CN110616377A - Production method of low-yield-ratio high-toughness Q460GJ - Google Patents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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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- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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Abstract
A production method of low yield ratio and high toughness Q460GJ is characterized in that the steel comprises the following chemical components of C =0.06-0.08, Si =0.15 ~ 0.25, Mn =1.5-1.6, P:nomore than 0.015, S no more than 0.002, Cr =0.25 ~ 0.3.3, Nb =0.4 ~ 0.5, V =0.3 ~ 0.5.5, Ti =0.01 ~ 0.03.03, and the balance Fe and inevitable impurities in percentage by mass, and the Q460GJ steel plate with the thickness no more than 80mm is produced by adopting a low-carbon microalloying component design and a TMCP mode without heat treatment, the yield strength no less than 460MPa, the yield ratio no more than 0.8 and the impact at 40 ℃ is more than 100J, the Z-direction tensile section has low shrinkage rate no less than 40%, and the steel has the characteristics of low cost and excellent performance.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of a 460 MPa-level steel plate for a building.
Background
The steel for construction is steel widely applied to steel structure buildings such as super high-rise buildings, stations, airports, convention and exhibition centers and the like. The steel for construction has the characteristics of high construction speed, good shock resistance, environmental friendliness and the like. The Q460GJ grade steel for building structure has been widely used in various heavy projects, which can effectively reduce the dead weight of the steel structure and provide higher structural strength.
The 460-grade steel for building structures has high strength requirement and strict requirement on yield ratio, so that a multi-phase structure is mostly adopted, the proportion requirement between phases is strict, and the toughness of the thick plate is difficult to guarantee, so that the thick plate is mostly produced by adopting a heat treatment process. In the prior art, the process is more, the alloy is added more, and the popularization and the use of the grade steel are not facilitated.
Chinese patent CN1537968 "steel plate for building structure with 460MPa grade of yield strength and manufacturing method thereof" discloses a steel plate for building with low yield ratio Q460GJ and production method thereof, the chemical components of the steel plate are as follows according to weight percentage: c: 0.17 to 0.19%, Si 0.35 to 0.45%, Mn: 1.50-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Nb: 0.03-0.04%, V: 0.05-0.06%, Ti: 0.01-0.02%, Als: 0.020-0.040%, and the balance of Fe and impurities. The high C content is adopted, so that the final cooling temperature is high, the method is not suitable for producing thick plates, and the Z-directional performance of the steel plate cannot meet the requirement of Z35, so that the requirement of key components is difficult to meet.
Chinese patent CN102400053B 'Steel plate for building structure with 460MPa grade yield strength and manufacturing method thereof', the steel plate comprises the following chemical components by weight percent: 0.05 to 0.10 percent of C, 0.2 to 0.3 percent of Si, 1.40 to 1.60 percent of Mn, 0.025 to 0.060 percent of Nb0.025 to 0.060 percent of Ti, 0.015 to 0.030 percent of Als, 0.015 to 0.045 percent of Als, 0.2 to 0.4 percent of Cr0.10 to 0.30 percent of Mo0.0010 to 0.0020 percent of B, the balance of Fe and inevitable impurities, the content of impurity elements is controlled to be less than or equal to 0.015 percent of P, the content of S is less than or equal to 0.005 percent of N, the content of N is less than or equal to 0.0040 percent of O, and the content of O is less than or equal to 0. The design of 3 or more components and the control scheme of the rolling process are involved, but the rolling process needs to be relaxed at a temperature, tempering is needed after rolling, and only a sheet below 30mm can be produced.
Chinese patent CN 101613828' a super-thick steel plate for construction with 460MPa grade yield strength and low yield ratio and a manufacturing method thereof, the steel plate comprises the following components by weight percent: 0.14 to 0.18 percent of C, 0.35 to 0.45 percent of Si, 1.40 to 1.50 percent of Mn, 0.025 to 0.035 percent of Nb, 0.040 to 0.050 percent of V, 0.010 to 0.020 percent of Ti, and the balance of Fe. The rolling process comprises the following steps: the steel plate with the thickness of more than or equal to 80mm is obtained after two-stage controlled rolling. The quenching and tempering treatment is adopted, the production period is longer, and the rapid delivery is not suitable.
