CN114293094B - 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and production method thereof - Google Patents
450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 240
- 239000010959 steel Substances 0.000 title claims abstract description 240
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 239000010936 titanium Substances 0.000 claims abstract description 76
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 51
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 37
- 239000000956 alloy Substances 0.000 claims abstract description 37
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 54
- 238000009749 continuous casting Methods 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 43
- 238000007670 refining Methods 0.000 claims description 42
- 238000001816 cooling Methods 0.000 claims description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 229910052698 phosphorus Inorganic materials 0.000 claims description 24
- 229910052717 sulfur Inorganic materials 0.000 claims description 24
- 238000010079 rubber tapping Methods 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000003723 Smelting Methods 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 12
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 11
- 238000005275 alloying Methods 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 238000005728 strengthening Methods 0.000 abstract description 16
- 230000000052 comparative effect Effects 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 description 34
- 238000005260 corrosion Methods 0.000 description 34
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 30
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 22
- 239000011575 calcium Substances 0.000 description 11
- 238000001556 precipitation Methods 0.000 description 10
- 239000000047 product Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 229910000720 Silicomanganese Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000600 Ba alloy Inorganic materials 0.000 description 1
- 229910000882 Ca alloy Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 241000234314 Zingiber Species 0.000 description 1
- 235000006886 Zingiber officinale Nutrition 0.000 description 1
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
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- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- 239000010436 fluorite Substances 0.000 description 1
- 235000008397 ginger Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of steel production, in particular to 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and a production method thereof. Based on the total mass of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel, the vanadium-titanium microalloyed weather-resistant B-shaped steel comprises the following chemical components in percentage by mass: c:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, V:0.01 to 0.15%, ti: 0.01-0.15%, and the content of V and Ti satisfies 0.10 < [ V ]]+1.86[Ti]－5.88[Ti] 2 Is less than 0.22. According to the embodiment and the comparative example, the reasonable matching relationship of the alloy elements is limited, so that the strengthening effect of the alloy elements is effectively improved, the alloy cost is obviously reduced, and the comprehensive performance of the material is stably improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and a production method thereof.
Background
The central beam of the wagon is a main key component of the railway transportation wagon, is the most important part of the wagon with the largest stress, and is called the ridge beam of the wagon, and the strength of the ridge beam directly influences the structural performance of a carriage. With the requirement of increasing the speed and reducing the weight of the railway, the requirement on the center sill is higher and higher. The B-shaped steel is special steel for manufacturing the center sill of the train carriage. Along with the development of railway acceleration and heavy load in China, the steel has higher requirements on the performance of the B-shaped steel, and has stronger atmospheric corrosion resistance while meeting the requirements on strength and low-temperature impact toughness. In general, the B-type steel is mainly based on a vanadium microalloying technology, the strength is improved by precipitating vanadium carbonitride, and the weather resistance and corrosion resistance of the steel are improved by adding Cu, ni and Cr. The high price of vanadium alloy leads to the increase of the production cost. By using the titanium element with lower cost, the alloy components and the smelting production process are reasonably and optimally designed, so that the strengthening effect of the vanadium and titanium microalloy elements is exerted to the greatest extent. The development and application of the vanadium-titanium composite microalloyed Z-shaped steel have important significance for promoting energy conservation and consumption reduction of the steel industry, meeting the requirements of the railway transportation high-speed heavy-load spanning development and realizing the upgrading and updating of railway vehicles.
Patent application CN110846578A discloses a high-strength weather-resistant hot-rolled 310B-shaped steel with low surface crack rate and a preparation method thereof, which realizes that the steel meets the performance requirement by reasonably matching the technical processes of pulling speed, superheat degree, crystallizer water, secondary cooling water, reasonably selecting protective slag and the like according to the component characteristics of molten steel, and the chemical components are as follows: c:0.13 to 0.14%, si:0.38% -0.43%, mn:1.38% -1.40%, cr:0.233 to 0.237%, ni:0.284 to 0.298%, cu:0.265% -0.316%, V:0.085 to 0.094 percent, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance of Fe and inevitable impurities. The Z-shaped steel utilizes the vanadium microalloying strengthening effect to improve the strength of steel, so that the production cost is increased.
The document "ginger degang, intellectual building, liu zheng, vanadium-nitrogen microalloying improves the low-temperature impact toughness [ J ] of high-strength steel, steeling science, 2008, 34 (4): 52-55 introduction, the design of the chemical components of YQ450NQRL high-strength weather-resistant 310B-shaped steel adopts V and N microalloying, and the low-temperature impact toughness of the B-shaped steel is effectively improved. The B-shaped steel improves the strength and toughness by means of single vanadium microalloying strengthening action, and the production cost is high.
