CN105088074A - High-strength steel bar and method for controlling minimum reinforcement ratio of concrete plate flexural member through high-strength steel bars - Google Patents
High-strength steel bar and method for controlling minimum reinforcement ratio of concrete plate flexural member through high-strength steel bars Download PDFInfo
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Abstract
The invention discloses a high-strength steel bar. The high-strength steel bar comprises 0.18-0.28% of C, 0.45-0.85% of Si, 1.35-1.65% of Mn, 0.09-0.26% of combined elements of V+Ti+Nb, 0.01-0.06% of Cr, 0.01-0.06% of Ni, 0-0.05% of Cu, 0-0.01% of Mo, 0.025% of P or less, 0.025% of S or less, 0.005-0.015% of N and the balance Fe and unavoidable impurities. The yield strength and tensile strength are improved, the plasticity is not lowered, and the yield strength can reach 600 MPa or more, so that when the high-strength steel bar is applied to a concrete plate flexural member, the minimum reinforcement ratio of the concrete plate flexural member is set as the larger value between 0.15 and 45ft/fy.
Description
Technical field
The present invention relates to a kind of reinforcing bar and production technique thereof, specifically a kind of High Strength Steel Bar and the percentile method of control such as concrete panels flexure member minimum reinforcements thereof.
Background technology
High Strength Steel Bar refer to Steel Concrete with and prestressed reinforced concrete steel, its cross section is circle, is square with fillet sometimes.Comprise plain bar, Ribbed Bar, twisted bar.In prior art, reinforcing bar is by dividing I grade of reinforcing bar (235/370 grade) by mechanical property; II grade of reinforcing bar (335/510 grade); III grade of reinforcing bar (370/570) and Ⅳ-grade steel muscle (540/835).Latter two reinforcing bar is High Strength Steel Bar.
High Strength Steel Bar kind frequent species is as follows:
(1) microalloy hot rolled ribbed steel bar: the hot rolled ribbed steel bar improving yield strength and ultimate strength by adding the alloying elements such as vanadium (V), niobium (NB).By adding the alloying elements such as vanadium (V), niobium (NB), yield strength and ultimate strength, colleague's ductility and the construction adaptability that can significantly improve reinforcing bar can be better.Its trade mark is HRB, and as being labeled as the High Strength Steel Bar of HRB400, HRB500, the yield strength standard value being just represented as microalloying is respectively the hot rolled ribbed steel bar of 400MPA level, 500Mpa level.Owing to increasing microalloy, raw materials cost is higher, and the alloying element reserves such as domestic vanadium (V), niobium (NB) are not enough, and the later stage will rely on import.It is high that secondary melts down cost, and owing to adding alloying element, after melting down, containing a large amount of alloy in molten steel, secondary uses rolling quality unstable.Separation alloy technology is immature, and separation costs is high.
(2) high ductility cold-rolled ribbed bars: the cold rolled reinforcing steel bar with ribs with higher ductility that hot rolling wire rod obtains through cold rolling shaping and tempering heat treatment.High ductility cold-rolled ribbed bars, it is the domestic novel high-strength Ribbed Bar developed in recent years, its production technique adds tempering heat treatment process, have obvious yield-point, intensity and elongation index are all significantly increased and have listed in national sector standard " cold rolled reinforcing steel bar with ribs concrete structure technique code " JGJ95-2011.CRB600H height ductility cold-rolled ribbed bars tensile strength standard value is 600Mpa, yield strength standard value 520Mpa, tensile strength design load 415MPA, percentage of total elongation (uniform elongation)≤5% under maximum, force.This kind of reinforcing bar processability is good, and price is lower, and as the stirrup Constructional Steel Bar in the steel bar stress of plate class A of geometric unitA and Distribution Steel and beam, post, both can reduce amount of reinforcement, and can reduce again cost, Social benefit and economic benefit is all fairly obvious.National housing construction portion in 2012 starts to promote, and start late, various places production capacity has to be increased.
