CN110952030A - Multi-element nitralloy and application thereof in preparation of hot-rolled ribbed steel bars - Google Patents
Multi-element nitralloy and application thereof in preparation of hot-rolled ribbed steel bars Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C35/00—Master alloys for iron or steel
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- C—CHEMISTRY; METALLURGY
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention provides a multi-element nitride alloy and application thereof in preparing hot-rolled ribbed steel bars. The multi-element nitride alloy comprises the following components in percentage by mass: si: 20-37%, N: 10-22%, Ti: 8-21%, Cr: 4-9%, B: 0.5-3%, V is less than or equal to 1%, Nb is less than or equal to 1%, S is less than or equal to 0.15%, P is less than or equal to 0.15%, and the balance is iron and inevitable impurities. The multi-element nitrided alloy does not contain expensive alloy elements such as niobium and vanadium, and can greatly reduce the consumption of the strengthening elements when being matched with other strengthening elements such as ferrovanadium nitride and the like for use, improve the effective utilization rate of the strengthening elements and further obtain good strengthening effect; the multi-element nitralloy is utilized to strengthen the toughness, the plasticity, the ageing resistance and the mechanical property of the hot-rolled ribbed steel bar, and simultaneously, the production cost of ton steel is effectively reduced.
Description
Technical Field
The invention relates to the technical field of hot-rolled ribbed steel bar preparation, in particular to a multi-element nitriding alloy and application thereof in preparation of hot-rolled ribbed steel bars.
Background
At present, in order to improve the strength of hot-rolled ribbed steel bars, alloy elements such as niobium, vanadium and the like are generally adopted for strengthening, and the addition amount of ferrovanadium in each ton of molten steel during strengthening is as high as about 1 kg. On one hand, alloy elements such as vanadium, niobium and the like are limited by resources and have higher price, and the large amount of addition is not beneficial to reducing the cost of steel per ton; on the other hand, the solid solution amount of vanadium in steel is large, and the precipitation amount is small, so that the effective utilization rate of vanadium is low, and the strengthening effect of vanadium cannot be effectively exerted.
In order to solve the above problems, the prior art proposes to use a nitrogen-coated core wire for reinforcement. According to the method, after tapping of a converter, a steel ladle is opened to an argon blowing station to start wire feeding, soft argon blowing is adopted in the wire feeding process to increase nitrogen in molten steel, and the control difficulty of the whole process is large due to the influence of adverse factors such as wire feeding speed, argon blowing, large single weight fluctuation of core powder per meter, unstable adding amount and the like, so that the actual operation and accurate control of molten steel components are inconvenient, and the yield of the nitrogen-coated core wire is unstable; in addition, the increase of nitrides in molten steel deteriorates plasticity and toughness of steel, thereby affecting the performance of steel.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention provides a multi-element nitrided alloy and application thereof in preparing hot-rolled ribbed steel bars, wherein the multi-element nitrided alloy does not add expensive alloy elements such as niobium, vanadium and the like, and can greatly reduce the dosage of strengthening elements when being matched with strengthening elements such as ferrovanadium nitride and the like for use, improve the effective utilization rate of the strengthening elements and further obtain good strengthening effect; the multi-element nitralloy is utilized to strengthen the toughness, the plasticity, the ageing resistance and the mechanical property of the hot-rolled ribbed steel bar, and simultaneously, the production cost of ton steel is effectively reduced.
The invention provides a multi-element nitride alloy, which comprises the following components in percentage by mass: si: 20-37%, N: 10-22%, Ti: 8-21%, Cr: 4-9%, B: 0.5-3%, V is less than or equal to 1%, Nb is less than or equal to 1%, S is less than or equal to 0.15%, P is less than or equal to 0.15%, and the balance is iron and inevitable impurities.
The multielement nitriding alloy is applied to the steelmaking process in the ferrous metallurgy industry, and the multielement nitriding alloy is added in molten steel through manual intervention to carry out microalloying on the molten steel. In the multi-element nitrided alloy, except niobium, vanadium and other elements which are inevitably introduced in a small amount due to addition of other elements, expensive alloy elements such as niobium and vanadium are not additionally added, and when the multi-element nitrided alloy is matched with strengthening elements such as vanadium-nitrogen alloy, the consumption can be reduced, the strengthening effect is enhanced, the effective utilization rate (namely the yield) of the strengthening elements is improved, the production cost of steel per ton is obviously reduced, and the toughness, the ageing resistance and the mechanical property of the steel are excellent.