From the prior art, the production of the traditional B-shaped steel mainly adopts vanadium microalloying, the strength of the steel is improved through the precipitation strengthening effect of vanadium carbonitride, and the weather resistance and corrosion resistance of the steel are improved by adding Cu, ni and Cr. However, vanadium belongs to a precious metal resource, and the alloy is expensive, so that the production cost of the B-shaped steel is obviously increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and a production method thereof. The technical scheme of the invention carries out scientific and reasonable optimization design on the alloy components of the vanadium-titanium microalloying weather-resistant B-shaped steel at the level of 450MPa and the smelting production process, limits the matching relation of the V content and the Ti content, enables the strengthening effect of microalloy elements to be exerted to the maximum extent, optimizes the type and distribution of oxides in the steel and improves the comprehensive service performance of the steel. The invention overcomes the problems that the prior hot-rolled B-shaped steel has single production component system, namely mainly depends on the vanadium microalloying means, resulting in high content of alloy elements, low alloy utilization rate and large consumption of valuable alloy resources, improves the alloy utilization efficiency, saves the alloy resources and reduces the production cost through the reasonable matching of V and Ti binary microalloying elements; meanwhile, by regulating and controlling the oxide in the steel, the adverse effect of titanium microalloying is overcome, and the product performance is ensured.
In order to achieve the above purpose, one aspect of the present invention provides a 450MPa grade vanadium-titanium microalloyed weather-resistant type-b steel, which takes the total mass of the 450MPa grade vanadium-titanium microalloyed weather-resistant type-b steel as a reference, and comprises the following chemical components by mass: c:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo:0.0001 to 0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B: 0.0001-0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, and the balance of Fe and inevitable impurities;
wherein, the contents of V and Ti satisfy the following relational expression:
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element in%.
The invention provides a production method of 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel, which comprises the following steps:
(1) Making steel
Smelting desulfurized molten iron and/or waste steel materials into molten steel; when the temperature of the molten steel reaches 1600-1750 ℃, the components of the molten steel reach C:0.02 to 0.08%, P:0.003 to 0.02%, S: tapping when the content is 0.001-0.025 percent;
in the tapping process, adding deoxidized alloy and a slag former into a ladle;
(2) Refining
Conveying the ladle to a refining station for refining; in the refining process, power is supplied and the temperature is raised, white slag is produced for desulfurization, and deoxidation and alloying are carried out; according to the component requirements of the vanadium-titanium microalloying weather-resistant B-shaped steel of 450MPa level, the components of the molten steel are adjusted to reach C:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo: 0.0001-0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B:0.0001 to 0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, in the process of adjusting the components, firstly adjusting the mass fraction of V to 0.01 to 0.15 percent, then adjusting the content of Ti according to the following formula (1) to obtain molten steel with qualified components,
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element, and the unit is%;
(3) Continuous casting
Sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet;
(4) Rolling of
Directly feeding the continuous casting billet into a B-shaped steel rolling unit for rolling, or feeding the continuous casting billet into the B-shaped steel rolling unit for rolling after reheating; the initial rolling temperature of the casting blank is 1100-1280 ℃, and the final rolling temperature is 750-950 ℃, so that the hot rolled B-shaped steel is obtained; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel with the grade of 450 MPa.
The principle and the design idea of the technical scheme of the invention are as follows:
the weather-resistant B-shaped steel is applied to the manufacture of railway transportation vehicles and has higher requirements on the product performance and quality of steel products. On the one hand, good comprehensive mechanical properties, namely, sufficiently high strength and low-temperature toughness, are required; on the other hand, the coating has excellent weather resistance and can be used in an atmospheric corrosion environment for a long time. At present, the production of B-shaped steel generally adopts a vanadium microalloying method, and the strength of the steel is improved through the precipitation strengthening effect of vanadium carbonitride. In the component design, the weather resistance and corrosion resistance of steel are improved mainly by adding Cu, ni and Cr, and the adverse effects of nonmetallic inclusions on the mechanical property and the weather resistance are reduced by adopting a refining means. However, vanadium belongs to a precious metal resource, and the alloy is expensive, so that the production cost of the B-shaped steel is obviously increased. And along with the increase of the vanadium content, the strengthening contribution rate of unit content is reduced, namely the utilization rate of alloy elements is reduced, and the waste of precious alloy elements is caused. The titanium microalloying has obvious cost advantage, and the reasonable matching of titanium and vanadium can promote the precipitation strengthening effect and improve the utilization rate of alloy elements. However, titanium is more active than vanadium in chemical properties, has a plurality of existing states in steel, and has more complicated precipitation behavior than vanadium, so that great difficulty exists in practical application.
