CN102703812B - Titanium microalloyed 500-MPa high-strength steel bar and production method thereof - Google Patents

Titanium microalloyed 500-MPa high-strength steel bar and production method thereof Download PDF

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CN102703812B
CN102703812B CN 201210215570 CN201210215570A CN102703812B CN 102703812 B CN102703812 B CN 102703812B CN 201210215570 CN201210215570 CN 201210215570 CN 201210215570 A CN201210215570 A CN 201210215570A CN 102703812 B CN102703812 B CN 102703812B
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steel
reinforcing bar
titanium
alloyedization
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CN102703812A (en
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敖进清
雍岐龙
许立志
杨勇
汪波
孙新军
李昭东
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Panzhihua Gangcheng Group Co Ltd
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Abstract

The invention discloses a 500-MPa high-strength steel bar for reinforced concrete and a production method thereof, belonging to the technical field of microalloying in ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.18-0.25% of C, 0.20-0.80% of Si, 1.20-1.50% of Mn, 0.06-0.12% of Ti, at most 0.01% of N, at most 0.045% of S, at most 0.045% of P, and the balance of Fe and inevitable impurities. The preparation method of the steel bar comprises the following steps: a. crude smelting, tapping, deoxidizing and alloying; b. refining and composition fine adjustment, and casting after satisfying the steel bar composition requirement; and c. hot rolling; wherein the titanium is alloyed in the tapping process after deoxidizing or in the refining process. By using the principle that the titanium in steel reinforces the precipitation, the invention enhances the mechanical properties of the steel, and satisfies the performance requirements for 500-MPa high-strength steel bars and even anti-seismic steel bars.

