Production method of SA-533 Gr. BCL.1 composite board for nuclear power
Through the smelting, rolling and heat treatment processes of SA-533 Gr.BCL.1 composite plates, the problem of buckling risk in composite plate production was solved, and the mechanical properties of the steel plates were made to meet standards and mass production was achieved.
Patent Information
- Application Number
- CN202510894404.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-09-30
AI Technical Summary
During the production process of composite plates, uneven thermal stress caused by material differences can easily cause the steel plates to warp, resulting in difficulties in tapping and equipment damage, affecting production efficiency.
The three-layer structure of SA-533 Gr.BCL.1 base steel plate, 304 stainless steel and Q355B steel plate is composited. Through specific smelting, rolling and heat treatment processes, including die casting, heating, rolling, composite and heat treatment, the risk of warping is controlled to ensure that the mechanical properties of the steel plate meet the standards.
Effectively control the risk of buckling, ensure that the yield strength, tensile strength and impact performance of the steel plate meet the design requirements, realize mass production, and avoid equipment damage and production impact.
Smart Images
Figure BDA0005475730820000071 
Figure BDA0005475730820000081
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of SA-533 Gr.BCL.1 composite plate for nuclear power. Background Art
[0002] SA-533 Gr.BCL.1 is an American standard pressure vessel steel plate designed specifically for nuclear power projects and other high-temperature and high-pressure environments. It has high strength, excellent toughness and good welding properties, making it a core material in the fields of nuclear power, petrochemicals, energy, and is especially irreplaceable in the manufacture of nuclear power pressure vessels. Its application range extends from key equipment in nuclear reactors to various types of high-pressure vessels, demonstrating a high degree of compatibility between material design and industrial needs. Currently, composite plates are often used in industry to meet certain performance requirements. Composite plates are prone to thermal stress due to material differences (SA533, 304 stainless steel, low-alloy steel), and uneven heating and cooling rates can easily cause the steel plate to warp, resulting in difficulties in tapping and jamming of the quenching machine. It is necessary to optimize the welding method of the composite plates, pay close attention to the tapping and quenching process, effectively control the risk of warping, avoid damage to equipment, and affect production. Summary of the Invention
[0003] The present invention provides a production method of SA-533 Gr.BCL.1 composite panels for nuclear power, which effectively controls the risk of warping, avoids damage to equipment and affects production.
[0004] The technical solution of the present invention:
[0005] A method for producing SA-533 Gr.BCL.1 composite panels for nuclear power plants comprises the following steps:
[0006] (1) Smelting process; (2) Die casting process; (3) Heating process; (4) Rolling process: Ingot slab rolling, slab finished product rolling: In the first stage, the starting rolling temperature is 1050-1150℃, the final rolling temperature is 900-980℃, the longitudinal rolling single pass reduction is 20-35mm, the widening reduction is 15-25mm; the steel thickness is 130mm; In the second stage, the starting rolling temperature is 850-870℃, the final rolling temperature is 820-850℃; (5) Composite plate: base steel plate + composite 304 stainless steel + welded steel plate, three-layer structure; (6) Heat treatment process.
[0007] Preferably, (1) smelting process: during the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. Argon blowing is maintained well throughout the process, the refining white slag holding time is greater than 30 minutes, the total LF refining time is greater than 55 minutes, S≤0.003%, vacuum degree 15-70Pa, vacuum holding time 15-20 minutes, and soft blowing for 6-10 minutes.
[0008] Preferably, in step (2) the die casting process: a 23.5-37.5 ton ingot is selected for smelting.
[0009] Preferably, in step (3), the steel ingot is peeled and cleaned on both sides before heating, and the surface cleaning quality is inspected piece by piece. The obtained steel ingot is heated in a soaking furnace according to the Group II steel heating process, and the heating temperature is 1230℃~1280℃.