Aiming at the problems, a large number of theoretical and experimental researches are developed, and the design scheme and the production process of the active ingredients of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel are determined. The vanadium has high solubility in austenite in steel, the precipitation behavior is simple, most of the vanadium is precipitated in the cooling phase transformation process after hot rolling, and the addition amount of the vanadium needs to be greatly increased in order to achieve a sufficient precipitation strengthening effect. However, titanium precipitates at a temperature higher than that of vanadium, and a large amount of titanium precipitates in austenite at the high-temperature rolling stage. The rolling deformation process of the B-shaped steel is more complex compared with the rolling deformation process of plate strip steel and bar wire products, so that the precipitation behavior of titanium is more complicated. Improper distribution of the amount of titanium precipitated during the deformation and cooling processes can adversely affect product performance. The carbonitride precipitate phases of vanadium and titanium have the same crystal structure type, and the two phases can mutually dissolve to form composite precipitates. In the research process of the invention, the vanadium and titanium can be mutually promoted under the condition of reasonable matching of the contents of the vanadium and the titanium, so that the precipitation process is more stable and uniform, and a better precipitation strengthening effect is exerted. Meanwhile, when the contents of vanadium and titanium are not properly matched, precipitation behavior and strengthening effect are weakened, the expected purpose cannot be achieved, and even the performance of steel cannot meet the standard requirements or alloy elements are wasted. According to the invention, through a large amount of experimental researches, the effective vanadium and titanium content range is optimized, and nonlinear regression is carried out to obtain the optimal matching relation of the vanadium and titanium content suitable for the performance requirement of 450MPa grade B-shaped steel and the production process.
On the other hand, titanium has high affinity with oxygen and nitrogen, and oxygen and nitride of titanium with large size are easily generated in the steel smelting process, so that the mechanical property of the steel is reduced, and the weather resistance and corrosion resistance are also adversely affected. Aiming at the problem, the invention further improves the refining process, controls the fine dispersion distribution of oxides in the steel, ensures that the titanium element effectively plays a strengthening role, and eliminates the adverse effect on the comprehensive performance. Under the component design scheme and the smelting production process, the strengthening effect of the alloy elements is effectively improved, the alloy cost is obviously reduced, and the comprehensive performance of the material is stably improved.
The invention has the advantages and beneficial effects that:
(1) The invention breaks through the microalloying means mainly based on vanadium in the existing B-shaped steel production technology, adopts a cheaper vanadium-titanium composite microalloying scheme, reduces the alloy cost, improves the economic benefit and is beneficial to saving precious alloy resources.
(2) The invention overcomes the difficulty of applying titanium in hot rolling the B-shaped steel, ensures the full and effective exertion of the strengthening effect, improves the utilization rate of alloy elements, solves the long-standing problem of the steel industry, and is beneficial to popularization and application in the industry.
(3) The invention improves the alloy components and the smelting production process synergistically, reduces the alloy cost, improves the mechanical property and the weather-proof and corrosion-resistant properties, and further improves the comprehensive service performance of the material compared with the product of the conventional process.
Detailed Description
The following describes the embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel, which takes the total mass of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel as a reference, and comprises the following chemical components in percentage by mass: c:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo: 0.0001-0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B:0.0001 to 0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, and the balance of Fe and inevitable impurities;
wherein, the contents of V and Ti satisfy the following relational expression:
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element in%.
In a preferred embodiment, the number of oxide particles having a size of 0.25 to 5 μm and containing two or more elements of Al, ca, mg, zr, ba, RE in the B-type steel is 200 to 2000/mm 2 。
More preferably, in the oxide particles having a size of 0.25 to 5 μm and containing two or more elements of Al, ca, mg, zr, ba, RE, 10 to 90% by number of the oxide particles further contain titanium oxide and/or titanium nitride, and the average volume ratio of titanium oxide and/or titanium nitride in the whole particles is < 50%, preferably 5 to 30%, and specifically may be 12%, 15%, or 16%, for example.
More preferably, the sum of the mass fractions of the elements Ca, mg, zr, ba and RE in the B-shaped steel is 0.001 to 0.01%, and specifically, for example, may be 0.003%, 0.004%, 0.006% or 0.01%.
