CN114293110B - Thick 800 MPa-grade hydroelectric steel and efficient low-cost production method thereof - Google Patents
Thick 800 MPa-grade hydroelectric steel and efficient low-cost production method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of hydroelectric steel production, in particular to a thick 800 MPa-grade hydroelectric steel and an efficient low-cost production method thereof. The method specifically comprises the following steps: 1) Heating the steel billet at 1200-1300 ℃, and descaling the steel billet after discharging; 2) The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling initial rolling temperature is 920-960 ℃; 3) Stacking and slowly cooling after rolling off the line, wherein the slow cooling temperature is not less than 350 ℃; 4) The quenching heating temperature is 895-905 ℃, the heating rate is 8.5-15 ℃/min, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 0.2-0.3 min/mm; 5) Quenching, wherein the advancing speed of the steel plate in the quenching machine is 2-4 m/min, and the steel plate swings 8-12 min in a low-pressure area; 6) The tempering heating temperature is 590-600 ℃, the heating rate is 3.5-5.5 ℃/min, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 1-2 min/mm. The yield strength, the tensile strength, the elongation after fracture and the average value of the impact power of the 800 MPa-grade thick hydroelectric steel plate are ensured to meet the relevant standards, the cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of hydroelectric steel production, in particular to a thick 800 MPa-grade hydroelectric steel and an efficient low-cost production method thereof.
Background
The hydroelectric steel plate is widely applied to national production and economic construction, and plays a positive role in promoting social development. Influenced by the specificity of the industry, the steel used in the core field of part of hydropower stations has the characteristics of thick specification and high strength. The 800 MPa-grade hydroelectric steel plate with the thickness of 40-65 mm has high performance requirement and complex production process, so that the steel plate has high production cost and low efficiency.
The production process of the hydroelectric steel plate with the thickness of 40-65 mm and the specification of 800MPa is optimized, the requirements of the steel plate industry development are met, and the method has important significance for reducing the enterprise cost and promoting the industry upgrading.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the thick 800 MPa-grade hydroelectric steel and the efficient low-cost production method thereof. The yield strength, the tensile strength, the elongation after fracture and the average value of the impact power of the hydropower steel plate with the thickness of 40-65 mm and the specification of 800MPa are ensured to meet the relevant standards, the enterprise cost is reduced, and the enterprise production efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the thick 800MPa grade hydroelectric steel has a thickness of 40-65 mm and consists of the following chemical elements in percentage by weight:
c: 0.07-0.09%, si 0.02-0.1%, mn:1.2% -1.3%, ni: 0.7-0.8%, cr:0.44% -0.54%, mo:0.35% -0.45%, V:0.03% -0.05%, cu: 0.22-0.28%, B:0.0007% -0.0013%, ti: 0.005-0.15%, P is less than or equal to 0.01%, S is less than or equal to 0.005%, als:0.035% -0.055%, ceq:0.47% -0.52%, pcm is less than or equal to 0.25%; wherein Ceq = C + Mn/6+ Si/24+ Ni/40+ Cr/5+ Mo/4+ V/14, pcm = C + Si/30+ (Mn + Cu + Cr)/20 + Ni/60+ Mo/15+ V/10+5B, and the balance is iron and unavoidable impurities.