[0010] Preferably, step (4) rolling process: 7 passes of rolling in stage II, entering ACC controlled cooling after rolling, the temperature before entering the water is 800-840℃, the red-return temperature is 620-650℃, and the steel plate is stacked in time when the surface temperature of the steel plate reaches 200-350℃, and the stacking time is ≥24 hours.
[0011] Preferably, in step (5), the composite plate is produced by quenching and tempering the base steel plate, and then the lower surface is composited with 304 stainless steel, and then a Q355B steel plate is welded to the composite surface, and the composite plate is re-quenched and tempered;
[0012] The base steel plate is SA-533 Gr.BCL.1 base steel plate.
[0013] Preferably, in step (6) heat treatment process: the base steel plate and the composite steel plate adopt a quenching + tempering heat treatment process;
[0014] Quenching: 900℃±10℃, PLC+20min, through hardening; tempering: 680℃±10℃, 4.0-4.5min / mm;
[0015] To ensure the heating effect, the burner integrity rate is above 95%, the quenching machine water temperature is ≤30℃, and the steel plate is heated evenly from head to tail; the steel plates are tempered at intervals, and the steel loading interval is 30min / plate.
[0016] Preferably, the base steel plate is composed of the following components in weight percentage: C 0.12% to 0.14%, Si 0.15% to 0.4%, Mn 1.3% to 1.4%, P ≤ 0.008%, S ≤ 0.0015%, Ni 0.5% to 0.6%, Mo 0.45% to 0.5%, Al 0.02% to 0.04%, Nb 0.015% to 0.02%, and the balance is Fe and unavoidable impurities.
[0017] Preferably, the base steel plate has a thickness of 55 to 60 mm and a width of 2000 to 3900 mm.
[0018] Preferably, the transverse impact energy value of the base steel plate at 1 / 2 of the thickness at 10°C is ≥100 J, the yield strength is ≥345 MPa, the tensile strength is 550-690 MPa, and the elongation after fracture A is ≥18.0%.
[0019] Beneficial effects of the present invention:
[0020] The invention provides a production method of SA-533 Gr.BCL.1 composite plates for nuclear power. The method comprises the following steps: a base steel plate is quenched and tempered, and then a 7mm-thick 304 stainless steel plate is laminated on the lower surface. The laminated surface is then welded with a 40mm-thick low-alloy Q355B steel plate. The steel plate is formed by welding and laminating three layers of steel plates. The specific thickness specification is 40mm (Q355B) + 7mm 304 / 58mm SA533GrBCL1, and the actual total thickness is about 107mm. The composite plates are produced by quenching and tempering, and the steel plates are normally loaded into a furnace for heating, quenching, and tempering. After heat treatment, the composite plates meet the technical requirements of WYJ219-2023, with a yield strength of 345MPA or greater, a tensile strength of 550-690MPA, an elongation of 18 or greater, and a longitudinal and transverse impact strength of 10°C of 100J or greater (single value 100J). The method also enables mass production of the steel.
[0021] The SA-533 Gr.BCL.1 composite steel plate produced by the steel plate production method of the present invention has good mechanical properties and the advantage of easy processing. It has successfully achieved mass production and has been applied in key parts of a certain nuclear power plant. The present invention effectively controls the risk of warping, avoids damage to equipment and affects production. DETAILED DESCRIPTION
[0022] The present invention will be further described in detail below with reference to specific embodiments.
[0023] Example 1
[0024] The composite plate of this embodiment is 112mm:45mm(Q355B)+7mm304 / 58mmSA533GrBCL1, furnace number 24100161, and is composed of the following components in weight percentage: C0.13%, Si0.28%, Mn1.3%, P0.008%, S0.0015%, Ni0.5%, Mo0.47%, Alt0.028%, Nb0.015%, CEV0.4721, and the balance is Fe and unavoidable impurities.
[0025] Contract requirements: Implementation of standard WYJ219-2023, head-to-tail sampling, tensile strength, impact strength, hardness, grain size, high-tension delivery, and die-weldability. Room-temperature tensile strength at half the plate thickness: Re ≥ 345 MPa, Rm 550-690 MPa, elongation ≥ 18, longitudinal and transverse impact strength at 10°C at half the plate thickness: ≥ 100 J (single value 100 J), high-temperature tensile strength: 150°C, hardness ≤ 250 HV. Die-weld process: 880°C, hold for 2.5 min / mm, water cooling after exiting the furnace; tempering: 670°C, hold for 4 min / mm, air cooling after exiting the furnace. Die-weld: 595°C-620°C, hold for 24 hours, temperature differential: ±10°C.
[0026] The steps of the steel plate production method are as follows:
[0027] (1) Smelting process: During the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. The argon blowing is kept good throughout the process. The refining white slag holding time is 36 minutes, the total LF refining time is 60 minutes, the vacuum degree is 30Pa, the vacuum holding time is 20 minutes, and the soft blowing is 10 minutes.
[0028] (2) Molding process: Select a 34.5-ton ingot (1020*2140*2600).
[0029] (3) Heating process: The obtained steel ingot was heated in a soaking furnace at a temperature of 1230℃~1280℃ for a total heating time of 1837min. After the ingot was cut into 400*2600*3750mm pieces, it was heated in a 3# continuous furnace for 493min with good heating quality.
[0030] (4) Rolling process: In the first stage, the starting rolling temperature is 1145℃, the final rolling temperature is 978℃, the longitudinal rolling reduction per pass is 20-35mm, and the widening reduction is 15-25mm; the steel thickness is 130mm; in the second stage, the starting rolling temperature is 870℃, the final rolling temperature is 850℃, and the II stage is rolled in 7 passes. After rolling, it enters ACC controlled cooling. The temperature before entering the water is about 840℃, and the red-return temperature is 640-650℃. When the surface temperature of the steel plate reaches about 200-350℃, it is promptly taken off the line for stacking. The total stacking time is about 52 hours.
[0031] (5) Composite plate: base steel plate SA-533 Gr.BCL.1 (58mm) + composite 7mm thick 304 stainless steel + welded 45mm thick low alloy Q355B steel plate. The steel plate is made of 3 layers of steel plates welded + composited, with a total thickness of about 112mm.
[0032] (6) Heat treatment process: LOF quenching furnace quenching: 900℃, PLC+20min maximum water V=2 swing 15min tempering: 680℃±10℃, 4.5min / mm.
[0033] The mechanical properties test results of the steel plate are shown in Table 1.
[0034] Example 2
[0035] The composite plate of this embodiment is 107mm:40mm(Q355B)+7mm304 / 58mmSA533GrBCL1, furnace number 24100214, and is composed of the following components in weight percentage: C0.12%, Si0.25%, Mn1.38%, P0.007%, S0.0011%, Ni0.54%, Mo0.472%, Alt0.025%, Nb0.017%, CEV0.4912, and the balance is Fe and unavoidable impurities.
[0036] Contract requirements: Implementation of standard WYJ219-2023, head-to-tail sampling, tensile strength, impact strength, hardness, grain size, high-tension delivery, and die-weldability. Room-temperature tensile strength at half the plate thickness: Re ≥ 345 MPa, Rm 550-690 MPa, elongation ≥ 18, longitudinal and transverse impact strength at 10°C at half the plate thickness: ≥ 100 J (single value 100 J), high-temperature tensile strength: 150°C, hardness ≤ 250 HV. Die-weld process: 880°C, hold for 2.5 min / mm, water cooling after exiting the furnace; tempering: 670°C, hold for 4 min / mm, air cooling after exiting the furnace. Die-weld: 595°C-620°C, hold for 24 hours, temperature differential: ±10°C.