The preferable performances of the 450 MPa-grade vanadium-titanium microalloying weather-resistant B-shaped steel are as follows: yield strength is more than or equal to 450MPa, impact toughness AK at-40 DEG C V The corrosion resistance is not more than 47J, and the relative corrosion rate of the corrosion resistance is not more than 50 percent compared with that of a Q345B standard sample.
The invention also provides a production method of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel, and the invention adopts vanadium-titanium composite microalloying to replace single vanadium microalloying, thereby reducing the production cost of the B-shaped steel and improving the comprehensive performance of steel. Specifically, the production method of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel comprises the following steps:
(1) Steelmaking
Smelting desulfurized molten iron and/or waste steel materials into molten steel; when the temperature of the molten steel reaches 1600-1750 ℃, the components of the molten steel reach C:0.02 to 0.08%, P:0.003 to 0.02%, S: tapping when the content is 0.001-0.025 percent;
in the tapping process, deoxidized alloy and slag former are added into a ladle;
(2) Refining of
Conveying the ladle to a refining station for refining; in the refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; according to the component requirements of 450 MPa-grade vanadium-titanium microalloying weather-resistant B-shaped steel, the components of molten steel are adjusted to reach C:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo: 0.0001-0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B: 0.0001-0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, in the process of adjusting the components, firstly adjusting the mass fraction of V to 0.01 to 0.15 percent, then adjusting the content of Ti according to the following formula (1) to obtain molten steel with qualified components,
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element, and the unit is%;
(3) Continuous casting
Sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet;
(4) Rolling of
Directly feeding the continuous casting billet into a B-shaped steel rolling unit for rolling, or feeding the continuous casting billet into the B-shaped steel rolling unit for rolling after reheating; the initial rolling temperature of the casting blank is 1100-1280 ℃, the final rolling temperature is 750-950 ℃, and hot-rolled B-shaped steel is obtained; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel with the grade of 450 MPa.
In the present invention, the deoxidized alloy may be at least one of silicon, manganese, aluminum, calcium, barium, and a deoxidizer commonly used in steel making.
In the present invention, the slag former may be at least one of calcium oxide, pre-melted slag, and a slag former commonly used in steel making.
In a preferred embodiment, in step (1), the mass fractions of Mo and B in the molten steel during tapping satisfy Mo: 0.0001-0.02%, B:0.0001 to 0.002 percent.
In a preferred embodiment, in the step (2), argon or nitrogen is bottom-blown into the ladle during the refining of the molten steel;
in a preferred embodiment, in step (2), the molten steel is further subjected to RH or VD refining.
In a preferred embodiment, in the step (2), when the oxygen mass fraction in the molten steel reaches 0.001 to 0.01%, an alloy or a cored wire containing two or more elements selected from Al, ca, mg, zr, ba, and RE is added. In the present invention, RE refers to rare earth elements, and in a specific embodiment, RE is a rare earth element, including Ce, la, and Y.
In a preferred embodiment, in the step (3), full-protection casting is adopted for continuous casting of the molten steel, and electromagnetic stirring and/or continuous casting billet dynamic reduction are adopted for the continuous casting process;
in a preferred embodiment, in step (3), the slab is subjected to slow stack cooling.
In a preferred embodiment, in step (4), the rolled stock is subjected to accelerated cooling between the roll stands and/or after the exit of the final rolling mill, the cooling means including water cooling and air mist cooling.
The present invention will be described in detail below by way of examples. In the following examples and comparative examples, the yield strength, impact toughness and corrosion resistance of the B-shaped steel are measured according to the standard YB/T5182-2006.
Example 1
This example is used to illustrate the 450MPa grade vanadium-titanium microalloyed weathering B-type steel and the production method thereof.
Smelting the desulfurized molten iron and the scrap steel material into molten steel; when the temperature of the molten steel reaches 1720 ℃, the components of the molten steel reach C:0.04%, P:0.008%, S: tapping when the content is 0.02 percent; adding silicomanganese and calcium oxide into a steel ladle in the tapping process; conveying the ladle to a refining station for refining; in the LF refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of adjusting the components, the mass fraction of V is adjusted to 0.01 percent, and then the content of Ti is adjusted to 0.07 percent, which satisfies the relation (1): [ V ]]+1.86[Ti]－5.88[Ti] 2 =0.11; finally, obtaining molten steel with qualified components; sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet; the continuous casting billet is heated again and then is sent into a B-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1250 ℃, and the final rolling temperature is 900 ℃; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel A1 with the grade of 450 MPa.