In the multi-element nitride alloy of the present invention, V, Nb, S, and P are inevitably introduced when other elements are added, and the contents thereof are not strictly limited, and the contents of the respective elements are substantially lower than the above-described content limit values.
In the present invention, unless otherwise specified, the contents all refer to mass%.
Further, the multi-element nitride alloy of the present invention includes, in mass content: si: 20-30%, N: 15-20%, Ti: 10-20%, Cr: 5-9%, B: 1-3 percent of the total weight of the alloy, less than or equal to 1 percent of V, less than or equal to 1 percent of Nb, less than or equal to 0.15 percent of S, less than or equal to 0.15 percent of P, and the balance of iron and inevitable impurities.
More preferably, the multi-element nitride alloy includes, by mass: si: 22-26%, N: 15-19%, Ti: 13-16%, Cr: 7-8%, B: 1.5-2%, V: 0.5-0.6%, Nb: 0.3 to 0.5 percent of iron, less than or equal to 0.15 percent of S, less than or equal to 0.15 percent of P, and the balance of iron and inevitable impurities.
The multi-element nitralloy with the composition has the effects of stable and efficient nitrogen alloy micro-alloying and the like, can improve the interaction efficiency between N and elements such as V, B, Ti, Cr and the like, enables nitride and carbide of micro-alloying elements to be more stable, enables the ratio of the volume fraction of particles to the size of the particles to be maximum, and further enables the effects of grain refinement and precipitation strengthening of the micro-alloying steel to be maximized. The multi-element nitralloy can solve the problems that the prior nitralloy has low effective utilization rate in the microalloying of molten steel and the like, and effectively promotes the V element to form VN and VC, thereby forming nitrogen carbide VCxN1-xCan form composite microalloy nitrogen carbide with trace elements in molten steel so as to generate strong precipitation strengthening effect on the steel.
The preparation method of the multi-element nitride alloy is not strictly limited, and the multi-element nitride alloy can be prepared by selecting appropriate raw materials according to the composition and performing conventional processing and forming modes such as pressing and the like; wherein, the selected raw materials include but are not limited to titanium nitride, boron nitride, chromium nitride and the like.
The shape, size, etc. of the above-mentioned multi-element nitride alloy are not particularly limited in the present invention, and the shape of the multi-element nitride alloy may be, for example, granular, massive, etc., and the grain size of the multi-element nitride alloy may be, for example, 5 to 40 mm.
The invention prepares the multi-element nitralloy into grains or blocks for use, and can solve the problems that the production is influenced by the broken wire in the wire feeding process in the existing composite nitrogen cored wire process, and the difficult problems of inconvenient operation, accurate control and the like caused by uneven core powder components, large single weight fluctuation of the core powder per meter, unstable adding amount and the like are solved. The multi-element nitriding alloy has more uniform and stable components, is beneficial to the accurate control of the components of molten steel, and further ensures the quality stability of steel; in addition, the multi-element nitralloy can be added along with other alloy elements in the later period of deoxidation alloying, so that the method is convenient to operate practically, can ensure the continuous operation of the whole process, and is beneficial to improving the production efficiency.
The invention also provides the application of the multi-element nitride alloy in preparing hot-rolled ribbed steel bars. It can be understood that the above-mentioned multielement nitrided alloy is used for strengthening molten steel to improve the mechanical properties of hot-rolled ribbed steel bars; the specific reinforcing method of the hot rolled ribbed steel bar and the specific use method of the multi-element nitrided alloy are not particularly limited, and conventional reinforcing methods in the art may be employed.
Preferably, the multi-element nitrided alloy and the vanadium-nitrogen alloy are adopted for strengthening when the hot-rolled ribbed steel bar is prepared, namely the multi-element nitrided alloy and the vanadium-nitrogen alloy are matched for use; wherein the dosage of the multi-element nitriding alloy is 0.3-0.8 kg/ton of molten steel, more preferably 0.3-0.6 kg/ton of molten steel, even more preferably 0.3-0.4 kg/ton of molten steel, and the dosage of the vanadium-nitrogen alloy is 0.3-0.4 kg/ton of molten steel. By replacing part of vanadium-nitrogen alloy with multi-element nitriding alloy, the dosage of the vanadium-nitrogen alloy is obviously reduced while the strengthening effect is ensured or even improved, and the production cost of per ton of steel is greatly reduced.