Chinese patent CN 107620003' an economical low yield ratio Q460GJC steel plate and a production method thereof, the steel plate comprises the following chemical components by weight percent: c: 0.12 to 0.14%, Si: 0.20 to 0.50%, Mn: 1.45-1.55%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, and V: 0.03-0.05%, Nb: 0.03-0.04%, Al: 0.020-0.050%, and the balance of Fe and other inevitable impurities. The production cost is low, a thick plate with the thickness of about 80mm can be produced, but the impact is low, and the impact at 0 ℃ can be ensured only.
Disclosure of Invention
The invention aims to provide a production method of low-yield-ratio high-toughness Q460GJ, which is used for producing low-yield-ratio high-toughness Q460GJ steel for building structures through conventional production equipment of a steel mill. Through the optimized design of components, relaxation and heat treatment are not needed, the short-flow production does not influence the normal production rhythm, the influence of the environmental temperature is small, the rolling yield is high, the toughness is high and stable, and the method is suitable for batch production.
The invention is realized by the following technical scheme:
a production method of low yield ratio high toughness Q460GJ comprises the following steps of smelting, continuous casting, rolling, rapid cooling and finishing, wherein the steel comprises the following chemical components by mass percent, C =0.06-0.08, Si =0.15 ~ 0.25.25, Mn =1.5-1.6, P:nomore than 0.015, S no more than 0.002, Cr =0.25 ~ 0.3, Nb =0.4 ~ 0.5.5, V =0.3 ~ 0.5, Ti =0.01 ~ 0.03.03, and the balance of Fe and inevitable impurities:
(1) smelting: adopting a BOF-LF-RH production process path, controlling O in converter smelting to be less than or equal to 1000ppm, adopting high-alkalinity slag in a refining LF furnace, and stirring for desulfurization; controlling Al to be less than or equal to 0.035% in the process, and performing calcium treatment before leaving the station; the RH furnace production adopts a deep degassing process, and the total vacuum treatment time is more than or equal to 10 min;
(2) continuous casting, wherein the superheat degree is controlled at 10 ℃ of ~ 20 ℃, constant drawing speed casting is carried out, secondary cooling adopts weak cooling, the end soft reduction adopts 6mm large reduction, and the low power segregation is controlled below the national standard C class 1.5;
(3) rolling: hot charging and hot conveying are adopted, the materials are charged at the temperature of more than 600 ℃, and the heat preservation temperature is 1180-1220 ℃; two-stage rolling is adopted, the initial rolling temperature of rough rolling is more than or equal to 1000 ℃, the thickness of the rough rolling is more than 1.5 times of the target thickness, the cumulative reduction rate of the last three times is more than or equal to 50%, and the initial rolling temperature of the two stages is 780-820 ℃;
(4) and (3) rapidly cooling, namely directly performing laminar cooling on the rolled material at a cooling speed of 5 ℃/s ~ 10 ℃/s to 450 ℃ and ~ 550 ℃ and then stacking for slow cooling, and performing a fire cutting process after the slow cooling is carried out to the room temperature.
The Q460GJ steel plate for construction produced by the method has the yield strength of 480-560MPa, the tensile strength of 600-700MPa, the elongation of more than 20 percent, the yield ratio of less than or equal to 0.8, the Z-direction tensile surface shrinkage of more than or equal to 40 percent, and the impact at minus 40 ℃ of more than 100J.
The invention is suitable for producing the steel plate with the thickness of Q460GJD/Q460GJE being less than 80 mm. The welding material has the advantages of good obdurability matching, low yield ratio, low carbon equivalent, excellent welding performance and stronger lamellar tearing resistance, can meet various requirements of GB/T19879-2015, and is suitable for manufacturing main components of super high-rise buildings and large public buildings.
The outstanding characteristics of the invention are that Q460GJ with excellent performances can be produced through the optimized design of components without any relaxation or heat treatment, and the batch production of the Q460GJ thick plate can be realized at lower cost through the strict control of each procedure.
Drawings
FIG. 1 is a flow chart of a steel sheet production process.
FIG. 2 is a diagram showing the gold phase 1/2 of the structure of a 80mm Q460GJ steel plate.
