CN102703813B - 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
- Publication number
- CN102703813B CN102703813B CN201210215588.3A CN201210215588A CN102703813B CN 102703813 B CN102703813 B CN 102703813B CN 201210215588 A CN201210215588 A CN 201210215588A CN 102703813 B CN102703813 B CN 102703813B
- Authority
- CN
- China
- Prior art keywords
- reinforcing bar
- steel
- titanium
- vanadium
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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 hot rolling vanadium titanium-combined microalloying reinforcing bar and production method thereof for a kind of Steel Concrete.
Background technology
At present, China is in industrialization 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 high strength, high welding performance to replace regular reinforcement both at home and abroad.In addition, appearance along with China's popularization high strength cast iron Distursement, with the following low strength reinforcing bar of the 335MPa levels such as HRB335, will be eliminated gradually, other hot rolled ribbed steel bar of HRB400 and higher level thereof will be greatly developed, and the national standard " hot-rolled ribbed steel bars for ther reinforcement of concrete " of new revision also will increase HRB600 reinforcing bar.
The production technology of High Strength Steel Bar is mainly taked the measure of microalloying, is that the new and high technology ，Ye Shige steel mill in ferrous metallurgy field produces the main technological route that 500MPa and above rank reinforcing bar adopt at present.The microalloying of steel is mainly used the strengthening effects to steel such as V, Nb, V-N is compound, V-Nb is compound, makes the reinforcing bar under hot-rolled state can obtain the performances such as high strength, high tenacity, high weldability.But vanadium and alloy thereof, niobium and alloy production cost thereof are higher, when having tied up enterprise profit space, also cause the anxiety of vanadium, niobium resource, be 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, in steel scrap scrap iron, slag slag iron, also contains a certain amount of vanadium and titanium.With vanadium, reinforcing bar being carried out to the strengthening of microalloy Carbonitride Precipitation is used widely, the austenite crystal that utilizes micro-titanium to process refinement reinforcing bar is also applied, but utilize vanadium titanium-combined microalloying (with Ti Substitute For Partial V), to replace have not been reported containing V second-phase reinforcing steel bar containing Ti second-phase simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of vanadium titanium-combined microalloying 400MPa level and above high strength cast iron and production method thereof.
The technical solution adopted for the present invention to solve the technical problems is: vanadium titanium-combined microalloying reinforcing bar, the chemical composition 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 inevitable impurity.
Wherein, in above-mentioned reinforcing bar, the chemical composition of 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 inevitable impurity.
Wherein, above-mentioned reinforcing bar, before rolling, is incubated 30～150 minutes again by heating steel billet to 1100～1300 for rolling concrete steel bar ℃, be rolled afterwards, finish rolling to time between 750～950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Further, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, are cooled to afterwards 1000～1050 ℃ and are rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Wherein, prepare in the alloying process of above-mentioned reinforcing bar, adding of titanium elements adopts ferrosilicon-titanium alloy, and described 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, tapping, carries out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, casts after making it meet the requirement of reinforcing bar composition, obtains rolling concrete steel bar steel billet;
C, heating steel billet to 1100～1300 for rolling concrete steel bar ℃ are incubated to 30～150 minutes again, are rolled afterwards, finish rolling to time between 750～950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of vanadium and titanium in refining process.
Steelmaking feed of the present invention comprises the molten iron that common iron ore is smelt, the molten iron that vanadium titano-magnetite is smelt and/or half steel, direct-reduced iron, cupola furnace molten iron, the iron and steel scrap of recovery and/or slag iron and steel.
Described iron and steel scrap can, for steel scrap or the scrap iron of Steel Plant's generation, can be also other steel scraps or scrap iron on sale on the market.Described slag iron and steel refers to steel or the iron of selecting in slag or blast furnace slag.
Wherein, in aforesaid method step c, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, being cooled to afterwards 1000～1050 ℃ is rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Wherein, in aforesaid method alloying process, titanium elements add at least one employing in ferrotianium, ferrosilicon-titanium alloy, metal titanium or titaniferous cored-wire.
Further, in alloying process, adding of titanium elements adopts ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
Wherein, in aforesaid method alloying process, adding of v element adopts block vanadium iron and/or contains vanadium cored-wire.
Wherein, in aforesaid method step a, it is the crude steel liquid of 1600～1700 ℃ that steelmaking feed is smelted into temperature, and described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.10%.