In another aspect, the present invention provides a method for manufacturing a hot-rolled ribbed steel bar, comprising: adding alloy into the molten steel in the tapping process under the condition of introducing inert gas; wherein the alloy comprises the above multi-element nitride alloy. Preferably, the amount of the multi-element nitriding alloy is 0.3-0.8kg, more preferably 0.3-0.6kg, and even more preferably 0.3-0.4kg per ton of molten steel.
The key point of the preparation method is that the multielement nitriding alloy with the specific composition is added into the molten steel for strengthening or alloying in the tapping process and under the condition of introducing inert gas, and other processes can basically adopt the conventional technology in the field. Specifically, the overall production process flow of the invention is as follows: smelting in a converter or an electric furnace → alloying of tapping → argon blowing station → refining (optional) in an LF furnace → continuous casting and casting → cutting of casting blank → rolling; wherein, the smelting can be converter smelting or electric furnace smelting, and whether the production process of the LF refining furnace is carried out can be determined according to actual needs. The tapping process is specifically a converter or electric furnace post-tapping process.
Further, the alloy of the present invention also includes a deoxidized alloy containing a silicon element and a manganese element; the addition of the deoxidation alloying alloy containing silicon element and manganese element is used for improving the content of silicon and manganese in the molten steel so as to meet the design requirement of molten steel components. The types and the dosage of the added deoxidation alloying alloy are not strictly limited, and the requirements on the content of related elements in the molten steel can be met; the deoxidation alloying alloy can be selected from at least one of silicon-iron alloy, ferromanganese alloy and silicon-manganese alloy, for example, the silicon-manganese alloy is selected alone, or the silicon-iron alloy and the ferromanganese alloy are selected simultaneously, and the dosage of the deoxidation alloying alloy can be determined according to the design and the practical application requirements of the steel.
In the present invention, the amount of the deoxidized alloying alloy may be such that the silicon content of the molten steel is 0.35 to 0.70%, more preferably 0.35 to 0.50%, and the manganese content is 1.30 to 1.50%; more specifically, the amount of the deoxidized alloying alloy may be about 21 to 23.5kg per ton of molten steel. Further, the timing of addition of the deoxidation alloy is not particularly limited, and the deoxidation alloy may be added to the molten steel simultaneously with the above-mentioned multi-element nitrided alloy, or may be added after the addition of the above-mentioned multi-element nitrided alloy.
Further, the alloy of the present invention also includes vanadium-nitrogen alloy; specifically, the vanadium-nitrogen alloy can be nitrided ferrovanadium, and the vanadium content of the vanadium-nitrogen alloy is 50-57%, and the nitrogen content is 9-14%. In the invention, the dosage of the vanadium-nitrogen alloy is obviously lower than that of the prior art (about 1 kg), and the dosage of the vanadium-nitrogen alloy is specifically that 0.3-0.4kg of vanadium-nitrogen alloy is added into each ton of molten steel; that is to say, the multi-element nitrided alloy which is not added with niobium and vanadium basically replaces part of vanadium-nitrogen alloy, so that the strengthening effect is ensured, and the consumption of the vanadium-nitrogen alloy is greatly reduced, thereby the production cost of steel per ton is obviously reduced.
The adding time of the vanadium-nitrogen alloy is not strictly limited, and the vanadium-nitrogen alloy and the multi-element nitrided alloy can be added into molten steel at the same time or can be added before the multi-element nitrided alloy is added.
It has been found that it is disadvantageous to prepare the multielement nitrided alloy together with other alloys for simultaneous addition to the molten steel, because: the main strengthening element in the deformed steel bar is one or a plurality of compounds of V, Nb and Ti, if the nitrided ferrovanadium is added into the multi-element nitrided alloy, the stable control of the components in the deformed steel bar is not facilitated, and the target component control of different designs cannot be met. The method is beneficial to accurately controlling the vanadium and nitrogen components by respectively adding the multi-element nitriding alloy and the vanadium-nitrogen alloy into the molten steel, and provides convenience for application of other designs using one or more of V, Nb and Ti.