A method for efficiently producing 800 MPa-grade thick hydroelectric steel with low cost comprises the following process flows: converter smelting-LF-RH-continuous casting-slow cooling-slab heating-rolling-stacking slow cooling-heat treatment, which specifically comprises the following steps:
1) Smelting by adopting a converter, stopping slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm;
2) Adding auxiliary materials into LF for slagging, adjusting the temperature and components of molten steel, and blowing argon for more than or equal to 5min; the final temperature is more than or equal to 1600 ℃, caO/Al in slag 2 O 3 The mass percentage is controlled to be 2-3;
3) RH degassing treatment is carried out to reduce the gas content of the molten steel, the RH vacuum net circulation time is more than or equal to 10min, and the end point H content is less than or equal to 2.0ppm;
4) Controlling the target superheat degree of the tundish at not more than 30 ℃;
5) The continuous casting billets are subjected to slow cooling stacking after being discharged, and the stacking time is not less than 48h;
6) Heating the steel billet at 1200-1300 ℃, and descaling the steel billet after discharging;
7) The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling initial rolling temperature is 920-960 ℃;
8) Stacking and slowly cooling after rolling off the line, wherein the slow cooling temperature is not less than 350 ℃;
9) The quenching heating temperature is 895-905 ℃, the heating rate is 8.5-15 ℃/min, and the thicker the steel plate is, the slower the heating rate is. The net heat preservation time is 0.2-0.3 min/mm;
10 Quenching, wherein the advancing speed of the steel plate in the quenching machine is 2-4 m/min, and the steel plate swings for 8-12 min in a low-pressure area;
11 The tempering heating temperature is 590-600 ℃, the heating rate is 3.5-5.5 ℃/min, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 1-2 min/mm.
The slow cooling time in the step 8) is not less than 16h;
the flow rate and the number of opening groups of each quenching nozzle in the step 10) are as follows:
slit type nozzle upper setThe flow rate of the pipe is more than 760m 3/ h, the flow rate of the lower collecting pipe of the slit nozzle is more than 988m 3 The number of the slit type nozzle groups is 1 to 2;
the flow rate of the upper collecting pipe of the inclined array circular hole nozzle is more than 190m 3 Flow rate of lower collecting pipe of inclined array circular hole nozzle is more than 247m 3 The number of the inclined array circular hole nozzle groups is 4-6;
the flow of the upper collecting pipe of the multi-angle cambered surface jet flow array nozzle is more than 220m 3 Flow rate of lower collecting pipe of multi-angle cambered surface jet flow array nozzle is larger than 297m 3 And h, the number of the multi-angle cambered jet array nozzle groups is 1-20.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention cancels Nb element, and reduces partial alloy cost while ensuring strength and toughness.
(2) The invention refines the quenching process parameters and has stronger guiding significance for the production of other medium plate plants.
(3) Compared with other inventions, the quenching temperature used by the invention is reduced, and the coal gas cost is reduced.
(4) Compared with other inventions, the tempering temperature used by the invention is reduced, and the coal gas cost is reduced.
(5) The thick 800MPa grade hydroelectric steel has the maximum thickness of 65mm, the yield strength of 760-800 MPa, the tensile strength of 800-820 MPa, the elongation after fracture of 18-25 percent and the average impact energy of 180-210J, and meets the requirements of relevant protocol standards.
Detailed Description
The invention discloses a thick 800 MPa-grade hydroelectric steel and a high-efficiency and low-cost production method thereof. Those skilled in the art can modify the process parameters appropriately in view of the disclosure herein. It is specifically noted that all such substitutions and modifications will be apparent to those skilled in the art and are intended to be included herein. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The 800 MPa-grade hydroelectric steel with the thickness of 40-65 mm comprises the following chemical elements in percentage by weight:
c: 0.07-0.09%, si 0.02-0.1%, mn:1.2% -1.3%, ni: 0.7-0.8%, cr:0.44% -0.54%, mo: 0.35-0.45%, V: 0.03-0.05%, cu: 0.22-0.28%, B:0.0007% -0.0013%, ti: 0.005-0.15%, P is less than or equal to 0.01%, S is less than or equal to 0.005%, als:0.035% -0.055%, ceq:0.47 to 0.52 percent, pcm is less than or equal to 0.25 percent; wherein Ceq = C + Mn/6+ Si/24+ Ni/40+ Cr/5+ Mo/4+ V/14, pcm = C + Si/30+ (Mn + Cu + Cr)/20 + Ni/60+ Mo/15+ V/10+5B, and the balance is iron and unavoidable impurities.
A method for efficiently producing 800 MPa-grade thick hydroelectric steel with low cost comprises the following process flows: the method comprises the following steps of molten iron pretreatment, converter smelting, LF-RH, continuous casting, slow cooling, slab cleaning, slab heating, descaling, rolling, straightening, stacking and slow cooling, flaw detection, heat treatment, cutting rule, inspection and warehouse collection, and specifically comprises the following steps:
1. smelting in a converter, stopping slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm.