The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A1 comprises the following chemical components in percentage by mass: 0.1%, si:0.15 percentMn:1.7%, P:0.008%, S:0.005%, cu:0.4%, ni:0.3%, cr:0.4%, mo:0.004%, V:0.01%, ti:0.07%, al:0.05%, B:0.0006%, O:0.004%, N:0.001%, and the balance of Fe and inevitable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.11。
The yield strength of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A1 is 480MPa, and the impact toughness AK at minus 40 DEG C V The corrosion resistance is 230J, and the relative corrosion rate of the corrosion resistance is 25 percent compared with that of a Q345B standard sample.
Example 2
The embodiment is used for explaining the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and the production method thereof.
Smelting the desulfurized molten iron into molten steel; when the temperature of the molten steel reaches 1690 ℃, the components of the molten steel reach C in percentage by mass: 0.02%, P:0.01%, S:0.015%, mo:0.0001%, B: tapping when the content is 0.0001%; adding silicomanganese and calcium oxide into a steel ladle in the tapping process; conveying the ladle to a refining station for refining; in the refining process, power is supplied and the temperature is raised, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of refining molten steel, blowing argon from the bottom of a steel ladle; in the process of adjusting the components, the mass fraction of V is adjusted to 0.15 percent, and then the content of Ti is adjusted to 0.03 percent, which satisfies the relation (1): [ V ]]+1.86[Ti]－5.88[Ti] 2 =0.20; when the mass fraction of oxygen in the molten steel reaches 0.01%, adding an alloy cored wire containing Al and Ca, wherein the sum of the mass fractions of Ca, mg, zr, ba, ce, la and Y elements in the steel is 0.003%, wherein the Mg, zr, ba, ce, la and Y elements are residual elements in the molten steel; finally, obtaining molten steel with qualified components; sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting blank; directly feeding the continuous casting billets into a B-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1200 ℃, and the final rolling temperature is 850 ℃; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel A2 with the grade of 450 MPa.
The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A2 comprises the following chemical components in percentage by mass: 0.06%, si:0.36%, mn:1.36%, P:0.016%, S:0.008%, cu:0.2%, ni:0.4%, cr:0.1%, mo:0.0001%, V:0.15%, ti:0.03%, al:0.02%, B:0.0001%, O:0.007%, N:0.004%, and the balance of Fe and inevitable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.20。
The number of oxide particles having a size of 0.25 to 5 μm and containing Al and Ca elements in the steel is 1260/mm 2 (ii) a 55% by number of the above oxide particles further contain titanium oxide and titanium nitride, and the average volume of titanium oxide and titanium nitride in the whole particles accounts for 15%; the sum of the mass fractions of Ca, mg, zr, ba and RE elements in the steel is 0.003%.
The yield strength of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A2 is 465MPa, and the impact toughness AK is at-40 DEG C V The corrosion resistance is 240J, and the relative corrosion rate of the corrosion resistance is 34 percent compared with that of a Q345B standard sample.
Example 3
The embodiment is used for explaining the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel and the production method thereof.
Smelting the desulfurized molten iron into molten steel; when the temperature of the molten steel reaches 1750 ℃, the components of the molten steel reach C:0.02%, P:0.003%, S:0.005%, mo:0.01%, B: tapping when the content is 0.0005 percent; adding aluminum deoxidation and premelting slag into a ladle in the tapping process; conveying the ladle to a refining station for refining; in the refining process, power is supplied and temperature is raised, white slag is produced and desulfurized, nitrogen is blown from the bottom of a steel ladle, and deoxidation and alloying are carried out; in the process of adjusting the components, the mass fraction of V is adjusted to 0.12 percent, and then the content of Ti is adjusted to 0.01 percent, so that the formula (1) is satisfied: [ V ]]+1.86[Ti]－5.88[Ti] 2 =0.138; carrying out RH refining on the molten steel; when the mass fraction of oxygen in the molten steel reaches 0.001%, adding an alloy containing Mg and Zr; finally, obtaining molten steel with qualified components; sending the molten steel with qualified components to a rectangular continuous casting machine for full-protection casting, wherein electromagnetic stirring is adopted in the continuous casting process to obtain a continuous casting blank; stacking and slowly cooling the continuous casting billets, heating again, and then feeding the continuous casting billets into a Z-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1100 ℃, and the final rolling temperature is 750 ℃; carrying out water-cooling accelerated cooling on the rolled piece between the rolling mill frames; obtaining a hot-rolled B-shapedSection steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel A3 with the pressure of 450 MPa.