Particularly, in the invention, the flow rate of the inert gas is 600-800NL/min, which is obviously higher than that of the conventional inert gas (below 100 NL/min). That is, the present invention is to add the above alloy under strong stirring with inert gas.
The research finds that: the method adds the multi-element nitriding alloy in the processes of steel tapping after the furnace and argon high-flux strong blowing stirringThe microalloying mode can effectively promote vanadium element and nitrogen and carbon in steel to form VC and VN which have the same crystal structure and similar lattice constants, so that nitrogen carbide VCxN1-x can be formed by infinite mutual dissolution, a composite microalloy nitrogen carbide precipitation item can be formed when Ti, Cr, B, V and other elements exist in the steel to generate strong precipitation strengthening effect on the steel, and the element B has strong structure gamma- α phase change effect and only needs 10-6The order of magnitude of solid solution can remarkably delay the phase transformation of ferrite and pearlite, meanwhile, B can effectively prevent the brittleness sensitivity caused by the segregation of P in grain boundary, TiN formed by Ti element and N element can prevent the coarsening of crystal grains when austenite is heated to a certain degree, meanwhile, the anti-aging property of steel is improved, Cr can delay the transformation of pearlite, and pearlite is refined, thereby playing a strengthening role in the steel rolling process.
In the present invention, the kind of the inert gas is not particularly limited, and may be, for example, argon or nitrogen. Further, the timing of adding the alloy throughout the entire tapping process is not strictly limited, and for example, the alloy may be added to the molten steel at the time of the tapping amount of 1/4 to 1/3, and the entire alloy may be added at the time of the tapping amount of 2/3 to 3/4.
The invention also provides a hot-rolled ribbed steel bar which is prepared according to the preparation method; preferably, the yield strength of the hot-rolled ribbed steel bar is 425-510MPa, and the compressive strength is 580-670 MPa.
Compared with the prior art, the invention has the beneficial effects that at least:
1. the multi-element nitriding alloy disclosed by the invention is not added with alloy elements with expensive niobium, vanadium and the like, can reduce the consumption and enhance the strengthening effect when being matched with strengthening elements such as vanadium-nitrogen alloy and the like, and obviously reduces the production cost of steel per ton while improving the toughness and plasticity, the ageing resistance and the mechanical property of steel;
2. the invention adopts the multielement nitriding alloy for reinforcement, has uniform and stable components, is convenient to operate in an adding mode, is beneficial to the accurate control of the components of molten steel and the stability of the steel quality, and can ensure the continuity of the whole process;
3. the yield of the alloy elements is high, for example, the vanadium element reaches more than 94 percent; meanwhile, the prepared hot-rolled ribbed steel bar has good mechanical properties, wherein the yield strength reaches 425-510MPa, and the compressive strength reaches 580-670 MPa.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparation of multi-element nitride alloy
The multi-element nitride alloy of the embodiment comprises the following components in percentage by mass: si: 26%, N: 19%, Ti: 16%, Cr: 7%, B: 1.5%, V: 0.5%, Nb: 0.4 percent of S is less than or equal to 0.10 percent, P is less than or equal to 0.10 percent, and the balance is iron and inevitable impurities.
According to the requirements of the components, raw materials such as titanium nitride, boron nitride, chromium nitride and the like are mixed and pressed into alloy blocks with the granularity of 5-40mm, and the multielement nitride alloy is prepared.
Secondly, preparing hot-rolled ribbed steel bars
When the steel output after the converter reached 1/4, argon gas was continuously introduced into the molten steel at a rate of 700NL/min to strongly stir the molten steel, and a silicomanganese alloy and a ferrosilicon alloy were added to the molten steel so that the silicon content in the molten steel was controlled to 0.43% and the manganese content was controlled to 1.38%, and then the above-mentioned multi-element nitrided alloy was added to the molten steel at a rate of 0.3 kg/ton of molten steel, and vanadium iron nitride (vanadium content 53%, nitrogen content 11%) was added to the molten steel at a rate of 0.4 kg/ton of molten steel.
When the ferrovanadium nitride is added, the steel tapping amount is about 3/4; the aeration rate of argon was adjusted to 100m3And continuously tapping below the/h, sending the molten steel to an argon blowing station after tapping is finished, and then carrying out continuous casting, casting blank cutting and rolling to prepare the hot-rolled ribbed steel bar.
