CN102703813A - Vanadium and titanium compound microalloyed steel bar and production method thereof - Google Patents
Vanadium and titanium compound microalloyed steel bar and production method thereof Download PDFInfo
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- CN102703813A CN102703813A CN2012102155883A CN201210215588A CN102703813A CN 102703813 A CN102703813 A CN 102703813A CN 2012102155883 A CN2012102155883 A CN 2012102155883A CN 201210215588 A CN201210215588 A CN 201210215588A CN 102703813 A CN102703813 A CN 102703813A
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Abstract
The invention discloses a vanadium and titanium compound microalloyed steel bar and a production method thereof. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.001 to 0.12 percent of Ti, 0.001 to 0.10 percent of V, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The production method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, trimming the components to make the components meet the component requirement of the steel bar, and casting; and c, performing hot rolling, wherein alloying vanadium and titanium after deoxidizing in the process of tapping, or in the process of refining. According to the vanadium and titanium compound microalloyed steel bar, the yield strength and the tensile strength of the steel are improved under the condition of not changing the ductility of the steel, and the performance requirements of the steel bars in 400 MPa or 500 MPa of grades are met.
Description
Technical field
The invention belongs to ferrous metallurgy micro-alloying technology field, be specifically related to a kind of Steel Concrete with hot rolling vanadium titanium-combined microalloying reinforcing bar and working method thereof.
Background technology
At present, China is in industriallization and urbanization fast-developing period, and construction industry is very swift and violent to the speed of large scale development.Construction industry is to large scale development, and for improving the security of building, building trade generally adopts the hot rolled ribbed steel bar of HS, high welding performance to replace regular reinforcement both at home and abroad.In addition; Along with China promotes the appearance that high strength cast iron uses policy; To be eliminated gradually with the following low strength reinforcing bar of 335MPa levels such as HRB335; Other hot rolled ribbed steel bar of HRB400 and higher level thereof will be greatly developed, and new revised national standard " Steel Concrete is used hot rolled ribbed steel bar " also will increase the HRB600 reinforcing bar.
The production technology of High Strength Steel Bar is mainly taked the measure of microalloying, is a new and high technology in ferrous metallurgy field, also is the main technological route that each steel mill produces 500MPa and the employing of above rank reinforcing bar at present.The microalloying of steel mainly uses V, Nb, V-N is compound, V-Nb is compound etc. to the strengthening effect of steel, makes the reinforcing bar under the hot-rolled state can obtain performances such as HS, H.T., high weldableness.But vanadium and alloy thereof, niobium and alloy production cost thereof are higher, have tied up the anxiety that the enterprise profit spatial also causes vanadium, niobium resource simultaneously, are unfavorable for the production of 400MPa level and above high strength cast iron and apply.
The Panxi Diqu vanadium and titanium resources that is richly stored with, molten iron still contains a certain amount of vanadium and titanium after vanadium extraction, also contain a certain amount of vanadium and titanium in steel scrap scrap iron, the slag slag iron.With vanadium reinforcing bar being carried out the precipitation strength of microalloy carbonitride is used widely; The austenite crystal that utilizes little titanium to handle the refinement reinforcing bar also is applied; But utilize vanadium titanium-combined microalloying (promptly with Ti substitute part of V) simultaneously, replace containing the V second phase reinforcing steel bar mutually and also do not appear in the newspapers to contain Ti second.
Summary of the invention
Technical problem to be solved by this invention provides a kind of vanadium titanium-combined microalloying 400MPa level and above high strength cast iron and working method thereof.
