CN110000327B - Manufacturing process of heat shielding ring in nuclear turbine - Google Patents
Manufacturing process of heat shielding ring in nuclear turbine Download PDFInfo
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- CN110000327B CN110000327B CN201910183273.7A CN201910183273A CN110000327B CN 110000327 B CN110000327 B CN 110000327B CN 201910183273 A CN201910183273 A CN 201910183273A CN 110000327 B CN110000327 B CN 110000327B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
The invention discloses a manufacturing process of a heat shielding ring in a nuclear turbine, which comprises the following process steps: preparing a forging blank for forging → blanking → heating before forging → blank making → ring rolling → cooling after forging → rough turning → UT flaw detection → solution heat treatment → rough turning → UT flaw detection → fine turning. The manufacturing process of the heat shielding ring in the nuclear power turbine overcomes the technical difficulty of traditional forging, improves the quality of ring products, can save 10 to 15 percent of raw materials, saves energy, improves the production efficiency, meets the requirements of customers after heat treatment, and has the mechanical properties of: the tensile strength is more than or equal to 520MPa, the yield strength is more than or equal to 205MPa, the elongation is more than or equal to 40 percent, and the tensile test method is executed according to the related regulation of NB/T47010; the texture grain size of the forging piece is evaluated by a GB/T6394 evaluation method, and the austenite grain size level can reach more than 4.0 level.
Description
Technical Field
The invention relates to the field of ring piece forging, in particular to a manufacturing process of a heat shielding ring in a nuclear turbine.
Background
The nuclear turbine heat shielding ring forging is in a severe working environment and needs to bear multiple actions of high-temperature, high-pressure and high-corrosion media, so that the requirement on the forging is high. The 06Cr25Ni20 stainless steel is austenitic chromium nickel stainless steel and has good oxidation resistance and corrosion resistance, and because of the high percentage of chromium and nickel, the stainless steel has much better creep strength, can continuously work at high temperature and has good high temperature resistance. Because of high content of nickel (Ni) and chromium (Cr), the alloy has good oxidation resistance, corrosion resistance, acid and alkali resistance and high temperature resistance. Therefore, the nuclear turbine heat shielding ring manufactured by adopting 06Cr25Ni20 has wide market prospect.
However, 06Cr25Ni20 has poor high-temperature plasticity, great deformation resistance, easy cracking in the forging process and easy generation of coarse grain phenomenon, the existing forging technology level can not perfectly solve the problem, and the existing traditional 06Cr25Ni20 large-scale ring forging method mainly adopts free forging forming. In the forging process, because the forging temperature range is narrow, the cracking phenomenon is easy to generate, once the workpiece is cracked, the forging is stopped, and the production is continued after the cracked part of the workpiece is cut off, so that the time and the labor are wasted; the whole workpiece is scrapped due to the heavy weight. Therefore, the existing forging process has large forging allowance and is easy to generate coarse grain phenomenon, thereby not only wasting raw materials and energy, wasting working hours and having low production efficiency, but also causing uneven performance due to a large amount of subsequent processing.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the manufacturing process of the heat shielding ring in the nuclear turbine with high performance and the part size of phi 2910 +/-10 multiplied by phi 2735 +/-10 multiplied by 140 +/-10 mm is provided.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the manufacturing process of the heat shielding ring in the nuclear turbine is characterized in that: the process comprises the following steps: preparing forging blank for forging → blanking → heating before forging → blank making → ring rolling → cooling after forging → rough turning → UT flaw detection → solid solution heat treatment → rough turning → UT flaw detection → fine turning;
(1) the forging preparation step comprises: purchasing an electroslag ingot with the steel grade of 06Cr25Ni20 after electric furnace smelting and electroslag remelting, drawing and peeling the electroslag ingot to obtain a phi 500 forging rod for forging, wherein the chemical composition requirements of the forging rod are as follows: c: less than or equal to 0.08 percent, Mn: less than or equal to 2 percent, Si: less than or equal to 1.5 percent, P: less than or equal to 0.035%, S: less than or equal to 0.02 percent, Cr: 24-26%, Ni: 19-22%, Mo: less than or equal to 0.5 percent, Cu: less than or equal to 0.5 percent, and the balance being Fe;
(2) in the blanking process: the size of the blank obtained by blanking is as follows: phi 500 (1025 + -10) mm;