Detecting the yield strength and compressive strength of hot-rolled ribbed steel bars with the diameter of 14mm according to a steel test method for GB/T28900 reinforced concrete; the vanadium yield was calculated from the amount of ferrovanadium nitride added, the vanadium content in ferrovanadium nitride, the residual vanadium content in the final molten steel, the tap steel amount, and the vanadium content in the molten steel, and the results are shown in table 1.
Example 2
Preparation of multi-element nitride alloy
The multi-element nitride alloy of the embodiment comprises the following components in percentage by mass: si: 25.5%, N: 18%, Ti: 16%, Cr: 8%, B: 1.8%, V: 0.6%, Nb: 0.5 percent of S is less than or equal to 0.10 percent, P is less than or equal to 0.10 percent, and the balance is iron and inevitable impurities.
According to the requirements of the components, raw materials such as titanium nitride, boron nitride, chromium nitride and the like are mixed and pressed into alloy blocks with the granularity of 5-40mm, and the multielement nitrided alloy is prepared.
Secondly, preparing hot-rolled ribbed steel bars
When the steel output after the converter reached 1/3, argon gas was continuously introduced into the molten steel at a rate of 800NL/min for vigorous stirring, and a silicomanganese alloy and a ferrosilicon alloy were added to the molten steel so that the silicon content in the molten steel became 0.39% and the manganese content became 1.39%, and then the above-mentioned multi-element nitrided alloy was added to the molten steel at an amount of 0.5 kg/ton of molten steel, and ferrovanadium nitride (vanadium content: 53% and nitrogen content: 11%) was added to the molten steel at an amount of 0.3 kg/ton of molten steel.
When the ferrovanadium nitride is added, the steel tapping amount is about 3/4; the aeration rate of argon was adjusted to 100m3And continuously tapping below the/h, sending the molten steel to an argon blowing station after tapping is finished, and then carrying out continuous casting, casting blank cutting and rolling to prepare the hot-rolled ribbed steel bar.
Detecting the yield strength and compressive strength of the hot-rolled ribbed steel bar with the diameter of 16mm according to a steel test method for GB/T28900 reinforced concrete; the vanadium yield was calculated from the amount of ferrovanadium nitride added, the vanadium content in ferrovanadium nitride, the residual vanadium content in the final molten steel, the tap steel amount, and the vanadium content in the molten steel, and the results are shown in table 1.
Example 3
Preparation of multi-element nitride alloy
The multi-element nitride alloy of the embodiment comprises the following components in percentage by mass: si: 22%, N: 15%, Ti: 13%, Cr: 8%, B: 2.0%, V: 0.5%, Nb: 0.3 percent of S is less than or equal to 0.15 percent, P is less than or equal to 0.10 percent, and the balance is iron and inevitable impurities.
According to the requirements of the components, raw materials such as titanium nitride, boron nitride, chromium nitride and the like are mixed and pressed into alloy blocks with the granularity of 5-40mm, and the multielement nitrided alloy is prepared.
Secondly, preparing hot-rolled ribbed steel bars
When the steel output after the converter reached 1/4, argon gas was continuously introduced into the molten steel at a rate of 600NL/min for vigorous stirring, and a silicomanganese alloy and a ferrosilicon alloy were added to the molten steel so that the silicon content in the molten steel became 0.43% and the manganese content became 1.46%, and then the above-mentioned multi-element nitrided alloy was added to the molten steel at an amount of 0.8 kg/ton of molten steel, and ferrovanadium nitride (vanadium content: 53% and nitrogen content: 11%) was added to the molten steel at an amount of 0.4 kg/ton of molten steel.
When the ferrovanadium nitride is added, the steel tapping amount is about 3/4; the aeration rate of argon was adjusted to 100m3And continuously tapping below the/h, sending the molten steel to an argon blowing station after tapping is finished, and then carrying out continuous casting, casting blank cutting and rolling to prepare the hot-rolled ribbed steel bar.
Detecting the yield strength and compressive strength of the hot-rolled ribbed steel bar with the diameter of 16mm according to a steel test method for GB/T28900 reinforced concrete; the vanadium yield was calculated from the amount of ferrovanadium nitride added, the vanadium content in ferrovanadium nitride, the residual vanadium content in the final molten steel, the tap steel amount, and the vanadium content in the molten steel, and the results are shown in table 1.
