CN112725691B - Low-alloy high-strength steel Q420C steel plate and production method thereof - Google Patents
Low-alloy high-strength steel Q420C steel plate and production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- 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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- 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
- C21D8/0226—Hot rolling
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a low-alloy high-strength steel Q420C steel plate, which comprises the following chemical components in percentage by mass: 0.16-0.20 percent of C, 0.15-0.30 percent of Si, 0.70-0.90 percent of Mn, 0.020 percent of P, 0.012 percent of S, 0.055-0.065 percent of Ti, 0.010-0.03 percent of Als, and the balance of Fe and residual elements; the invention also discloses a production method for reducing the cost of the low-alloy high-strength steel Q420C steel plate, the production method of the low-alloy high-strength steel Q420C steel plate adopts a low Mn-high Ti microalloy component system through reasonable component design, does not reduce the toughness on the premise of ensuring the strength, obtains an ideal F + P structure by adopting clean molten steel, optimized temperature-controlled rolling and ACC controlled cooling processes, has uniform and fine crystal grains, can meet the requirements of GB/T1591 and 2018 on mechanical properties, has lower production cost than other steel enterprises capable of producing Q420C, and has stronger competitive advantages.
Description
Technical Field
The invention belongs to the technical field of low-alloy high-strength steel production, and particularly relates to a low-alloy high-strength steel Q420C steel plate and a production method for reducing the production cost of the low-alloy high-strength steel Q420C steel plate.
Background
The low-alloy high-strength steel plate Q420C is widely applied to the fields of engineering machinery, manufacturing of factory building structural members and the like. The national standard requires that the impact energy of the steel plate is more than 34J at 0 ℃, and the steel plate has higher strength and better toughness. The normal-temperature and low-temperature tissues of the Q420C steel plate are generally ferrite plus pearlite, and a certain amount of microalloy such as Nb, V, Ti and the like is added on the basis of C-Mn components to ensure the matching of obdurability; or the ferrite grains are fully refined by the larger cooling speed and the lower final cooling temperature of the rolled steel plate to improve the strength and the toughness of the steel plate; or the mechanical property of the steel plate is improved through heat treatment, and the toughness and the plasticity are improved.
The prior art discloses a low-alloy high-strength Q420C medium steel plate and a production method thereof, wherein the application date of national patent number CN104018063A is 2014.09.03, and the prior art discloses that the Q420C steel plate with the thickness of less than 40mm is produced; the steel plate comprises the following chemical components in percentage by mass (unit, wt%): 0.16-1.08 percent of C, 0.35-0.45 percent of Si, 1.45-1.55 percent of Mn, 0.020 percent of P, 0.015 percent of S, 0.015-0.03 percent of Als, and the balance of Fe and residual elements; the production method comprises the following steps: the method comprises the steps of magnesium-based desulfurization of molten iron, converter smelting, LF furnace refining, RH furnace treatment, electromagnetic stirring and soft reduction in continuous casting, heating of casting blank, rolling and controlled cooling. In the component design of the steel plate in the prior art, the alloy cost is increased by adopting high manganese content Mn of 1.45-1.55%, and the process production cost is increased by adopting LF refining and RH refining double refining and adopting electromagnetic stirring in the continuous casting process. The invention provides a production method for reducing the production cost of a low-alloy high-strength steel Q420C steel plate.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-alloy high-strength steel Q420C steel plate and a production method for reducing the production cost of the low-alloy high-strength steel Q420C steel plate.
