CN103667963A - Low-carbon bainite construction steel with yield ratio of less than 0.8 and production method thereof - Google Patents
Low-carbon bainite construction steel with yield ratio of less than 0.8 and production method thereof Download PDFInfo
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Abstract
The invention provides low-carbon bainite construction steel with a yield ratio of less than 0.8. The low-carbon bainite construction steel comprises, by weight, 0.030 to 0.10% of C, 0.15 to 0.55% of Si, 1.45 to 1.80% of Mn, less than 0.015% of P, less than 0.010% of S, 0.10 to 0.35% of Cu, 0.015 to 0.05% of Als, 0.08 to 0.30% of Ni, 0.30 to 0.60% of Cr, 0.008 to 0.045% of Ti, 0.15 to 0.40% of Mo, 0.02 to 0.08% of V, 0.055 to 0.15% of Nb, less than 0.006% of N and 0.11 to 0.80% of W. The production method comprises the following steps: desulphurization of molten iron; converter top and bottom blowing; RH vacuum treatment, wherein treatment time is no less than 15 min; continuous casting; heating and conventional thermal insulation of a casting blank; rough rolling; finish rolling; laminar cooling; and natural cooling to room temperature. According to the invention, TMCP is utilized for rolling and delivery, complex heat treatment technology is not needed, and the production method is applicable to mass production; The low-carbon bainite construction steel has yield strength of no less than 690 MPa, tensile strength of no less than 880 MPa, elongation percentage A of no less than 21%, excellent anti-seismic performance, i.e., a yield ratio of less than 0.8, and a metallographic structure of bainite and ferrite, and is extensively applicable to high-rises, super high-rises and engineering steel structures requiring for both high strength and anti-seismic performance.
Description
Technical field
The present invention relates to a kind of construction(al)steel and production method thereof, belong to particularly low-carbon bainite construction(al)steel and the production method of a kind of yield tensile ratio <0.8.
Background technology
In recent years, manufacture of steel structure technology improves constantly, and in order to meet the high stratification of building, structure greatly across requirements such as changes, steel plate for building structure is just progressively towards future developments such as height strengthening, slab, low yield strength ratio, low-yield and customizations.Use high-strength low-yield ratio steel can alleviate structural weight, reduce laid down cost, reduce the thickness of steel plate, improve the aseismic reliability of structure.
Along with taking place frequently of earthquake, the anti-seismic performance of steel receives publicity all the more.Low yield strength ratio can guarantee that steel have good plastic deformation ability, and when there is earthquake, stress concentration and stress gradient that steel construction produces make member in very wide scope, produce viscous deformation, absorb more seismic energy.Generally speaking, low intensive steel, contains more ferrite in its tissue, and yield tensile ratio is lower.Along with the raising of intensity rank, should guarantee low yield strength ratio, there is again good welding property, Composition Design window narrows, controls difficulty larger.High-strength low-yield ratio is mainly realized by organizational controls, guarantees that steel plate is comprised of the soft phase (as ferrite) of some amount and hard phase (as bainite, martensite).
In prior art relevant for the more report of low-carbon bainite steel, through retrieval:
China Patent Publication No. is the document of CN102071362A, a kind of performance low carbon bainitic steel and production method are disclosed, this invention steel plate yield strength only reaches 550MPa rank, although this invention steel 33mm steel plate yield tensile ratio is less than 0.80, but the yield tensile ratio of 20mm steel plate is 0.86, less stable.
China Patent Publication No. is the document of CN102732790A, a kind of ultralow-carbon bainite steel plate and manufacture method thereof are disclosed, this invention steel Mn:3.0 ~ 4.5%, and by adjusting carbon content and adding a small amount of B, can realize the steel plate from 550MPa level to 950MPa level different stage, but high Mn can strengthen continuously cast bloom center segregation and increase the crisp susceptibility of tempering of steel.The yield tensile ratio of this invention 690MPa level steel plate is higher than 0.80, and unit elongation is lower, is only 16%.