[C] refers to the C being dissolved in molten steel.In like manner, [P], [S] refer to respectively be dissolved in P, the S in molten steel.
Wherein, in 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, in aforesaid method step b, described 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: ferrite+pearlitic structure; Mn content is chosen in 1.20～1.50%, mainly utilizes it to reduce 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 containing Ti and separating out containing V second-phase simultaneously.The effect of Ti of the present invention stops deformation austenite to be grown up except forming larger Ti (CN), also will in rolling and process of cooling, form a large amount of nano levels containing Ti second-phase, and has together separated out strengthening effect containing V second-phase.The present invention strictly controls soaking time and the temperature before hot rolling of steel billet, and finishing temperature, utilize vanadium titanium-combined microalloying (with Ti Substitute For Partial V), to replace containing V second-phase reinforcing steel bar containing Ti second-phase, and give full play to Si promotion containing Ti and separating out containing V second-phase, under the condition of ductility that does not change steel, improve the mechanical propertys such as the yield strength of steel and tensile strength, production cost is low, and product meets the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Accompanying drawing explanation
Fig. 1 is the compound transmission electron microscope photo of separating out of reinforcing bar Ti, V that the embodiment of the present invention three prepares.
Embodiment
Below by embodiment, the present invention is further illustrated.
Vanadium titanium-combined microalloying reinforcing bar, the chemical composition 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 inevitable impurity.
Preferably, in order to make the mechanical property of above-mentioned reinforcing bar better, realize the performance requriements of 500MPa grade high-strength reinforcing bar, in above-mentioned reinforcing bar, the chemical composition of 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 inevitable impurity.
Preferably, in order to make the mechanical property of above-mentioned reinforcing bar better, guarantee that above-mentioned reinforcing bar meets the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar, should strictly control soaking time and the temperature of steel billet, and finishing temperature, therefore, above-mentioned reinforcing bar, before rolling, is incubated 30～150 minutes again by heating steel billet to 1100～1300 for rolling concrete steel bar ℃, be rolled afterwards, finish rolling to time between 750～950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Further, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, are cooled to afterwards 1000～1050 ℃ and are rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Contriver finds, although Si can promote containing Ti and separating out containing V second-phase in the present invention simultaneously, but to fully guarantee that Ti forms a large amount of nano levels containing Ti second-phase in rolling and process of cooling, with together separated out strengthening effect containing V second-phase, thereby improve the mechanical property of reinforcing bar, so need to be by a[o in tapping process] (being oxygen activity) drop to lower level (greatly below 30ppm), and therefore the deoxidation cost in tapping process is higher.The present invention forms a large amount of nano levels containing Ti second-phase in order fully to guarantee Ti in casting, rolling and process of cooling, can meet cost requirement again, preferably adopt the combination that reduces in another way oxygen and titanium, thereby form a large amount of nano levels containing Ti second-phase, in the alloying process of the above-mentioned reinforcing bar of preparation, adding of titanium elements adopts ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.The present invention adopts ferrosilicon-titanium alloy, because of the special combination of its titanium and silicon, has reduced the combination of titanium and oxygen in alloying process, thereby has reduced the requirement to deoxidation, has improved the recovery rate of titanium, has also just reduced alloy addition, has reduced cost.Ferrosilicon-titanium alloy of the present invention comprises block or Powdered ferrosilicon-titanium alloy, also comprises the cored-wire made from 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, tapping, carries out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, casts after making it meet the requirement of reinforcing bar composition, obtains rolling concrete steel bar steel billet;
C, heating steel billet to 1100～1300 for rolling concrete steel bar ℃ are incubated to 30～150 minutes again, are rolled afterwards, finish rolling to time between 750～950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of vanadium and titanium in refining process.
The present invention strictly controls temperature and the soaking time of heating steel billet, and the temperature of finish to gauge, and object is in order to improve the mechanical property of reinforcing bar, makes it meet the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Preferably, in order to make the mechanical property of reinforcing bar better, in aforesaid method step c, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, being cooled to afterwards 1000～1050 ℃ is rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
Preferably, in aforesaid method alloying process, titanium elements add at least one employing in ferrotianium, ferrosilicon-titanium alloy, metal titanium or titaniferous cored-wire.
Further, for cost-saving, in alloying process, adding of titanium elements adopts ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
Preferably, in aforesaid method alloying process, adding of v element adopts block vanadium iron and/or contains vanadium cored-wire.