The invention is realized in such a way that the low-alloy high-strength steel Q420C steel plate comprises the following chemical components in percentage by mass: 0.16-0.20 percent of C, 0.15-0.30 percent of Si, 0.70-0.90 percent of Mn, 0.020 percent of P, 0.012 percent of S, 0.055-0.065 percent of Ti, 0.010-0.03 percent of Als, and the balance of Fe and residual elements;
the invention also provides a production method based on reduction of the production cost of the low-alloy high-strength steel Q420C steel plate, which sequentially comprises the steps of converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, rough rolling, finish rolling, laminar cooling, hot straightening, cooling by a cooling bed, shearing, sampling, inspecting and warehousing; the method is characterized in that:
the converter smelting process adopts a bottom blowing N-Ar switching mode, the N content in steel is controlled to be below 40ppm, the slag quantity during tapping is controlled to be below 0.01% of the molten steel quantity, and the molten steel is strictly forbidden to be turned over greatly after tapping is finished, so that the cleanliness of the molten steel is ensured;
in the LF refining process, the refining time is controlled within 36min, the LF refining ensures submerged arc temperature rise, reduces nitrogen absorption in the power supply process, ferrotitanium is added for microalloying 10-15min before the refining is finished, the outgoing calcium wire is fed for 2 times under the control of 200m, and the level sum of inclusions in steel is effectively controlled not to exceed 1.5 level;
continuously casting to produce a plate blank with the thickness of 250mm, wherein the superheat degree of molten steel is controlled within the range of 10-25 ℃ in the continuous casting process, the drawing speed is controlled within 0.95-1.15m/min in the whole process, the fluctuation of the liquid level of a crystallizer is controlled within +/-3 mm, and secondary cooling water adopts the weak cooling ratio water amount of 0.6L/kg under dynamic soft pressure;
directly heating the casting blank to a heating furnace, wherein the heating time of the hot blank with the thickness of 250mm in the heating furnace is 2.5-3.0 hours; the high-pressure water dephosphorization adopts at least one-time dephosphorization to ensure that the upper surface and the lower surface of the billet have no iron scales;
after the casting blank is roughly rolled, the thickness of the intermediate blank is 85-90mm, the control temperature of finish rolling and initial rolling is 970 ℃, and the water outlet temperature range of the controlled cooling process is controlled to be 720 DEG; and (4) selecting straightening times according to the thickness specification and the plate shape condition of the steel plate until the steel plate is straightened.
The invention has the advantages and technical effects that: the production method of the low-alloy high-strength steel Q420C steel plate has the advantages that through reasonable component design, a low Mn-high Ti microalloy component system is adopted, the toughness is not reduced on the premise of ensuring the strength, an ideal F + P structure is obtained by adopting the processes of cleaning molten steel, optimizing temperature-controlled rolling and ACC controlled cooling, the crystal grains are uniform and fine, the mechanical property meets the requirements of GB/T1591 and 2018, the production cost is lower than that of other steel enterprises capable of producing Q420C, and the production method has stronger competitive advantages.
Drawings
FIG. 1 is a photograph showing the structure of a medium plate having a thickness of 16mm in example 1;
FIG. 2 is a photograph showing the structure of a medium plate having a thickness of 20mm in example 2;
FIG. 3 is a photograph showing the structure of a medium plate having a thickness of 25mm in example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The low-alloy high-strength steel Q420C steel plate comprises the following chemical components in percentage by mass: 0.16-0.20 percent of C, 0.15-0.30 percent of Si, 0.70-0.90 percent of Mn, 0.020 percent of P, 0.012 percent of S, 0.055-0.065 percent of Ti, 0.010-0.03 percent of Als, and the balance of Fe and residual elements;
the invention also provides a production method based on reduction of the production cost of the low-alloy high-strength steel Q420C steel plate, which sequentially comprises the steps of converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, rough rolling, finish rolling, laminar cooling, hot straightening, cooling by a cooling bed, shearing, sampling, inspecting and warehousing; the method is characterized in that:
the bottom blowing in the smelting process of the converter adopts an N-Ar switching mode, the N content in steel is controlled to be below 40ppm, the slag quantity during tapping is controlled to be below 0.01% of the molten steel quantity, and the molten steel is strictly forbidden to be turned over greatly after tapping is finished, so that the purity of the molten steel is ensured;
in the LF refining process, the refining time is controlled within 36min, the LF refining ensures submerged arc temperature rise, reduces nitrogen absorption in the power supply process, ferrotitanium is added for microalloying 10-15min before the refining is finished, the outgoing calcium wire is fed for 2 times under the control of 200m, and the level sum of inclusions in steel is effectively controlled not to exceed 1.5 level;
continuously casting to produce a plate blank with the thickness of 250mm, wherein the superheat degree of molten steel is controlled within the range of 10-25 ℃ in the continuous casting process, the drawing speed is controlled within 0.95-1.15m/min in the whole process, the fluctuation of the liquid level of a crystallizer is controlled within +/-3 mm, and secondary cooling water adopts the weak cooling ratio water amount of 0.6L/kg under dynamic soft pressure;
directly heating the casting blank to a heating furnace, wherein the heating time of the hot blank with the thickness of 250mm in the heating furnace is 2.5-3.0 hours; the high-pressure water dephosphorization adopts at least one-time dephosphorization to ensure that the upper surface and the lower surface of the billet have no iron scales;
the thickness of the intermediate billet after the casting blank is roughly rolled is required to be 85-90mm, the temperature of the finish rolling is controlled to be 970 ℃ at the beginning of the finish rolling, and the temperature range of the cooling water outlet is controlled to be 680-720 ℃; and selecting straightening times according to the thickness specification and the plate shape condition of the steel plate until the steel plate is straightened.