Chinese patent is disclosed as the document of CN101381854B, discloses the bainite high-strength steel Heavy Plate Production method of low-carbon high-niobium content, this invention steel C 0.02 ~ 0.05%, Si 0.1 ~ 0.4%, Mn 1.5 ~ 2.0%, and P 0.004 ~ 0.012%, and Ti 0.01 ~ 0.02%, S 0.001 ~ 0.005%, Cu 0.3 ~ 0.6%, and Ni 0.3 ~ 0.6%, and Mo 0.2 ~ 0.5%, Nb 0.05 ~ 0.1%, and surplus is Fe and is inevitably mingled with.The document has added more Cu and Ni, has increased cost of alloy, and rolls out to obtain the yield tensile ratio approximately 0.89 of steel plate.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of yield strength >=690MPa is provided, tension >=880MPa, unit elongation A >=21%, and good anti-seismic performance, be yield tensile ratio <0.8, metallographic structure is that bainite adds ferrite and without low-carbon bainite construction(al)steel and the production method of the yield tensile ratio <0.8 heat-treating.
Realize the measure of above-mentioned purpose:
The low-carbon bainite construction(al)steel of a kind of yield tensile ratio <0.8, its component and weight percent content are: C:0.030 ~ 0.10%, Si:0.15 ~ 0.55%, Mn: 1.45 ~ 1.80%, P <0.015%, S <0.010%, Cu:0.10 ~ 0.35%, Als:0.015 ~ 0.05%, Ni:0.08 ~ 0.30%, Cr:0.30 ~ 0.60%, Ti:0.008 ~ 0.045%, Mo:0.15 ~ 0.40%, V: 0.02 ~ 0.08%, Nb:0.055 ~ 0.15%, N <0.006%, W:0.11 ~ 0.80%, all the other are Fe and inevitable impurity, meet Pcm=C+Si/30+(Mn+Cu+Cr simultaneously)/20+Ni/60+Mo/15+V/10+5B≤0.25%, 2.8≤(Cr+0.8Cu)/Ni≤6.0, metallographic structure is that bainite adds ferrite.
Preferably: the weight percent content of W is 0.12 ~ 0.75%.
Produce the method for the low-carbon bainite construction(al)steel of a kind of yield tensile ratio <0.8, its step:
1) desulfurizing iron, controls S≤0.001%, thickness of slag layer≤50mm;
2) converter top and bottom blowing;
3) carry out RH vacuum-treat, the treatment time is not less than 15min;
4) carry out continuous casting, adopt long nozzle protective casting and Ar envelope;
5) to strand heating conventional insulation, heating and temperature control is at 1170 ~ 1220 ℃, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 ℃, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 ℃;
8) carry out laminar flow cooling, open cold temperature and be controlled at 740 ~ 800 ℃ after rolling, red temperature is controlled at 250 ~ 450 ℃, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) naturally cool to room temperature.
The effect of each element in the present invention
C is main solution strengthening element, can significantly improve the intensity of steel.But carbon plays negative impact for impelling strength and the extension property of steel.When carbon content surpasses when a certain amount of, when welding, there is the phenomenon of hardening in the welded heat affecting zone of steel, causes the generation of welding cold cracking.Therefore, C of the present invention is chosen in 0.030-0.10%.
Si form with sosoloid in steel is present in ferrite or austenite, extremely strong to the intensity of sosoloid and the effect of cold deformation cementation index in raising steel, but Si too high levels can reduce the low-temperature flexibility of steel, worsens the welding property of steel.Therefore, Si of the present invention is chosen in Si 0.15-0.55%.
Mn is important highly malleablized element, and cost is low, and can improve significantly hardening capacity.But when Mn content is higher, there is the tendency that makes crystalline grain of steel alligatoring, and increase the crisp susceptibility of tempering of steel.Therefore, Mn of the present invention is chosen in 1.45-1.80%.
P can improve the intensity of steel, the high-temperature corrosion-resistance performance of enhancing steel.But P also can reduce plasticity, the toughness of steel, improve the brittle transition temperature of steel, increase low temperature brittleness.In addition, P easily forms P eutectic segregation and causes temper brittleness in crystal boundary in steel, makes to occur banded structure after hot rolling.Therefore, should strictly limit the P content in steel, P of the present invention is controlled at <0.015%.
S exerts an influence to the mechanical property of steel by forming sulfide inclusion, and can cause the anisotropy of performance, has a strong impact on the strain aging of steel simultaneously.Therefore, S of the present invention is controlled at <0.010%.
Cu mainly plays solution strengthening effect, improves hardening capacity, improves resistance to corrosion in steel.But Cu too high levels can affect the welding property of steel.Therefore, Cu of the present invention is chosen in 0.10-0.35%.
Als Chang Zuowei deoxidant element adds in steel.Als and N also have stronger avidity, the fixedly effect of N in steel.But when Als surpasses 0.05%, easily make steel inclusion increase, reduce the purity of steel, and desoxydatoin reaches capacity, if raise and mother metal and welded heat affecting zone are had to negative impact again.Therefore, Als of the present invention is chosen in 0.015-0.05%.