2. LF is added with auxiliary materials for slagging, the temperature and the components of the molten steel are adjusted, and the net argon blowing time is more than or equal to 5min; the final temperature is more than or equal to 1600 ℃, caO/Al in the slag 2 O 3 The mass percentage is controlled to be 2 to 3;
3. RH degassing treatment reduces the gas content of molten steel. The RH vacuum circulation time is more than or equal to 10min.
4. The target superheat degree of the tundish is controlled at the temperature of not more than 30 ℃.
5. And (5) performing slow cooling stacking on the lower line of the continuous casting billet, wherein the stacking time is not less than 48h.
6. Heating the steel billet according to a heating schedule of 1200-1300 ℃, and descaling the steel billet by using a descaling box after the steel billet is discharged from the furnace.
7. The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling initial rolling temperature is 920-960 ℃.
8. And after rolling is finished, stacking and slow cooling are carried out, the slow cooling temperature is not less than 350 ℃, and the slow cooling time is not less than 16h.
9. Heating at 895-905 ℃ during quenching, wherein the heating rate is 8.5-15 ℃/min, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 0.2-0.3 min/mm;
10. quenching, wherein the advancing speed of the steel plate in the quenching machine is 3m/min, the steel plate swings for 10min in a low-pressure area, and the flow rate and the opening group number of each nozzle execute the following table:
TABLE 1 flow rate and number of open groups per nozzle
11. And heating at 590-600 ℃ during tempering, wherein the heating rate is 3.5-5.5 ℃/min, and the thicker the steel plate is, the slower the heating rate is. The net heat preservation time is 1-2 min/mm.
Example 1:
an 800MPa grade Q690E steel plate is 48mm in thickness and comprises the following chemical elements in percentage by weight:
C:0.08％、Si:0.06％、Mn:1.3％、Ni:0.74％、Cr:0.46％、Mo:0.36％、V:0.04％、Cu:0.24％、B:0.0012％、Ti:0.011％、P:0.01％、S:0.002％、Als:0.047％。
the production method comprises the following steps:
1. smelting in a converter, stopping slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm.
2. And (3) adding auxiliary materials into the LF for slagging, adjusting the temperature and the components of the molten steel, and blowing argon for more than or equal to 5min.
3. RH degassing treatment reduces the gas content of molten steel. The RH vacuum circulation time is more than or equal to 10min.
4. The target superheat degree of the tundish is controlled according to the temperature not higher than 30 ℃.
5. And (5) performing slow cooling stacking on the continuous casting blank, wherein the stacking time is not less than 48h.
6. Heating the steel billet according to a heating schedule of 1200-1300 ℃, and descaling the steel billet by using a descaling box after the steel billet is discharged from the furnace.
7. The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling start temperature is 920-960 ℃.
8. And after rolling is finished, stacking and slow cooling are carried out, the slow cooling temperature is not less than 350 ℃, and the slow cooling time is not less than 16h.
9. During quenching, the heating temperature is 895-905 ℃ and the heating rate is 13.9 ℃/min and the net heat preservation time is 0.22min/mm.
10. The steel plate advances at a speed of 3m/min in the quenching machine, swings for 10min in a low-pressure zone, and the flow rate of each nozzle and the number of open groups are shown in Table 1.
11. And during tempering, the heating temperature is 590-600 ℃, the heating rate is 5.2 ℃/min, and the net heat preservation time is 1.72min/mm.
The mechanical properties are as follows: the yield strength is 780Mpa, the tensile strength is 819Mpa, the elongation after fracture is 18.5 percent, and the average value of the impact energy is 180J, and the requirements of relevant protocol standards are met.
Example 2:
an 800MPa grade Q690E steel plate, which is 52mm thick and comprises the following chemical elements in percentage by weight:
C:0.08％、Si:0.06％、Mn:1.3％、Ni:0.74％、Cr:0.46％、Mo:0.36％、V:0.04％、Cu:0.24％、B:0.0012％、Ti:0.011％、P:0.01％、S:0.002％、Als:0.047％。
the production method comprises the following steps:
1. smelting in a converter, stopping slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm.