The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A3 comprises the following chemical components in percentage by mass: 0.13%, si:0.52%, mn:1.56%, P:0.003%, S:0.001%, cu:0.1%, ni:0.7%, cr:0.5%, mo:0.01%, V:0.12%, ti:0.01%, al:0.015%, B:0.0005%, O:0.001%, N:0.025%, and the balance of Fe and inevitable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.138。
The number of oxide particles having a size of 0.25 to 5 μm and containing Mg and Zr in the steel is 860/mm 2 (ii) a 74% by number of the particles of the above oxide further comprises titanium oxide and titanium nitride, the average volume of titanium oxide and titanium nitride in the whole particles being 16%; the sum of the mass fractions of Ca, mg, zr, ba and RE elements in the steel is 0.01%.
The yield strength of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A3 is 475MPa, and the impact toughness AK at-40 DEG C V The corrosion resistance is 180J, and the relative corrosion rate of the corrosion resistance is 12 percent compared with that of a Q345B standard sample.
Example 4
This example is used to illustrate the 450MPa grade vanadium-titanium microalloyed weathering B-type steel and the production method thereof.
Smelting the scrap steel into molten steel; when the temperature of the molten steel reaches 1690 ℃, the components of the molten steel reach C in percentage by mass: 0.04%, P:0.02%, S: tapping when the content is 0.025 percent; during tapping, adding silicon-calcium-barium and calcium oxide into a steel ladle; conveying the ladle to a refining station for refining; in the refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of adjusting the components, the mass fraction of V is adjusted to 0.08 percent, and then the content of Ti is adjusted to 0.12 percent, which satisfies the relation (1): [ V ]]+1.86[Ti]－5.88[Ti] 2 =0.218; carrying out VD refining on the molten steel; when the mass fraction of oxygen in the molten steel reaches 0.007%, adding Al, ca and Ba alloys; finally, obtaining molten steel with qualified components; sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet; direct casting of slabsFeeding the mixture into a B-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1100 ℃, and the final rolling temperature is 850 ℃; after the outlet of the final mill, the rolled piece is subjected to water cooling and accelerated cooling; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel A4 with the grade of 450 MPa.
The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A4 comprises the following chemical components in percentage by mass: 0.08%, si:0.75%, mn:1.0%, P:0.02%, S:0.012%, cu:0.7%, ni:0.1%, cr:1.0%, mo:0.008%, V:0.08%, ti:0.12%, al:0.008%, B:0.002%, O:0.003%, N:0.03%, the balance being Fe and unavoidable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.218。
The number of oxide particles having a size of 0.25 to 5 μm and containing Al, ca and Ba in the steel is 540/mm 2 (ii) a 76% by number of the particles of the above oxide further contains titanium oxide and titanium nitride, and the average volume of titanium oxide and titanium nitride in the whole particles is 15%; the sum of the mass fractions of Ca, mg, zr, ba and RE elements in the steel is 0.006%.
The yield strength of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A4 is 490MPa, and the impact toughness AK is at-40 DEG C V The corrosion resistance is 240J, and the relative corrosion rate of the corrosion resistance is 15 percent compared with that of a Q345B standard sample.
Example 5
This example is used to illustrate the 450MPa grade vanadium-titanium microalloyed weathering B-type steel and the production method thereof.
Smelting the desulfurized molten iron and the scrap steel material into molten steel; when the temperature of the molten steel reaches 1650 ℃, the components of the molten steel reach C:0.06%, P:0.012%, S: tapping when the content is 0.02 percent; adding strontium and fluorite into a steel ladle in the tapping process; conveying the ladle to a refining station for refining; in the refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of adjusting the components, the mass fraction of V is adjusted to 0.03 percent, and then the content of Ti is adjusted to 0.15 percent, which satisfies the relation (1): [ V ]]+1.86[Ti]－5.88[Ti] 2 =0.177; when the oxygen mass fraction in the molten steel reaches 0.01 percent, addingThe alloy cored wire containing Ca and Ce; finally, obtaining molten steel with qualified components; sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting blank; the continuous casting billet is heated again and then is sent into a B-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1180 ℃, and the final rolling temperature is 920 ℃; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel A5 with the pressure of 450 MPa.
The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A5 comprises the following chemical components in percentage by mass: 0.15%, si:0.6%, mn:1.25%, P:0.012%, S:0.015%, cu:0.5%, ni:0.2%, cr:0.8%, mo:0.02%, V:0.03%, ti:0.15%, al:0.001%, B:0.001%, O:0.01%, N:0.014%, the balance being Fe and unavoidable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.177。
The number of oxide particles of Ca and Ce in the steel is 630/mm, the size of the oxide particles is 0.25-5 mu m 2 (ii) a 70% by weight of the above oxide particles further contain titanium oxide and titanium nitride, and the average volume of titanium oxide and titanium nitride in the whole particles is 12%; the sum of the mass fractions of Ca, mg, zr, ba and RE elements in the steel is 0.004%.