Detailed Description
The following will further explain the main contents of the present invention, such as the control range and the best mode, by referring to the following examples:
smelting example 1:
the converter smelting is performed once, the end point control C =0.05%, the end point oxygen content O =670ppm, the LF is desulfurized by adopting high-alkalinity slag, the maximum aluminum content Al = 0.025% in the process, and Al is alloyed before the furnace is out of service. RH furnace vacuum treatment time 11min, residual H =1.5ppm was measured. The continuous casting adopts a 300mm thick section, the superheat degree is 12-18 ℃, the whole process drawing speed is 0.8m/min, and the total amount under light pressure is 6 mm. The rolling adopts hot charging and hot conveying, the furnace is charged within 8 hours, the hot charging temperature is 670 ℃, and the core temperature of the heat preservation section of the heating furnace is 1205 ℃. And (3) keeping the temperature for 20 ℃, then starting rolling, wherein the initial rough rolling temperature is 1050 ℃, the final three-pass accumulated reduction rate is 58%, the thickness of the intermediate billet is 135mm, and the initial rough rolling temperature is 785 ℃, and the intermediate billet is rolled to be 80mm thick. Directly entering mulpic laminar cooling after rolling, and returning the temperature to 480 ℃ and the cooling speed to about 6 ℃/s. After the hot straightening, stacking and slowly cooling.
Smelting example 2:
the converter smelting is performed once, C =0.04%, the end point O content is 870ppm, the LF is desulfurized by high-alkalinity slag, the maximum Al content in the process is 0.023%, and Al is alloyed before leaving the station. RH furnace vacuum treatment time 11min, residual H =1.4ppm was measured. The cross section is produced by continuous casting with the thickness of 300 mm. The superheat degree is 13-18 ℃, the whole process drawing speed is 0.8m/min, and the total amount under light pressure is 6 mm. The rolling adopts hot charging and hot delivery, the furnace is charged within 8h, the hot charging temperature is 675 ℃, the core temperature of the heat preservation section of the heating furnace is 1215 ℃, the rolling is started after the heat preservation is carried out for 20min, the initial rolling temperature of rough rolling is 1050 ℃, the final three times of accumulated reduction rate is 57%, the thickness of the intermediate blank is 135mm, and the initial rolling temperature of rough rolling is 790 ℃, and the thickness of the intermediate blank is 80 mm. Directly entering mulpic laminar cooling after rolling, and returning the red temperature to 490 ℃ at the cooling speed of 6 ℃/s. After the hot straightening, stacking and slowly cooling.
Smelting example 3:
smelting in a converter for one time, controlling C =0.05%, controlling the end oxygen content O =740ppm, desulfurizing LF by using high-alkalinity slag, controlling the maximum Al content in the process to be 0.026%, alloying Al before leaving the station, carrying out RH furnace vacuum treatment for 11min, measuring the residual H =1.4ppm, continuously casting by using a 300mm thick production section, the superheat degree of 14 ℃ of ~ 20 ℃, the whole drawing speed to be 0.8m/min, the total amount under light pressure to be 6mm, carrying out hot charging and hot delivery in rolling, charging the furnace within 8H, the hot charging temperature to be 680 ℃, the core temperature of a heat preservation section of the heating furnace to be 1210 ℃, carrying out heat preservation for 20min, then carrying out rolling, carrying out rough rolling at the beginning temperature of 1030 ℃, finally carrying out three times of accumulated reduction rate of 59%, the thickness of an intermediate billet to be 135mm, carrying out rough rolling at the beginning temperature of 790 ℃, carrying out rolling to be 80mm thick, directly carrying out mulpic laminar cooling, returning the red temperature, carrying.
Smelting example 4:
smelting in a converter for one time, wherein the end point C =0.04%, the end point oxygen content O = 890ppm, desulfurizing with high-alkalinity slag for LF, the maximum Al content Al =0.028% in the process, alloying with Al before leaving the station, and carrying out RH furnace vacuum treatment for 11min to obtain the residual H =1.3ppm, continuously casting with a 300mm thick production section, the superheat degree of 15 ℃ of ~ 19 ℃, the whole drawing speed of 0.8m/min, the total light reduction of 6mm, carrying out hot charging and hot delivery for rolling, charging into the furnace within 8H, the hot charging temperature of 705 ℃, the core temperature of a heat preservation section of the heating furnace of 1190 ℃, carrying out heat preservation for 20min, then carrying out rolling, the rough rolling temperature of 1030 ℃, the final three times of cumulative reduction of 56%, the thickness of an intermediate billet of 140mm, the rough rolling temperature of 800 ℃, rolling into the thickness of 80mm, directly carrying out mulpic laminar cooling, returning the red temperature of 500 ℃, and carrying out hot straightening at the cooling speed of about 6 ℃/s.