[0037] The steps of the steel plate production method are as follows:
[0038] (1) Smelting process: During the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. The argon blowing is kept good throughout the process. The refining white slag holding time is 38 minutes, the total LF refining time is 62 minutes, the vacuum degree is 60Pa, the vacuum holding time is 16 minutes, and the soft blowing is 6 minutes.
[0039] (2) Molding process: Select a 23.5-ton ingot (771*1895*2380).
[0040] (3) Heating process: The obtained steel ingot was heated in a soaking furnace at a temperature of 1230℃~1280℃ for a total heating time of 1203min. After the ingot was cut into 300*2400*3460mm, it was heated in a 3# continuous furnace for 587min with good heating quality.
[0041] (4) Rolling process: In the first stage, the starting rolling temperature is 1055℃, the final rolling temperature is 910℃, the longitudinal rolling reduction per pass is 20-35mm, and the widening reduction is 15-25mm; the steel thickness is 130mm; in the second stage, the starting rolling temperature is 852℃, the final rolling temperature is 828℃, and the II stage is rolled in 7 passes. After rolling, it enters ACC controlled cooling. The temperature before entering the water is about 810℃, and the red-return temperature is 620-635℃. When the surface temperature of the steel plate is about 200-350℃, it is promptly taken off the line for stacking. The total stacking time is about 40 hours.
[0042] (5) Composite plate: base steel plate SA-533 Gr.BCL.1 (58mm) + composite 7mm thick 304 stainless steel + welded 40mm thick low alloy Q355B steel plate. The steel plate is made of three layers of steel plates welded and composited. The total thickness is about 107mm.
[0043] (6) Heat treatment process: LOF quenching furnace quenching: 890℃, PLC+20min maximum water V=2 swing 15min tempering: 680℃±10℃, 4.5min / mm.
[0044] The mechanical properties test results of the steel plate are shown in Table 1.
[0045] Example 3
[0046] The composite plate of this embodiment is 107mm:40mm(Q355B)+7mm304 / 58mmSA533GrBCL1, furnace number 24100221, and is composed of the following components in weight percentage: C0.13%, Si0.19%, Mn1.31%, P0.004%, S0.0009%, Ni0.55%, Mo0.469%, Alt0.03%, Nb0.017%, CEV0.4876, and the balance is Fe and unavoidable impurities.
[0047] Contract requirements: Implementation of standard WYJ219-2023, head-to-tail sampling, tensile strength, impact strength, hardness, grain size, high-tension delivery, and die-weldability. Room-temperature tensile strength at half the plate thickness: Re ≥ 345 MPa, Rm 550-690 MPa, elongation ≥ 18, longitudinal and transverse impact strength at 10°C at half the plate thickness: ≥ 100 J (single value 100 J), high-temperature tensile strength: 150°C, hardness ≤ 250 HV. Die-weld process: 880°C, hold for 2.5 min / mm, water cooling after exiting the furnace; tempering: 670°C, hold for 4 min / mm, air cooling after exiting the furnace. Die-weld: 595°C-620°C, hold for 24 hours, temperature differential: ±10°C.
[0048] The steps of the steel plate production method are as follows:
[0049] (1) Smelting process: During the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. The argon blowing is kept good throughout the process. The refining white slag holding time is 37 minutes, the total LF refining time is 60 minutes, the vacuum degree is 17Pa, the vacuum holding time is 17 minutes, and the soft blowing is 9 minutes.
[0050] (2) Molding process: Select a 37.5-ton ingot (800*2015*3030).
[0051] (3) Heating process: The obtained steel ingot was heated in a soaking furnace at a temperature of 1230℃~1280℃ for a total heating time of 1145min. After the ingot was opened into a 330*2500*3900mm billet, it was heated in a 3# continuous furnace for 555min with good heating quality.