2. And (4) adding auxiliary materials into the LF for slagging, adjusting the temperature and the components of the molten steel, and blowing argon for more than or equal to 5min.
3. RH degassing treatment reduces the gas content of molten steel. The RH vacuum circulation time is more than or equal to 10min.
4. The target superheat degree of the tundish is controlled according to the temperature not higher than 30 ℃.
5. And (5) performing slow cooling stacking on the lower line of the continuous casting billet, wherein the stacking time is not less than 48h.
6. The billet heating system is according to the range of 1200-1300 ℃, and the billet is taken out of the furnace and descaled by using a descaling box.
7. The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling start temperature is 920-960 ℃.
8. And after rolling is finished, stacking and slow cooling are carried out, the slow cooling temperature is not less than 350 ℃, and the slow cooling time is not less than 16h.
9. During quenching, the heating temperature is 895-905 ℃ and the heating rate is 13.4 ℃/min, and the net heat preservation time is 0.21min/mm.
10. The steel plate advances at a speed of 3m/min in the quenching machine, swings for 10min in a low pressure area, and the flow rate of each nozzle and the number of open groups are shown in table 1.
11. During tempering, the heating temperature is 590-600 ℃, the heating rate is 4.7 ℃/min, and the net heat preservation time is 1.66min/mm. .
The mechanical properties are as follows: the yield strength is 771Mpa, the tensile strength is 818Mpa, the elongation after fracture is 22 percent, and the average value of impact energy is 209J, which meets the standard requirements of related protocols.
Example 3:
an 800MPa grade Q690E steel plate is 62mm in thickness and comprises the following chemical elements in percentage by weight:
C:0.08％、Si:0.06％、Mn:1.3％、Ni:0.74％、Cr:0.46％、Mo:0.36％、V:0.04％、Cu:0.24％、B:0.0012％、Ti:0.011％、P:0.01％、S:0.002％、Als:0.047％。
the production method comprises the following steps:
1. smelting in a converter, stopping slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm.
2. And (3) adding auxiliary materials into the LF for slagging, adjusting the temperature and the components of the molten steel, and blowing argon for more than or equal to 5min.
3. RH degassing treatment reduces the gas content of molten steel. The RH vacuum circulation time is more than or equal to 10min.
4. The target superheat degree of the tundish is controlled at the temperature of not more than 30 ℃.
5. And (5) performing slow cooling stacking on the lower line of the continuous casting billet, wherein the stacking time is not less than 48h.
6. The billet heating system is according to the range of 1200-1300 ℃, and the billet is taken out of the furnace and descaled by using a descaling box.
7. The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate billet is not less than twice of that of the finished product, and the finish rolling start temperature is 920-960 ℃.
8. And after rolling is finished, stacking and slow cooling are carried out, the slow cooling temperature is not less than 350 ℃, and the slow cooling time is not less than 16h.
9. During quenching, the heating temperature is 895-905 ℃ and the heating rate is 9 ℃/min, and the net heat preservation time is 0.28min/mm.
10. The steel plate advances at a speed =2.4m/min in the quenching machine, the steel plate swings for 10min in a low-pressure area, and the flow rate and the number of open groups of each nozzle are shown in table 1.
11. And during tempering, the heating temperature is 590-600 ℃, the heating rate is 3.8 ℃/min, and the net heat preservation time is 1.58min/mm. .
The mechanical properties are as follows: the yield strength is 762Mpa, the tensile strength is 806Mpa, the elongation after fracture is 21 percent, and the impact energy mean value is 197J, which meets the standard requirements of related protocols.
