CN113512677A - Production method of steel for super-thick bridge structure - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 238000007670 refining Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 6
- 238000005204 segregation Methods 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
A production method of steel for an ultra-thick bridge structure comprises the following process routes of molten iron pretreatment → converter → refining → continuous casting → heating → rolling → cooling → tempering, and is characterized in that: the steel comprises the following chemical components, by weight, 0.05-0.07% of C, 0.15-0.30% of Si, 1.50-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.045% of Alt, 0.030-0.040% of Nb, 0.012-0.020% of Ti, 0.16-0.20% of Cr, less than or equal to 0.20% of Pcm, and the balance of Fe and inevitable impurities. The method overcomes the difficulty that the compression ratio of the extra-thick plate rolled by the continuous casting billet is not enough, solves the problems of permeation of rolling force along the thickness direction and insufficient core deformation in the thick plate rolling process, can produce the steel with the thickness of 80-120 mm and the strength of 430MPa for the bridge structure only by adopting the continuous casting billet and TMCP + T processes, and has short production period and low production cost.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of steel for an extra-thick bridge structure.
Background
The construction of highway bridges, railway bridges, cross-sea tunnels and cross-sea bridges has increasingly greater demand for high-performance steel for bridge structures. The steel for bridges in the future is developing towards high steel grade, extra-thick plate, high strength and toughness, low yield ratio, excellent fracture toughness and the like. Due to the fact that bridge projects with large span, complex structures and large flow are successively constructed, the steel for the bridge structures with the common wall thickness cannot meet the requirements of bridge construction development, and becomes a bottleneck restricting the technical development of bridges.
Chinese patent CN111118401A discloses a high-performance large-thickness easy-to-weld bridge structure and manufacture thereof, the invention adopts a 320-plus-450 mm thick section continuous casting billet, the heating time of the casting billet in a furnace is up to 480min, coal gas is wasted, and the productivity is restricted; meanwhile, the invention also adds precious alloy Mo, which can improve the strength and hardenability of the material, but increases the alloy cost invisibly.
Chinese patent CN108411188A discloses 'a thick steel plate with high straight crack arrest and fatigue strength and a preparation method thereof', wherein alloy elements Cu =0.30% -0.35%, Cr =0.27% -0.31%, Ni =0.40% -0.50%, and more precious alloy is added, although the hardenability of the steel is improved, the toughness of the material is improved, but the manufacturing cost is greatly increased.
Chinese patent CN105695869A discloses a hot rolled steel plate for a bridge with the yield strength of 450MPa and a manufacturing method thereof, which can not get rid of the limitation of a compression ratio, is only suitable for the production of steel plates for a thin bridge structure and can not meet the production of super-thick steel plates.
In summary, the existing steel plate for the super-thick bridge has many defects: (1) more precious alloy is added, and the manufacturing cost is high; (2) the large-size casting blank is adopted, the in-furnace time is prolonged, the yield is limited, and the production efficiency is low; (3) the bridge structure steel with the thickness larger than 80mm is produced by adopting a continuous casting billet larger than 320mm, and the super-thick bridge structure steel with the specification has low product performance stability and the like; (4) at present, most steel mills adopt normalizing or quenching and tempering treatment on thick (more than 80 mm) bridge steel, and the process has long process flow.
Disclosure of Invention
The invention aims to provide a production method of steel for an extra-thick bridge structure, which aims to solve the technical problem of production in the process of the steel for the extra-thick bridge structure. The steel plate for the bridge structure with the wall thickness of 80-120 mm is manufactured by adopting a continuous casting blank with the thickness of 300mm, the yield strength of the steel plate is more than or equal to 430MPa, the yield ratio is less than or equal to 0.82, the impact toughness at minus 40 ℃ is more than or equal to 200J, particularly, the thickness stretching is more than 45%, the steel plate has good lamellar tearing resistance, the production period of the steel plate is short, and the manufacturing cost is low.