(3) in the heating process before forging: during charging, the blank obtained by blanking is placed in the middle of a heating furnace, carbon steel or alloy steel is placed around the blank to prevent the phenomena of severe peroxidation, element depletion and grain coarsening caused by the fact that flame directly contacts the bar, and meanwhile, a layer of asbestos is laid on the surface of the blank to protect the blank from being directly sprayed by the flame; when the blank is charged, the temperature in the furnace is less than or equal to 100 ℃, the furnace is heated after charging is completed, the temperature in the furnace is raised to 850 +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is preserved for 3-4 h, then the heating is continued, the temperature in the furnace is raised to 1110 +/-10 ℃ at the speed of less than or equal to 150 ℃/h, and then the temperature is preserved for 1-2 h;
(4) in the blank making procedure: 4-1, firstly, upsetting the blank to phi 750 x (443 +/-10) mm, and beginning forging at the temperature of 1055 +/-3 ℃; then drawing the blank to phi 690 x (614 +/-10) mm, then pressing the blank to 556 +/-10 mm in height, and controlling the finish forging temperature to 882 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 4-2, adopting two phi 200 punches to punch the blind holes from the upper end face and the lower end face of the blank simultaneously, then turning the blank and lightly pressing the excircle to take out the two phi 200mm punches, wherein the initial forging temperature is 998 +/-3 ℃; then changing two phi 250mm punches to punch simultaneously to ream the punched two blind holes, then overturning the blank to lightly press the excircle to take out the two phi 250mm punches, wherein the pressing amount of each time when the phi 250mm punches are punched is 2-3 cm, the initial forging temperature is 970 +/-3 ℃, and the final forging temperature is 850 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 4-3, pressing the height of the blank to 472 +/-10 mm, wherein the initial forging temperature is 1025 +/-3 ℃; then changing a punch with the diameter of 350mm to punch a through hole on the punched blind hole, wherein the initial forging temperature is 994 +/-3 ℃;
(5) in the ring rolling procedure: 5-1, expanding the through hole to phi 500mm by a blank ring rolling machine, wherein the initial forging temperature is 963 +/-3 ℃; then pressing the height of the blank to 446 +/-10 mm, wherein the terminal temperature is 860 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 5-2, pressing the height of the blank to 346 +/-10 mm, wherein the initial forging temperature is 1077 +/-3 ℃, and the final forging temperature is 900 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 5-3, performing first-fire rolling on the blank by using a ring rolling machine until the height of the ring piece is 170 +/-10 mm, wherein the initial forging temperature is 1107 +/-3 ℃, and the final forging temperature is 900 +/-3 ℃;
(6) and in the cooling process after forging: immediately cooling the ring piece by water within 3min after ring rolling, and controlling the water temperature to be 15-25 ℃;
(7) in the solution heat treatment process: when the ring piece is charged, the temperature in the furnace is less than or equal to 200 ℃, the furnace is heated after charging is completed, the temperature in the furnace is increased to 850 ℃ +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is kept for 2.5-3.5 h, then the heating is continued, the temperature in the furnace is increased to 1080 ℃ +/-10 ℃ at the temperature increase speed of not less than 300 ℃, and then the temperature is kept for 1-2 h; and then taking the ring out of the furnace for water cooling, wherein the water temperature is controlled to be 15-25 ℃.
Further, in the manufacturing process of the heat shielding ring in the nuclear turbine, the following steps are performed: the chemical composition of the forged rod is required as follows: c: 0.04-0.08%, Mn: 1.5-2%, Mo: 0.3 to 0.5 percent.
Further, in the manufacturing process of the heat shielding ring in the nuclear turbine, the following steps are performed: and 5-3, in the ring rolling process, the temperature of the ring piece can be obviously increased, and the temperature of the ring piece is reduced without stopping watering to prevent the crystal grains from rapidly expanding.
The invention has the advantages that: the manufacturing process of the heat shielding ring in the nuclear power turbine overcomes the technical difficulty of traditional forging, improves the quality of ring products, saves 10-15% of raw materials, saves energy, improves the production efficiency, meets the requirements of customers after heat treatment, and has the following mechanical properties: the tensile strength is more than or equal to 520MPa, the yield strength is more than or equal to 205MPa, the elongation is more than or equal to 40 percent, and the tensile test method is executed according to the related regulation of NB/T47010; the texture grain size of the forging piece is evaluated by a GB/T6394 evaluation method, and the austenite grain size level can reach more than 4.0 level.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The part size of the heat shielding ring to be manufactured in this embodiment is phi 2918 x phi 2740 x 145 mm.