Ni expands austenitic area element, can reduce A
1-and A
3point, suppresses thick proeutectoid ferrite, significantly improves the toughness of steel, especially low-temperature flexibility.Ni can also improve hardening capacity and the erosion resistance of steel, if but Ni too high levels easily causes steel-plate iron oxide scale to be difficult to come off, and increased production cost.Therefore, Ni of the present invention is chosen in 0.08-0.30%.
Cr adds the antioxygenation that can significantly improve steel in steel, strengthens the resistance to corrosion of steel.Cr energy and Fe form continuous solid solution, form multiple carbide with carbon, and the performance of steel is had to remarkably influenced.Simultaneously Cr still improves the effective element of steel hardenability, but also increases the temper brittleness tendency of steel simultaneously, thereby and the hardenability that can improve steel improve the susceptibility of the welding cold cracking of steel.Therefore, Cr of the present invention is chosen in 0.30-0.60%.
Ti is one of strong ferrite former, and when existing with solid solution state, Ti is improved the effect of steel hardenability.While existing with carbon, nitride graininess, can effectively be pinned at austenite grain boundary, contribute to the effect of organization steel grain coarsening, but can make the hardening capacity of steel reduce.But Ti is too high, the low-temperature flexibility of mother metal will be reduced.Therefore, Ti of the present invention is chosen in 0.008-0.045%.
Mo can solid solution in ferrite, austenite and carbide, be the element that dwindles austenite phase region.Ferrite is had to solution strengthening effect, can improve the stability of carbide, thereby improve the intensity of steel, Mo plays advantageous effect to improving the ductility of steel and toughness and wear resistance simultaneously.In addition, Mo can also improve steel hardening capacity, improve heat resistance, prevent temper brittleness.But too high Mo content can worsen low-temperature flexibility and the welding property of steel.Therefore, Mo of the present invention is chosen in 0.15-0.40%.
V is that reinforced ferrite encloses one of forming element mutually with austenite, and in steel, mainly the form with carbide exists.V, by tissue and the crystal grain of refinement steel, improves grain coarsening temperature, thereby reduces the superheated susceptivity of steel, and improves intensity and the toughness of steel.When high temperature dissolves in austenite, increase the hardening capacity of steel, when existed with carbide morphology, but reduce the hardening capacity of steel.V can also increase the temper resistance of hardened steel, and produces secondary hardening effect.Therefore, V of the present invention is chosen in 0.02-0.08%.
Nb is strong carbonitride forming element, plays effect very significantly in steel.It improves grain coarsening temperature by crystal grain thinning, reduces superheated susceptivity and the temper brittleness of steel, under certain existence, improves the intensity of steel and toughness and to the drag of creep etc.Nb is Precipitation in ferrite, carries the high-intensity while can in welding process, stop again alligatoring of heat affected zone crystal grain etc.Therefore, Nb of the present invention is chosen in 0.055-0.15%.
N is very strong formation and the element of stable austenite, can improve by solution strengthening and ageing strengthening the intensity of steel.N can form nitride or carbonitride with the element such as Nb, Ti, makes steel mother metal tissue and weld structure grain refining.But N content surpasses certain limit, in Yi Gang, form bubble and loose, form band corner angle brittle inclusion group etc. with the element such as Ti, Al in steel.Therefore, N of the present invention is controlled at <0.006%.
W is the important characteristic element of the present invention.W forms austenite to enclose mutually and one of carbide.At high temperature solid solution of W, in austenite, improves austenite creep rupture strength and creep resistance at high temperature, reduces Cr spread coefficient in steel simultaneously, the solution strengthening effect of strengthening Cr.But when W content surpasses certain limit, can form in a large number the carbide of W, affect the toughness of steel.Therefore, W of the present invention is chosen in 0.11-0.80%.
