CN112981216A - Preparation method of nuclear power SA182F36 valve body forging - Google Patents
Preparation method of nuclear power SA182F36 valve body forging Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/005—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
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/42—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
- C22C38/46—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
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Forging (AREA)
Abstract
The invention discloses a preparation method of a nuclear power SA182F36 valve body forging. It comprises the following steps: (1) smelting, namely, proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot; 0.1 to 0.17 percent of C, 0.25 to 0.5 percent of Si, 0.8 to 1.2 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1 to 1.3 percent of Ni, less than or equal to 0.02 percent of V, 0.25 to 0.5 percent of Mo, less than or equal to 0.02 percent of N, 0.015 to 0.045 percent of Nb0.05 percent of Al, 0.5 to 0.8 percent of Cu0, and the balance of Fe; (2) forging; (3) rough machining; (4) and (4) quenching and tempering heat treatment. The nuclear power SA182F36 valve body forged piece prepared by the method can meet the requirement of a nuclear grade SA182F36 valve body forged piece of a 600MW demonstration fast reactor project, and can also meet the requirement after stress relief simulation treatment.
Description
Technical Field
The invention relates to the technical field of nuclear power manufacturing, in particular to a preparation method of a nuclear power SA182F36 valve body forging.
Background
The fusion of light atomic nucleus and the fission of heavy atomic nucleus can release energy, which are called nuclear fusion energy and nuclear fission energy respectively, and release a great deal of heat during fusion or fission, the energy is converted according to nuclear energy, mechanical energy and electric energy, and the electric power can be called nuclear power. Because a large amount of heat can be released during nuclear fusion or nuclear fission, a valve body forging applied to the nuclear power manufacturing technology needs to have high-temperature resistance.
SA182F36 in American ASME standard is substantially heat-resistant steel developed on the basis of German standard WB36, is widely applied to steam pipelines, valve bodies and the like in thermal power generating sets, and meets American standard ASME-2017SA182F36 without the requirement of 0 ℃ impact energy, but a 600MW demonstration fast reactor engineering nuclear-grade valve body has the requirement of 0 ℃ impact energy; therefore, the existing SA182F36 can not meet the requirement of China on 600MW demonstration fast reactor engineering nuclear-grade valve forgings and can not be applied to 600MW demonstration fast reactor engineering nuclear-grade valve bodies.
Disclosure of Invention
The invention aims to provide a preparation method of a nuclear power SA182F36 valve body forged piece, and aims to solve the technical problems that the existing SA182F36 cannot meet the requirements of China on 600MW demonstration fast reactor engineering nuclear-grade valve body forged pieces and cannot be applied to 600MW demonstration fast reactor engineering nuclear-grade valve bodies.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a preparation method of a nuclear power SA182F36 valve body forging, which comprises the following steps:
(1) smelting
Proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot;
0.1 to 0.17 percent of C, 0.25 to 0.5 percent of Si, 0.8 to 1.2 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1 to 1.3 percent of Ni, less than or equal to 0.02 percent of V, 0.25 to 0.5 percent of Mo, less than or equal to 0.02 percent of N, 0.015 to 0.045 percent of Nb, less than or equal to 0.05 percent of Al, 0.5 to 0.8 percent of Cu, and the balance of Fe;
(2) forging
B1, heating the steel ingot obtained in the step (1) in two sections through a gas heating furnace, wherein the temperature of the first section is less than or equal to 650 ℃, and preserving heat at the temperature for 0.6-0.8 minute according to the maximum thickness of the steel ingot per millimeter; the second section is 1200 plus or minus 20 ℃, the temperature is kept at the temperature, the heat preservation time is 0.6 to 0.8 minute per millimeter according to the maximum thickness of the steel ingot, and the first procedure is a pressing jaw after the heat preservation is finished; then returning to the furnace and heating to 1200 +/-20 ℃, preserving heat at the temperature for 0.6-0.8 min per millimeter according to the maximum thickness of the steel ingot, and then carrying out the second step: upsetting and drawing to a required size;
b2, forging, wherein the forging ratio is more than or equal to 5, the initial forging temperature is 1200 +/-20 ℃, the final forging temperature is more than or equal to 850 ℃, the air cooling temperature after forging is more than or equal to 500 ℃, and after forging, placing the forged blank into a furnace for pretreatment after normalizing and tempering forging to obtain a connected forged piece;
(3) roughing
Sawing the conjoined forged piece obtained in the step (2) into a single valve body forged piece;
(4) thermal treatment for hardening and tempering
D1, quenching, namely putting the valve body forged piece roughly processed in the step (3) into a heat treatment furnace, heating to 920 +/-10 ℃ at a heating rate of less than or equal to 220 ℃/h, preserving heat at the temperature for 2.9-3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then cooling with water to a temperature of less than or equal to 100 ℃;
d2, tempering, heating the valve body forged piece processed in the step D1 in a heat treatment furnace at a heating rate of less than or equal to 220 ℃/h to 650 +/-10 ℃, preserving heat at the temperature for 2.9-3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then air-cooling to room temperature to obtain a valve body forged piece finished product.