The yield strength of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel A5 is 490MPa, and the impact toughness AK at minus 40 DEG C V The corrosion resistance is 210J, and the relative corrosion rate of the corrosion resistance is 21 percent compared with that of a Q345B standard sample.
Comparative example 1
This comparative example is for explaining a type B steel B1 containing vanadium and titanium and a production method thereof.
Smelting the desulfurized molten iron and the scrap steel material into molten steel; when the temperature of the molten steel reaches 1700 ℃, the components of the molten steel reach C:0.04%, P:0.01%, S: tapping when the content is 0.01 percent; adding silicomanganese and calcium oxide into a steel ladle in the tapping process; conveying the ladle to a refining station for refining; in the LF refining process, power is supplied and the temperature is raised, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of adjusting the components, simultaneously adjusting the content of all alloy elements according to the component requirements of the V-Ti-containing B1 steel; sending molten steel obtained by smelting to a rectangular continuous casting machine for continuous casting to obtain a continuous casting blank; the continuous casting slab is heated again and then sent to a Z-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1250 ℃, and the final rolling temperature is 900 ℃; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain V-titanium-containing B-shaped steel B1.
The B-shaped steel B1 comprises the following chemical components in percentage by mass: 0.12%, si:0.15%, mn:1.57%, P:0.01%, S:0.01%, cu:0.4%, ni:0.3%, cr:0.4%, mo:0.004%, V:0.03%, ti:0.03%, al:0.04%, B:0.001%, O:0.005%, N:0.005%, and the balance of Fe and inevitable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.08。
The yield strength of the B-shaped steel B1 is 420MPa, and the impact toughness AK at-40 DEG C V The corrosion resistance is 200J, and the relative corrosion rate of the corrosion resistance is 24 percent compared with that of a Q345B standard sample.
Comparative example 2
This comparative example is for explaining a type B steel B2 containing vanadium and titanium and a production method thereof.
Smelting the desulfurized molten iron and the scrap steel material into molten steel; when the temperature of the molten steel reaches 1720 ℃, the components of the molten steel reach C:0.05%, P:0.005%, S: tapping when the content is 0.006%; adding aluminum and premelting slag into a ladle in the tapping process; conveying the ladle to a refining station for refining; in the LF refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; in the process of adjusting the components, simultaneously adjusting the content of all alloy elements according to the component requirements of the V-Ti-containing B2-shaped steel; sending molten steel obtained by smelting to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet; the continuous casting billet is heated again and then is sent into a B-shaped steel rolling unit for rolling; the initial rolling temperature of the casting blank is 1260 ℃, and the final rolling temperature is 850 ℃; obtaining hot-rolled B-shaped steel; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain V-Ti-containing B-shaped steel B2.
The B-shaped steel B2 comprises the following chemical components in percentage by mass: 0.09%, si:0.70%, mn:1.2%, P:0.005%, S:0.006%, cu:0.5%, ni:0.3%, cr:1.0%, mo:0.01%, V:0.12%, ti:0.12 percentAl:0.01%, B:0.001%, O:0.003%, N:0.003%, the balance being Fe and inevitable impurities; [ V ]]+1.86[Ti]－5.88[Ti] 2 ＝0.26。
The yield strength of the B-shaped steel B2 is 500MPa, and the impact toughness AK is at-40 DEG C V The corrosion resistance is 22J, and the relative corrosion rate of the corrosion resistance is 65 percent compared with that of a Q345B standard sample.
The performance data of the B-shaped steels prepared in examples 1-5 and comparative examples 1-2 above are shown in Table 1 below.
TABLE 1
As can be seen from the data in Table 1, the B-shaped steels of examples 1 to 5 of the present invention have good yield strength, impact toughness and corrosion resistance, all meeting the standard requirements. The element content of the B-shaped steel of the comparative example 1 is lower than the lower limit of the relational expression (1), the yield strength of the product is lower than 450MPa, and the standard requirement is not met. The element content of the B-shaped steel of the comparative example 2 is higher than the upper limit of the relation (1), the yield strength reaches more than 450MPa, but the impact toughness and the corrosion resistance are obviously reduced, and the product does not meet the standard requirement.