[0052] (4) Rolling process: In the first stage, the starting rolling temperature is 1081℃, the final rolling temperature is 934℃, the longitudinal rolling reduction per pass is 20-35mm, and the widening reduction is 15-25mm; the steel thickness is 130mm; in the second stage, the starting rolling temperature is 860℃, the final rolling temperature is 836℃, and the II stage is rolled in 7 passes. After rolling, it enters ACC controlled cooling. The temperature before entering the water is about 831℃, and the red-return temperature is 620-650℃. When the surface temperature of the steel plate reaches about 200-350℃, it is promptly taken off the line for stacking. The total stacking time is 24 hours.
[0053] (5) Composite plate: base steel plate SA-533 Gr.BCL.1 (58mm) + composite 7mm thick 304 stainless steel + welded 40mm thick low alloy Q355B steel plate. The steel plate is made of three layers of steel plates welded and composited. The total thickness is about 107mm.
[0054] (6) Heat treatment process: LOF quenching furnace quenching: 900℃, PLC+20min maximum water V=2 swing 15min tempering: 680℃±10℃, 4.5min / mm.
[0055] The mechanical properties test results of the steel plate are shown in Table 1.
[0056] Example 4
[0057] The composite plate of this embodiment is 107mm:40mm(Q355B)+7mm304 / 58mmSA533GrBCL1, furnace number 24100220, and is composed of the following components in weight percentage: C0.14%, Si0.22%, Mn1.34%, P0.006%, S0.0009%, Ni0.53%, Mo0.47%, Alt0.031%, Nb0.017%, CEV0.492, and the balance is Fe and unavoidable impurities.
[0058] Contract requirements: Implementation of standard WYJ219-2023, head-to-tail sampling, tensile strength, impact strength, hardness, grain size, high-tension delivery, and die-weldability. Room-temperature tensile strength at half the plate thickness: Re ≥ 345 MPa, Rm 550-690 MPa, elongation ≥ 18, longitudinal and transverse impact strength at 10°C at half the plate thickness: ≥ 100 J (single value 100 J), high-temperature tensile strength: 150°C, hardness ≤ 250 HV. Die-weld process: 880°C, hold for 2.5 min / mm, water cooling after exiting the furnace; tempering: 670°C, hold for 4 min / mm, air cooling after exiting the furnace. Die-weld: 595°C-620°C, hold for 24 hours, temperature differential: ±10°C.
[0059] The steps of the steel plate production method are as follows:
[0060] (1) Smelting process: During the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. The argon blowing is kept good throughout the process. The refining white slag holding time is 38 minutes, the total LF refining time is 69 minutes, the vacuum degree is 30Pa, the vacuum holding time is 15 minutes, and the soft blowing is 8 minutes.
[0061] (2) Molding process: Select a 24.11 ton ingot (710*1895*2380).
[0062] (3) Heating process: The obtained steel ingot was heated in a soaking furnace at a temperature of 1230℃~1280℃ for a total heating time of 1285min. After the ingot was cut into 300*2400*3460mm, it was heated in the 3# continuous furnace for 549min, with good heating quality.
[0063] (4) Rolling process: In the first stage, the starting rolling temperature is 1100℃, the final rolling temperature is 935℃, the longitudinal rolling reduction per pass is 20-35mm, and the widening reduction is 15-25mm; the steel thickness is 130mm; in the second stage, the starting rolling temperature is 858℃, the final rolling temperature is 840℃, and the II stage is rolled in 7 passes. After rolling, it enters ACC controlled cooling. The temperature before entering the water is about 822℃, and the red-return temperature is 625-635℃. When the surface temperature of the steel plate is about 200-350℃, it is promptly taken off the line for stacking. The total stacking time is 32 hours.
[0064] (5) Composite plate: base steel plate SA-533 Gr.BCL.1 (58mm) + composite 7mm thick 304 stainless steel + welded 40mm thick low alloy Q355B steel plate. The steel plate is made of three layers of steel plates welded and composited. The total thickness is about 107mm.
[0065] (6) Heat treatment process: LOF quenching furnace quenching: 910℃, PLC+20min maximum water V=2 swing 15min tempering: 680℃±10℃, 4.5min / mm.
