CN117701982B - Preparation process method of manganese-vanadium microalloy high-strength steel - Google Patents
Preparation process method of manganese-vanadium microalloy high-strength steel Download PDFInfo
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- CN117701982B CN117701982B CN202311509157.2A CN202311509157A CN117701982B CN 117701982 B CN117701982 B CN 117701982B CN 202311509157 A CN202311509157 A CN 202311509157A CN 117701982 B CN117701982 B CN 117701982B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 59
- ARZRWOQKELGYTN-UHFFFAOYSA-N [V].[Mn] Chemical compound [V].[Mn] ARZRWOQKELGYTN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 84
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 67
- 230000008569 process Effects 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000010791 quenching Methods 0.000 claims abstract description 26
- 230000000171 quenching effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 20
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 20
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 13
- 239000011572 manganese Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 239000011651 chromium Substances 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 239000011733 molybdenum Substances 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims description 29
- 238000003723 Smelting Methods 0.000 claims description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- 239000010955 niobium Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- 238000005468 ion implantation Methods 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000011573 trace mineral Substances 0.000 claims description 5
- 235000013619 trace mineral Nutrition 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000009827 uniform distribution Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 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 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241001449342 Chlorocrambe hastata Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C22C33/06—Making ferrous alloys by melting using master alloys
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- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
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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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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- C21—METALLURGY OF IRON
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D11/00—Process control or regulation for heat treatments
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- C21D6/00—Heat treatment of ferrous alloys
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention relates to the technical field of preparation of alloy high-strength steel, and discloses a preparation process method of manganese-vanadium microalloy high-strength steel, which comprises the following steps of; firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, and the content of the chromium and the molybdenum is respectively 0.3-0.7% and 0.1-0.5%; step two, pretreatment is carried out in the raw materials, which comprises a heat treatment step and a redox step, wherein the heat treatment is carried out to heat the materials to 800-1000 ℃ and keep the temperature for 1-3 hours, and in the redox process, a reducing agent is adopted to reduce the oxide content to 0.07-0.1%; and thirdly, introducing trace alloy elements. The alloy structure is adjusted by controlling the content of the alloy elements and introducing trace alloy elements, the strength and the performance of the steel are improved, the structure is further optimized by the water quenching and heat treatment process, and the strength and the hardness of the steel are enhanced, so that the preparation effect and the quality of the alloy are improved.
Description
Technical Field
The invention relates to the technical field of preparation of alloy high-strength steel, in particular to a preparation process method of manganese-vanadium microalloy high-strength steel.
Background
The material of the reinforcing bar reinforcing rod for the building is an alloy material and is mainly used for actively reinforcing projects such as mines, slopes, tunnel dam banks and the like. The ultimate load bearing capacity, length and concentration of anchoring forces of reinforcing bars have tended to steadily increase over the last decade. Along with the rising of high-rise and super high-rise buildings, spearhead, tunnels and dam banks are built, the reinforcing rods are widely applied, the market demand for the high-strength reinforcing rods is increased, and new requirements for the production process are provided for the high-strength reinforcing rods to improve the stability of engineering structures.
In the conventional high-strength steel preparation method, uniformity of alloy elements and stability of a structure are often challenged, inconsistency of products may be caused, and although the technology of introducing nitrogen elements is helpful to improve nitriding strengthening effect, the current method still has room for improvement in terms of realizing uniform distribution and content control of nitrogen elements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation process method of manganese-vanadium microalloy high-strength steel, which solves the problem that the control content in the preparation process of the high-strength steel at the present stage is improved.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a preparation process method of manganese-vanadium microalloy high-strength steel comprises the following steps of;
Firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, and the content of the chromium and the molybdenum is respectively 0.3-0.7% and 0.1-0.5%;
Step two, pretreatment is carried out in the raw materials, which comprises a heat treatment step and a redox step, wherein the heat treatment is carried out to heat the materials to 800-1000 ℃ and keep the temperature for 1-3 hours, and in the redox process, a reducing agent is adopted to reduce the oxide content to 0.07-0.1%;
introducing trace alloy elements, uniformly distributing the trace elements Ti and Nb by adopting an ion implantation technology or a plasma technology, and controlling the contents of manganese and vanadium to be between 0.5 and 2 percent and 0.1 and 0.5 percent respectively;
Fourthly, high-temperature smelting is carried out in an electric arc furnace or an induction furnace, and the uniformity and stability of an alloy structure are ensured through real-time monitoring of alloy components and a self-adaptive control technology;
And fifthly, adopting a rapid cooling technology, and adjusting the structure of the manganese-vanadium microalloy high-strength steel by using water quenching and combining a subsequent heat treatment process, wherein the water quenching speed is controlled to be 5-20 ℃/s.