Please refer to fig. 1 to 3, examples 1 to 3; a continuous casting slab with the thickness of 250mm and the large section is selected to ensure the compression ratio, a Q420C finished steel plate with the thickness specification of 16-25mm is produced, an N-Ar switching mode is adopted in bottom blowing in the blowing process of a converter in the production process, the N content in steel is controlled to be below 40ppm, the slag discharge amount of tapping is controlled to be below 0.01% of the molten steel amount, and the molten steel is strictly forbidden to be turned over greatly after the tapping is finished, so that the purity of the molten steel is ensured. In the LF refining process, the refining time is controlled within 36min, the submerged arc temperature rise is ensured in the LF refining process, and the nitrogen absorption in the power supply process is reduced; lime, aluminum wires, aluminum particles and the like are adopted to make white slag for desulfurization, slag is rapidly formed, and the air quantity is reasonably controlled in the desulfurization process; adding ferrotitanium 10-15min before refining for microalloying, feeding the outgoing calcium wire for 2 times under the control of 200m, and controlling the outgoing S to be below 0.010%; the soft blowing time before sampling is not less than 6min after the component adjustment is finished; the grade sum of the inclusions in the steel is effectively controlled not to exceed 1.5 grade. The continuous casting is used for producing a plate blank with the thickness of 250mm, the superheat degree of molten steel is controlled within the range of 10-25 ℃, the drawing speed is controlled within 0.95-1.15m/min in the whole process, the fluctuation of the liquid level of a crystallizer is controlled within +/-3 mm, dynamic soft reduction is used, and the weak cooling specific water quantity of secondary cooling water is 0.6L/kg. The casting blank is sent to a heating furnace in a hot mode, and the heating time of the hot blank with the thickness of 250mm in the heating furnace is 2.5-3.0 hours; removing the phosphorus by using high-pressure water in one or more times to ensure that the upper and lower surfaces of the billet have no iron scales; the thickness of the intermediate billet after the rough rolling of the casting billet is required to be 85-95mm, the control temperature of finish rolling at the beginning is 930-; and selecting straightening times according to the thickness specification and the plate shape condition of the steel plate until the steel plate is straightened.
Table 1 lists the mass percentages and thickness specifications of the elements in the steels of examples 1-3; table 2 lists the controlled rolling + ACC cooling process parameters of examples 1-3; table 3 shows the mechanical properties of Q420C produced in examples 1-3.
Table 1 mass percent (wt%) of main chemical components of examples 1 to 3
Table 2 controlled rolling + ACC process of examples 1-3
TABLE 3 mechanical Properties of examples 1-3
| Examples | Tensile strength | Yield strength | Elongation percentage | Cold bending | 0 ℃ impact energy |
| 1 | 564 | 478 | 26 | Qualified | 71 |
| 2 | 549 | 456 | 23 | Qualified | 66 |
| 3 | 553 | 439 | 22 | Qualified | 69 |
Table 3 shows that the mechanical properties of the Q420C finished steel produced in the embodiments 1-3 completely meet the requirements of national standard GB/T1591-2018.
The production method of the low-alloy high-strength steel Q420C steel plate has the advantages that through reasonable component design, a low Mn-high Ti microalloy component system is adopted, the toughness is not reduced on the premise of ensuring the strength, an ideal F + P structure is obtained by adopting the processes of cleaning molten steel, optimizing temperature-controlled rolling and ACC controlled cooling, the crystal grains are uniform and fine, the mechanical property can meet the requirements of GB/T1591 and 2018, the production cost is lower than that of other steel enterprises capable of producing Q420C, and the method has strong competitive advantages.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A low-alloy high-strength steel Q420C steel plate; the steel plate comprises the following chemical components in percentage by mass: 0.16-0.20 percent of C, 0.15-0.30 percent of Si, 0.70-0.90 percent of Mn, 0.020 percent of P, 0.012 percent of S, 0.055-0.065 percent of Ti, 0.010-0.03 percent of Als, and the balance of Fe and residual elements;
the production method for reducing the production cost of the low-alloy high-strength steel Q420C steel plate sequentially comprises the steps of converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, rough rolling, finish rolling, laminar cooling, thermal straightening, cooling by a cooling bed, shearing, sampling, inspecting and warehousing; the method is characterized in that:
the bottom blowing in the converter smelting process adopts an N-Ar switching mode, the N content in steel is controlled to be below 40ppm, the slag quantity during tapping is controlled to be below 0.01% of the molten steel quantity, and the molten steel is strictly forbidden to be turned over greatly after tapping is finished, so that the cleanliness of the molten steel is ensured;
in the LF refining process, the refining time is controlled within 36min, the LF refining ensures submerged arc temperature rise, reduces nitrogen absorption in the power supply process, ferrotitanium is added for microalloying 10-15min before the refining is finished, the outgoing calcium wire is fed for 2 times under the control of 200m, and the level sum of inclusions in steel is effectively controlled not to exceed 1.5 level;
continuously casting to produce a plate blank with the thickness of 250mm, wherein the superheat degree of molten steel is controlled within the range of 10-25 ℃ in the continuous casting process, the drawing speed is controlled within 0.95-1.15m/min in the whole process, the fluctuation of the liquid level of a crystallizer is controlled within +/-3 mm, and secondary cooling water adopts the weak cooling ratio water amount of 0.6L/kg under dynamic soft pressure;
directly heating the casting blank to a heating furnace, wherein the heating time of the hot blank with the thickness of 250mm in the heating furnace is 2.5-3.0 hours; the high-pressure water dephosphorization adopts at least one dephosphorization to ensure that no iron scale is formed on the upper and lower surfaces of the billet;
the thickness of the casting blank rough rolling intermediate blank is required to be 85-90mm, the temperature of finish rolling is controlled to be 970 ℃, and the temperature range of the controlled cooling water outlet is controlled to be 680-720 ℃; and selecting straightening times according to the thickness specification and the plate shape condition of the steel plate until the steel plate is straightened.