The technical scheme of the invention is as follows:
a production method of steel for an ultra-thick bridge structure comprises the process route of molten iron pretreatment → converter → refining → continuous casting → heating → rolling → cooling → tempering. The steel comprises the following chemical components, by weight, 0.05-0.07% of C, 0.15-0.30% of Si, 1.50-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.045% of Alt, 0.030-0.040% of Nb, 0.012-0.020% of Ti, 0.16-0.20% of Cr, less than or equal to 0.20% of Pcm, and the balance of Fe and inevitable impurities; the key process steps are as follows:
(1) steel making and continuous casting: controlling production according to clean steel, wherein the superheat degree is 6-15 ℃, the electromagnetic stirring current is 240-280A, the frequency is 5-6.5 HZ, the dynamic soft reduction is 5-6 mm, the section of a blank is 300 x 2270mm, and the central segregation C class is less than or equal to 0.5;
(2) heating: directly conveying the hot casting blank to a heating furnace through a conveying roller way, wherein the feeding temperature is 400-650 ℃, the hearth temperature is 1100-1240 ℃, and the total time in the furnace is 220-260 min;
(3) rough rolling: setting the intermediate billet to be 140-150 mm, setting the initial rolling temperature to be 1120-1160 ℃, setting the final rolling temperature to be more than or equal to 980 ℃, and setting the pass to be 5-9;
(4) finish rolling: the initial rolling temperature is 840-860 ℃, the final rolling temperature is 770-800 ℃, and 7-9 passes are performed;
(5) and (3) cooling: rapidly cooling the rolled steel plate by using Mulpic, wherein the water pressure of a high-pressure section is 4-5 bar, and the water quantity is 160-180 m3The speed of the roller is 0.25-0.35 m/s; the steel plate is cooled to room temperature in a swinging mode in a low-pressure section, the water pressure is 0.8-1.2 bar, and the water quantity is 480-530 m3The speed of the roller is 0.45-0.5 m/s; the initial cooling temperature is 760-800 ℃, the cooling rate is 5-12 ℃, and the re-reddening temperature is 380-430 ℃;
(6) tempering: tempering temperature is 400 +/-10 ℃, heat preservation time is 1.8 multiplied by wall thickness min, and air cooling is carried out to normal temperature after tempering.
Compared with the prior art, the invention has the following advantages: the method overcomes the difficulty that the compression ratio of the extra-thick plate rolled by the continuous casting billet is not enough, solves the problems of permeation of rolling force along the thickness direction and insufficient core deformation in the thick plate rolling process, can produce the steel with the thickness of 80-120 mm and the strength of 430MPa for the bridge structure only by adopting the continuous casting billet and TMCP + T processes, and has short production period and low production cost.
Drawings
FIG. 1 is a photograph of a metallographic structure of a steel plate.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1: a method for producing a steel plate for 80mm bridge structure.
The steel comprises the following chemical components in percentage by weight: c =0.06%, Si =0.20%, Mn =1.54%, P =0.012%, S =0.004%, Alt =0.035%, Nb =0.036%, Ti =0.016%, Cr =0.17%, Pcm =0.17%, with the balance being Fe and unavoidable impurities; the key process steps are as follows:
(1) steel making and continuous casting: according to the production control of clean steel, the superheat degree is 10 ℃, the electromagnetic stirring current is 254A, the frequency is 5.8HZ, the dynamic soft reduction is 5.4mm, the section of a blank is 300 multiplied by 2270mm, and the center segregation C class is 0.5.
(2) Heating: directly conveying the hot casting blank to a heating furnace through a conveying roller way, wherein the feeding temperature is as follows: 580 ℃, hearth temperature: 1120-1220 ℃, total time in the furnace: 248 min.
(3) Rough rolling: the intermediate billet is set to be 142mm, the initial rolling temperature is 1150 ℃, the final rolling temperature is 986 ℃, and 7 passes are carried out.
(4) Finish rolling: the initial rolling temperature is 855 ℃, the final rolling temperature is 788 ℃, and 9 passes are performed.
(5) And (3) cooling: after rolling, the steel is rapidly cooled by Mulpic, the water pressure of a high-pressure section is 4.6bar, and the water quantity is 172m3Min, the roller speed is 0.26 m/s; the steel plate is cooled to room temperature in a low-pressure section in a swinging way, the water pressure is 0.9bar, and the water quantity is 522m3Min, the roller speed is 0.46 m/s; the initial cooling temperature is 770-790 ℃, the cooling rate is 8 ℃/s, and the temperature of red return is 390-420 ℃.
(6) Tempering: tempering temperature 406 ℃, and holding time: 144min, tempering and then air cooling to normal temperature.
Example 2: a method for producing a steel plate for a 100mm bridge structure.