Further, in the step (1), the weight percentages of the chemical elements are respectively as follows: 0.12 to 0.15 percent of C, 0.3 to 0.4 percent of Si, 0.9 to 1.1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.1 to 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.35 to 0.45 percent of Mo, less than or equal to 0.02 percent of N, 0.025 to 0.035 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 to 0.7 percent of Cu, and the balance of Fe.
Further, in the step (1), the weight percentages of the chemical elements are respectively as follows: 0.12 percent of C, 0.35 percent of Si, 1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.4 percent of Mo, less than or equal to 0.02 percent of N, 0.03 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 percent of Cu and the balance of Fe.
Further, in the step (1), the smelting specifically comprises the following steps:
a1, mixing according to the weight percentage of chemical elements;
a2, entering an electric furnace, adding all ingredients in the step A1 into the electric furnace for smelting, sampling when the temperature of melting and cleaning is more than or equal to 1560 ℃, and entering an oxidation period when the decarburization quantity is more than or equal to 0.20%; the oxidation method adopted in the oxidation period is as follows: the oxidation temperature is more than or equal to 1560 ℃, oxygen blowing and decarburization are carried out, the decarburization quantity is more than or equal to 0.20 percent, the final carbon content is controlled to be 0.05 percent, the P content is less than or equal to 0.005 percent, and after slagging-off and tapping, the oxidizing slag is completely removed from the steel ladle again;
a3, feeding into an LF furnace, and adding 400Kg of lime, 150Kg of cap slag and 100Kg of deoxidizer per ton according to the total amount of the LF furnace in the refining process; keeping the white slag for more than or equal to 30 minutes, maintaining a strong reducing atmosphere, and continuously supplementing a deoxidizing agent, wherein the addition amount of the deoxidizing agent is 20-50Kg per ton according to the total amount of the current refining in the LF furnace; sampling, analyzing and controlling the components: according to the mass percentage, the content of C is 0.12 percent, the content of Si is 0.24 percent, the content of Mn is 1.10 percent, the content of Cr is 0.20 percent, the content of Mo is 0.43 percent, the content of Nb is 0.035 percent, the content of Cu is 0.55 percent, and the content of Ni is 1.20 percent; after the components are adjusted, vacuumizing for more than or equal to 30 minutes; feeding Al wire and Ca wire in the furnace during tapping; feeding Al wire to the content of 0.040%; feeding Ca wire 5 meters per ton according to the total amount of the current refining in the LF furnace; deslagging by 65-75%;
a4, feeding into a VD furnace, adding 1kg of Si-Ba-Ca line per ton according to the total refining amount of the VD furnace, vacuumizing, wherein the ultimate vacuum pressure is less than or equal to 67Pa, and the time is more than or equal to 12 min; the temperature of the hoisting ladle is 1585-1590 ℃;
a5, pouring, after weak argon blowing is finished, according to the total refining amount of a VD furnace, adding 1 kg/ton covering agent into a steel ladle, 1 kg/ton carbonized rice husk, pouring under the protection of argon, and pouring a ingot body: finishing within 7 minutes to 9 minutes; pouring a riser: completing the filling within 4-6 minutes; the pouring temperature is 1580-1585 ℃; and obtaining a steel ingot.
Further, in the step a1, the ingredients include ferroalloy, and the ferroalloy is subjected to high-temperature baking pretreatment after the ingredients are mixed.
Further, the pretreatment is to put the ferroalloy into a baking furnace to be heated to 750 ℃, and the temperature is maintained at 730-780 ℃ for at least 6 h.
Further, in the step a3, the deoxidizer is calcium powder.