Description

Titanium micro-alloyedization 500MPa grade high-strength reinforcing bar and production method thereof
Technical field
The invention belongs to ferrous metallurgy micro-alloying technology field, be specifically related to hot rolling 400MPa grade high-strength 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 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, is also the main technological route that each steel mill produces 500MPa and the employing of above rank reinforcing bar at present.The microalloying of steel is mainly used V, Nb, V-N is compound, V-Nb is compound etc. to the strengthening effect of steel, 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, also cause the anxiety of vanadium, niobium resource when having tied up the enterprise profit space, be unfavorable for the production of 500MPa high strength cast iron and anti-seismic steel bar and apply.
The Panxi Diqu vanadium and titanium resources that is richly stored with, 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 the refinement reinforcing bar also is applied, but with titanium, steel is carried out to the strengthening of microalloy Carbonitride Precipitation, have not been reported.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of titanium micro-alloyedization 500MPa grade high-strength reinforcing bar and production method thereof.
The technical solution adopted for the present invention to solve the technical problems is: titanium micro-alloyedization 500MPa grade high-strength reinforcing bar, the chemical composition of steel is by weight: C:0.18~0.25%, Si:0.20~0.80%, Mn:1.20~1.50%, Ti:0.06~0.12%, 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:0.18~0.24%, Si:0.35~0.70%, Mn:1.35~1.50%, Ti:0.07~0.12%, 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 for rolling concrete steel bar~1250 ℃, be rolled afterwards, finish rolling to time between 750~950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
Further, heating steel billet to 1150 for rolling concrete steel bar~1230 ℃ are incubated to 55~125 minutes again, are cooled to afterwards 1000~1080 ℃ and are rolled, finish rolling to time between 800~880 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
Wherein, prepare in the alloying process of above-mentioned reinforcing bar, adding of titanium elements adopts the 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 titanium micro-alloyedization 500MPa grade high-strength reinforcing bar, comprise the steps:
A, steelmaking feed is smelted into to crude steel liquid, tapping, carry out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, is cast after making it meet the requirement of reinforcing bar composition, obtains the rolling concrete steel bar steel billet;
C, heating steel billet to 1100 for rolling concrete steel bar~1250 ℃ 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 titanium micro-alloyedization 500MPa grade high-strength reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of 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 for rolling concrete steel bar~1230 ℃ are incubated to 55~125 minutes again, being cooled to afterwards 1000~1080 ℃ is rolled, finish rolling to time between 800~880 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
Wherein, in the 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 the ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20~70%, Si:10~45%, Fe≤15% by weight.
Wherein, in aforesaid method step a, steelmaking feed is smelted into to the crude steel liquid that temperature is 1600~1700 ℃, described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.12%.
[C] refers to the C be dissolved in molten steel, and 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 to 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: the present invention adopts titanium to carry out microalloying, titanium micro-alloyed amount is 0.04~0.12%, different from the micro-processing steel of general Ti (titanium content is generally all lower than 0.02%), in the present invention, the effect of Ti stops the 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 the Ti second-phase, improve the intensity of reinforcing bar by precipitation strength.C content is chosen in 0.18~0.25% 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 selected in 0.20~0.80% has higher solid solution strengthening effect, can promote separating out containing the Ti second-phase simultaneously.The present invention strictly controls soaking time and the temperature before hot rolling of steel billet, and finishing temperature, utilize titanium to separate out the principle of strengthening in steel, and give full play to Si and promote separating out containing the Ti second-phase, the mechanical propertys such as the yield strength of raising steel and tensile strength under the condition of the ductility that does not change steel, production cost is low, and product meets the even performance requriements of anti-seismic steel bar of 500MPa grade high-strength reinforcing bar.
The accompanying drawing explanation
Fig. 1 is that the reinforcing bar Ti that the embodiment of the present invention three prepares separates out transmission electron microscope photo.
Embodiment
Below by embodiment, the present invention is further illustrated.
Titanium micro-alloyedization 500MPa grade high-strength reinforcing bar, the chemical composition of steel is by weight: C:0.18~0.25%, Si:0.20~0.80%, Mn:1.20~1.50%, Ti:0.06~0.12%, N :≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and inevitable impurity.
Preferably, in order to make mechanical property better, in above-mentioned reinforcing bar, the chemical composition of steel is by weight: C:0.18~0.24%, Si:0.35~0.70%, Mn:1.35~1.50%, Ti:0.07~0.12%, N :≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and inevitable impurity.
Preferably, better for the mechanical property that makes above-mentioned reinforcing bar, guarantee that above-mentioned reinforcing bar meets the performance requriements of 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 for rolling concrete steel bar~1250 ℃, be rolled afterwards, finish rolling to time between 750~950 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
Further, heating steel billet to 1150 for rolling concrete steel bar~1230 ℃ are incubated to 55~125 minutes again, are cooled to afterwards 1000~1080 ℃ and are rolled, finish rolling to time between 800~880 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
The contriver finds, although in the present invention, Si can promote separating out containing the Ti second-phase, but to fully guarantee that Ti forms a large amount of nano levels and plays the precipitation strength effect containing the Ti second-phase in rolling and process of cooling, thereby improve the mechanical property of reinforcing bar, 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 the Ti second-phase in order fully to guarantee Ti in casting, rolling and process of cooling, can meet cost requirement again, preferably adopt another kind of mode to reduce the combination of oxygen and titanium, thereby form a large amount of nano levels containing the Ti second-phase, in the alloying process of the above-mentioned reinforcing bar of preparation, adding of titanium elements adopts the ferrosilicon-titanium alloy, and described 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, 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 reduced alloy addition, has reduced cost.Ferrosilicon-titanium alloy of the present invention comprises the ferrosilicon-titanium alloy of block and powdery, also comprises the cored-wire made from the Powdered Titanium ferro-silicon.