Example 4
Preparation of multi-element nitride alloy
The multi-element nitride alloy of the embodiment comprises the following components in percentage by mass: si: 24%, N: 16%, Ti: 15%, Cr: 7%, B: 1.5%, V: 0.6%, Nb: 0.4 percent of S is less than or equal to 0.10 percent, P is less than or equal to 0.10 percent, and the balance is iron and inevitable impurities.
According to the requirements of the components, raw materials such as titanium nitride, boron nitride, chromium nitride and the like are mixed and pressed into alloy blocks with the granularity of 5-40mm, and the multielement nitride alloy is prepared.
Secondly, preparing hot-rolled ribbed steel bars
When the steel output reaches 1/4 after the converter, argon gas is continuously introduced into the molten steel for strong stirring at a ventilation rate of 700NL/min, silicomanganese and ferrosilicon are added into the molten steel to control the silicon content in the molten steel to be 0.7% and the manganese content to be 1.5%, then the multi-element nitrided alloy is added into the molten steel at an addition rate of 0.3 kg/ton of molten steel, and vanadium iron nitride (the vanadium content is 53% and the nitrogen content is 11%) is added into the molten steel at an addition rate of 0.4 kg/ton of molten steel.
When the ferrovanadium nitride is added, the steel tapping amount is about 3/4; the aeration rate of argon was adjusted to 100m3And continuously tapping below the/h, sending the molten steel to an argon blowing station after tapping is finished, and then carrying out continuous casting, casting blank cutting and rolling to prepare the hot-rolled ribbed steel bar.
Detecting the yield strength and compressive strength of hot-rolled ribbed steel bars with the diameter of 14mm according to a steel test method for GB/T28900 reinforced concrete; the vanadium yield was calculated from the amount of ferrovanadium nitride added, the vanadium content in ferrovanadium nitride, the residual vanadium content in the final molten steel, the tap steel amount, and the vanadium content in the molten steel, and the results are shown in table 1.
Comparative example 1
Basically, the procedure of example 1 was repeated, except that the molten steel was stirred while continuously introducing argon gas at a rate of about 100NL/min when the tapping rate after the converter reached 1/4.
The results of quality testing of hot rolled ribbed bars made in this comparative example are shown in table 1.
Comparative example 2
Firstly, preparing the composite nitrogen alloy core-spun yarn
The complex nitrogen alloy cored wire of the comparative example comprises the following components in percentage by mass: n: 26%, Si: 35%, Al: 5%, Mn: 5 percent of S is less than or equal to 0.15 percent, P is less than or equal to 0.15 percent, and the balance is iron and inevitable impurities.
The specification requirement is as follows: phi 12 +/-0.5 mm, core powder mass more than or equal to 160g/m, and net weight of each roll is 1000 +/-50 kg.
According to the components and the specification requirements, the nitrogen-compounded alloy cored wire is prepared.
Secondly, preparing hot-rolled ribbed steel bars
When the steel output reaches 1/4 after the converter, argon gas is continuously introduced into the molten steel at a ventilation rate of 100NL/min for stirring, firstly, silicomanganese and ferrosilicon are added into the molten steel to ensure that the silicon content in the molten steel is 0.43 percent and the manganese content is 1.46 percent, and then ferrovanadium nitride (the vanadium content is 53 percent and the nitrogen content is 11 percent) is added into the molten steel at the addition rate of 0.4 kg/ton of molten steel.
And when the addition of the ferrovanadium nitride is finished, the steel tapping amount is about 3/4, the steel tapping is continued, the molten steel is conveyed to an argon blowing station after the steel tapping is finished, a wire feeding machine is used in the argon blowing station to feed the nitrogen-coated alloy cored wire into the molten steel according to 0.8kg/t, the molten steel is discharged from the argon blowing station after being stirred for 1 minute by argon, and then the molten steel is subjected to continuous casting, casting blank cutting and rolling to prepare the hot-rolled ribbed steel bar.
Detecting the yield strength and compressive strength of the hot-rolled ribbed steel bar with the diameter of 16mm according to a steel test method for GB/T28900 reinforced concrete; the vanadium yield was calculated from the amount of ferrovanadium nitride added, the vanadium content in ferrovanadium nitride, the residual vanadium content in the final molten steel, the tap steel amount, and the vanadium content in the molten steel, and the results are shown in table 1.