Further, in the step A3, lime is added in two times, the first time of addition is that after the lime enters the LF furnace, the addition amount is 300Kg per ton according to the total refining amount of the LF furnace; the second addition is based on slagging effect, the addition amount is based on total amount of LF furnace, and lime is added in 100Kg per ton.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
according to the preparation method of the nuclear power SA182F36 valve body forged piece, the prepared nuclear power SA182F36 valve body forged piece can meet the requirement of a 600MW demonstration fast reactor engineering nuclear grade SA182F36 valve body forged piece, can also meet the requirement of a 600MW demonstration fast reactor engineering nuclear grade SA182F36 valve body forged piece after stress elimination simulation treatment, and can be applied to a 600MW demonstration fast reactor engineering nuclear grade valve body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
First, an embodiment
Example 1:
a preparation method of a nuclear power SA182F36 valve body forging comprises the following steps:
(1) smelting
Proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot;
0.12 percent of C, 0.35 percent of Si, 1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.4 percent of Mo, less than or equal to 0.02 percent of N, 0.03 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 percent of Cu and the balance of Fe;
the method comprises the following specific steps:
a1, mixing according to the weight percentage of chemical elements; the ingredients comprise ferroalloy, and the ferroalloy is subjected to high-temperature baking pretreatment after the ingredients are mixed, wherein the pretreatment is to put the ferroalloy into a baking furnace to be heated to 750 ℃, and keep the temperature at 750 ℃ for 7 hours;
a2, entering an electric furnace, adding all ingredients in the step A1 into the electric furnace for smelting, sampling when the temperature of melting and cleaning is more than or equal to 1560 ℃, and entering an oxidation period when the decarburization quantity is more than or equal to 0.20%; the oxidation method adopted in the oxidation period is as follows: the oxidation temperature is more than or equal to 1560 ℃, oxygen blowing and decarburization are carried out, the decarburization quantity is more than or equal to 0.20 percent, the final carbon content is controlled to be 0.05 percent, the P content is less than or equal to 0.005 percent, and after slagging-off and tapping, the oxidizing slag is completely removed from the steel ladle again;
a3, feeding into an LF furnace, and adding 400Kg of lime, 150Kg of cap slag and 100Kg of deoxidizer (calcium powder) per ton according to the total amount of the LF furnace in the refining process; adding lime twice, wherein the adding amount of lime for the first time is 300Kg per ton according to the total refining amount of the LF furnace after the lime enters the LF furnace; the second addition is based on slagging effect, the addition amount is based on total amount of LF furnace, and lime is added in 100Kg per ton. Keeping the white slag for more than or equal to 30 minutes, maintaining a strong reducing atmosphere, and continuously adding a deoxidizer (calcium powder), wherein the adding amount of the deoxidizer is 35Kg per ton according to the total amount of the current refining in the LF furnace; sampling, analyzing and controlling the components: according to the mass percentage, the content of C is 0.12 percent, the content of Si is 0.24 percent, the content of Mn is 1.10 percent, the content of Cr is 0.20 percent, the content of Mo is 0.43 percent, the content of Nb is 0.035 percent, the content of Cu is 0.55 percent, and the content of Ni is 1.20 percent; after alloy is added to adjust components, vacuumizing is carried out for more than or equal to 30 minutes; feeding Al wire and Ca wire in the furnace during tapping; feeding Al wire to the mass percentage content of 0.040%; feeding Ca wire 5 meters per ton according to the total amount of the current refining in the LF furnace; deslagging by 70%;
a4, feeding into a VD furnace, adding 1kg of Si-Ba-Ca line per ton according to the total refining amount of the VD furnace, vacuumizing, wherein the ultimate vacuum pressure is less than or equal to 67Pa, and the time is more than or equal to 12 min; the temperature of the hoisting ladle is 1588 ℃;
a5, pouring, after weak argon blowing is finished, according to the total refining amount of a VD furnace, adding 1 kg/ton covering agent into a steel ladle, 1 kg/ton carbonized rice husk, pouring under the protection of argon, and pouring a ingot body: completion in 8 minutes; pouring a riser: the filling was completed in 5 minutes; the pouring temperature is 1583 ℃; obtaining a steel ingot;
(2) forging
B1, heating the steel ingot obtained in the step (1) in two sections through a gas heating furnace, wherein the temperature of the first section is less than or equal to 650 ℃, and preserving heat at the temperature for 0.7 minute per millimeter according to the maximum thickness of the steel ingot; the second section is 1200, the temperature is kept at the temperature, the heat preservation time is 0.7 minute per millimeter according to the maximum thickness of the steel ingot, and the first procedure is pressing a jaw after the heat preservation is finished; then returning to the furnace and heating to 1200 ℃, preserving heat at the temperature for 0.7 min per millimeter according to the maximum thickness of the steel ingot, and then carrying out a second procedure: upsetting and drawing to a required size;
b2, forging, wherein the forging ratio is more than or equal to 5, the initial forging temperature is 1200 +/-20 ℃, the final forging temperature is more than or equal to 850 ℃, the air cooling temperature after forging is more than or equal to 500 ℃, and after forging, placing the forged blank into a furnace for pretreatment after normalizing and tempering forging to obtain a connected forged piece;
(3) roughing
Sawing the conjoined forged piece obtained in the step (2) into a single valve body forged piece;
(4) thermal treatment for hardening and tempering
D1, quenching, namely putting the valve body forged piece roughly processed in the step (3) into a heat treatment furnace, heating to 920 ℃ at a heating rate of 220 ℃/h, preserving heat at the temperature for 3 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then cooling with water until the temperature is less than or equal to 100 ℃;
d2, tempering, namely, putting the valve body forged piece processed in the step D1 into a heat treatment furnace, heating to 650 ℃ at a heating rate of 220 ℃/h, preserving heat at the temperature for 3 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then air cooling to room temperature to obtain a valve body forged piece finished product.