(3) waste heat treatment steel bar: to carry out hardening process during steel rolling and to utilize the waste heat of core to the Surface realization tempering of reinforcing bar, improve reinforced steel bar strength and avoid fragility, the trade mark of waste heat treatment steel bar is RRB.As being labeled as the High Strength Steel Bar of RRB400, the yield strength standard value being just represented as Heat Treatment is the hot rolled ribbed steel bar of 400Mpa level.This kind of reinforcing bar only need be heat-treated in hardening mode in the last process of steel rolling, and its cost is minimum, and intensity can reach the requirement of High Strength Steel Bar, but ductility, weldability and construction adaptability are relatively poor.
(4) fine grain hot-rolled ribbed bar: be carry out hardening process and utilize the waste heat of core to the Surface realization tempering of reinforcing bar, to improve the hot rolled ribbed steel bar that intensity avoids fragility by steel rolling.Steel rolling adopts special control bundle and cooling control technology, is the grain refining of reinforcing bar metallographic structure, intensity raising.This technique can improve intensity and maintain again good ductility, reaches in concrete structure the requirement using High Strength Steel Bar.Its trade mark of close grain reinforcing bar is HRBF, and as being labeled as the High Strength Steel Bar of HRBF400, HRBF500, the yield strength standard value being just represented as close grain is the hot rolled ribbed steel bar of 400MPA level, 500MPA level.This kind of reinforcing bar needs larger equipment investment and higher processing requirement, and the intensity index of reinforcing bar and ductile performance can meet the demands, and weldability is general.
Above existing High Strength Steel Bar yield strength all do not reach 600MPa level and more than.
Summary of the invention
Technical problem to be solved by this invention is, how to balance precipitation strength and the refined crystalline strengthening of V+Ti+Nb composite component, both yield strength and tensile strength can be improved, do not reduce plasticity again, yield strength can reach 600MPa level and more than, when making High Strength Steel Bar for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value.
In order to solve above technical problem, present inventor is found by research, V, Ti, Nb in the composition of steel and other bioelement is reasonably combined, can solve above technical problem.
The technical scheme that the present invention solves above technical problem is:
A kind of High Strength Steel Bar, its chemical composition and weight percent are: C:0.18-0.28%, Si:0.45-0.85%, Mn:1.35-1.65%, V+Ti+Nb composite component: 0.09-0.26%, Cr:0.01-0.06%, Ni:0.01-0.06%, Cu:0-0.05%, Mo:0-0.01%, P≤0.025%, S≤0.025%, N:0.005-0.015%, surplus is Fe and inevitable impurity; V+Ti+Nb composite component is the combination of at least one in Ti and Nb and V; In V+Ti+Nb composite component, the weight percent that V, Ti and Nb account for whole High Strength Steel Bar is respectively: V:0.05-0.25%, Ti:0.01-0.1%, Nb:0.005-0.05%.
The technological process of production of High Strength Steel Bar of the present invention is: converter smelting, LF refining, continuous small-billet casting, rolling bar and cold bed cooling; Wherein, converter smelting, LF refining and continuous small-billet casting are all existing technique, continuous small-billet casting adopts the Technology of Clean Steel and flawless continuous-casting billet, and alloying constituent and nitrogen in steel Gas content control with accurate, the inherence of continuously cast bloom and the continuous cast billet of excellent surface quality; Wherein in rolling bar operation, roll speed is 11.0-18.0m/s, and heating zone temperature is 1100 ± 50 DEG C, and soaking zone temperature is 1200 ± 50 DEG C, and start rolling temperature is 1100 ± 40 DEG C; In cold bed refrigerating work procedure, temperature on cooling table >=960 DEG C.The Controlled Rolling And Controlled Cooling rolling that the present invention adopts, to give full play to the effect of microalloy element, complete the organizational controls of steel, guarantee intensity and plastic property conformance with standard or associated specifications, the yield strength of High Strength Steel Bar of the present invention can reach 600MPa level and more than.
High Strength Steel Bar of the present invention controls the percentile method of such as concrete panels flexure member minimum reinforcements, this bright High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value, wherein f
yfor the tensile strength values of High Strength Steel Bar of the present invention, f
tfor such as concrete panels flexure member axial tensile strength value.