Preferably, in the first step, the other alloy elements contained in the scrap steel raw alloy material include nickel, and the content is 0.1-0.4%.
Preferably, in the third step, the trace alloy elements of the ion implantation technology or the plasma technology comprise vanadium, niobium and titanium, and the contents of the trace alloy elements are respectively 0.05 to 0.2 percent, 0.01 to 0.1 percent and 0.01 to 0.1 percent.
Preferably, in the second step, the redox step in the heat treatment process uses a reducing agent, including hydrogen or carbon.
Preferably, in the fourth step, the temperature in the high-temperature smelting process is maintained between 1600 and 1800 ℃ for 1 to 2 hours.
Preferably, in the fifth step, the heat treatment process after rapid cooling includes heating to 1000-1200 ℃ and maintaining for 1-4 hours.
Preferably, in the fifth step, the water quenching speed is changed in a nonlinear manner with the change of temperature, that is, the water quenching speed is gradually reduced with the decrease of temperature.
Preferably, in the fourth step, a graphite covering agent is used in the smelting.
Preferably, in the fourth step, a trace amount of nitrogen element is introduced in the smelting process, and the content of the nitrogen element is controlled to be 0.005-0.02%.
Preferably, in the fourth step, slag is required to be cleaned periodically in the smelting process.
The invention provides a preparation process method of manganese-vanadium microalloy high-strength steel. The beneficial effects are as follows:
According to the invention, the scrap steel containing manganese and vanadium is selected as an original alloy material, the scrap steel resource is utilized, the effective utilization of other alloy elements is realized in the preparation process, the uniform distribution of trace alloy elements is introduced, the content of manganese, vanadium, titanium, niobium and other elements is controlled, the structure of the alloy is regulated, the strength and performance of the steel are improved, the water quenching and the subsequent heat treatment process are used, the structure of the manganese-vanadium microalloy high-strength steel is regulated, the strength and hardness of the steel are further improved, the temperature is maintained, the graphite covering agent is applied, trace nitrogen elements are introduced, the slag is cleaned regularly and the like, and the preparation effect and quality of the alloy are improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
The embodiment of the invention provides a preparation process method of manganese-vanadium microalloy high-strength steel, which comprises the following steps of;
Firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, the content of the other alloy elements is 0.5 percent of chromium and 0.3 percent of molybdenum respectively, the content of the other alloy elements contained in the scrap steel original alloy material comprises nickel and the content of the other alloy elements is 0.2 percent, and the recycling of the scrap steel realizes the comprehensive utilization of resources, thereby being beneficial to reducing the dependence on original ores and reducing the environmental burden;
Step two, pretreatment is carried out in the raw materials, comprising a heat treatment step and a redox step, wherein the heat treatment heats the materials to 890 ℃ and keeps the materials at the temperature for 2 hours, and in the redox process, the reducing agent is adopted to reduce the oxide content to 0.09%, and the heat treatment and the redox step carried out in the raw materials are helpful for purifying the original alloy materials and eliminating bad impurities and oxides, which is helpful for improving the purity of the alloy and providing more favorable conditions for the subsequent process;
Introducing trace alloy elements, uniformly distributing the trace elements Ti and Nb by adopting an ion implantation technology or a plasma technology, and controlling the contents of manganese and vanadium to be between 1.6% and 0.4% respectively, wherein the trace alloy elements of the ion implantation technology or the plasma technology comprise vanadium, niobium and titanium, the contents of the trace alloy elements are 0.13%, 0.08% and 0.07% respectively, and a reducing agent comprising hydrogen or carbon is adopted in the oxidation-reduction step in the heat treatment process, so that uniform distribution of the elements is realized, the formation of a strengthening phase in a grain boundary and a precipitation phase is facilitated, and the performance of the high-strength steel is improved;
Fourthly, high-temperature smelting is carried out in an electric arc furnace or an induction furnace, the uniformity and stability of an alloy structure are ensured by monitoring alloy components and a self-adaptive control technology in real time, the temperature in the high-temperature smelting process is maintained between 1650 ℃ for 1.5h, the uniformity and stability of the alloy structure are ensured, a graphite covering agent is adopted in smelting, the content of the graphite covering agent is controlled to be 0.01% by introducing trace nitrogen elements in the smelting process, slag is required to be cleaned regularly in the smelting process, the smelting process of the alloy is further optimized, and the quality of a finished product is improved;