The manufacturing process of the heat shielding ring in the nuclear turbine comprises the following process steps: preparing forging blank for forging → blanking → heating before forging → blank making → ring rolling → cooling after forging → rough turning → UT flaw detection → solid solution heat treatment → rough turning → UT flaw detection → fine turning;
(1) the forging preparation step comprises: purchasing an electroslag ingot with the steel grade of 06Cr25Ni20 after electric furnace smelting and electroslag remelting, drawing and peeling the electroslag ingot to obtain a phi 500 forging rod for forging, wherein the chemical composition requirements of the forging rod are as follows: c: 0.04-0.08%, Mn: 1.5-2%, Si: less than or equal to 1.5 percent, P: less than or equal to 0.035%, S: less than or equal to 0.02 percent, Cr: 24-26%, Ni: 19-22%, Mo: 0.3 to 0.5%, Cu: less than or equal to 0.5 percent, and the balance being Fe; after the smelting technology of 'electric furnace smelting + electroslag remelting' and the subsequent forging rod rolling technology are adopted for raw materials, the purity and the density of the raw materials can be improved, the problem of cracking of steel ingots is solved, and the cost is effectively reduced;
(2) in the blanking process: the size of the blank obtained by blanking is as follows: phi 500X 1032 mm;
(3) in the heating process before forging: during charging, the blank obtained by blanking is placed in the middle of a heating furnace, alloy steel is placed around the heating furnace, the phenomena of severe peroxidation, element depletion and grain coarsening caused by the fact that flame directly contacts the bar stock are prevented, and meanwhile, a layer of asbestos is laid on the surface of the blank to protect the blank from being directly sprayed by the flame; when the blank is charged, the temperature in the furnace is less than or equal to 100 ℃, the furnace is heated after charging is finished, the temperature in the furnace is raised to 850 +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is preserved for 3.5h, then the heating is continued, the temperature in the furnace is raised to 1110 +/-10 ℃ at the speed of less than or equal to 150 ℃/h, and then the temperature is preserved for 1.5 h; by adopting a surrounding type forging heating process, flame is prevented from directly contacting the blank, local overheating and even overburning are effectively prevented, node temperature control ensures that the heating time of the blank in each link is reasonable and effective, and crystal grains are prevented from being overlarge;
(4) in the blank making procedure: 4-1, firstly, upsetting the blank to phi 750 multiplied by 450mm, and controlling the initial forging temperature to 1055 +/-3 ℃; then drawing the blank to phi 690 multiplied by 620mm, then pressing the blank to 560mm in height, and the finish forging temperature is 882 +/-3 ℃; then, the blank is returned to the furnace and is insulated for 20min, and the insulation temperature is 1110 +/-10 ℃; 4-2, adopting two phi 200 punches to punch the blind holes from the upper end face and the lower end face of the blank simultaneously, then turning the blank and lightly pressing the excircle to take out the two phi 200mm punches, wherein the initial forging temperature is 998 +/-3 ℃; then changing two phi 250mm punches to simultaneously punch and ream the punched blind hole, then overturning the blank to lightly press the excircle and taking out the two phi 250mm punches, wherein the pressing amount of the phi 250mm punches is 2-3 cm each time, the pressing amount in the process must be controlled, the inner hole of the blank is cracked due to overlarge pressing amount, after reaming is finished, overturning the blank to lightly press the excircle and taking out the phi 250mm punches, the initial forging temperature is 970 +/-3 ℃, and the final forging temperature is 850 +/-3 ℃; then, the blank is returned to the furnace and is insulated for 20min, and the insulation temperature is 1110 +/-10 ℃; 4-3, pressing the height of the blank to 480mm, wherein the initial forging temperature is 1025 +/-3 ℃; then changing a punch with the diameter of 350mm to punch a through hole on the punched blind hole, wherein the initial forging temperature is 994 +/-3 ℃; the blank-making forging ratio of the press is more than 6, so that the structure is more compact; the relay punching is adopted to pre-punch holes in the process of hole expansion, and the through holes are punched by direct punching, so that the blanks are prevented from cracking in the process of punching;