The acting as of each element in composition of steel of the present invention:
Carbon (C): in steel, C forms various carbide in steel, significantly improves the intensity of steel, and the yield strength of reinforcing bar and tensile strength increase with C content and raises, and plasticity reduces, and welding property worsens; In order to balance yield strength, the amiable plasticity of tensile strength of steel, making high-strength steel disk of the present invention have higher yield strength and tensile strength, but not reducing plasticity, therefore control 0.18-0.28%.
Silicon (Si): in steel, Si can be dissolved in ferrite and improve its intensity, when in reinforcing bar, Si content is greater than 0.50%, yield strength and tensile strength increase with Si obvious lifting, plasticity reduces, welding property worsens, and in order to balance yield strength, the amiable plasticity of tensile strength of steel, makes high-strength steel disk of the present invention have higher yield strength and tensile strength, but do not reduce plasticity, therefore control Si:0.45-0.85%.
Manganese (Mn): in steel, Mn can be dissolved in cementite or with solid solution condition and exist, significantly improve the intensity of steel, the yield strength of Twisted Steel and tensile strength increase with Mn content and raise, reduce welding property, in order to balance yield strength, the amiable plasticity of tensile strength of steel, make high-strength steel disk of the present invention have higher yield strength and tensile strength, but do not reduce plasticity, therefore control Mn:1.35-1.65%.
The effect of V+Ti+Nb composite component: the nitrides precipitate of Nb, V, the Ti of the strain induced precipitate in the course of hot rolling of reinforcing bar is on crystal boundary or subgrain boundary and dislocation, stop the motion that austenite rises at crystal grain and dislocation, play pinning effect, inhibit the carrying out of recrystallization process; TiN and Nb (CN) in the hot rolling its Dispersed precipitate in steel has strong restraining effect to growing up of crystallization under control high temperature; The carbide of Nb, V, Ti and nitride have certain solubleness in austenite, in the operation of rolling, these microalloy elements improve austenitic stability, reduce and eutectoid ferrite and pearlitic temperature range occur, make the ferrite and pearlite of formation more tiny.
It is 0.005-0.015% that the present invention controls N content, coordinate the content of V+Ti+Nb composite component, can strengthen and refined crystalline strengthening by Equilibrium Precipitation, both can improve the precipitation motivating force of vanadium carbonitride, the ratio of tiny precipitated phase can be increased again simultaneously, improve yield strength.
The technical scheme that the present invention limits further is:
Aforesaid High Strength Steel Bar, its chemical composition and weight percent are: C:0.18%, Si:0.45%, Mn:1.35%, V:0.19%, Ti:0.02%, Nb:0.015%, Cr:0.01%, Ni:0.01%, P:0.009%, S:0.003%, N:0.005%, surplus is Fe and inevitable impurity.
Aforesaid High Strength Steel Bar, its chemical composition and weight percent are: C:0.26%, Si:0.71%, Mn:1.51%, V:0.24%, Nb:0.009%, Cr:0.025%, Ni:0.03%, Cu:0.02%, Mo:0.01%, P:0.008%, S:0.009%, N:0.009%, surplus is Fe and inevitable impurity.
Aforesaid High Strength Steel Bar, its chemical composition and weight percent are: C:0.28%, Si:0.85%, Mn:1.65%, V:0.14%, Ti:0.08%, Cr:0.05%, Ni:0.05%, Cu:0.05%, Mo:0.008%, P:0.025%, S:0.025%, N:0.012%, surplus is Fe and inevitable impurity.
The invention has the beneficial effects as follows: V, Ti, Nb in the composition of steel and other bioelement reasonably combine by the present invention, both yield strength and tensile strength can be improved, do not reduce plasticity again, yield strength can reach 600MPa level and more than, when this bright High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member can be set as 0.15 and 45f
t/ f
yin higher value, wherein f
yfor the tensile strength values of High Strength Steel Bar of the present invention, f
tfor such as concrete panels flexure member axial tensile strength value.
Embodiment
Embodiment 1
The High Strength Steel Bar of the present embodiment, its chemical composition and weight percent are: C:0.18%, Si:0.45%, Mn:1.35%, V:0.19%, Ti:0.02%, Nb:0.015%, Cr:0.01%, Ni:0.01%, P:0.009%, S:0.003%, N:0.005%, surplus is Fe and inevitable impurity.