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| PCT/CN2021/115468 WO2022127192A1 (en) | 2020-12-18 | 2021-08-30 | Low-alloy high-strength q420c steel plate and production method therefor |
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| CN112725691B (en) * | 2020-12-18 | 2022-05-17 | 天津钢铁集团有限公司 | Low-alloy high-strength steel Q420C steel plate and production method thereof |
| CN113857451B (en) * | 2021-10-27 | 2023-04-11 | 江西理工大学 | Continuous casting method for controlling distribution of manganese sulfide inclusions in medium carbon steel in thickness direction of continuous casting slab |
| CN115323269A (en) * | 2022-07-21 | 2022-11-11 | 阳春新钢铁有限责任公司 | Method for controlling cracks of Q235 round steel under high drawing speed condition |
| CN115466828B (en) * | 2022-08-23 | 2023-08-22 | 石钢京诚装备技术有限公司 | Production method for improving bending degree of low-alloy high-strength steel |
| CN115415495B (en) * | 2022-09-05 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Control method for edge crack defect of Q355B titanium-added steel produced by CSP sheet billet continuous casting and rolling production line |
| CN115612799B (en) * | 2022-10-24 | 2024-06-11 | 江苏利淮钢铁有限公司 | Online normalizing device and online normalizing process for low-alloy high-strength steel |
| CN115786814B (en) * | 2023-01-13 | 2023-06-06 | 山西建龙实业有限公司 | Preparation process of high-strength low-alloy structural steel and hot-rolled steel strip thereof |
| CN116460262B (en) * | 2023-04-24 | 2024-07-30 | 北京科技大学 | Low-carbon steel medium plate continuous casting production process for reducing banded structure rating |
| CN117604389B (en) * | 2023-12-09 | 2024-04-30 | 河北普阳钢铁有限公司 | Production method of 420 MPa-level low-alloy high-strength steel easy to weld |
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| JP2008156680A (en) * | 2006-12-21 | 2008-07-10 | Nippon Steel Corp | High-strength cold rolled steel sheet having high yield ratio, and its production method |
| CN104018063A (en) * | 2014-06-18 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | Low alloy and high strength Q420C medium steel plate and production method thereof |
| CN111455267A (en) * | 2020-03-06 | 2020-07-28 | 广西盛隆冶金有限公司 | High-strength and high-toughness J55 hot rolled steel strip and production method thereof |
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| CN107385329B (en) * | 2017-06-30 | 2019-04-26 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength building structural steel plate and its manufacturing method |
| CN111560561A (en) * | 2020-04-17 | 2020-08-21 | 南京钢铁股份有限公司 | 355 MPa-grade low-alloy high-fatigue steel and manufacturing method thereof |
| CN112725691B (en) * | 2020-12-18 | 2022-05-17 | 天津钢铁集团有限公司 | Low-alloy high-strength steel Q420C steel plate and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008156680A (en) * | 2006-12-21 | 2008-07-10 | Nippon Steel Corp | High-strength cold rolled steel sheet having high yield ratio, and its production method |
| CN104018063A (en) * | 2014-06-18 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | Low alloy and high strength Q420C medium steel plate and production method thereof |
| CN111455267A (en) * | 2020-03-06 | 2020-07-28 | 广西盛隆冶金有限公司 | High-strength and high-toughness J55 hot rolled steel strip and production method thereof |
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| CN112725691A (en) | 2021-04-30 |
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