(5) in the ring rolling procedure: 5-1, expanding the through hole to phi 500mm by a blank ring rolling machine, wherein the initial forging temperature is 963 +/-3 ℃; then pressing the height of the blank to 450mm, wherein the terminal temperature is 860 +/-3 ℃; then, the blank is returned to the furnace and is subjected to heat preservation for 20min, and the heat preservation temperature is 1110 +/-10 ℃; 5-2, pressing the height of the blank to 350mm, wherein the initial forging temperature is 1077 +/-3 ℃, the final forging temperature is 900 +/-3 ℃, and the quality of ring rolling can be influenced by overhigh height of the blank, so that the difficulty of ring rolling is increased; then, the blank is returned to the furnace and is subjected to heat preservation for 20min, and the heat preservation temperature is 1110 +/-10 ℃; 5-3, rolling the blank on a ring rolling machine by using one fire until the size of the ring piece is phi 2950 multiplied by phi 2708 multiplied by 177mm, the initial forging temperature is 1107 +/-3 ℃, the final forging temperature is 900 +/-3 ℃, the temperature of the ring piece can be obviously increased in the ring rolling process, and the temperature of the ring piece is reduced without stopping watering to prevent the rapid expansion of crystal grains; the ring rolling machine is formed by one fire, so that impurities are effectively crushed and crystal grains are refined, the working time is saved, and the energy consumption is reduced;
(6) and in the cooling process after forging: immediately cooling the ring piece within 3min after ring rolling, wherein crystal grains are coarse due to slow cooling in the forging piece, and the water temperature is controlled to be 15-25 ℃;
(7) roughly turning to remove the surface defects of the ring piece;
(8) performing UT flaw detection on the ring piece;
(9) in the solution heat treatment process: when the ring piece is charged, the temperature in the furnace is less than or equal to 200 ℃, the furnace is heated after charging is finished, the temperature in the furnace is increased to 850 +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is kept for 3h, then the heating is continued, the temperature in the furnace is increased to 1080 +/-10 ℃ at the temperature increase speed of not less than 300 ℃, and then the temperature is kept for 1.5 h; then, discharging the ring piece out of the furnace, and carrying out water cooling, wherein the water temperature is controlled to be 15-25 ℃;
(10) roughly turning to remove the surface defects of the ring piece;
(11) performing UT flaw detection on the ring piece;
(12) the ring is finish turned to dimensions phi 2918 x phi 2740 x 145 mm.
Claims (3)
1. The manufacturing process of the heat shielding ring in the nuclear turbine is characterized in that: the process comprises the following steps: preparing forging blank for forging → blanking → heating before forging → blank making → ring rolling → cooling after forging → rough turning → UT flaw detection → solid solution heat treatment → rough turning → UT flaw detection → fine turning;
(1) the forging preparation step comprises: purchasing an electroslag ingot with the steel grade of 06Cr25Ni20 after electric furnace smelting and electroslag remelting, drawing and peeling the electroslag ingot to obtain a phi 500 forging rod for forging, wherein the requirements of chemical components of the forging rod on mass percentage are as follows: c: less than or equal to 0.08 percent, Mn: less than or equal to 2 percent, Si: less than or equal to 1.5 percent, P: less than or equal to 0.035%, S: less than or equal to 0.02 percent, Cr: 24-26%, Ni: 19-22%, Mo: less than or equal to 0.5 percent, Cu: less than or equal to 0.5 percent, and the balance being Fe;
(2) in the blanking process: the size of the blank obtained by blanking is as follows: phi 500mm x (1025 + -10) mm;
(3) in the heating process before forging: during charging, the blank obtained by blanking is placed in the middle of a heating furnace, carbon steel or alloy steel is placed around the blank to prevent the phenomena of severe peroxidation, element depletion and grain coarsening caused by the fact that flame directly contacts the bar, and meanwhile, a layer of asbestos is laid on the surface of the blank to protect the blank from being directly sprayed by the flame; when the blank is charged, the temperature in the furnace is less than or equal to 100 ℃, the furnace is heated after charging is completed, the temperature in the furnace is raised to 850 +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is preserved for 3-4 h, then the heating is continued, the temperature in the furnace is raised to 1110 +/-10 ℃ at the speed of less than or equal to 150 ℃/h, and then the temperature is preserved for 1-2 h;