The present invention compared with prior art, adopts TMCP rolling delivery, and without complicated thermal treatment process, the technique cycle simple, that produce is short, adapts to large rhythm of production; Yield strength >=690MPa, tensile strength >=880MPa, unit elongation A >=21%, and good anti-seismic performance, i.e. yield tensile ratio <0.8, metallographic structure is that bainite adds ferrite and without heat-treating; Can be widely used in the engineering steel construction that high level, Super High require high strength and anti-seismic performance simultaneously.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) desulfurizing iron, controls S≤0.001%, thickness of slag layer≤50mm;
2) converter top and bottom blowing;
3) carry out RH vacuum-treat, the treatment time is not less than 15min;
4) carry out continuous casting, adopt long nozzle protective casting and Ar envelope;
5) to strand heating conventional insulation, heating and temperature control is at 1170 ~ 1220 ℃, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 ℃, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 ℃;
8) carry out laminar flow cooling, open cold temperature and be controlled at 740 ~ 800 ℃ after rolling, red temperature is controlled at 250 ~ 450 ℃, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) naturally cool to room temperature.
The chemical composition list (wt%) of table 1 embodiment of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
The mechanical property contrast list of table 3 various embodiments of the present invention and comparative example
As can be seen from Table 3, steel plate of the present invention carries out normal temperature stretching experiment performance,-20 ℃ of impact of collision tests, and find with the compared steel contrast of carrying out after tempering, compared steel yield strength after steel yield strength of the present invention and tempering is suitable, but yield tensile ratio, all lower than compared steel, illustrates that steel of the present invention has more excellent anti-seismic performance; Steel unit elongation A of the present invention is all more than 20%, and higher than compared steel, illustrates that steel plasticity and toughness of the present invention are good.The present invention-20 ℃ ballistic work, higher than compared steel, illustrates that steel of the present invention has excellent low-temperature flexibility.
In sum, to have good anti-seismic performance be R to steel of the present invention
eL/ R
m<0.80, low-temperature flexibility and comprehensive mechanical performance.Steel of the present invention adopts TMCP technique, does not need to heat-treat, and with low cost, manufacturing process is simple, can be widely used in various Steel Structure Works.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (3)
1. the low-carbon bainite construction(al)steel of a yield tensile ratio <0.8, its component and weight percent content are: C:0.030 ~ 0.10%, Si:0.15 ~ 0.55%, Mn: 1.45 ~ 1.8%, P <0.015%, S <0.010%, Cu:0.10 ~ 0.35%, Als:0.015 ~ 0.05%, Ni:0.08 ~ 0.30%, Cr:0.30 ~ 0.60%, Ti:0.008 ~ 0.045%, Mo:0.15 ~ 0.4%, V: 0.02 ~ 0.08%, Nb:0.055 ~ 0.15%, N <0.006%, W:0.11 ~ 0.80%, all the other are Fe and inevitable impurity, meet Pcm=C+Si/30+(Mn+Cu+Cr simultaneously)/20+Ni/60+Mo/15+V/10+5B≤0.25%, 2.8≤(Cr+0.8Cu)/Ni≤6.0, metallographic structure is that bainite adds ferrite.
2. the low-carbon bainite construction(al)steel of a kind of yield tensile ratio <0.8 as claimed in claim 1, is characterized in that: the weight percent content of W is 0.12 ~ 0.75%.
3. produce the method for the low-carbon bainite construction(al)steel of a kind of yield tensile ratio <0.8 as claimed in claim 1, its step:
1) desulfurizing iron, controls S≤0.001%, thickness of slag layer≤50mm;
2) converter top and bottom blowing;
3) carry out RH vacuum-treat, the treatment time is not less than 15min;
4) carry out continuous casting, adopt long nozzle protective casting and Ar envelope;
5) to strand heating conventional insulation, heating and temperature control is at 1170 ~ 1220 ℃, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 ℃, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 ℃;
8) carry out laminar flow cooling, open cold temperature and be controlled at 740 ~ 800 ℃ after rolling, red temperature is controlled at 250 ~ 450 ℃, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) naturally cool to room temperature.
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Cited By (4)
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| CN103866188A (en) * | 2014-03-31 | 2014-06-18 | 武汉钢铁(集团)公司 | Fire-resistant corrosion-resistant anti-seismic construction steel with yield strength of 460MPa and production method |
| CN103981459A (en) * | 2014-05-30 | 2014-08-13 | 武汉钢铁(集团)公司 | High-strength refractory anti-seismic structure steel and production method thereof |
| CN104946980A (en) * | 2015-06-18 | 2015-09-30 | 舞阳钢铁有限责任公司 | TMCP and tempering type 550 Mpa-level corrosion resistant bridge steel and production method thereof |
| CN105950849A (en) * | 2016-05-27 | 2016-09-21 | 舞阳钢铁有限责任公司 | Production process of 690 MPa-grade high-strength steel plate with low yield ratio |
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| CN103667963B (en) | 2015-12-09 |
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