Preferably, for necessary temperature and member condition is provided to subsequent handling, in aforesaid method step a, it is the crude steel liquid of 1600～1700 ℃ that steelmaking feed is smelted into temperature, and described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.10%.
Wherein, in 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, in aforesaid method step b, described refining furnace is LF, RH, VD or VOD stove.
Below by embodiment, the specific embodiment of the invention is described further, but therefore protection scope of the present invention is not limited among embodiment.
Embodiment 1
(1) take slag iron as raw material production HRB400 reinforcing bar, by slag making, the measures such as oxygen blast become crude steel liquid through electrosmelting, crude steel liquid is containing [C] 0.13%, [P] 0.019%, [S] 0.070%, [N] 67ppm, a[o] 68ppm, 1678 ℃ of temperature, reach specified requirement, then tapping, in tapping process, carry out deoxidation alloying, the block Ti-23wt%Si-26wt%Fe that vanadium and titanium are 25mm by granularity and V-25wt%Fe master alloy form add, molten steel after deoxidation alloying send the refining of LF stove and trimming, gained molten steel send billet continuous casting casting, composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be then rolled 820 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 2
(1) take slag steel as raw material production HRB400 reinforcing bar, by measures such as slag making, oxygen blast, through electrosmelting, become crude steel liquid, composition is containing [C] 0.17%, [P] 0.020%, [S] 0.080%, [N] 63ppm, a[o] 65ppm, temperature reaches 1685 ℃, reach specified requirement, then tapping, in tapping process, carry out deoxidation alloying, titanium adds by Ti-45wt%Si-10wt%Fe cored-wire form respectively, content of vanadium is residual quantity in slag steel, molten steel after deoxidation alloying send the refining of LF stove and trimming, and gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1230 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, be then rolled 850 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 3
(1) take slag steel and slag iron as raw material production HRB400 reinforcing bar, by slag making, the measures such as oxygen blast become crude steel liquid through converter smelting, crude steel liquid is containing [C] 0.16%, [P] 0.016%, [S] 0.073%, [N] 60ppm, a[o] 60ppm, 1682 ℃ of temperature, reach specified requirement, then tapping, in tapping process, carry out deoxidation alloying, the block Ti-57wt%Si-15wt%Fe that vanadium and titanium are 50mm by granularity respectively and V-25wt%Fe master alloy form add the molten steel after deoxidation alloying to send the refining of RH stove and trimming, gained molten steel send billet continuous casting casting, composition is as shown in table 1.
(2) strand is heated to 1180 ℃ of insulations 2 hours.
(3) by above-mentioned heating strand air cooling or water-cooled to 1000 ℃, be then rolled 800 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 4
(1) take blast-melted is raw material production HRB400 reinforcing bar, by measures such as slag making, oxygen blast, through converter smelting, become crude steel liquid, crude steel liquid is containing [C] 0.12%, [P] 0.022%, [S] 0.093%, [N] 65ppm, a[o] 63ppm, 1679 ℃ of temperature, reach specified requirement tapping, in tapping process, carry out deoxidation alloying, vanadium and titanium add by Ti-35wt%Fe and V-25wt%Fe cored-wire form respectively, molten steel after deoxidation alloying send the refining of LF stove and trimming, gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1040 ℃, be then rolled 850 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 5
(1) take slag iron as raw material production HRB500 reinforcing bar, by measures such as slag making, oxygen blast, through electrosmelting, become crude steel liquid, composition and temperature are tapped after reaching specified requirement, in tapping process, carry out deoxidation alloying, the block Ti-63wt%Si-10wt%Fe that vanadium and titanium are 15mm by granularity and V-25wt%Fe master alloy form add, molten steel after deoxidation alloying send the refining of LF stove and trimming, and gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1230 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be then rolled 830 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 6
(1) take slag steel as raw material production HRB500 reinforcing bar, by measures such as slag making, oxygen blast, through electrosmelting, become crude steel liquid, crude steel liquid is containing [C] 0.15%, [P] 0.027%, [S] 0.063%, [N] 62ppm, a[o] 55ppm, 1681 ℃ of temperature, then tapping, in tapping process, carry out deoxidation alloying, titanium adds by Ti-35wt%Si-10wt%Fe cored-wire form respectively, content of vanadium is residual quantity in slag steel, molten steel after deoxidation alloying send the refining of LF stove and trimming, gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1250 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, be then rolled 850 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 7
(1) take steel scrap and scrap iron as raw material production HRB500 reinforcing bar, by measures such as slag making, oxygen blast, through converter smelting, become crude steel liquid, crude steel liquid is containing [C] 0.13%, [P] 0.020%, [S] 0.093%, [N] 60ppm, a[o] 65ppm, 1685 ℃ of temperature, then tapping, in tapping process, carry out deoxidation alloying, the block Ti-40wt%Si-20wt%Fe that vanadium and titanium are 50mm by granularity respectively and V-25wt%Fe master alloy form add the molten steel after deoxidation alloying to send the refining of RH stove and trimming, gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1150 ℃ of insulations 2 hours.