(4) in the blank making procedure: 4-1, firstly, upsetting the blank to be phi 750mm multiplied by (443 +/-10) mm, and beginning forging at the temperature of 1055 +/-3 ℃; then drawing the blank to phi 690mm x (614 +/-10) mm, then pressing the blank to 556 +/-10 mm in height, and controlling the finish forging temperature to 882 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 4-2, adopting two punch heads with the diameter of 200mm to punch the blind holes from the upper end surface and the lower end surface of the blank at the same time, then turning the blank and lightly pressing the excircle to take out the two punch heads with the diameter of 200mm, wherein the initial forging temperature is 998 +/-3 ℃; then changing two phi 250mm punches to punch simultaneously to ream the punched two blind holes, then overturning the blank to lightly press the excircle to take out the two phi 250mm punches, wherein the pressing amount of each time when the phi 250mm punches are punched is 2-3 cm, the initial forging temperature is 970 +/-3 ℃, and the final forging temperature is 850 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 4-3, pressing the height of the blank to 472 +/-10 mm, wherein the initial forging temperature is 1025 +/-3 ℃; then changing a punch with the diameter of 350mm to punch a through hole on the punched blind hole, wherein the initial forging temperature is 994 +/-3 ℃;
(5) in the ring rolling procedure: 5-1, expanding the through hole to phi 500mm by a blank ring rolling machine, wherein the initial forging temperature is 963 +/-3 ℃; then pressing the height of the blank to 446 +/-10 mm, wherein the terminal temperature is 860 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 5-2, pressing the height of the blank to 346 +/-10 mm, wherein the initial forging temperature is 1077 +/-3 ℃, and the final forging temperature is 900 +/-3 ℃; then, returning the blank to the furnace and preserving heat for 20 +/-3 min; 5-3, performing first-fire rolling on the blank by using a ring rolling machine until the height of the ring piece is 170 +/-10 mm, wherein the initial forging temperature is 1107 +/-3 ℃, and the final forging temperature is 900 +/-3 ℃;
(6) and in the cooling process after forging: immediately cooling the ring piece by water within 3min after ring rolling, and controlling the water temperature to be 15-25 ℃;
(7) in the solution heat treatment process: when the ring piece is charged, the temperature in the furnace is less than or equal to 200 ℃, the furnace is heated after charging is completed, the temperature in the furnace is increased to 850 ℃ +/-10 ℃ at the speed of less than or equal to 100 ℃/h, then the temperature is kept for 2.5-3.5 h, then the heating is continued, the temperature in the furnace is increased to 1080 ℃ +/-10 ℃ at the temperature increase speed of not less than 300 ℃, and then the temperature is kept for 1-2 h; and then taking the ring out of the furnace for water cooling, wherein the water temperature is controlled to be 15-25 ℃.
2. The process for manufacturing the heat shield ring in the nuclear turbine according to claim 1, wherein: the forged rod comprises the following chemical components in percentage by mass: c: 0.04-0.08%, Mn: 1.5-2%, Mo: 0.3 to 0.5 percent.
3. A process for manufacturing a heat shield ring in a nuclear turbine according to claim 1 or 2, characterized in that: and 5-3, in the ring rolling process, the temperature of the ring piece can be obviously increased, and the temperature of the ring piece is reduced without stopping watering to prevent the crystal grains from rapidly expanding.
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| JP2011079043A (en) * | 2009-10-09 | 2011-04-21 | Mitsubishi Materials Corp | Method of manufacturing annular molding, and annular molding |
| EP2626152A1 (en) * | 2012-02-13 | 2013-08-14 | PSM, Inc. | Method of manufacturing flange for wind towers using ring rolling method |
| CN105543632A (en) * | 2015-12-28 | 2016-05-04 | 合肥中澜新材料科技有限公司 | Preparation method of high-strength roller bearing outer ring |
| CN107866665A (en) * | 2017-10-10 | 2018-04-03 | 张家港中环海陆特锻股份有限公司 | Million MW class nuclear power generating sets high intensity retaining ring manufacturing process |
| CN107779694A (en) * | 2017-10-30 | 2018-03-09 | 山东伊莱特重工股份有限公司 | A kind of 6082 aluminium alloy flange manufacture crafts |
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