The steel comprises the following chemical components in percentage by weight: c =0.06%, Si =0.26%, Mn =1.56%, P =0.008%, S =0.002%, Alt =0.032%, Nb =0.034%, Ti =0.015%, Cr =0.19%, Pcm =0.18%, and the balance being Fe and unavoidable impurities; the key process steps are as follows:
(1) steel making and continuous casting: according to the production control of clean steel, the superheat degree is 8 ℃, the electromagnetic stirring current is 252A, the frequency is 6.1HZ, the dynamic soft reduction is 5.8mm, the section of a blank is 300 multiplied by 2270mm, and the center segregation C class is 0.5;
(2) heating: directly conveying the hot casting blank to a heating furnace through a conveying roller way, wherein the feeding temperature is as follows: 510 ℃, furnace temperature: 1140-1220 ℃, total time in the furnace: 245 min;
(3) rough rolling: setting the intermediate billet to 145mm, the initial rolling temperature to 1145 ℃, the final rolling temperature to 985 ℃ and 7 passes;
(4) finish rolling: the initial rolling temperature is 852 ℃, the final rolling temperature is 770-790 ℃, and 9 passes are carried out;
(5) and (3) cooling: after rolling, the steel is rapidly cooled by Mulpic, the water pressure of a high-pressure section is 4.8bar, and the water quantity is 173m3Min, the roller speed is 0.26 m/s; the steel plate is cooled to room temperature in a low-pressure section in a swinging way, the water pressure is 1.1bar, and the water quantity is 515m3Min, the roller speed is 0.48 m/s; the initial cooling temperature is 760-780 ℃, the cooling rate is 7 ℃, and the re-reddening temperature is 380-410 ℃;
(6) tempering: tempering temperature 408 ℃, and holding time: and (4) tempering for 180min, and then air-cooling to normal temperature.
TABLE 1 test results of the properties of the steels
Claims (1)
1. A production method of steel for an ultra-thick bridge structure comprises the following process routes of molten iron pretreatment → converter → refining → continuous casting → heating → rolling → cooling → tempering, and is characterized in that: the steel comprises the following chemical components, by weight, 0.05-0.07% of C, 0.15-0.30% of Si, 1.50-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.045% of Alt, 0.030-0.040% of Nb, 0.012-0.020% of Ti, 0.16-0.20% of Cr, less than or equal to 0.20% of Pcm, and the balance of Fe and inevitable impurities; the key process steps are as follows:
(1) steel making and continuous casting: controlling production according to clean steel, wherein the superheat degree is 6-15 ℃, the electromagnetic stirring current is 240-280A, the frequency is 5-6.5 HZ, the dynamic soft reduction is 5-6 mm, the section of a blank is 300 x 2270mm, and the central segregation C class is less than or equal to 0.5;
(2) heating: directly conveying the hot casting blank to a heating furnace through a conveying roller way, wherein the feeding temperature is 400-650 ℃, the hearth temperature is 1100-1240 ℃, and the total time in the furnace is 220-260 min;
(3) rough rolling: setting the intermediate billet to be 140-150 mm, setting the initial rolling temperature to be 1120-1160 ℃, setting the final rolling temperature to be more than or equal to 980 ℃, and setting the pass to be 5-9;
(4) finish rolling: the initial rolling temperature is 840-860 ℃, the final rolling temperature is 770-800 ℃, and 7-9 passes are performed;
(5) and (3) cooling: rapidly cooling the rolled steel plate by using Mulpic, wherein the water pressure of a high-pressure section is 4-5 bar, and the water quantity is 160-180 m3The speed of the roller is 0.25-0.35 m/s; the steel plate is cooled to room temperature in a swinging mode in a low-pressure section, the water pressure is 0.8-1.2 bar, and the water quantity is 480-530 m3The speed of the roller is 0.45-0.5 m/s; the initial cooling temperature is 760-800 ℃, the cooling rate is 5-12 ℃, and the re-reddening temperature is 380-430 ℃;
(6) tempering: tempering temperature is 400 +/-10 ℃, heat preservation time is 1.8 multiplied by wall thickness min, and air cooling is carried out to normal temperature after tempering.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114892090A (en) * | 2022-05-25 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of Q550-grade high-corrosion-resistance high-strength offshore structure steel |
| CN115807192A (en) * | 2022-12-12 | 2023-03-17 | 湖南华菱湘潭钢铁有限公司 | Low-carbon 420 MPa-level TMCP structural steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540850A (en) * | 2013-10-23 | 2014-01-29 | 武汉钢铁(集团)公司 | Super-thick steel with yield strength >= 550MPa for engineering machinery as well as production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540850A (en) * | 2013-10-23 | 2014-01-29 | 武汉钢铁(集团)公司 | Super-thick steel with yield strength >= 550MPa for engineering machinery as well as production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892090A (en) * | 2022-05-25 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of Q550-grade high-corrosion-resistance high-strength offshore structure steel |
| CN115807192A (en) * | 2022-12-12 | 2023-03-17 | 湖南华菱湘潭钢铁有限公司 | Low-carbon 420 MPa-level TMCP structural steel and production method thereof |
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Application publication date: 20211019 |