(3) by above-mentioned heating strand air cooling or water-cooled to 1020 ℃, be then rolled 800 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Embodiment 8
(1) take blast-melted is raw material production HRB500 reinforcing bar, by measures such as slag making, oxygen blast, through converter smelting, become crude steel liquid, crude steel liquid is containing [C] 0.15%, [P] 0.016%, [S] 0.085%, [N] 55ppm, a[o] 63ppm, 1678 ℃ of temperature, in tapping process, carry out deoxidation alloying, vanadium and titanium add by Ti-35wt%Fe and V-25wt%Fe cored-wire form respectively, molten steel after deoxidation alloying send the refining of LF stove and trimming, gained molten steel send billet continuous casting casting, and composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1 hour.
(3) by above-mentioned heating strand air cooling or water-cooled to 1030 ℃, be then rolled 820 ℃ of finishing temperatures.
(4) hot-rolled reinforced bar air cooling is to room temperature.
The reinforcement property preparing refers to table 2.
Table 1 embodiment of the present invention reinforcing bar chemical composition (by weight, %)
The reinforcement property of table 2 embodiment of the present invention
| Embodiment | Bar gauge/mm | Yield strength/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 invention provides the compound transmission electron microscope photo of separating out of reinforcing bar Ti, V that embodiment tri-prepares, from photo, in steel, separated out (Ti, V) C second phase particles below a large amount of 20nm, reinforcing bar is played to significant strengthening effect.From embodiment and photo, the present invention utilizes vanadium titanium-combined microalloying (with Ti Substitute For Partial V), to replace containing V second-phase reinforcing steel bar containing Ti second-phase, and give full play to Si promotion containing Ti and separating out containing V second-phase, under the condition of ductility that does not change steel, improve the mechanical propertys such as the yield strength of steel and tensile strength, production cost is low, and product meets the performance requriements of 400MPa or 500MPa grade high-strength reinforcing bar.
Claims (9)
1. vanadium titanium-combined microalloying reinforcing bar, the chemical composition 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%, and all the other are Fe and inevitable impurity; Reinforcing bar is before rolling, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, are cooled to afterwards 1000～1050 ℃ and are rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar.
2. vanadium titanium-combined microalloying reinforcing bar according to claim 1, the chemical composition 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 inevitable impurity.
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, tapping, carries out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, casts after making it meet the requirement of reinforcing bar composition, obtains rolling concrete steel bar steel billet;
C, heating steel billet to 1150～1250 for rolling concrete steel bar ℃ are incubated to 55～125 minutes again, being cooled to afterwards 1000～1050 ℃ is rolled, finish rolling to time between 800～860 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes vanadium titanium-combined microalloying reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of vanadium and titanium in refining process.
4. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 3, is characterized in that: in alloying process, titanium elements add at least one employing in ferrotianium, ferrosilicon-titanium alloy, metal titanium or titaniferous cored-wire.
5. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 4, it is characterized in that: in alloying process, adding of titanium elements adopts ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20～70%, Si:10～45%, Fe≤15% by weight.
6. the preparation method of vanadium titanium-combined microalloying reinforcing bar according to claim 3, is characterized in that: in alloying process, adding of v element adopts block vanadium iron and/or contain vanadium cored-wire.
7. according to the preparation method of the vanadium titanium-combined microalloying reinforcing bar described in any one in claim 3 to 6, it is characterized in that: in step a, it is the crude steel liquid of 1600～1700 ℃ that steelmaking feed is smelted into temperature, and described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.10%.
8. according to the preparation method of the vanadium titanium-combined microalloying reinforcing bar described in any one in claim 3 to 6, it is characterized in that: in step a, the equipment of steelmaking feed being smelted into crude steel liquid is electric furnace, converter, induction furnace or open hearth.