The invention realizes the reduction of enterprise cost and the improvement of enterprise production efficiency while ensuring that the yield strength, the tensile strength, the elongation after fracture and the average value of the impact power of the 800 MPa-grade hydroelectric steel plate with the thickness of 40-65 mm meet the relevant standards.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The method for efficiently producing the 800 MPa-grade hydroelectric steel with the thickness specification at low cost is characterized in that the thickness of the 800 MPa-grade hydroelectric steel with the thickness specification is 40-65mm, the yield strength is 760-800Mpa, the tensile strength is 800-820 Mpa, the elongation after fracture is 18-25%, and the average impact power is 180-210J, and the method comprises the following chemical elements in percentage by weight:
c:0.07% -0.09%, si 0.02% -0.1%, mn:1.2% -1.3%, ni: 0.7-0.8%, cr:0.44% -0.54%, mo:0.35% -0.45%, V:0.03% -0.05%, cu: 0.22-0.28%, B:0.0007% -0.0013%, ti: 0.005-0.15%, P is less than or equal to 0.01%, S is less than or equal to 0.005%, als:0.035% -0.055%, ceq: 0.47-0.52%, pcm is less than or equal to 0.25%; wherein Ceq = C + Mn/6+ Si/24+ Ni/40+ Cr/5+ Mo/4+ V/14, pcm = C + Si/30+ (Mn + Cu + Cr)/20 + Ni/60+ Mo/15+ V/10+5B, and the balance is iron and unavoidable impurities;
the process flow is as follows: converter smelting-LF-RH-continuous casting-slow cooling-slab heating-rolling-stacking slow cooling-heat treatment, which specifically comprises the following steps:
1) Smelting by adopting a converter, blocking slag and tapping, wherein the thickness of molten steel slag is less than or equal to 100mm;
2) LF is added with auxiliary materials for slagging, the temperature and the components of the molten steel are adjusted, and the net argon blowing time is more than or equal to 5min; the final temperature is more than or equal to 1600 ℃, caO/Al in slag 2 O 3 Controlling the mass ratio to be 2 to 3;
3) The gas content of the molten steel is reduced by RH degassing treatment, the RH vacuum net circulation time is more than or equal to 10min, and the end point H content is less than or equal to 2.0ppm; 4) Controlling the target superheat degree of the tundish at not more than 30 ℃;
5) Performing slow cooling stacking on the continuous casting blank, wherein the stacking time is not less than 48h;
6) Heating the steel billet at 1200-1300 ℃, and descaling the steel billet after the steel billet is taken out of the furnace;
7) The rough rolling temperature is more than or equal to 1100 ℃, the thickness of the intermediate blank is not less than twice of that of the finished product, and the finish rolling start rolling temperature is 920 to 960 ℃;
8) Stacking and slowly cooling after rolling off the line, wherein the slow cooling temperature is not less than 350 ℃;
9) The quenching heating temperature is 895 to 905 ℃, the heating rate is 8.5 to 15 ℃/min, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 0.2 to 0.3min/mm;
10 Quenching, wherein the advancing speed of the steel plate in a quenching machine is 2 to 4m/min, and the steel plate swings for 8 to 12min in a low-pressure area;
the flow rate and the number of the opening groups of each quenching nozzle are as follows:
the flow rate of the upper collecting pipe of the slit nozzle is more than 760m 3/ h, the flow rate of the lower collecting pipe of the slit nozzle is more than 988m 3 The number of the slit nozzle groups is 1 to 2;
the flow rate of the upper collecting pipe of the inclined array circular hole nozzle is more than 190m 3 Flow rate of lower header pipe of inclined array circular hole nozzle is greater than 247m 3 The number of groups of the inclined array circular hole nozzles is 4 to 6;
the flow of the upper collecting pipe of the multi-angle cambered surface jet flow array nozzle is more than 220m 3 Multi-angle cambered surface jet arrayFlow rate of lower header of column nozzle is greater than 297m 3 The number of groups of the multi-angle cambered jet array nozzles is 1 to 20;
11 590 ℃ of tempering heating temperature, 3.5 to 5.5 ℃/min of heating rate, the thicker the steel plate is, the slower the heating rate is, and the net heat preservation time is 1 to 2min/mm.
2. The method for efficiently producing the 800MPa grade hydroelectric steel with low cost according to claim 1, which is characterized by further comprising the following steps: the slow cooling time in the step 8) is not less than 16h.
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