The components of each smelting example are controlled as shown in the following table 1:
table 1 examples control ingredients (wt%)
TABLE 2 examples Properties (impact temperature-40 ℃ C.)
As can be seen from Table 2, all indexes of the material meet the requirements of GB/T19879-2015 for construction steel, and the strength and yield ratio are relatively stable, which shows that the steel plate has excellent shock resistance, particularly has high impact at-40 ℃ and is basically stable at 300J or more. Therefore, the steel plate of the invention has excellent comprehensive mechanical properties. The material can be applied to super high-rise buildings, factories and mines, towers, large-span and large-scale structural engineering and the like, and can be suitable for buildings with lower environmental temperature or high requirements on low-temperature impact toughness.
As can be seen from fig. 2: the structure is composed of ferrite, acicular ferrite and granular bainite. The whole structure is uniform and fine, and is an ideal structure of the grade steel.
Claims (1)
1. A production method of low yield ratio high toughness Q460GJ is characterized in that the steel comprises the following chemical components by mass percent of C =0.06-0.08, Si =0.15 ~ 0.25.25, Mn =1.5-1.6, P:nomore than 0.015, S no more than 0.002, Cr =0.25 ~ 0.3.3, Nb =0.4 ~ 0.5.5, V =0.3 ~ 0.5.5, Ti =0.01 ~ 0.03.03, and the balance of Fe and inevitable impurities, and comprises the following process steps:
(1) smelting: adopting a BOF-LF-RH production process path, controlling O in converter smelting to be less than or equal to 1000ppm, adopting high-alkalinity slag in a refining LF furnace, and stirring for desulfurization; controlling Al to be less than or equal to 0.035% in the process, and performing calcium treatment before leaving the station; the RH furnace production adopts a deep degassing process, and the total vacuum treatment time is more than or equal to 10 min;
(2) continuous casting, wherein the superheat degree is controlled at 10 ℃ of ~ 20 ℃, constant drawing speed casting is carried out, secondary cooling adopts weak cooling, the end soft reduction adopts 6mm large reduction, and the low power segregation is controlled below the national standard C class 1.5;
(3) rolling: hot charging and hot conveying are adopted, the materials are charged at the temperature of more than 600 ℃, and the heat preservation temperature is 1180-1220 ℃; two-stage rolling is adopted, the initial rolling temperature of rough rolling is more than or equal to 1000 ℃, the thickness of the rough rolling is more than 1.5 times of the target thickness, the cumulative reduction rate of the last three times is more than or equal to 50%, and the initial rolling temperature of the two stages is 780-820 ℃;
(4) and (3) rapidly cooling, namely directly performing laminar cooling on the rolled material at a cooling speed of 5 ℃/s ~ 10 ℃/s to 450 ℃ and ~ 550 ℃ and then stacking for slow cooling, and performing a fire cutting process after the slow cooling is carried out to the room temperature.
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Cited By (4)
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| CN114525457A (en) * | 2022-02-27 | 2022-05-24 | 湖南华菱湘潭钢铁有限公司 | Thick-specification low-temperature steel for ship containing liquefied petroleum gas and liquid ammonia and production method thereof |
| CN114570898A (en) * | 2022-03-26 | 2022-06-03 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio low-alloy high-strength steel plate |
| CN115094340A (en) * | 2022-07-28 | 2022-09-23 | 湖南华菱湘潭钢铁有限公司 | Production method of Q500GJ steel plate with low yield strength and toughness ratio |
| CN115216681A (en) * | 2022-07-28 | 2022-10-21 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio high-toughness Q620GJ |
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| CN114525457A (en) * | 2022-02-27 | 2022-05-24 | 湖南华菱湘潭钢铁有限公司 | Thick-specification low-temperature steel for ship containing liquefied petroleum gas and liquid ammonia and production method thereof |
| CN114570898A (en) * | 2022-03-26 | 2022-06-03 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio low-alloy high-strength steel plate |
| CN115094340A (en) * | 2022-07-28 | 2022-09-23 | 湖南华菱湘潭钢铁有限公司 | Production method of Q500GJ steel plate with low yield strength and toughness ratio |
| CN115216681A (en) * | 2022-07-28 | 2022-10-21 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio high-toughness Q620GJ |
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