TABLE 1 quality test results of hot-rolled ribbed bars and vanadium yield
As can be seen from Table 1:
compared with the comparative example, the invention adopts argon with large flux to carry out strong blowing and stirring, and simultaneously adopts multi-element nitrided alloy and nitrided ferrovanadium to carry out reinforcement, thereby obviously improving the yield of vanadium element and the mechanical property of hot-rolled ribbed steel bars.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A multi-element nitride alloy comprising, by mass: si: 20-37%, N: 10-22%, Ti: 8-21%, Cr: 4-9%, B: 0.5-3%, V is less than or equal to 1%, Nb is less than or equal to 1%, S is less than or equal to 0.15%, P is less than or equal to 0.15%, and the balance is iron and inevitable impurities.
2. The multi-element nitride alloy of claim 1, comprising, in mass percent: si: 20-30%, N: 15-20%, Ti: 10-20%, Cr: 5-9%, B: 1-3%, V is less than or equal to 1%, Nb is less than or equal to 1%, S is less than or equal to 0.15%, P is less than or equal to 0.15%, and the balance of iron and inevitable impurities;
preferably, the multi-element nitride alloy includes, by mass: si: 22-26%, N: 15-19%, Ti: 13-16%, Cr: 7-8%, B: 1.5-2%, V: 0.5-0.6%, Nb: 0.3 to 0.5 percent of iron, less than or equal to 0.15 percent of S, less than or equal to 0.15 percent of P, and the balance of iron and inevitable impurities.
3. The multi-element nitride alloy according to claim 1 or 2, characterized in that the grain size of the multi-element nitride alloy is 5-40 mm.
4. Use of the multi-element nitride alloy of any of claims 1-3 in the manufacture of hot rolled ribbed steel bar;
preferably, the multi-element nitrided alloy and vanadium-nitrogen alloy are used for reinforcement in the preparation of hot rolled ribbed steel bars.
5. A method for preparing hot-rolled ribbed steel bars is characterized by comprising the following steps: adding alloy into the molten steel in the tapping process under the condition of introducing inert gas; wherein the alloy comprises the multi-element nitride alloy of any of claims 1-3;
preferably, the dosage of the multi-element nitriding alloy is 0.3-0.8kg of multi-element nitriding alloy, more preferably 0.3-0.6kg, and even more preferably 0.3-0.4 kg;
preferably, the tapping process is a converter or electric furnace post-tapping process.
6. The method of claim 5, wherein the alloy further comprises a deoxidized alloy containing a silicon element and a manganese element;
preferably, the deoxidized alloying alloy is selected from at least one of a silicon-iron alloy, a ferromanganese alloy and a silicon-manganese alloy;
preferably, the amount of the deoxidized alloying alloy is controlled so that the silicon content of the molten steel is 0.35 to 0.70%, more preferably 0.35 to 0.50%, and the manganese content is 1.30 to 1.50%;
preferably, the deoxidized alloying alloy is added prior to the addition of the multi-element nitrided alloy.
7. The method of manufacturing according to claim 5, wherein the alloy further comprises a vanadium-nitrogen alloy;
preferably, the vanadium-nitrogen alloy is nitrided ferrovanadium, the vanadium content of the vanadium-nitrogen alloy is 50-57%, and the nitrogen content is 9-14%;
preferably, the dosage of the vanadium-nitrogen alloy is 0.3-0.4kg of vanadium-nitrogen alloy added into each ton of molten steel;
preferably, the multi-element nitrided alloy is added at the same time or after the addition of the vanadium-nitrogen alloy.
8. The method according to any one of claims 5 to 7, wherein the inert gas is introduced at a flow rate of 600-800 NL/min;
preferably, the inert gas is argon.
9. The manufacturing method of any one of claims 5 to 7, wherein the alloy is initially charged into the molten steel at a tap amount of 1/4 to 1/3, and the entire alloy is completely charged at a tap amount of 2/3 to 3/4.
10. A hot-rolled ribbed steel bar produced by the production method according to any one of claims 5 to 9;
preferably, the yield strength of the hot-rolled ribbed steel bar is 425-510MPa, and the compressive strength is 580-670 MPa.
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