[0066] The mechanical properties test results of the steel plate are shown in Table 1.
[0067] Table 1
[0068]
[0069]
[0070] In summary, the above implementation examples illustrate that the present invention relates to a method for producing SA-533Gr.BCL.1 composite plates for nuclear power, the performance of which in the delivered and mold-welded states fully meets the requirements of standards and design specifications, the heat treatment process is smooth, the comprehensive mechanical properties are good, and mass production can be achieved.
[0071] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A method for producing SA-533 Gr.BCL.1 composite board for nuclear power, characterized in that: The following steps are involved: (1) Smelting process; (2) Die casting process; (3) Heating process; (4) Rolling process: ingot blank rolling, blank material rolling: first stage, starting rolling temperature is 1050-1150℃, final rolling temperature is 900-980℃, longitudinal rolling single pass reduction is 20-35mm, widening reduction is 15-25mm; air-drying steel thickness is 130mm; second stage, starting rolling temperature is 850-870℃, final rolling temperature is 820-850℃; (5) Composite plate: base steel plate + composite 304 stainless steel + welded steel plate, three-layer structure; (6) Heat treatment process.
2. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: (1) Smelting process: During the smelting process, the raw materials are initially refined in an electric furnace / converter, and then transferred to LF refining after the initial refining. The argon blowing is kept good throughout the process, the refining white slag holding time is greater than 30 minutes, the total LF refining time is greater than 55 minutes, S≤0.003%, vacuum degree 15~70Pa, vacuum holding time 15~20 minutes, and soft blowing for 6~10 minutes.
3. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: Step (2) Molding process: Select 23.5-37.5 ton ingot for smelting.
4. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: Step (3) Heating process: Before heating, the steel ingot is peeled and cleaned on both sides, and the obtained steel ingot is heated in a soaking furnace at a heating temperature of 1230°C~1280°C.
5. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: Step (4) rolling process: 7 passes of rolling in stage II, after rolling, enter ACC controlled cooling, the temperature before entering the water is 800-840℃, the red-return temperature is 620~650℃, and the steel plate is stacked in time when the surface temperature of the steel plate reaches 200~350℃, and the stacking time is ≥24 hours.
6. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: Step (5) Composite plate: After the base steel plate is quenched and tempered, the lower surface is composited with 304 stainless steel, and then a piece of Q355B steel plate is welded to the composite surface, and the composite plate is quenched and tempered again; The base steel plate is SA-533 Gr.BCL.1 base steel plate.
7. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 6, characterized in that: Step (6) heat treatment process: the base steel plate and the composite steel plate adopt a quenching + tempering heat treatment process; Quenching: 900℃±10℃, PLC+20min, through hardening; tempering: 680℃±10℃, 4.0-4.5min / mm; To ensure the heating effect, the burner integrity rate is above 95%, the quenching machine water temperature is ≤30℃, and the steel plate is heated evenly at the head and tail; the steel plates are tempered at a distance, and the steel loading interval is 30 minutes per piece.
8. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: The base steel plate is composed of the following components in weight percentage: C 0.12% to 0.14%, Si 0.15% to 0.4%, Mn 1.3% to 1.4%, P ≤ 0.008%, S ≤ 0.0015%, Ni 0.5% to 0.6%, Mo 0.45% to 0.5%, Al 0.02% to 0.04%, Nb 0.015% to 0.02%, and the balance is Fe and unavoidable impurities.
9. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: The base steel plate has a thickness of 55-60 mm and a width of 2000-3900 mm.
10. The method for producing SA-533 Gr.BCL.1 composite board for nuclear power according to claim 1, characterized in that: The base steel plate has a transverse impact energy value of 10°C at 1 / 2 of its thickness of ≥100J, a yield strength of ≥345Mpa, a tensile strength of 550-690Mpa, and an elongation after fracture A of ≥18.0%.