Example 2:
a preparation method of a nuclear power SA182F36 valve body forging comprises the following steps:
(1) smelting
Proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot;
0.1 percent of C, 0.5 percent of Si, 0.8 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1 percent of Ni, less than or equal to 0.02 percent of V, 0.5 percent of Mo, less than or equal to 0.02 percent of N, 0.015 percent of Nb, less than or equal to 0.05 percent of Al, 0.8 percent of Cu and the balance of Fe;
the method comprises the following specific steps:
a1, mixing according to the weight percentage of chemical elements; the ingredients comprise ferroalloy, and the ferroalloy is subjected to high-temperature baking pretreatment after the ingredients are mixed, wherein the pretreatment is to put the ferroalloy into a baking furnace to be heated to 750 ℃, and keep the temperature at 780 ℃ for 6 hours;
a2, entering an electric furnace, adding all ingredients in the step A1 into the electric furnace for smelting, sampling when the temperature of melting and cleaning is more than or equal to 1560 ℃, and entering an oxidation period when the decarburization quantity is more than or equal to 0.20%; the oxidation method adopted in the oxidation period is as follows: the oxidation temperature is more than or equal to 1560 ℃, oxygen blowing and decarburization are carried out, the decarburization quantity is more than or equal to 0.20 percent, the final carbon content is controlled to be 0.05 percent, the P content is less than or equal to 0.005 percent, and after slagging-off and tapping, the oxidizing slag is completely removed from the steel ladle again;
a3, feeding into an LF furnace, and adding 400Kg of lime, 150Kg of cap slag and 100Kg of deoxidizer (calcium powder) per ton according to the total amount of the LF furnace in the refining process; adding lime twice, wherein the adding amount of lime for the first time is 300Kg per ton according to the total refining amount of the LF furnace after the lime enters the LF furnace; the second addition is based on slagging effect, the addition amount is based on total amount of LF furnace, and lime is added in 100Kg per ton. Keeping the white slag for more than or equal to 30 minutes, maintaining a strong reducing atmosphere, and continuously adding a deoxidizer (calcium powder), wherein the adding amount of the deoxidizer is 20Kg per ton according to the total amount of the current refining in the LF furnace; sampling, analyzing and controlling the components: according to the mass percentage, the content of C is 0.12 percent, the content of Si is 0.24 percent, the content of Mn is 1.10 percent, the content of Cr is 0.20 percent, the content of Mo is 0.43 percent, the content of Nb is 0.035 percent, the content of Cu is 0.55 percent, and the content of Ni is 1.20 percent; after alloy is added to adjust components, vacuumizing is carried out for more than or equal to 30 minutes; feeding Al wire and Ca wire in the furnace during tapping; feeding Al wire to the mass percentage content of 0.040%; feeding Ca wire 5 meters per ton according to the total amount of the current refining in the LF furnace; deslagging by 65%;
a4, feeding into a VD furnace, adding 1kg of Si-Ba-Ca line per ton according to the total refining amount of the VD furnace, vacuumizing, wherein the ultimate vacuum pressure is less than or equal to 67Pa, and the time is more than or equal to 12 min; the temperature of the hoisting ladle is 1585 ℃;
a5, pouring, after weak argon blowing is finished, according to the total refining amount of a VD furnace, adding 1 kg/ton covering agent into a steel ladle, 1 kg/ton carbonized rice husk, pouring under the protection of argon, and pouring a ingot body: completion in 7 minutes; pouring a riser: the filling was completed in 4 minutes; the pouring temperature is 1585 ℃; obtaining a steel ingot;
(2) forging
B1, heating the steel ingot obtained in the step (1) in two sections through a gas heating furnace, wherein the temperature of the first section is less than or equal to 650 ℃, and preserving heat at the temperature for 0.8 minute per millimeter according to the maximum thickness of the steel ingot; the second section is 1180 ℃, the temperature is kept at the temperature, the heat preservation time is 0.8 minute per millimeter according to the maximum thickness of the steel ingot, and the first procedure is a pressing jaw after the heat preservation is finished; then returning to the furnace and heating to 1180 ℃, preserving heat at the temperature for 0.8 min per millimeter according to the maximum thickness of the steel ingot, and then performing a second step: upsetting and drawing to a required size;
