | 2021-05-28 | 2021-05-28 | Casting method of heat-resistant steel casting |
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| CN202110589201.XA CN113441679A (en) | 2021-05-28 | 2021-05-28 | Casting method of heat-resistant steel casting |
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| CN101956055A (en) * | 2010-10-19 | 2011-01-26 | 钢铁研究总院 | Heat treatment method of large-diameter thick-walled heat-resistant steel pipe |
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| US20180099329A1 (en) * | 2016-10-10 | 2018-04-12 | Quaker City Castings | Metal Castings Including Integral Separately Fabricated Components |
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| CN111604496A (en) * | 2020-05-29 | 2020-09-01 | 西安工业大学 | Investment casting process for heat-resistant steel connecting pipe shell |
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2021
- 2021-05-28 CN CN202110589201.XA patent/CN113441679A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086497A (en) * | 2009-12-04 | 2011-06-08 | 沈阳鑫火铸造有限公司 | Method for preparing high-Cr high-Ni oxidation-resistant heat-resistant steel formwork |
| CN101956055A (en) * | 2010-10-19 | 2011-01-26 | 钢铁研究总院 | Heat treatment method of large-diameter thick-walled heat-resistant steel pipe |
| CN105420454A (en) * | 2015-12-15 | 2016-03-23 | 共享铸钢有限公司 | Heat treatment method for large heat-resisting high alloy steel castings |
| US20180099329A1 (en) * | 2016-10-10 | 2018-04-12 | Quaker City Castings | Metal Castings Including Integral Separately Fabricated Components |
| CN110039003A (en) * | 2019-05-30 | 2019-07-23 | 安徽应流集团霍山铸造有限公司 | A kind of manufacturing method of large size martensitic stain less steel casting |
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