The preparation method of above-mentioned titanium micro-alloyedization 500MPa grade high-strength reinforcing bar, comprise the steps:
A, steelmaking feed is smelted into to crude steel liquid, tapping, carry out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, is cast after making it meet the requirement of reinforcing bar composition, obtains the rolling concrete steel bar steel billet;
C, heating steel billet to 1100 for rolling concrete steel bar~1250 ℃ 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 titanium micro-alloyedization 500MPa grade high-strength reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of 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 purpose is in order to improve the mechanical property of reinforcing bar, makes it meet the performance requriements of 500MPa grade high-strength reinforcing bar.
Preferably, for the mechanical property that makes reinforcing bar better, in aforesaid method step c, heating steel billet to 1150 for rolling concrete steel bar~1230 ℃ are incubated to 55~125 minutes again, being cooled to afterwards 1000~1080 ℃ is rolled, finish rolling to time between 800~880 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
Preferably, in the 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 the ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20~70%, Si:10~45%, Fe≤15% by weight.
Preferably, for necessary temperature and member condition is provided to subsequent handling, in aforesaid method step a, steelmaking feed is smelted into to the crude steel liquid that temperature is 1600~1700 ℃, described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.12%.
Wherein, in aforesaid method step a, the equipment of steelmaking feed being smelted into to 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 HRB500 reinforcing bar, become crude steel liquid by measures such as slag making, oxygen blast through electrosmelting, contain [C] 0.20%, [P] 0.022%, [S] 0.093%, [N] 68ppm, a[o in crude steel liquid] 70ppm, 1693 ℃ of temperature, then tapping, carry out deoxidation alloying in tapping process, the block Ti-25wt%Si-10wt%Fe master alloy form that titanium is 25mm by granularity adds, molten steel after deoxidation alloying send the 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) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, then be rolled 850 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Embodiment 2
(1) take the slag steel as raw material production HRB500, become crude steel liquid by measures such as slag making, oxygen blast through electrosmelting, crude steel liquid is containing [C] 0.21%, [P] 0.022%, [S] 0.067%, [N] 60ppm, a[o] 55ppm, 1683 ℃ of temperature, composition and temperature reach specified requirement, then tapping, carry out deoxidation alloying in tapping process, titanium adds by Ti-45wt%Si-10wt%Fe cored-wire form, molten steel after deoxidation alloying send the 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) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, then be rolled 850 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Embodiment 3
(1) take slag steel and slag iron compound is raw material production HRB500, by slag making, the measures such as oxygen blast become crude steel liquid through electrosmelting, crude steel liquid is containing [C] 0.17%, [P] 0.026%, [S] 0.112%, [N] 65ppm, a[o] 57ppm, temperature is 1685 ℃, composition and temperature reach specified requirement, then tapping, carry out deoxidation alloying in tapping process, the block Ti-55wt%Si-15wt%Fe master alloy form that titanium is 15mm by titanium by granularity adds, molten steel after deoxidation alloying send the refining of LF stove and trimming, the gained molten steel send the billet continuous casting casting, composition is as shown in table 1.
(2) strand is heated to 1200 ℃ of insulations 1.5 hours.
(3) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, then be rolled 850 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Embodiment 4
(1) take steel scrap and scrap iron as raw material production HRB500, become crude steel liquid by measures such as slag making, oxygen blast through converter smelting, crude steel liquid is containing [C] 0.18%, [P] 0.027%, [S] 0.079%, [N] 62ppm, a[o] 67ppm, 1688 ℃ of temperature, composition and temperature reach specified requirement, then tapping, carry out deoxidation alloying in tapping process, the block Ti-63wt%Si-15wt%Fe master alloy form that titanium is 50mm by granularity adds the molten steel after deoxidation alloying to send the 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 1150 ℃ of insulations 2 hours.
(3) by above-mentioned heating strand air cooling or water-cooled to 1020 ℃, then be rolled 830 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Embodiment 5
(1) take blast-melted is raw material production HRB500, become crude steel liquid by measures such as slag making, oxygen blast through converter smelting, containing [C] 0.17%, [P] 0.023%, [S] 0.099%, [N] 65ppm, a[o] 63ppm, 1685 ℃ of temperature, composition and temperature reach specified requirement, then tapping, carry out deoxidation alloying in tapping process, titanium adds by Ti-35wt%Fe cored-wire form, molten steel after deoxidation alloying send the 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) by above-mentioned heating strand air cooling or water-cooled to 1080 ℃, then be rolled 850 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Embodiment 6
(1) take blast-melted is raw material production HRB500E, become crude steel liquid by measures such as slag making, oxygen blast through electrosmelting, crude steel liquid is containing [C] 0.19%, [P] 0.025%, [S] 0.090%, [N] 67ppm, a[o] 61ppm, 1687 ℃ of temperature, composition and temperature reach specified requirement, then tapping, carry out deoxidation alloying in tapping process, the block Ti-35wt%Si-15wt%Fe master alloy form that titanium is 10mm by granularity adds, molten steel after deoxidation alloying send the refining of RH 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) by above-mentioned heating strand air cooling or water-cooled to 1050 ℃, then be rolled 840 ℃ of finishing temperatures.
(4) the hot-rolled reinforced bar air cooling is to room temperature.
Table 1 embodiment of the present invention reinforcing bar chemical composition (by weight, %)
The reinforcement property of table 2 embodiment of the present invention
Figure BDA00001817809900062
Figure BDA00001817809900071
The invention provides the reinforcing bar Ti that embodiment tri-prepares and separate out transmission electron microscope photo, from photo, separate out the TiC second phase particles of taking measurements greatly below 20nm in steel, reinforcing bar is played to significant strengthening effect.The present invention utilizes titanium to play the principle of precipitation strength in steel, improves the mechanical propertys such as the yield strength of steel and tensile strength under the condition of the ductility that does not change steel, and production cost is low, and product meets the performance requriements of 500MPa grade high-strength reinforcing bar.