b2, forging, wherein the forging ratio is more than or equal to 5, the initial forging temperature is 1200 +/-20 ℃, the final forging temperature is more than or equal to 850 ℃, the air cooling temperature after forging is more than or equal to 500 ℃, and after forging, placing the forged blank into a furnace for pretreatment after normalizing and tempering forging to obtain a connected forged piece;
(3) roughing
Sawing the conjoined forged piece obtained in the step (2) into a single valve body forged piece;
(4) thermal treatment for hardening and tempering
D1, quenching, namely putting the valve body forged piece roughly processed in the step (3) into a heat treatment furnace, heating to 910 ℃ at a heating rate of 180 ℃/h, preserving heat at the temperature for 3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then cooling with water to a temperature of less than or equal to 100 ℃;
d2, tempering, namely, putting the valve body forged piece processed in the step D1 into a heat treatment furnace, heating to 640 ℃ at a heating rate of 180 ℃/h, preserving heat at the temperature for 3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then air-cooling to room temperature to obtain a valve body forged piece finished product.
Example 3:
a preparation method of a nuclear power SA182F36 valve body forging comprises the following steps:
(1) smelting
Proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot;
0.17 percent of C, 0.25 percent of Si, 1.2 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.3 percent of Ni, less than or equal to 0.02 percent of V, 0.25 percent of Mo, less than or equal to 0.02 percent of N, 0.045 percent of Nb, less than or equal to 0.05 percent of Al, 0.5 percent of Cu, and the balance of Fe;
the method comprises the following specific steps:
a1, mixing according to the weight percentage of chemical elements; the ingredients comprise ferroalloy, and the ferroalloy is subjected to high-temperature baking pretreatment after the ingredients are mixed, wherein the pretreatment is to put the ferroalloy into a baking furnace to be heated to 750 ℃, and keep the temperature at 730 ℃ for 8 hours;
a2, entering an electric furnace, adding all ingredients in the step A1 into the electric furnace for smelting, sampling when the temperature of melting and cleaning is more than or equal to 1560 ℃, and entering an oxidation period when the decarburization quantity is more than or equal to 0.20%; the oxidation method adopted in the oxidation period is as follows: the oxidation temperature is more than or equal to 1560 ℃, oxygen blowing and decarburization are carried out, the decarburization quantity is more than or equal to 0.20 percent, the final carbon content is controlled to be 0.05 percent, the P content is less than or equal to 0.005 percent, and after slagging-off and tapping, the oxidizing slag is completely removed from the steel ladle again;
a3, feeding into an LF furnace, and adding 400Kg of lime, 150Kg of cap slag and 100Kg of deoxidizer (calcium powder) per ton according to the total amount of the LF furnace in the refining process; adding lime twice, wherein the adding amount of lime for the first time is 300Kg per ton according to the total refining amount of the LF furnace after the lime enters the LF furnace; the second addition is based on slagging effect, the addition amount is based on total amount of LF furnace, and lime is added in 100Kg per ton. Keeping the white slag for more than or equal to 30 minutes, maintaining a strong reducing atmosphere, and continuously adding a deoxidizer (calcium powder), wherein the adding amount of the deoxidizer is 50Kg per ton according to the total amount of the current refining in the LF furnace; sampling, analyzing and controlling the components: according to the mass percentage, the content of C is 0.12 percent, the content of Si is 0.24 percent, the content of Mn is 1.10 percent, the content of Cr is 0.20 percent, the content of Mo is 0.43 percent, the content of Nb is 0.035 percent, the content of Cu is 0.55 percent, and the content of Ni is 1.20 percent; after alloy is added to adjust components, vacuumizing is carried out for more than or equal to 30 minutes; feeding Al wire and Ca wire in the furnace during tapping; feeding Al wire to the mass percentage content of 0.040%; feeding Ca wire 5 meters per ton according to the total amount of the current refining in the LF furnace; pouring 75% of slag;
a4, feeding into a VD furnace, adding 1kg of Si-Ba-Ca line per ton according to the total refining amount of the VD furnace, vacuumizing, wherein the ultimate vacuum pressure is less than or equal to 67Pa, and the time is more than or equal to 12 min; the temperature of the crane ladle is 1590 ℃;