and fifthly, adopting a rapid cooling technology, using water quenching, and combining a subsequent heat treatment process to adjust the structure of the manganese-vanadium microalloy high-strength steel, wherein the water quenching speed is controlled at 13 ℃/s, the heat treatment process after rapid cooling comprises heating to 1100 ℃, the holding time is 3h, the water quenching speed is changed in a nonlinear manner along with the change of temperature, namely, the water quenching speed is gradually reduced along with the reduction of temperature, the structure of the manganese-vanadium microalloy high-strength steel is adjusted, and the nonlinear adjustment of the water quenching speed is facilitated, so that ideal cooling effect can be obtained at different temperatures, and the strength and toughness of the material are further improved.
High strength steel was prepared by the procedure of example one and the finished product was tested for performance in all respects and the performance data recorded in table one.
Embodiment two:
The embodiment of the invention provides a preparation process method of manganese-vanadium microalloy high-strength steel, which comprises the following steps of;
Firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, the content of the other alloy elements is 0.5 percent of chromium and 0.3 percent of molybdenum respectively, the content of the other alloy elements contained in the scrap steel original alloy material comprises nickel and the content of the other alloy elements is 0.2 percent, and the recycling of the scrap steel realizes the comprehensive utilization of resources, thereby being beneficial to reducing the dependence on original ores and reducing the environmental burden;
Step two, pretreatment is carried out in the raw materials, comprising a heat treatment step and a redox step, wherein the heat treatment heats the materials to 890 ℃ and keeps the materials at the temperature for 2 hours, and in the redox process, the reducing agent is adopted to reduce the oxide content to 0.07%, and the heat treatment and the redox step carried out in the raw materials are helpful for purifying the original alloy materials and eliminating bad impurities and oxides, which is helpful for improving the purity of the alloy and providing more favorable conditions for the subsequent process;
Introducing trace alloy elements, uniformly distributing the trace elements Ti and Nb by adopting an ion implantation technology or a plasma technology, and controlling the contents of manganese and vanadium to be between 1.6% and 0.4% respectively, wherein the trace alloy elements of the ion implantation technology or the plasma technology comprise vanadium, niobium and titanium, the contents of the trace alloy elements are 0.13%, 0.08% and 0.07% respectively, and a reducing agent comprising hydrogen or carbon is adopted in the oxidation-reduction step in the heat treatment process, so that uniform distribution of the elements is realized, the formation of a strengthening phase in a grain boundary and a precipitation phase is facilitated, and the performance of the high-strength steel is improved;
Fourthly, high-temperature smelting is carried out in an electric arc furnace or an induction furnace, the uniformity and stability of an alloy structure are ensured by monitoring alloy components and a self-adaptive control technology in real time, the temperature in the high-temperature smelting process is maintained between 1650 ℃ for 1.5h, the uniformity and stability of the alloy structure are ensured, a graphite covering agent is adopted in smelting, the content of the graphite covering agent is controlled to be 0.01% by introducing trace nitrogen elements in the smelting process, slag is required to be cleaned regularly in the smelting process, the smelting process of the alloy is further optimized, and the quality of a finished product is improved;
and fifthly, adopting a rapid cooling technology, using water quenching, and combining a subsequent heat treatment process to adjust the structure of the manganese-vanadium microalloy high-strength steel, wherein the water quenching speed is controlled at 13 ℃/s, the heat treatment process after rapid cooling comprises heating to 1100 ℃, the holding time is 3h, the water quenching speed is changed in a nonlinear manner along with the change of temperature, namely, the water quenching speed is gradually reduced along with the reduction of temperature, the structure of the manganese-vanadium microalloy high-strength steel is adjusted, and the nonlinear adjustment of the water quenching speed is facilitated, so that ideal cooling effect can be obtained at different temperatures, and the strength and toughness of the material are further improved.
High strength steel was prepared following the procedure of example two and the finished product was tested for performance in each aspect and the performance data recorded in table one.
Embodiment III:
The embodiment of the invention provides a preparation process method of manganese-vanadium microalloy high-strength steel, which comprises the following steps of;
Firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, the content of the other alloy elements is 0.5 percent of chromium and 0.3 percent of molybdenum respectively, the content of the other alloy elements contained in the scrap steel original alloy material comprises nickel and the content of the other alloy elements is 0.2 percent, and the recycling of the scrap steel realizes the comprehensive utilization of resources, thereby being beneficial to reducing the dependence on original ores and reducing the environmental burden;
Step two, pretreatment is carried out in the raw materials, comprising a heat treatment step and a redox step, wherein the heat treatment heats the materials to 890 ℃ and keeps the materials at the temperature for 2 hours, and in the redox process, the reducing agent is adopted to reduce the oxide content to 0.1%, and the heat treatment and the redox step carried out in the raw materials are helpful for purifying the original alloy materials and eliminating bad impurities and oxides, which is helpful for improving the purity of the alloy and providing more favorable conditions for the subsequent process;
Introducing trace alloy elements, uniformly distributing the trace elements Ti and Nb by adopting an ion implantation technology or a plasma technology, and controlling the contents of manganese and vanadium to be between 1.6% and 0.4% respectively, wherein the trace alloy elements of the ion implantation technology or the plasma technology comprise vanadium, niobium and titanium, the contents of the trace alloy elements are 0.13%, 0.08% and 0.07% respectively, and a reducing agent comprising hydrogen or carbon is adopted in the oxidation-reduction step in the heat treatment process, so that uniform distribution of the elements is realized, the formation of a strengthening phase in a grain boundary and a precipitation phase is facilitated, and the performance of the high-strength steel is improved;
Fourthly, high-temperature smelting is carried out in an electric arc furnace or an induction furnace, the uniformity and stability of an alloy structure are ensured by monitoring alloy components and a self-adaptive control technology in real time, the temperature in the high-temperature smelting process is maintained between 1650 ℃ for 1.5h, the uniformity and stability of the alloy structure are ensured, a graphite covering agent is adopted in smelting, the content of the graphite covering agent is controlled to be 0.01% by introducing trace nitrogen elements in the smelting process, slag is required to be cleaned regularly in the smelting process, the smelting process of the alloy is further optimized, and the quality of a finished product is improved;
and fifthly, adopting a rapid cooling technology, using water quenching, and combining a subsequent heat treatment process to adjust the structure of the manganese-vanadium microalloy high-strength steel, wherein the water quenching speed is controlled at 13 ℃/s, the heat treatment process after rapid cooling comprises heating to 1100 ℃, the holding time is 3h, the water quenching speed is changed in a nonlinear manner along with the change of temperature, namely, the water quenching speed is gradually reduced along with the reduction of temperature, the structure of the manganese-vanadium microalloy high-strength steel is adjusted, and the nonlinear adjustment of the water quenching speed is facilitated, so that ideal cooling effect can be obtained at different temperatures, and the strength and toughness of the material are further improved.
High strength steel was prepared following the procedure of example three and the finished product was tested for performance in all respects and the performance data recorded in table one.