The technological process of production of the present embodiment High Strength Steel Bar is: converter smelting, LF refining, continuous small-billet casting, rolling bar and cold bed cooling; Wherein, converter smelting, LF refining and continuous small-billet casting are all existing technique, continuous small-billet casting adopts the Technology of Clean Steel and flawless continuous-casting billet, and alloying constituent and nitrogen in steel Gas content control with accurate, the inherence of continuously cast bloom and the continuous cast billet of excellent surface quality; Wherein in rolling bar operation, roll speed is 11.0m/s, and heating zone temperature is 1100 DEG C, and soaking zone temperature is 1200 DEG C, and start rolling temperature is 1100 DEG C; In cold bed refrigerating work procedure, temperature on cooling table 960 DEG C.The Controlled Rolling And Controlled Cooling rolling that the present invention adopts, to give full play to the effect of microalloy element, completes the organizational controls of steel, guarantees intensity and plastic property conformance with standard or associated specifications.
The High Strength Steel Bar of the present embodiment controls the percentile method of such as concrete panels flexure member minimum reinforcements, this bright High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value, wherein f
yfor the tensile strength values of High Strength Steel Bar of the present invention, f
tfor such as concrete panels flexure member axial tensile strength value.
Embodiment 2
The High Strength Steel Bar of the present embodiment, its chemical composition and weight percent are: C:0.26%, Si:0.71%, Mn:1.51%, V:0.24%, Nb:0.009%, Cr:0.025%, Ni:0.03%, Cu:0.02%, Mo:0.01%, P:0.008%, S:0.009%, N:0.009%, surplus is Fe and inevitable impurity.
The technological process of production of the present embodiment High Strength Steel Bar is: converter smelting, LF refining, continuous small-billet casting, rolling bar and cold bed cooling; Wherein, converter smelting, LF refining and continuous small-billet casting are all existing technique, continuous small-billet casting adopts the Technology of Clean Steel and flawless continuous-casting billet, and alloying constituent and nitrogen in steel Gas content control with accurate, the inherence of continuously cast bloom and the continuous cast billet of excellent surface quality; Wherein in rolling bar operation, roll speed is 15.0m/s, and heating zone temperature is 1050 DEG C, and soaking zone temperature is 1150 DEG C, and start rolling temperature is 1060 DEG C; In cold bed refrigerating work procedure, temperature on cooling table 980 DEG C.The Controlled Rolling And Controlled Cooling rolling that the present invention adopts, to give full play to the effect of microalloy element, completes the organizational controls of steel, guarantees intensity and plastic property conformance with standard or associated specifications.
The High Strength Steel Bar of the present embodiment controls the percentile method of such as concrete panels flexure member minimum reinforcements, this bright High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value, wherein f
yfor the tensile strength values of High Strength Steel Bar of the present invention, f
tfor such as concrete panels flexure member axial tensile strength value.
Embodiment 3
The High Strength Steel Bar of the present embodiment, its chemical composition and weight percent are: C:0.28%, Si:0.85%, Mn:1.65%, V:0.14%, Ti:0.08%, Cr:0.05%, Ni:0.05%, Cu:0.05%, Mo:0.008%, P:0.025%, S:0.025%, N:0.012%, surplus is Fe and inevitable impurity.
The technological process of production of the High Strength Steel Bar of the present embodiment is: converter smelting, LF refining, continuous small-billet casting, rolling bar and cold bed cooling; Wherein, converter smelting, LF refining and continuous small-billet casting are all existing technique, continuous small-billet casting adopts the Technology of Clean Steel and flawless continuous-casting billet, and alloying constituent and nitrogen in steel Gas content control with accurate, the inherence of continuously cast bloom and the continuous cast billet of excellent surface quality; Wherein in rolling bar operation, roll speed is 18.0m/s, and heating zone temperature is 1150 DEG C, and soaking zone temperature is 1250 DEG C, and start rolling temperature is 1140 DEG C; In cold bed refrigerating work procedure, temperature on cooling table 990 DEG C.The Controlled Rolling And Controlled Cooling rolling that the present invention adopts, to give full play to the effect of microalloy element, completes the organizational controls of steel, guarantees intensity and plastic property conformance with standard or associated specifications.