According to the embodiment and the comparative example, the reasonable matching relationship of the alloy elements is limited, so that the strengthening effect of the alloy elements is effectively improved, the alloy cost is obviously reduced, and the comprehensive performance of the material is stably improved.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including various technical features being combined in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (8)
1. The 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel is characterized by comprising the following chemical components in percentage by mass based on the total mass of the 450 MPa-grade vanadium-titanium microalloyed weather-resistant B-shaped steel: c:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo: 0.0001-0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B: 0.0001-0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, and the balance of Fe and inevitable impurities;
wherein, the contents of V and Ti satisfy the following relational expression:
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element, unit is%;
in the B-shaped steel, the number of oxide particles having a size of 0.25 to 5 μm and containing two or more elements of Al, ca, mg, zr, ba and RE is 200 to 2000/mm 2 (ii) a 10 to 90 percent of the oxide particles further comprise titanium oxide and/or titanium nitride in terms of the number of the particles, and the average volume ratio of the titanium oxide and/or the titanium nitride in the whole particles is less than 50 percent; the sum of the mass fractions of Ca, mg, zr, ba and RE elements in the B-shaped steel is 0.001-0.01%.
2. The method for producing the 450MPa grade vanadium-titanium microalloyed weather-resistant B-shaped steel as claimed in claim 1, wherein the method comprises the following steps:
(1) Making steel
Smelting the desulfurized molten iron and/or the waste steel material into molten steel; when the temperature of the molten steel reaches 1600-1750 ℃, the components of the molten steel reach C:0.02 to 0.08%, P:0.003 to 0.02%, S: tapping when the content is 0.001-0.025 percent;
in the tapping process, adding deoxidized alloy and a slag former into a ladle;
(2) Refining
Conveying the ladle to a refining station for refining; in the refining process, power is supplied to raise the temperature, white slag is produced for desulfurization, and deoxidation and alloying are carried out; according to the component requirements of 450 MPa-grade vanadium-titanium microalloying weather-resistant B-shaped steel, the components of molten steel are adjusted to reach C:0.06 to 0.15%, si:0.15 to 0.75%, mn:1 to 1.7%, P:0.003 to 0.02%, S:0.001 to 0.015%, cu:0.1 to 0.7%, ni:0.1 to 0.7%, cr:0.1 to 1%, mo: 0.0001-0.02%, V:0.01 to 0.15%, ti:0.01 to 0.15%, al:0.001 to 0.05%, B:0.0001 to 0.002%, O:0.001 to 0.01%, N:0.001 to 0.03 percent, in the process of adjusting the components, firstly adjusting the mass fraction of V to 0.01 to 0.15 percent, then adjusting the content of Ti according to the following formula (1) to obtain molten steel with qualified components,
0.10＜[V]+1.86[Ti]－5.88[Ti] 2 < 0.22 formula (1)
Wherein [ ] represents the mass fraction of the corresponding element, unit is%;
when the oxygen mass fraction in the molten steel reaches 0.001-0.01%, adding alloy or cored wire containing two or more elements of Al, ca, mg, zr, ba and RE;
(3) Continuous casting
Sending the molten steel with qualified components to a rectangular continuous casting machine for continuous casting to obtain a continuous casting billet;
(4) Rolling of
Directly feeding the continuous casting billet into a B-shaped steel rolling unit for rolling, or feeding the continuous casting billet into the B-shaped steel rolling unit for rolling after reheating; the initial rolling temperature of the casting blank is 1100-1280 ℃, and the final rolling temperature is 750-950 ℃, so that the hot rolled B-shaped steel is obtained; and cooling the hot-rolled B-shaped steel on a cooling bed to obtain the vanadium-titanium microalloyed weather-resistant B-shaped steel with the grade of 450 MPa.
3. The production method according to claim 2, wherein in the step (1), the mass fractions of Mo and B in the molten steel during tapping satisfy Mo: 0.0001-0.02%, B:0.0001 to 0.002 percent.
4. The production method according to claim 2, wherein in the step (2), argon or nitrogen is bottom-blown to the ladle during the refining of the molten steel.
5. The production method according to claim 2, wherein the molten steel in the step (2) is further subjected to RH or VD refining.
6. The production method according to claim 2, wherein in the step (3), the continuous casting of the molten steel adopts full-protection casting, and the continuous casting process adopts electromagnetic stirring and/or continuous casting billet dynamic reduction.
7. The production method according to claim 2, wherein the slab is subjected to stack slow cooling in the step (3).
8. The production method as set forth in claim 2 wherein in step (4) the product is subjected to accelerated cooling between the mill stands and/or after the exit of the final mill by cooling means including water cooling and mist cooling.
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