Claims (6)

1. the preparation method of titanium micro-alloyedization 500MPa grade high-strength reinforcing bar, is characterized in that comprising the steps:
A, steelmaking feed is smelted into to crude steel liquid, tapping, carry out component controlling in tapping process;
Molten steel after b, tapping is sent into refining furnace and is carried out refining and trimming, is cast after making it meet the requirement of reinforcing bar composition, obtains the rolling concrete steel bar steel billet; The chemical composition of steel is by weight: C:0.18~0.25%, Si:0.20~0.80%, Mn:1.20~1.50%, Ti:0.06~0.12%, and N :≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and inevitable impurity;
C, heating steel billet to 1100 for rolling concrete steel bar~1250 ℃ 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 titanium micro-alloyedization 500MPa grade high-strength reinforcing bar;
Wherein, in tapping process and after deoxidation or carry out the alloying of titanium in refining process; In alloying process, adding of titanium elements adopts the ferrosilicon-titanium alloy, and described ferrosilicon-titanium alloy contains Ti:20~70%, Si:10~45%, Fe≤15% by weight.
2. the preparation method of titanium micro-alloyedization 500MPa grade high-strength reinforcing bar according to claim 1, it is characterized in that: the chemical composition of steel is by weight: C:0.18~0.24%, Si:0.35~0.70%, Mn:1.35~1.50%, Ti:0.07~0.12%, N :≤0.01%, S≤0.045%, P≤0.045%, all the other are Fe and inevitable impurity.
3. the preparation method of titanium micro-alloyedization 500MPa grade high-strength reinforcing bar according to claim 1, it is characterized in that: in step c, heating steel billet to 1150 for rolling concrete steel bar~1230 ℃ are incubated to 55~125 minutes again, being cooled to afterwards 1000~1080 ℃ is rolled, finish rolling to time between 800~880 ℃, the reinforcing bar air cooling of rolling, to room temperature, makes titanium micro-alloyedization 500MPa grade high-strength reinforcing bar.
4. according to the preparation method of the described titanium micro-alloyedization 500MPa of any one in claims 1 to 3 grade high-strength reinforcing bar, it is characterized in that: in step a, steelmaking feed is smelted into to the crude steel liquid that temperature is 1600~1700 ℃, and described crude steel liquid is by weight containing [C]≤0.30%, [P]≤0.045%, [S]≤0.12%.
5. according to the preparation method of the described titanium micro-alloyedization 500MPa of any one in claims 1 to 3 grade high-strength reinforcing bar, it is characterized in that: in step a, the equipment of steelmaking feed being smelted into to crude steel liquid is electric furnace, converter, induction furnace or open hearth.
6. according to the preparation method of the described titanium micro-alloyedization 500MPa of any one in claims 1 to 3 grade high-strength reinforcing bar, it is characterized in that: in step b, described refining furnace is LF, RH, VD or VOD stove.
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