a5, pouring, after weak argon blowing is finished, according to the total refining amount of a VD furnace, adding 1 kg/ton covering agent into a steel ladle, 1 kg/ton carbonized rice husk, pouring under the protection of argon, and pouring a ingot body: completion in 9 minutes; pouring a riser: the filling was completed in 6 minutes; the pouring temperature is 1580 ℃; obtaining a steel ingot;
(2) forging
B1, heating the steel ingot obtained in the step (1) in two sections through a gas heating furnace, wherein the temperature of the first section is less than or equal to 650 ℃, and preserving heat at the temperature for 0.6 minute per millimeter according to the maximum thickness of the steel ingot; the second section is 1220 ℃, the temperature is kept at the temperature, the heat preservation time is 0.6 minute per millimeter according to the maximum thickness of the steel ingot, and the first procedure is a pressing jaw after the heat preservation is finished; then the steel ingot is put back to be heated to 1220 ℃, and the temperature is kept at the temperature, the temperature is kept for 0.6 minute per millimeter according to the maximum thickness of the steel ingot, and then the second procedure is carried out: upsetting and drawing to a required size;
b2, forging, wherein the forging ratio is more than or equal to 5, the initial forging temperature is 1200 +/-20 ℃, the final forging temperature is more than or equal to 850 ℃, the air cooling temperature after forging is more than or equal to 500 ℃, and after forging, placing the forged blank into a furnace for pretreatment after normalizing and tempering forging to obtain a connected forged piece;
(3) roughing
Sawing the conjoined forged piece obtained in the step (2) into a single valve body forged piece;
(4) thermal treatment for hardening and tempering
D1, quenching, namely putting the valve body forged piece roughly machined in the step (3) into a heat treatment furnace, heating to 930 ℃ at a heating rate of 200 ℃/h, preserving heat at the temperature for 2.9 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then cooling with water to a temperature of less than or equal to 100 ℃;
d2, tempering, namely, putting the valve body forged piece processed in the step D1 into a heat treatment furnace, heating to 660 ℃ at a heating rate of 200 ℃/h, preserving heat at the temperature for 2.9 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then air-cooling to room temperature to obtain a valve body forged piece finished product.
Example 4:
this example differs from example 1 in that:
the weight percentages of the chemical elements are respectively as follows: 0.12 percent of C, 0.4 percent of Si, 0.9 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.1 percent of Ni, less than or equal to 0.02 percent of V, 0.45 percent of Mo, less than or equal to 0.02 percent of N, 0.025 percent of Nb, less than or equal to 0.05 percent of Al, 0.7 percent of Cu and the balance of Fe;
the rest is the same as example 1.
Example 5:
this example differs from example 1 in that:
the weight percentages of the chemical elements are respectively as follows: 0.15 percent of C, 0.3 percent of Si, 1.1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.35 percent of Mo, less than or equal to 0.02 percent of N, 0.035 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 percent of Cu and the balance of Fe;
the rest is the same as example 1.
Secondly, performance detection and performance test
1. The conjoined forgings obtained after the forging step in examples 1-3 were tested for non-metallic inclusions.
The test results are shown in the following table 1 by adopting the ASTM E45-2018 standard:
TABLE 1 results of detection of non-metallic inclusions
| Example 1 | Example 2 | Example 3 | Index (I) | |
| Class A (sulfide) fine system | 0.5 | 0.5 | 0.5 | Not more than 1.5 grade |
| Crude A type (sulfide type) | Is not found | Is not found | Is not found | Not more than 1.5 grade |
| Class B (oxide) subclasses | 1.0 | 1.0 | 1.0 | Not more than 1.5 grade |
| Coarse system of B-type (oxides type) | 1.0 | 1.0 | 1.0 | Not more than 1.5 grade |
| Class C (silicates) fine system | Is not found | Is not found | 0.5 | Not more than 1.5 grade |
| Coarse series of C (silicates) | Is not found | 0.5 | 0.5 | Not more than 1.5 grade |
| Class D (cyclic oxide) subclasses | 1.0 | 1.0 | 1.0 | Not more than 1.5 grade |
| Coarse system of D (cyclic oxides) | 0.5 | 0.5 | 0.5 | Not more than 1.5 grade |
2. The valve body forgings prepared in examples 1 to 3 were subjected to a simulated stress relief test.
The valve body forgings prepared in examples 1 to 3 were placed in a heat treatment furnace for heat treatment, three samples were prepared for each example after the heat treatment, and then mechanical properties and impact tests were examined.
The heat treatment method comprises the following steps:
a temperature rising section: the temperature rise speed is less than or equal to 220 ℃/h within the range of 400-590 ℃;
a heat preservation section: the holding temperature is 590 ℃ plus or minus 10 ℃, and the holding time is as shown in Table 5.
A furnace cooling and temperature reducing section: the temperature is between 590 and 400 ℃, and the cooling speed is less than or equal to 220 ℃/h;
and cooling to room temperature, and performing mechanical property detection and impact test.
The mechanical property detection and the impact test both adopt the standard test method of ASTM A370-2015 steel product mechanical property test, and the detection results are shown in the following tables 2 and 3:
TABLE 2 mechanical properties of valve forgings after simulated stress relief test
TABLE 3 impact test results of valve forging after simulated stress relief test
As can be seen from tables 2, 3, 4 and 5, the nuclear power SA182F36 valve body forged piece prepared in embodiments 1 to 5 of the present invention can meet the requirements of the 600MW demonstration fast reactor engineering nuclear grade SA182F36 valve body forged piece, and after the simulated stress relief treatment, can also meet the requirements of the 600MW demonstration fast reactor engineering nuclear grade SA182F36 valve body forged piece; the simulated stress relief treatment in the experiment is actually simulated and relieved of welding stress, so that the mechanical property and the impact property of the SA182F36 valve body forged piece after welding in the using process can meet the requirements of 600MW demonstration fast reactor engineering nuclear grade SA182F36 valve body forged pieces.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A preparation method of nuclear power SA182F36 valve body forging is characterized by comprising the following steps: the method comprises the following steps:
(1) smelting
Proportioning and smelting according to the following chemical elements in percentage by weight to obtain a steel ingot;
0.1 to 0.17 percent of C, 0.25 to 0.5 percent of Si, 0.8 to 1.2 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1 to 1.3 percent of Ni, less than or equal to 0.02 percent of V, 0.25 to 0.5 percent of Mo, less than or equal to 0.02 percent of N, 0.015 to 0.045 percent of Nb, less than or equal to 0.05 percent of Al, 0.5 to 0.8 percent of Cu, and the balance of Fe;
(2) forging
B1, heating the steel ingot obtained in the step (1) in two sections through a gas heating furnace, wherein the temperature of the first section is less than or equal to 650 ℃, and preserving heat at the temperature for 0.6-0.8 minute according to the maximum thickness of the steel ingot per millimeter; the second section is 1200 plus or minus 20 ℃, the temperature is kept at the temperature, the heat preservation time is 0.6 to 0.8 minute per millimeter according to the maximum thickness of the steel ingot, and the first procedure is a pressing jaw after the heat preservation is finished; then returning to the furnace and heating to 1200 +/-20 ℃, preserving heat at the temperature for 0.6-0.8 min per millimeter according to the maximum thickness of the steel ingot, and then carrying out the second step: upsetting and drawing to a required size;
b2, forging, wherein the forging ratio is more than or equal to 5, the initial forging temperature is 1200 +/-20 ℃, the final forging temperature is more than or equal to 850 ℃, the air cooling temperature after forging is more than or equal to 500 ℃, and after forging, placing the forged blank into a furnace for pretreatment after normalizing and tempering forging to obtain a connected forged piece;
(3) roughing
Sawing the conjoined forged piece obtained in the step (2) into a single valve body forged piece;
(4) thermal treatment for hardening and tempering
D1, quenching, namely putting the valve body forged piece roughly processed in the step (3) into a heat treatment furnace, heating to 920 +/-10 ℃ at a heating rate of less than or equal to 220 ℃/h, preserving heat at the temperature for 2.9-3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then cooling with water to a temperature of less than or equal to 100 ℃;
d2, tempering, heating the valve body forged piece processed in the step D1 in a heat treatment furnace at a heating rate of less than or equal to 220 ℃/h to 650 +/-10 ℃, preserving heat at the temperature for 2.9-3.1 minutes per millimeter according to the maximum thickness of the valve body forged piece, and then air-cooling to room temperature to obtain a valve body forged piece finished product.
2. The preparation method of the nuclear power SA182F36 valve body forging of claim 1, characterized in that: in the step (1), the weight percentages of the chemical elements are respectively as follows: 0.12 to 0.15 percent of C, 0.3 to 0.4 percent of Si, 0.9 to 1.1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.1 to 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.35 to 0.45 percent of Mo, less than or equal to 0.02 percent of N, 0.025 to 0.035 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 to 0.7 percent of Cu, and the balance of Fe.