The technical solution adopted for the present invention to solve the technical problems is: vanadium titanium-combined microalloying reinforcing bar; The chemical ingredients of steel is by weight: C:0.16～0.25%, Si:0.20～0.80%, Mn:1.20～1.50%, Ti:0.001～0.12%, V:0.001～0.10%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
Wherein, The chemical ingredients of steel is by weight in the above-mentioned reinforcing bar: C:0.22～0.25%, Si:0.50～0.80%, Mn:1.30～1.50%, Ti:0.05～0.12%, V:0.010～0.050%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
Wherein, above-mentioned reinforcing bar is heated to 1100～1300 ℃ with rolling reinforcing bar with steel billet and is incubated 30～150 minutes again before rolling; Be rolled afterwards; Finish rollingly in the time of between 750～950 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
Further; Rolling reinforcing bar is heated to 1150～1250 ℃ with steel billet is incubated 55～125 minutes again, be cooled to 1000～1050 ℃ afterwards and be rolled, finish rolling in the time of between 800～860 ℃; Rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
Wherein, prepare in the alloying process of above-mentioned reinforcing bar, the ferrosilicon-titanium alloy is adopted in the adding of titanium elements, and said ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
The preparation method of above-mentioned vanadium titanium-combined microalloying reinforcing bar comprises the steps:
A, steelmaking feed is smelted into crude steel liquid, deoxidation and alloying are carried out in tapping in the tapping process;
Molten steel after b, the tapping is sent into refining furnace and is carried out refining and trimming, casts after making it satisfy the requirement of reinforcing bar composition, obtains rolling reinforcing bar and uses steel billet;
C, rolling reinforcing bar is heated to 1100～1300 ℃ with steel billet is incubated 30～150 minutes again, be rolled afterwards, finish rollingly in the time of between 750～950 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature;
Wherein, carry out the alloying of vanadium and titanium in tapping process and after the deoxidation or in refining process.
Steelmaking feed of the present invention comprises the molten iron that common iron ore is smelt, molten iron that vanadium titano-magnetite is smelt and/or half steel, dri, cupola furnace molten iron, the iron and steel scrap of recovery and/or slag iron and steel.
Said iron and steel scrap can also can be other steel scraps or a scrap iron on sale on the market for the steel scrap or the scrap iron of Iron And Steel Plant's generation.Said slag iron and steel is meant steel or the iron of selecting in slag or the blast furnace slag.
Wherein, among the aforesaid method step c, rolling reinforcing bar is heated to 1150～1250 ℃ with steel billet is incubated 55～125 minutes again; Being cooled to 1000～1050 ℃ afterwards is rolled; Finish rollingly in the time of between 800～860 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
Wherein, in the aforesaid method alloying process, at least a in ferrotianium, ferrosilicon-titanium alloy, metal titanium or the titaniferous cored-wire adopted in the adding of titanium elements.
Further, in the alloying process, the ferrosilicon-titanium alloy is adopted in the adding of titanium elements, and said ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
Wherein, in the aforesaid method alloying process, the adding of v element is adopted block vanadium iron and/or is contained the vanadium cored-wire.
Wherein, among the aforesaid method step a, it is 1600～1700 ℃ crude steel liquid that steelmaking feed is smelted into temperature, and said crude steel liquid contains [C]≤0.30%, [P]≤0.045%, [S]≤0.10% by weight.
[C] is meant the C that is dissolved in the molten steel.In like manner, [P], [S] refer to be dissolved in P, the S in the molten steel respectively.
Wherein, among the aforesaid method step a, the equipment of steelmaking feed being smelted into crude steel liquid is electric furnace, converter, induction furnace or open hearth.
Wherein, among the aforesaid method step b, said refining furnace is LF, RH, VD or VOD stove.
The invention has the beneficial effects as follows: C content of the present invention is chosen in 0.16～0.25% to obtain typical reinforcing bar tissue: ferritic+pearlitic structure; Mn content is chosen in 1.20～1.50%, mainly utilizes it to reduce the effect and the solution strengthening effect of transformation temperature, refinement ferrite grain size; Si content is chosen in 0.20～0.80%, has higher solid solution strengthening effect, can promote simultaneously to contain Ti and contain V second separating out mutually.The effect of Ti of the present invention stops the deformation austenite to be grown up except forming bigger Ti (CN), also will contain Ti second mutually at a large amount of nano level of formation in rolling and the process of cooling, and contains V second and has together separated out strengthening effect mutually.Soaking time and temperature before the strict control of the present invention hot rolling of steel billet; And finishing temperature, utilize vanadium titanium-combined microalloying (promptly substituting part of V) with Ti, replace containing the V second phase reinforcing steel bar mutually to contain Ti second; And give full play to Si and promote to contain Ti and contain V second separating out mutually; Mechanical propertys such as the ys of raising steel and tensile strength under the condition of the ductility that does not change steel, production cost is low, and product satisfies the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Description of drawings
The compound transmission electron microscope photo of separating out of reinforcing bar Ti, the V that Fig. 1 prepares for the embodiment of the invention three.
Embodiment
Through embodiment the present invention is further described below.
Vanadium titanium-combined microalloying reinforcing bar; The chemical ingredients that it is characterized in that steel is by weight: C:0.16～0.25%, Si:0.20～0.80%, Mn:1.20～1.50%, Ti:0.001～0.12%, V:0.001～0.10%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
Preferably; For the mechanical property that makes above-mentioned reinforcing bar better; Realize the performance requriements of 500MPa grade high-strength reinforcing bar; The chemical ingredients of steel is by weight in the above-mentioned reinforcing bar: C:0.22～0.25%, Si:0.50～0.80%, Mn:1.30～1.50%, Ti:0.05～0.12%, V:0.010～0.050%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
Preferably, better for the mechanical property that makes above-mentioned reinforcing bar, guarantee that above-mentioned reinforcing bar satisfies the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar; Answer the soaking time and the temperature of strict control steel billet, and finishing temperature, therefore; Above-mentioned reinforcing bar is heated to 1100～1300 ℃ with rolling reinforcing bar with steel billet and is incubated 30～150 minutes again before rolling, is rolled afterwards; Finish rollingly in the time of between 750～950 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
Further; Rolling reinforcing bar is heated to 1150～1250 ℃ with steel billet is incubated 55～125 minutes again, be cooled to 1000～1050 ℃ afterwards and be rolled, finish rolling in the time of between 800～860 ℃; Rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
The contriver finds; Though Si can promote to contain Ti simultaneously and contain V second separating out mutually among the present invention; But will guarantee fully that Ti forms a large amount of nano levels and contains Ti second mutually in rolling and process of cooling, together separate out strengthening effect mutually, thereby the mechanical property of raising reinforcing bar with containing V second; Need in tapping process, a [o] (being oxygen activity) be dropped to lower level (greatly below 30ppm) so, therefore the deoxidation cost in tapping process is higher.The present invention is in order fully to guarantee that Ti forms a large amount of nano levels and contains Ti second mutually in casting, rolling and process of cooling; Can satisfy cost requirement again; Preferred adopt another kind of mode to reduce combining of oxygen and titanium, contain Ti second phase thereby form a large amount of nano levels, promptly in the alloying process for preparing above-mentioned reinforcing bar; The ferrosilicon-titanium alloy is adopted in the adding of titanium elements, and said ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.The present invention adopts the ferrosilicon-titanium alloy, because of the special combination of its titanium and silicon, in alloying process, has reduced combining of titanium and oxygen, thereby has reduced the requirement to deoxidation, has improved the yield of titanium, has also just reduced alloy addition, has reduced cost.Ferrosilicon-titanium alloy according to the invention comprises block or Powdered ferrosilicon-titanium alloy, also comprises the cored-wire of processing with Powdered ferrosilicon-titanium alloy.
The preparation method of above-mentioned vanadium titanium-combined microalloying reinforcing bar comprises the steps:
A, steelmaking feed is smelted into crude steel liquid, deoxidation and alloying are carried out in tapping in the tapping process;
Molten steel after b, the tapping is sent into refining furnace and is carried out refining and trimming, casts after making it satisfy the requirement of reinforcing bar composition, obtains rolling reinforcing bar and uses steel billet;
C, rolling reinforcing bar is heated to 1100～1300 ℃ with steel billet is incubated 30～150 minutes again, be rolled afterwards, finish rollingly in the time of between 750～950 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature;
Wherein, carry out the alloying of vanadium and titanium in tapping process and after the deoxidation or in refining process.
The temperature and the soaking time of the heating of the strict control of the present invention steel billet, and the temperature of finish to gauge, purpose is in order to improve the mechanical property of reinforcing bar, to make it satisfy the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Preferably; Better for the mechanical property that makes reinforcing bar, among the aforesaid method step c, rolling reinforcing bar is heated to 1150～1250 ℃ with steel billet is incubated 55～125 minutes again; Being cooled to 1000～1050 ℃ afterwards is rolled; Finish rollingly in the time of between 800～860 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
Preferably, in the aforesaid method alloying process, at least a in ferrotianium, ferrosilicon-titanium alloy, metal titanium or the titaniferous cored-wire adopted in the adding of titanium elements.
Further, in order to practice thrift cost, in the alloying process, the ferrosilicon-titanium alloy is adopted in the adding of titanium elements, and said ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
Preferably, in the aforesaid method alloying process, the adding of v element is adopted block vanadium iron and/or is contained the vanadium cored-wire.
Preferably; For necessary temperature and member condition is provided to subsequent handling; Among the aforesaid method step a, it is 1600～1700 ℃ crude steel liquid that steelmaking feed is smelted into temperature, and said crude steel liquid contains [C]≤0.30%, [P]≤0.045%, [S]≤0.10% by weight.
Wherein, among the aforesaid method step a, the equipment of steelmaking feed being smelted into crude steel liquid is electric furnace, converter, induction furnace or open hearth.
Wherein, among the aforesaid method step b, said refining furnace is LF, RH, VD or VOD stove.
Through embodiment the specific embodiment of the invention is described further below, but therefore protection scope of the present invention is not limited among the embodiment.
Embodiment 1
(1) be raw material production HRB400 reinforcing bar with slag iron, become crude steel liquid through measures such as slag making, oxygen blast through electrosmelting, crude steel liquid contains [C] 0.13%, [P] 0.019%, [S] 0.070%, [N] 67ppm, a [o] 68ppm; 1678 ℃ of temperature; Reach specified requirement, deoxidation alloying is carried out in tapping in the tapping process then; Vanadium and titanium are block Ti-23wt%Si-26wt%Fe and the adding of V-25wt%Fe master alloy form of 25mm through granularity; Molten steel behind the deoxidation alloying send refining of LF stove and trimming, and the gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be rolled 820 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 2
(1) be raw material production HRB400 reinforcing bar with the slag steel, become crude steel liquid through measures such as slag making, oxygen blast through electrosmelting, composition contains [C] 0.17%, [P] 0.020%, [S] 0.080%, [N] 63ppm, a [o] 65ppm; Temperature reaches 1685 ℃, reaches specified requirement, then tapping; Carry out deoxidation alloying in the tapping process; Titanium adds through Ti-45wt%Si-10wt%Fe cored-wire form respectively, and content of vanadium is a residual quantity in the slag steel, and the molten steel behind the deoxidation alloying send refining of LF stove and trimming; The gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1230 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1050 ℃, be rolled 850 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 3
(1) be raw material production HRB400 reinforcing bar with slag steel and slag iron; Become crude steel liquid through measures such as slag making, oxygen blast through converter smelting, crude steel liquid contains [C] 0.16%, [P] 0.016%, [S] 0.073%, [N] 60ppm, a [o] 60ppm, 1682 ℃ of temperature; Reach specified requirement; Deoxidation alloying is carried out in tapping in the tapping process then, and vanadium and titanium are that the block Ti-57wt%Si-15wt%Fe of 50mm and the molten steel behind the V-25wt%Fe master alloy form adding deoxidation alloying send refining of RH stove and trimming through granularity respectively; The gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1180 ℃ of insulations 2 hours.
(3) with above-mentioned heating strand air cooling or water-cooled to 1000 ℃, be rolled 800 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 4
(1) with blast-melted is raw material production HRB400 reinforcing bar; Become crude steel liquid through measures such as slag making, oxygen blast through converter smelting, crude steel liquid contains [C] 0.12%, [P] 0.022%, [S] 0.093%, [N] 65ppm, a [o] 63ppm, 1679 ℃ of temperature; Reach the specified requirement tapping; Carry out deoxidation alloying in the tapping process, vanadium and titanium add through Ti-35wt%Fe and V-25wt%Fe cored-wire form respectively, and the molten steel behind the deoxidation alloying send refining of LF stove and trimming; The gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1040 ℃, be rolled 850 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 5
(1) be raw material production HRB500 reinforcing bar with slag iron; Become crude steel liquid through measures such as slag making, oxygen blast through electrosmelting, composition and temperature are tapped after reaching specified requirement, carry out deoxidation alloying in the tapping process; Vanadium and titanium are block Ti-63wt%Si-10wt%Fe and the adding of V-25wt%Fe master alloy form of 15mm through granularity; Molten steel behind the deoxidation alloying send refining of LF stove and trimming, and the gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1230 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be rolled 830 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 6
(1) be raw material production HRB500 reinforcing bar with the slag steel, become crude steel liquid through measures such as slag making, oxygen blast through electrosmelting, crude steel liquid contains [C] 0.15%, [P] 0.027%, [S] 0.063%, [N] 62ppm, a [o] 55ppm; 1681 ℃ of temperature; Deoxidation alloying is carried out in tapping in the tapping process then, and titanium adds through Ti-35wt%Si-10wt%Fe cored-wire form respectively; Content of vanadium is a residual quantity in the slag steel; Molten steel behind the deoxidation alloying send refining of LF stove and trimming, and the gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1250 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1050 ℃, be rolled 850 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 7
(1) be raw material production HRB500 reinforcing bar with steel scrap and scrap iron; Become crude steel liquid through measures such as slag making, oxygen blast through converter smelting; Crude steel liquid contains [C] 0.13%, [P] 0.020%, [S] 0.093%, [N] 60ppm, a [o] 65ppm, 1685 ℃ of temperature, tapping then; Carry out deoxidation alloying in the tapping process; Vanadium and titanium are that the block Ti-40wt%Si-20wt%Fe of 50mm and the molten steel behind the V-25wt%Fe master alloy form adding deoxidation alloying send refining of RH stove and trimming through granularity respectively, and the gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1150 ℃ of insulations 2 hours.
(3) with above-mentioned heating strand air cooling or water-cooled to 1020 ℃, be rolled 800 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Embodiment 8
(1) with blast-melted is raw material production HRB500 reinforcing bar; Become crude steel liquid through measures such as slag making, oxygen blast through converter smelting; Crude steel liquid contains [C] 0.15%, [P] 0.016%, [S] 0.085%, [N] 55ppm, a [o] 63ppm, and 1678 ℃ of temperature are carried out deoxidation alloying in the tapping process; Vanadium and titanium add through Ti-35wt%Fe and V-25wt%Fe cored-wire form respectively; Molten steel behind the deoxidation alloying send refining of LF stove and trimming, and the gained molten steel send the billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) with above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be rolled 820 ℃ of finishing temperatures then.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property for preparing sees table 2 for details.
Table 1 embodiment of the invention reinforcing bar chemical ingredients (by weight, %)
The reinforcement property of table 2 embodiment of the invention
| Embodiment | Bar gauge/mm | Ys/MPa | Tensile strength/MPa | Uniform elongation/% | Unit elongation/% | Strong flexor ratio |
| 1 | φ30 | 455 | 625 | 14.0 | 26.3 | 1.37 |
| 2 | φ20 | 440 | 630 | 14.8 | 25.4 | 1.43 |
| 3 | φ35 | 430 | 625 | 15.0 | 26.2 | 1.45 |
| 4 | φ30 | 445 | 640 | 14.5 | 26.0 | 1.44 |
| 5 | φ25 | 535 | 685 | 14.5 | 25.9 | 1.28 |
| 6 | φ30 | 555 | 710 | 14.6 | 25.8 | 1.28 |
| 7 | φ15 | 565 | 735 | 15.0 | 25.7 | 1.30 |
| 8 | φ35 | 575 | 740 | 14.5 | 27.3 | 1.29 |
The compound transmission electron microscope photo of separating out of reinforcing bar Ti, the V that the present invention provides embodiment three to prepare, visible from photo, separated out in the steel below a large amount of 20nm (Ti, V) the C second phase particle plays significant strengthening effect to reinforcing bar.Can know from embodiment and photo; The present invention utilizes vanadium titanium-combined microalloying (promptly substituting part of V with Ti); Replace mutually containing the V second phase reinforcing steel bar to contain Ti second, and give full play to Si promote to contain Ti with contain V second mutually separate out mechanical propertys such as the ys of raising steel and tensile strength under the condition of the ductility that does not change steel; Production cost is low, and product satisfies the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Claims (10)
1. vanadium titanium-combined microalloying reinforcing bar; The chemical ingredients that it is characterized in that steel is by weight: C:0.16～0.25%, Si:0.20～0.80%, Mn:1.20～1.50%, Ti:0.001～0.12%, V:0.001～0.10%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
2. vanadium titanium-combined microalloying reinforcing bar according to claim 1; The chemical ingredients that it is characterized in that steel is by weight: C:0.22～0.25%, Si:0.50～0.80%, Mn:1.30～1.50%, Ti:0.05～0.12%, V:0.010～0.050%, N≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and unavoidable impurities.
3. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 1 and 2 is characterized in that comprising the steps:
A, steelmaking feed is smelted into crude steel liquid, deoxidation and alloying are carried out in tapping in the tapping process;
Molten steel after b, the tapping is sent into refining furnace and is carried out refining and trimming, casts after making it satisfy the requirement of reinforcing bar composition, obtains rolling reinforcing bar and uses steel billet;
C, rolling reinforcing bar is heated to 1100～1300 ℃ with steel billet is incubated 30～150 minutes again, be rolled afterwards, finish rollingly in the time of between 750～950 ℃, rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature;
Wherein, carry out the alloying of vanadium and titanium in tapping process and after the deoxidation or in refining process.
4. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 3; It is characterized in that: among the step c; Rolling reinforcing bar is heated to 1150～1250 ℃ with steel billet is incubated 55～125 minutes again, be cooled to 1000～1050 ℃ afterwards and be rolled, finish rolling in the time of between 800～860 ℃; Rolling reinforcing bar air cooling makes vanadium titanium-combined microalloying reinforcing bar to room temperature.
5. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 3 is characterized in that: in the alloying process, at least a in ferrotianium, ferrosilicon-titanium alloy, metal titanium or the titaniferous cored-wire adopted in the adding of titanium elements.
6. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 5; It is characterized in that: in the alloying process; The ferrosilicon-titanium alloy is adopted in the adding of titanium elements, and said ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
7. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 3 is characterized in that: in the alloying process, the adding of v element is adopted block vanadium iron and/or is contained the vanadium cored-wire.
8. according to the preparation method of each described vanadium titanium-combined microalloying reinforcing bar in the claim 3 to 7; It is characterized in that: among the step a; It is 1600～1700 ℃ crude steel liquid that steelmaking feed is smelted into temperature, and said crude steel liquid contains [C]≤0.30%, [P]≤0.045%, [S]≤0.10% by weight.
9. according to the preparation method of each described vanadium titanium-combined microalloying reinforcing bar in the claim 3 to 7, it is characterized in that: among the step a, the equipment of steelmaking feed being smelted into crude steel liquid is electric furnace, converter, induction furnace or open hearth.
10. according to the preparation method of each described vanadium titanium-combined microalloying reinforcing bar in the claim 3 to 7, it is characterized in that: among the step b, said refining furnace is LF, RH, VD or VOD stove.
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| CN201210215588.3A CN102703813B (en) | 2012-06-27 | 2012-06-27 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
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| CN102703813B CN102703813B (en) | 2014-01-15 |
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| CN103924154A (en) * | 2013-01-14 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel plate |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN104611628A (en) * | 2014-12-13 | 2015-05-13 | 广西科技大学 | High strength thick steel bar formula |
| CN105400927A (en) * | 2015-12-24 | 2016-03-16 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology |
| CN107385342A (en) * | 2017-08-02 | 2017-11-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of large-specification high-intensity steel rod and its manufacturing process |
| CN107447164A (en) * | 2017-07-15 | 2017-12-08 | 山西建龙实业有限公司 | A kind of anti-seismic steel bar and its production technology |
| CN107955902A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its production method are built containing V, Nb, Ti, Cr microalloy |
| CN107955912A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its LF stove production methods are built containing V, Ti microalloy |
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| CN109355460A (en) * | 2018-12-07 | 2019-02-19 | 董新安 | A kind of titaniferous composite alloy reinforcing core-spun yarn and its application in HRB400E screw-thread steel |
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| CN110791704A (en) * | 2019-10-16 | 2020-02-14 | 邯郸钢铁集团有限责任公司 | 400 MPa-grade vanadium-titanium composite microalloyed disc screw and production method thereof |
| CN110846568A (en) * | 2019-10-16 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | 400 MPa-level straight reinforcing steel bar and production method thereof |
| CN111172459A (en) * | 2020-01-19 | 2020-05-19 | 江苏省沙钢钢铁研究院有限公司 | HRB600E vanadium-titanium microalloyed high-strength anti-seismic hot-rolled steel bar |
| CN112593138A (en) * | 2020-12-10 | 2021-04-02 | 四川德胜集团钒钛有限公司 | Production process of high-strength vanadium-titanium steel bar |
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| CN114293093A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
| CN114293096A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
| JP2022534102A (en) * | 2019-05-23 | 2022-07-27 | インスティテュート オブ リサーチ オブ アイロン アンド スティール，ジィァンスー プロビンス／シャー－スティール カンパニー リミテッド | High-strength reinforcing bar and its manufacturing method |
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| CN101423915A (en) * | 2008-12-11 | 2009-05-06 | 中国钢研科技集团公司 | Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same |
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| CN103924154A (en) * | 2013-01-14 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel plate |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN104611628A (en) * | 2014-12-13 | 2015-05-13 | 广西科技大学 | High strength thick steel bar formula |
| CN105400927A (en) * | 2015-12-24 | 2016-03-16 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology |
| CN105400927B (en) * | 2015-12-24 | 2017-11-21 | 马鞍山中科冶金材料科技有限公司 | A kind of multielement nitro-alloy core-spun yarn and its application and methods for using them in HRB400 steel grade strengthening treatment process |
| CN107447164A (en) * | 2017-07-15 | 2017-12-08 | 山西建龙实业有限公司 | A kind of anti-seismic steel bar and its production technology |
| CN107385342A (en) * | 2017-08-02 | 2017-11-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of large-specification high-intensity steel rod and its manufacturing process |
| CN107955902A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its production method are built containing V, Nb, Ti, Cr microalloy |
| CN107955912A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its LF stove production methods are built containing V, Ti microalloy |
| CN107974618A (en) * | 2017-11-30 | 2018-05-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Ti microalloy |
| CN109355460A (en) * | 2018-12-07 | 2019-02-19 | 董新安 | A kind of titaniferous composite alloy reinforcing core-spun yarn and its application in HRB400E screw-thread steel |
| CN109609846A (en) * | 2018-12-18 | 2019-04-12 | 邯郸钢铁集团有限责任公司 | 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method |
| JP2022534102A (en) * | 2019-05-23 | 2022-07-27 | インスティテュート オブ リサーチ オブ アイロン アンド スティール，ジィァンスー プロビンス／シャー－スティール カンパニー リミテッド | High-strength reinforcing bar and its manufacturing method |
| JP7348310B2 (en) | 2019-05-23 | 2023-09-20 | インスティテュート オブ リサーチ オブ アイロン アンド スティール，ジィァンスー プロビンス／シャー－スティール カンパニー リミテッド | High-strength reinforcing bars and their manufacturing method |
| CN110512046A (en) * | 2019-10-08 | 2019-11-29 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of low-cost manufacture method of screw-thread steel |
| CN110512046B (en) * | 2019-10-08 | 2021-08-10 | 宝武集团鄂城钢铁有限公司 | Low-cost manufacturing method of deformed steel bar |
| CN110846568A (en) * | 2019-10-16 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | 400 MPa-level straight reinforcing steel bar and production method thereof |
| CN110791704A (en) * | 2019-10-16 | 2020-02-14 | 邯郸钢铁集团有限责任公司 | 400 MPa-grade vanadium-titanium composite microalloyed disc screw and production method thereof |
| CN111172459A (en) * | 2020-01-19 | 2020-05-19 | 江苏省沙钢钢铁研究院有限公司 | HRB600E vanadium-titanium microalloyed high-strength anti-seismic hot-rolled steel bar |
| CN112593138A (en) * | 2020-12-10 | 2021-04-02 | 四川德胜集团钒钛有限公司 | Production process of high-strength vanadium-titanium steel bar |
| CN112692053A (en) * | 2020-12-10 | 2021-04-23 | 四川德胜集团钒钛有限公司 | Steel rolling process of vanadium-titanium steel bar |
| CN113512683A (en) * | 2021-07-16 | 2021-10-19 | 新疆八一钢铁股份有限公司 | Low-carbon consumption preparation method of high-strength anti-seismic steel bar |
| CN114293093A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
| CN114293096A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
| CN115747663A (en) * | 2022-12-05 | 2023-03-07 | 中交第二航务工程局有限公司 | High-toughness easy-to-weld steel bar and production method thereof |
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