List one
In summary, the method selects the scrap steel containing manganese and vanadium as the original alloy material, utilizes the scrap steel resource, realizes the effective utilization of other alloy elements in the preparation process, and is beneficial to the improvement of the preparation effect and quality of the alloy by introducing the uniform distribution of trace alloy elements, controlling the content of manganese, vanadium, titanium, niobium and other elements, improving the strength and performance of the steel, using water quenching and subsequent heat treatment processes, further improving the strength and hardness of the steel, maintaining the temperature, applying a graphite covering agent, introducing trace nitrogen elements, cleaning slag regularly and the like.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The preparation process of the manganese-vanadium microalloy high-strength steel is characterized by comprising the following steps of;
Firstly, selecting scrap steel containing manganese and vanadium as an original alloy material, wherein other alloy elements contained in the scrap steel comprise chromium and molybdenum, the content of the other alloy elements is 0.3-0.7% of chromium and 0.1-0.5% of molybdenum respectively, and the content of the other alloy elements contained in the original alloy material of the scrap steel comprises nickel and is 0.1-0.4%;
step two, preprocessing the raw materials, including heat treatment and oxidation reduction, wherein the heat treatment heats the materials to 800-1000 ℃ and keeps the temperature for 1-3 h, in the oxidation reduction process, reducing the oxide content to 0.07-0.1% by adopting a reducing agent, and the oxidation reduction step in the heat treatment process adopts the reducing agent comprising hydrogen or carbon;
Introducing trace alloy elements, namely uniformly distributing the trace elements Ti and Nb by adopting an ion implantation technology, and controlling the contents of manganese and vanadium to be between 0.5 and 2 percent and 0.1 and 0.5 percent respectively, wherein the trace alloy elements of the ion implantation technology comprise vanadium, niobium and titanium, and the contents of the trace alloy elements are 0.05 to 0.2 percent, 0.01 to 0.1 percent and 0.01 to 0.1 percent respectively;
Fourthly, high-temperature smelting is carried out in an electric arc furnace or an induction furnace, the uniformity and the stability of an alloy structure are ensured through real-time monitoring of alloy components and a self-adaptive control technology, the temperature in the high-temperature smelting process is maintained between 1600 ℃ and 1800 ℃ for 1 to 2 hours, and the content of nitrogen elements is controlled to be 0.005 to 0.02 percent through introducing trace nitrogen elements in the smelting process;
and fifthly, adopting a rapid cooling technology, using water quenching, and combining a subsequent heat treatment process to adjust the structure of the manganese-vanadium microalloy high-strength steel, wherein the water quenching speed is controlled to be 5-20 ℃/s, and the heat treatment process after rapid cooling comprises heating to 1000-1200 ℃ and keeping for 1-4 h.
2. The process for preparing the manganese-vanadium microalloyed high-strength steel according to claim 1, wherein in the fifth step, the water quenching speed is changed in a nonlinear manner along with the change of temperature, namely, the water quenching speed is gradually reduced along with the decrease of temperature.
3. The process for preparing the manganese-vanadium microalloyed high-strength steel according to claim 1, wherein in the fourth step, a graphite covering agent is adopted in smelting.
4. The process for preparing the manganese-vanadium microalloyed high-strength steel according to claim 1, wherein in the fourth step, slag is required to be cleaned periodically in the smelting process.
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| US5415706A (en) * | 1993-05-28 | 1995-05-16 | Abb Management Ag | Heat- and creep-resistant steel having a martensitic microstructure produced by a heat-treatment process |
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| CA3021829C (en) * | 2016-04-27 | 2023-02-21 | Sumitomo Metal Mining Co., Ltd. | Oxide ore smelting method |
| CN108842115A (en) * | 2018-09-03 | 2018-11-20 | 合肥久新不锈钢厨具有限公司 | A kind of anti-bacteria stainless steel of high tenacity |
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| CN1973057A (en) * | 2004-04-02 | 2007-05-30 | 拉夫伯勒大学企业有限公司 | High chromium ferritic steel with 0.5 atomic % hafnium, part of which is ion implanted |
| CN106435373A (en) * | 2016-12-21 | 2017-02-22 | 重庆中鼎三正科技有限公司 | Low-alloy high-strength hydrogen sulphide-proof steel and preparation method thereof |
| CN110964962A (en) * | 2019-12-23 | 2020-04-07 | 河钢股份有限公司承德分公司 | Preparation method of 50 ferrovanadium and 50 ferrovanadium prepared by using same |
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