3. The preparation method of the nuclear power SA182F36 valve body forging of claim 2, wherein: in the step (1), the weight percentages of the chemical elements are respectively as follows: 0.12 percent of C, 0.35 percent of Si, 1 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.3 percent of Cr, 1.2 percent of Ni, less than or equal to 0.02 percent of V, 0.4 percent of Mo, less than or equal to 0.02 percent of N, 0.03 percent of Nb, less than or equal to 0.05 percent of Al, 0.6 percent of Cu and the balance of Fe.
4. The method for preparing the nuclear power SA182F36 valve body forging according to any one of claims 1-3, wherein the method comprises the following steps: in the step (1), the smelting comprises the following specific steps:
a1, mixing according to the weight percentage of chemical elements;
a2, entering an electric furnace, adding all ingredients in the step A1 into the electric furnace for smelting, sampling when the temperature of melting and cleaning is more than or equal to 1560 ℃, and entering an oxidation period when the decarburization quantity is more than or equal to 0.20%; the oxidation method adopted in the oxidation period is as follows: the oxidation temperature is more than or equal to 1560 ℃, oxygen blowing and decarburization are carried out, the decarburization quantity is more than or equal to 0.20 percent, the final carbon content is controlled to be 0.05 percent, the P content is less than or equal to 0.005 percent, and after slagging-off and tapping, the oxidizing slag is completely removed from the steel ladle again;
a3, feeding into an LF furnace, and adding 400Kg of lime, 150Kg of cap slag and 100Kg of deoxidizer per ton according to the total amount of the LF furnace in the refining process; keeping the white slag for more than or equal to 30 minutes, maintaining a strong reducing atmosphere, and continuously supplementing a deoxidizing agent, wherein the addition amount of the deoxidizing agent is 20-50Kg per ton according to the total amount of the current refining in the LF furnace; sampling, analyzing and controlling the components: according to the mass percentage, the content of C is 0.12 percent, the content of Si is 0.24 percent, the content of Mn is 1.10 percent, the content of Cr is 0.20 percent, the content of Mo is 0.43 percent, the content of Nb is 0.035 percent, the content of Cu is 0.55 percent, and the content of Ni is 1.20 percent; after the components are adjusted, vacuumizing for more than or equal to 30 minutes; feeding Al wire and Ca wire in the furnace during tapping; feeding Al wire to the content of 0.040%; feeding Ca wire 5 meters per ton according to the total amount of the current refining in the LF furnace; deslagging by 65-75%;
a4, feeding into a VD furnace, adding 1kg of Si-Ba-Ca line per ton according to the total refining amount of the VD furnace, vacuumizing, wherein the ultimate vacuum pressure is less than or equal to 67Pa, and the time is more than or equal to 12 min; the temperature of the hoisting ladle is 1585-1590 ℃;
a5, pouring, after weak argon blowing is finished, according to the total refining amount of a VD furnace, adding 1 kg/ton covering agent into a steel ladle, 1 kg/ton carbonized rice husk, pouring under the protection of argon, and pouring a ingot body: finishing within 7 minutes to 9 minutes; pouring a riser: completing the filling within 4-6 minutes; the pouring temperature is 1580-1585 ℃; and obtaining a steel ingot.
5. The preparation method of the nuclear power SA182F36 valve body forging of claim 4, wherein: in the step A1, the ingredients comprise ferroalloy, and the ferroalloy is subjected to high-temperature baking pretreatment after the ingredients are mixed.
6. The preparation method of the nuclear power SA182F36 valve body forging of claim 5, wherein: the pretreatment is to put the ferroalloy into a baking furnace to be heated to 750 ℃ and preserve heat for at least 6h at the temperature of 730-.
7. The preparation method of the nuclear power SA182F36 valve body forging of claim 4, wherein: in the step A3, the deoxidizer is calcium powder.
8. The preparation method of the nuclear power SA182F36 valve body forging of claim 4, wherein: in the step A3, lime is added twice, the first time of addition is that after the lime enters the LF furnace, the addition amount is 300Kg per ton according to the total refining amount of the LF furnace; the second addition is based on slagging effect, the addition amount is based on total amount of LF furnace, and lime is added in 100Kg per ton.
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| CN114959456A (en) * | 2022-04-29 | 2022-08-30 | 江油市长祥特殊钢制造有限公司 | Nuclear power SA182F91 valve body and preparation method thereof |
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