The High Strength Steel Bar of the present embodiment controls the percentile method of such as concrete panels flexure member minimum reinforcements, this bright High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value, wherein f
yfor the tensile strength values of High Strength Steel Bar of the present invention, f
tfor such as concrete panels flexure member axial tensile strength value.
The High Strength Steel Bar performance of embodiment 1-3 is if following table is as shown:
| ReL/Mpa | Rm/Mpa | A/％ | Agt/％ | Rm/ReL | |
| Embodiment 1 | 650 | 819 | 21.6 | 10.6 | 1.26 |
| Embodiment 2 | 633 | 830 | 22.5 | 13 | 1.31 |
| Embodiment 3 | 650 | 819 | 21.6 | 10.6 | 1.26 |
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. a High Strength Steel Bar, is characterized in that: its chemical composition and weight percent are: C:0.18-0.28%, Si:0.45-0.85%, Mn:1.35-1.65%, V+Ti+Nb composite component: 0.09-0.26%, Cr:0.01-0.06%, Ni:0.01-0.06%, Cu:0-0.05%, Mo:0-0.01%, P≤0.025%, S≤0.025%, N:0.005-0.015%, surplus is Fe and inevitable impurity; Described V+Ti+Nb composite component is the combination of at least one in Ti and Nb and V; In described V+Ti+Nb composite component, the weight percent that V, Ti and Nb account for whole High Strength Steel Bar is respectively: V:0.05-0.25%, Ti:0.01-0.1%, Nb:0.005-0.05%.
2. High Strength Steel Bar as claimed in claim 1, is characterized in that: its chemical composition and weight percent are: C:0.18%, Si:0.45%, Mn:1.35%, V:0.19%, Ti:0.02%, Nb:0.015%, Cr:0.01%, Ni:0.01%, P:0.009%, S:0.003%, N:0.005%, surplus is Fe and inevitable impurity.
3. High Strength Steel Bar as claimed in claim 1, is characterized in that: its chemical composition and weight percent are: C:0.26%, Si:0.71%, Mn:1.51%, V:0.24%, Nb:0.009%, Cr:0.025%, Ni:0.03%, Cu:0.02%, Mo:0.01%, P:0.008%, S:0.009%, N:0.009%, surplus is Fe and inevitable impurity.
4. High Strength Steel Bar as claimed in claim 1, is characterized in that: its chemical composition and weight percent are: C:0.28%, Si:0.85%, Mn:1.65%, V:0.14%, Ti:0.08%, Cr:0.05%, Ni:0.05%, Cu:0.05%, Mo:0.008%, P:0.025%, S:0.025%, N:0.015%, surplus is Fe and inevitable impurity.
5. the High Strength Steel Bar as described in claim arbitrary in claim 1-4 controls the percentile method of such as concrete panels flexure member minimum reinforcements, it is characterized in that: described High Strength Steel Bar is used for such as concrete panels flexure member, the minimum reinforcements percentage of described such as concrete panels flexure member is set as 0.15 and 45f
t/ f
yin higher value, described f
yfor the tensile strength values of described High Strength Steel Bar, described f
tfor such as concrete panels flexure member axial tensile strength value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107747048A (en) * | 2017-11-30 | 2018-03-02 | 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, Nb, Ti, Cr microalloy |
| CN109576583A (en) * | 2018-12-18 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method |
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| CN102994883A (en) * | 2012-12-05 | 2013-03-27 | 江苏永钢集团有限公司 | High-strength reinforced bar and production method for same |
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| CN101122152A (en) * | 2007-07-04 | 2008-02-13 | 浙江大学宁波理工学院 | Limited self-restricting reinforced concrete slab member in bending and manufacturing method thereof |
| CN101709434A (en) * | 2009-12-23 | 2010-05-19 | 钢铁研究总院 | Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof |
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| CN107747048A (en) * | 2017-11-30 | 2018-03-02 | 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, Nb, Ti, Cr microalloy |
| CN109576583A (en) * | 2018-12-18 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method |
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Application publication date: 20151125 |