9. according to the preparation method of the vanadium titanium-combined microalloying reinforcing bar described in any one in claim 3 to 6, it is characterized in that: in step b, described refining furnace is LF, RH, VD or VOD stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210215588.3A CN102703813B (en) | 2012-06-27 | 2012-06-27 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210215588.3A CN102703813B (en) | 2012-06-27 | 2012-06-27 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102703813A CN102703813A (en) | 2012-10-03 |
| CN102703813B true CN102703813B (en) | 2014-01-15 |
Family
ID=46896857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210215588.3A Active CN102703813B (en) | 2012-06-27 | 2012-06-27 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102703813B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104611628A (en) * | 2014-12-13 | 2015-05-13 | 广西科技大学 | High strength thick steel bar formula |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| 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 |
| 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 |
| 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 |
| 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 |
| CN109355460B (en) * | 2018-12-07 | 2020-10-27 | 董新安 | Titanium-containing composite alloy reinforced cored wire and application thereof in HRB400E deformed steel bar |
| 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 |
| CN110129675B (en) * | 2019-05-23 | 2020-08-28 | 江苏省沙钢钢铁研究院有限公司 | High-strength steel bar and production method thereof |
| 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 |
| 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 |
| CN112692053B (en) * | 2020-12-10 | 2023-03-24 | 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 |
| CN114293093B (en) * | 2021-11-17 | 2022-12-23 | 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 |
| CN114293096B (en) * | 2021-11-17 | 2023-04-28 | 攀钢集团攀枝花钢铁研究院有限公司 | 500 MPa-level vanadium-titanium microalloyed 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007316A (en) * | 2007-01-24 | 2007-08-01 | 广州钢铁企业集团有限公司 | Method for producing niobium-contained HRB400 grade reinforcing steel |
| 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 |
-
2012
- 2012-06-27 CN CN201210215588.3A patent/CN102703813B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007316A (en) * | 2007-01-24 | 2007-08-01 | 广州钢铁企业集团有限公司 | Method for producing niobium-contained HRB400 grade reinforcing steel |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102703813A (en) | 2012-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703813B (en) | Vanadium and titanium compound microalloyed steel bar and production method thereof | |
| CN102703811B (en) | Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof | |
| CN102703812B (en) | Titanium microalloyed 500-MPa high-strength steel bar and production method thereof | |
| CN111455262B (en) | Ultrafine-grain high-toughness 600 MPa-level anti-seismic reinforcing steel bar and preparation method thereof | |
| CN111004980B (en) | Vanadium-chromium microalloyed large-size 600MPa ultrafine-grain high-toughness corrosion-resistant anti-seismic steel bar and preparation method thereof | |
| CN110042303B (en) | 400 MPa-level fine-grain hot-rolled steel bar and production process thereof | |
| CN113061805B (en) | 600 MPa-grade corrosion-resistant rare earth reinforcing steel bar and production method thereof | |
| CN102634730B (en) | Steel wire rod for 1860MPa-level bridge cable galvanized steel wire and manufacturing method thereof | |
| CN103898408B (en) | A kind of 700MPa level Twisted Steel and production method thereof | |
| CN103160729B (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN105925899B (en) | A kind of quenched and tempered state X52 hydrogen sulfide corrosion resistant seamless line pipes and preparation method thereof | |
| CN109252106A (en) | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar bar and its production method | |
| CN104593669A (en) | Steel for rebar and production method thereof | |
| CN101654760B (en) | Unalloyed structural steel S355J2 steel plate and production method thereof | |
| CN102796962A (en) | Niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production thereof | |
| CN103981446B (en) | A kind of bainite type 700MPa level Twisted Steel and production method thereof | |
| CN102424933A (en) | Hot-rolled high-strength strip steel and manufacturing method thereof | |
| CN109161671B (en) | High-strength EH36 steel plate for high heat input welding and manufacturing method thereof | |
| CN110438413B (en) | Production process of vanadium-containing steel bar | |
| CN111945074A (en) | 635 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof | |
| CN109252105A (en) | The 500MPa grades of high yield ratio anti-seismic steel bar bars of microalloy containing V and its production method | |
| CN103255342A (en) | 600Mpa-grade high-strength hot continuous rolling structural steel and manufacturing method thereof | |
| CN107955919A (en) | Steel bar and its LF stove production methods are built containing V, Nb microalloy | |
| CN104131238B (en) | High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof | |
| WO2022099680A1 (en) | Converter and continuously-cast small billet-based production method for npr rock bolt or anchor cable novel material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |