CN116694991A - Niobium-titanium microalloyed HRB500E deformed steel bar and preparation method thereof - Google Patents
Niobium-titanium microalloyed HRB500E deformed steel bar and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001275 Niobium-titanium Inorganic materials 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005275 alloying Methods 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- JJDMLFNHUCHZOX-UHFFFAOYSA-N [Ti].[Si].[Ca] Chemical compound [Ti].[Si].[Ca] JJDMLFNHUCHZOX-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 4
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- PWKWDCOTNGQLID-UHFFFAOYSA-N [N].[Ar] Chemical compound [N].[Ar] PWKWDCOTNGQLID-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005253 cladding Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000010955 niobium Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 7
- 229910000756 V alloy Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000007545 Vickers hardness test Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000010310 metallurgical process Methods 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ABLLXXOPOBEPIU-UHFFFAOYSA-N niobium vanadium Chemical compound [V].[Nb] ABLLXXOPOBEPIU-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
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- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses niobium-titanium microalloyed HRB500E deformed steel bar which is characterized by comprising the following chemical components in percentage by mass: c:0.22 to 0.25 percent, si:0.30 to 0.50 percent, mn:1.2 to 1.5 percent, nb:0.020 to 0.025 percent, ti:0.015 to 0.022 percent, N: 0.011-0.015%, P less than or equal to 0.025%, S less than or equal to 0.018%, and the balance Fe and unavoidable impurities. Its preparing process is also disclosed. The Rel of the screw-thread steel prepared by the invention is more than or equal to 530MPa, rm is more than or equal to 700MPa, rm/Rel is more than or equal to 1.25, and Agt is more than or equal to 12%.
Description
Technical Field
The invention relates to the technical field of steel materials, in particular to niobium-titanium microalloyed HRB500E threaded steel and a preparation method thereof.
Background
The infrastructure construction in china remains very active for some time now and in the future, and screw-thread steel will continue to take up significant and considerable proportions in steel consumption. Therefore, the screw thread steel is still a single steel series with the largest domestic sales volume within a period, and the sales rate in recent years is in the form of hundred million tons, and the screw thread steel is one of the most main production varieties of small and medium-sized steel factories in China due to relatively low equipment requirements and technical difficulties.
In order to realize the product upgrading of the screw-thread steel, a new screw-thread steel standard GB/T1499.2-2018 is published and forced to be implemented on the 11 th month 1 of 2018. The new standard cancels 335MPa grade steel bars, increases 600MPa grade steel bars, and is practically suitable for the requirements of green buildings; properly tightening the weight deviation, and determining that the weight deviation is not allowed to be checked; the method has the advantages that the regulations of a steel bar fatigue test method are increased, and particularly, the regulations of metallographic structure inspection are increased; the contents of Vickers hardness, macroscopic metallography, microstructure, inspection method and the like of the cross section are increased.
The implementation of a new national standard of deformed steel bars has an important influence on the development of industry. In particular, the provision for increasing metallographic structure and Vickers hardness test: the structure is mainly ferrite and pearlite, the base circle does not generate tempered martensite structure, and the difference of hardness of two points in Vickers hardness test is smaller than or equal to 40Hv. At present, most of medium and small section steel enterprises engaged in the production of deformed steel bars in China adopt a method of improving yield strength by strong water penetration so as to save alloying cost, the metallurgical structure of the outer edge of the medium and small section steel is basically a martensitic structure, the implementation of a new national standard is a great strike to the enterprises and the strong water penetration and controlled rolling and cooling processes, the alloying cost is obviously increased after the medium and small section steel enterprises return to a path of improving strength by alloy, and the method is a great challenge to the cost and process stability control of the enterprises. At present, vanadium alloy is commonly adopted for alloying of the screw steel in China, so that the strength of a finished product is improved, and the aim of mechanical properties is ensured to be achieved.
At present, with the development of the construction engineering to the ultra-high, ultra-large and high anti-seismic direction, the foreign construction generally uses 500 MPa-grade steel bars with good welding performance and high strength, but 400 MPa-grade steel bars are still mainly used in the construction or infrastructure field in China, so that the expansion application of 500 MPa-grade screw thread steel is promoted, the upgrading and upgrading of the screw thread steel are promoted, and the method has positive significance for realizing the reduction application of steel, improving the engineering quality and saving the construction cost.
At present, the alloy reinforcement is realized by adding vanadium alloy in the production process of HRB500 screw steel, but the vanadium alloy belongs to a shortage resource in China, the price is always in a high position, and the price is greatly increased along with the implementation of a new national standard. The method has certain influence on the cost control of production enterprises and application units, so that the alloying cost is reduced by optimizing a component system, and the method is very important for promoting the expansion application of HRB500 screw-thread steel.
In the aspect of optimizing HRB500 threaded steel alloy, some iron and steel enterprises make positive attempts, and the core of the method is to add a certain amount of Nb to replace part V for alloying, for example, articles such as "strengthening mechanism of a niobium microalloying controlled cooling technology for producing HRB500 anti-seismic steel bars" of the university of Kunming university Chen Wei, etc., and "development of a converter niobium vanadium composite microalloying HRB500E high-strength anti-seismic steel bar of Guangdong Steel stock Guo Chuxiong, etc., all propose a method for adding about 0.03% of Nb for microalloying strengthening. However, when Nb is added, the alloy cannot completely replace V for alloying, and more than 0.035% of Nb is easy to crack, the production efficiency and the yield are affected, and meanwhile, the performance stability of the finished product is affected by the addition of Nb, particularly, the yield strength is not obvious, and the yield ratio is low.
The titanium resources in China are rich, the production process is mature, the market price is stable for a long time, the alloy strengthening effect of the titanium alloy is verified in a plurality of steels, a certain influence exists in the production of HRB400E threaded steel at present, but the application of the titanium alloy in HRB500E threaded steel is not reported, in practice, the titanium-niobium composite microalloying can reduce the adverse influence of niobium on the continuous casting process and the finished product performance.
Disclosure of Invention
Aiming at the problems that the alloy reinforcement is realized mainly by adding vanadium alloy in the current HRB500E threaded steel production process, the vanadium alloy is high in price and the cost is difficult to control for production enterprises and use units, the invention aims to provide the niobium-titanium microalloyed HRB500E threaded steel and the preparation method thereof, and the invention aims to realize the low-cost stable batch production of the HRB500E by optimizing an alloy system based on the production of the HRB500E threaded steel by a 7-flow square billet continuous casting metallurgical process of a 150 ton combined blown converter smelting-LF refining-7 machine.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to niobium-titanium microalloyed HRB500E threaded steel, which comprises the following chemical components in percentage by mass: c:0.22 to 0.25 percent, si:0.30 to 0.50 percent, mn:1.2 to 1.5 percent, nb:0.020 to 0.025 percent, ti:0.015 to 0.022 percent, N: 0.011-0.015%, P less than or equal to 0.025%, S less than or equal to 0.018%, and the balance Fe and unavoidable impurities.
Further, the paint comprises the following chemical components in percentage by mass: c:0.24%, si:0.46%, mn:1.41%, nb:0.023%, ti:0.018%, N:0.015%, P0.019%, S0.013%, and the balance of Fe and unavoidable impurities.
A preparation method of niobium-titanium microalloyed HRB500E deformed steel bar mainly comprises the following steps:
(1) Converter smelting process
(1) Molten iron smelting is carried out in a 150 ton converter, nitrogen is supplied in the whole process of bottom blowing, nitrogen-argon switching is not carried out, the terminal temperature range is 1620-1660 ℃, a medium-high carbon tapping mode is adopted, the oxidability of the molten steel terminal is reduced, the alloy yield is improved, the content of terminal C is controlled to be 0.06-0.08%, the content of P is controlled to be less than or equal to 0.02%, and the content of S is controlled to be less than or equal to 0.018;
(2) before tapping, active lime of 5-6 kg/t steel is placed at the bottom of a molten steel tank, after tapping 1/3, alloys such as silicon-manganese, ferroniobium, ferroaluminum and the like are poured into the molten steel tank for deoxidization and alloying, and the adding amount is based on the requirement of a finished product; nitrogen is blown to the bottom of the ladle in the whole tapping process, and the nitrogen blowing flow is 300-400L/min;
(3) After molten steel is treated outside the furnace (1) to an argon station, continuously blowing nitrogen at the flow rate of 800-1000L/min, simultaneously adding 50-60 kg of aluminum particles into the molten steel for deep deoxidation, and after the deoxidation process is finished for 2-4 min, moving a molten steel tank to an LF procedure for treatment, wherein the total treatment time of the argon station is 6-8 min; (2) after steel arrives at an LF station, 8-10 kg/t of active lime is added into a molten steel tank immediately, electric heating and temperature adjustment are carried out, aluminum particles are added into the slag surface to quickly produce white slag, nitrogen is blown and stirred in the whole process, the nitrogen flow rate in the stirring treatment process is 500-600L/min, the treatment is carried out for 12-18 min, the temperature range is 1560-1585 ℃, when the dissolved oxygen content of molten steel is below 10ppm, a calcium titanium silicon nitride composite cored wire is fed into the molten steel tank through a wire feeder, the wire feeding speed is 5-6 m/min, the feeding amount is 4-5 m/t of steel, after wire feeding, the soft blowing is carried out for 3min by adopting the bottom blowing nitrogen flow rate of 250-300L/min, the molten steel is uniformly mixed, and then the molten steel tank is lifted to a continuous casting platform for casting;
(3) The continuous casting process is continuous casting, namely, a long water gap of a molten steel tank and a submerged water gap of a crystallizer are provided, the pulling speed is controlled to be 2.4-2.6 m/min according to the temperature of molten steel in a tundish, a forced cooling mode is adopted for secondary cooling, the specific water quantity is 1.5-1.6L/kg, and casting blanks are heated to a heating furnace for heating after casting is completed;
(4) The temperature of the casting blank heating and rolling casting blank soaking section is 1120-1150 ℃, the rolling is carried out according to a non-controlled cooling mode when the furnace time is more than or equal to 4 hours, and the water cooling is not forced in the rolling process and the rolling process.
Further, the calcium titanium silicon nitride composite cored wire is prepared from Q195 iron sheet cladding core powder with the thickness of 0.4mm, and the core powder comprises the following components in percentage by mass: ti: 28-32%, N: 9-10%, si: 25-28%, ca: 8-10%, and the balance being Fe and unavoidable impurities; the content of the cored wire core powder is 280+/-5 g/m.
Further, the iron sheet comprises the following elements in percentage by mass: c is less than or equal to 0.09%, si is less than or equal to 0.03%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, and Alt:0.02-0.06%, and the balance of Fe and unavoidable impurities.
Furthermore, rel of the screw thread steel is more than or equal to 530MPa, rm is more than or equal to 700MPa, rm/Rel is more than or equal to 1.25, and Agt is more than or equal to 12%.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) The Nb+Ti composite microalloying is used for replacing V microalloying, so that the HRB500E low-cost stable batch production is realized, the use of V is obviously reduced and avoided, and the alloy cost is reduced.
(2) By a specific method, the stability problem of Ti yield is solved, and the existence of Ca can control the oxidizing property of molten steel and reduce the oxidation loss of Ti.
(3) Through the whole flow control, the nitrogen enrichment of the molten steel is realized, so that a great amount of nitrogen-containing precipitates of Nb and Ti are precipitated, and the precipitation strengthening effect is maximized.
Compared with the prior art, on the steel components, the invention uses the niobium-titanium alloy to replace V for alloying, so that Nb:0.020 to 0.025 percent, ti:0.015 to 0.022 percent without adding V alloy, so as to greatly reduce the alloying production cost; in the smelting method, nitrogen is blown at the bottom in the whole process to enrich and nitride molten steel, LF refining is performed, a calcium titanium silicon nitride composite cored wire is fed, so that Ti composite microalloying and nitriding of the molten steel are realized, and a large amount of nitrogen-containing precipitates are separated out in the solidification process under the condition of nitrogen enrichment, so that a precipitation strengthening effect is realized.
Rel of the screw-thread steel is more than or equal to 530MPa, rm is more than or equal to 700MPa, rm/Rel is more than or equal to 1.25, and Agt is more than or equal to 12%.
Detailed Description
In order to better explain the technical solution of the present invention, the following description will further explain the technical solution of the present invention by referring to specific examples, which are merely illustrative of the technical solution of the present invention and are not intended to limit the present invention in any way.
Table 1 below is a mass percentage list of chemical components contained in the screw-thread steel of each example of the present invention and comparative example; table 2 below is a list of values of various process parameters in the preparation method of the screw-thread steel according to various embodiments of the present invention and comparative examples; table 3 below shows the results of mechanical property tests for the screw-threaded steels according to the examples and comparative examples of the present invention.
The preparation method of the niobium-titanium microalloyed HRB500E threaded steel is prepared by a 150 ton combined blown converter smelting-LF refining-7 machine 7 flow square billet continuous casting metallurgical process, wherein the main process steps are as follows:
(1) In the converter smelting process (1), molten iron smelting is carried out in a 150-ton converter, nitrogen is supplied in the whole process of bottom blowing, nitrogen-argon switching is not carried out, the terminal temperature range is 1620-1660 ℃, a medium-high carbon tapping mode is adopted, the oxidability of the molten steel terminal is reduced, the alloy yield is improved, the content of C in the terminal is controlled to be 0.06-0.08%, the content of P is controlled to be less than or equal to 0.02%, and the content of S is controlled to be less than or equal to 0.018; (2) before tapping, active lime of 5-6 kg/t steel is placed at the bottom of a molten steel tank, after tapping 1/3, alloys such as silicon-manganese, ferroniobium, ferroaluminum and the like are poured into the molten steel tank for deoxidization and alloying, and the adding amount is based on the requirement of a finished product; nitrogen is blown to the bottom of the ladle in the whole tapping process, and the nitrogen blowing flow is 300-400L/min;
(2) After molten steel is treated outside the furnace (1) to an argon station, continuously blowing nitrogen at the flow rate of 800-1000L/min, simultaneously adding 50-60 kg aluminum particles into the molten steel for deep deoxidation, and after the deoxidation process is finished for 2-4 min, moving a molten steel tank to an LF procedure for treatment, wherein the total treatment time of the argon station is 6-8 min; (2) adding 8-10 kg/t of active lime into a molten steel tank immediately after steel reaches an LF station, carrying out electric heating and temperature adjustment, adding aluminum particles into the slag surface to quickly produce white slag, carrying out bottom blowing nitrogen stirring in the whole process, wherein the nitrogen flow in the stirring treatment process is 500-600L/min, treating for 12-18 min, adding ferroniobium in the process to realize micro-alloying of niobium, and feeding a calcium titanium silicon nitride composite cored wire into the molten steel tank through a wire feeder when the dissolved oxygen content of molten steel is below 10ppm, wherein the wire feeding speed is 5-6 m/min, the feeding amount is 4-5 m/t of steel, carrying out soft blowing for more than 3min by adopting bottom blowing nitrogen flow of 250-300L/min after wire feeding, so that molten steel is uniformly mixed, and then lifting the molten steel tank to a continuous casting platform for casting;
(3) The continuous casting process is continuous casting, namely, a long water gap of a molten steel tank and a submerged water gap of a crystallizer are provided, the pulling speed is controlled to be 2.4-2.6 m/min according to the temperature of molten steel in a tundish, a forced cooling mode is adopted for secondary cooling, the specific water quantity is 1.5-1.6L/kg, and a casting blank is sent to a heating furnace to be heated when the casting is finished;
(4) The temperature of the casting blank heating and rolling casting blank soaking section is 1120-1150 ℃, the rolling is carried out according to a non-controlled cooling mode when the furnace time is more than or equal to 4 hours, and the water cooling is not forced in the rolling process and the rolling process.
TABLE 1 chemical compositions (wt.%)
Table 2 list of values of the main process parameters for each example and comparative example of the present invention
TABLE 3 mechanical test results for the screw-threaded steels of the examples and comparative examples of the invention
Mechanical property analysis: from the table above, it can be seen that the mechanical properties of the niobium-titanium composite microalloyed HRB500E screw steel by the method are equivalent to those of similar products alloyed by vanadium.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. The niobium-titanium microalloyed HRB500E threaded steel is characterized by comprising the following chemical components in percentage by mass: c:0.22 to 0.25 percent, si:0.30 to 0.50 percent, mn:1.2 to 1.5 percent, nb:0.020 to 0.025 percent, ti:0.015 to 0.022 percent, N: 0.011-0.015%, P less than or equal to 0.025%, S less than or equal to 0.018%, and the balance Fe and unavoidable impurities.
2. The niobium-titanium microalloyed HRB500E screw-threaded steel of claim 1, comprising the following chemical components in mass percent: c:0.24%, si:0.46%, mn:1.41%, nb:0.023%, ti:0.018%, N:0.015%, P0.019%, S0.013%, and the balance of Fe and unavoidable impurities.
3. The method for preparing the niobium-titanium microalloyed HRB500E screw-thread steel according to claim 1 or 2, wherein the main process steps are as follows:
(1) Converter smelting process
(1) Molten iron smelting is carried out in a 150 ton converter, nitrogen is supplied in the whole process of bottom blowing, nitrogen-argon switching is not carried out, the terminal temperature range is 1620-1660 ℃, a medium-high carbon tapping mode is adopted, the oxidability of the molten steel terminal is reduced, the alloy yield is improved, the content of terminal C is controlled to be 0.06-0.08%, the content of P is controlled to be less than or equal to 0.02%, and the content of S is controlled to be less than or equal to 0.018;
(2) before tapping, active lime of 5-6 kg/t steel is placed at the bottom of a molten steel tank, after tapping 1/3, alloys such as silicon-manganese, ferroniobium, ferroaluminum and the like are poured into the molten steel tank for deoxidization and alloying, and the adding amount is based on the requirement of a finished product; nitrogen is blown to the bottom of the ladle in the whole tapping process, and the nitrogen blowing flow is 300-400L/min;
(2) After molten steel is treated outside the furnace (1) to an argon station, continuously blowing nitrogen at the flow rate of 800-1000L/min, simultaneously adding 50-60 kg of aluminum particles into the molten steel for deep deoxidation, and after the deoxidation process is finished for 2-4 min, moving a molten steel tank to an LF procedure for treatment, wherein the total treatment time of the argon station is 6-8 min; (2) after steel arrives at an LF station, 8-10 kg/t of active lime is added into a molten steel tank immediately, electric heating and temperature adjustment are carried out, aluminum particles are added into the slag surface to quickly produce white slag, nitrogen is blown and stirred in the whole process, the nitrogen flow rate in the stirring treatment process is 500-600L/min, the treatment is carried out for 12-18 min, the temperature range is 1560-1585 ℃, when the dissolved oxygen content of molten steel is below 10ppm, a calcium titanium silicon nitride composite cored wire is fed into the molten steel tank through a wire feeder, the wire feeding speed is 5-6 m/min, the feeding amount is 4-5 m/t of steel, after wire feeding, the soft blowing is carried out for 3min by adopting the bottom blowing nitrogen flow rate of 250-300L/min, the molten steel is uniformly mixed, and then the molten steel tank is lifted to a continuous casting platform for casting;
(3) The continuous casting process is continuous casting, namely, a long water gap of a molten steel tank and a submerged water gap of a crystallizer are provided, the pulling speed is controlled to be 2.4-2.6 m/min according to the temperature of molten steel in a tundish, a forced cooling mode is adopted for secondary cooling, the specific water quantity is 1.5-1.6L/kg, and casting blanks are heated to a heating furnace for heating after casting is completed;
(4) The temperature of the casting blank heating and rolling casting blank soaking section is 1120-1150 ℃, the rolling is carried out according to a non-controlled cooling mode when the furnace time is more than or equal to 4 hours, and the water cooling is not forced in the rolling process and the rolling process.
4. The preparation method of the niobium-titanium microalloyed HRB500E threaded steel, according to claim 3, is characterized in that the calcium titanium silicon nitride composite cored wire is prepared from Q195 iron sheet cladding core powder with the thickness of 0.4mm, and the core powder comprises the following components in percentage by mass: ti: 28-32%, N: 9-10%, si: 25-28%, ca: 8-10%, and the balance being Fe and unavoidable impurities; the content of the cored wire core powder is 280+/-5 g/m.
5. The preparation method of the niobium-titanium microalloyed HRB500E deformed steel bar according to claim 4, wherein the iron sheet comprises the following elements in percentage by mass: c is less than or equal to 0.09%, si is less than or equal to 0.03%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, and Alt:0.02-0.06%, and the balance of Fe and unavoidable impurities.
6. The method for preparing the niobium-titanium microalloyed HRB500E deformed steel bar according to claim 3, wherein Rel of the deformed steel bar is greater than or equal to 530MPa, rm is greater than or equal to 700MPa, rm/Rel is greater than or equal to 1.25, and Agt is greater than or equal to 12%.
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| CN111270126A (en) * | 2020-03-10 | 2020-06-12 | 阳春新钢铁有限责任公司 | Niobium-titanium-nitrogen and titanium-nitrogen composite microalloyed HRB400E steel bar and production method thereof |
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