CN103667963B - The low-carbon bainite construction(al)steel of a kind of yield tensile ratio < 0.8 and production method - Google Patents
The low-carbon bainite construction(al)steel of a kind of yield tensile ratio < 0.8 and production method Download PDFInfo
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Abstract
A kind of yield tensile ratio & lt; The low-carbon bainite construction(al)steel of 0.8, do are its component and wt%: C:0.030 ~ 0.10%, Si:0.15 ~ 0.55%, Mn?: 1.45 ~ 1.80%, P & lt; 0.015%, S & lt; 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 & lt; 0.006%, W:0.11 ~ 0.80%; Production stage: desulfurizing iron; Converter top and bottom blowing; RH vacuum-treat, the treatment time is not less than 15min; Continuous casting; Strand heating is conventional insulation also; Roughing; Finish rolling; Section cooling; Naturally cool to room temperature.The present invention adopts TMCP rolling to deliver goods, and without the need to complicated thermal treatment process, adapts to produce greatly; Yield strength >=690MPa, tensile strength >=880MPa, unit elongation A >=21%, and excellent anti-seismic performance, i.e. yield tensile ratio & lt; 0.8, metallographic structure is that bainite adds ferrite; The engineering steel construction that high level, Super High require high strength and anti-seismic performance simultaneously can be widely used in.
Description
Technical field
The present invention relates to a kind of construction(al)steel and production method thereof, belong to low-carbon bainite construction(al)steel and the production method of a kind of yield tensile ratio <0.8 particularly.
Background technology
In recent years, manufacture of steel structure technology improves constantly, and in order to the high stratification of satisfied building, structure are 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 to 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 ensure that steel have good plastic deformation ability, and when there is earthquake, the stress concentration that steel construction produces and stress gradient make component can produce viscous deformation in very wide scope, absorb more seismic energy.Generally speaking, low intensive steel, containing more ferrite in its tissue, yield tensile ratio is lower.Along with the raising of intensity rank, should low yield strength ratio be ensured, have good welding property again, Composition Design window narrows, control difficulty larger.High-strength low-yield ratio realizes mainly through organizational controls, ensures that steel plate is made up of the soft phase (as ferrite) of some amount and hard phase (as bainite, martensite).
Have about the more report of low-carbon bainite steel in prior art, through retrieval:
China Patent Publication No. is the document of CN102071362A, disclose a kind of performance low carbon bainitic steel and production method, 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, disclose a kind of ultralow-carbon bainite steel plate and manufacture method thereof, 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 steel belt roof bolt.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 C0.02 ~ 0.05%, Si0.1 ~ 0.4%, Mn1.5 ~ 2.0%, P0.004 ~ 0.012%, Ti0.01 ~ 0.02%, S0.001 ~ 0.005%, Cu0.3 ~ 0.6%, Ni0.3 ~ 0.6%, Mo0.2 ~ 0.5%, Nb0.05 ~ 0.1%, surplus is Fe and is inevitably mingled with.The document adds more Cu and Ni, adds cost of alloy, and rolls out to obtain the yield tensile ratio about 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 excellent anti-seismic performance, i.e. yield tensile ratio <0.8, metallographic structure is that bainite adds ferrite and without the need to the low-carbon bainite construction(al)steel of yield tensile ratio <0.8 of heat-treating and production method.
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, control 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 and conventional insulation, heating and temperature control at 1170 ~ 1220 DEG C, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 DEG C, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 DEG C;
8) carry out section cooling, open cold temperature after rolling and control at 740 ~ 800 DEG C, red temperature controls at 250 ~ 450 DEG C, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) room temperature is naturally cooled to.
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 the impelling strength of steel and extension property.When carbon content exceedes a certain amount of, when welding, there is phenomenon of hardening in the welded heat affecting zone of steel, causes the generation of welding cold cracking.Therefore, C of the present invention selects at 0.030-0.10%.
Si is present in ferrite or austenite with the form of sosoloid in steel, and to improving, the intensity of sosoloid and the effect of cold deformation cementation index in steel are extremely strong, 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 selects at Si0.15-0.55%.
Mn is important highly malleablized element, and cost is low, and can improve hardening capacity significantly.But when Mn content is higher, there is the tendency making crystalline grain of steel alligatoring, and increase the crisp susceptibility of steel belt roof bolt.Therefore, Mn of the present invention selects at 1.45-1.80%.
P can improve the intensity of steel, strengthen the high-temperature corrosion-resistance performance of 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, occurs banded structure after making hot rolling.Therefore, strictly should limit the P content in steel, P of the present invention controls at <0.015%.
S has an impact 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 controls 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 selects at 0.10-0.35%.
Als Chang Zuowei deoxidant element adds in steel.Als and N also has stronger avidity, can fix the effect of N in steel.But when Als is more than 0.05%, easily make steel inclusion increase, reduce the purity of steel, and desoxydatoin reaches capacity, if raise, has negative impact to mother metal and welded heat affecting zone again.Therefore, Als of the present invention selects at 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 add production cost.Therefore, Ni of the present invention selects at 0.08-0.30%.
Cr adds the antioxygenation significantly improving steel in steel, strengthens the resistance to corrosion of steel.Cr energy and Fe form continuous solid solution, form multiple carbide, have remarkably influenced to the performance of steel with carbon.Cr still improves the effective element of steel hardenability simultaneously, but also increases steel belt roof bolt fragility tendency simultaneously, and can improve the hardenability of steel thus the susceptibility of the welding cold cracking of raising steel.Therefore, Cr of the present invention selects at 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.When existing with carbon, nitride graininess, effectively can be pinned at austenite grain boundary, contribute to the effect of organization steel grain coarsening, but the hardening capacity of steel can be made to reduce.But Ti is too high will reduce the low-temperature flexibility of mother metal.Therefore, Ti of the present invention selects at 0.008-0.045%.
Mo can be solid-solution in ferrite, austenite and carbide, is the element reducing austenite phase field.Have solution strengthening effect to ferrite, can improve the stability of carbide, thus 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 selects at 0.15-0.40%.
V is that reinforced ferrite encloses one of forming element mutually with austenite, mainly exists with the form of carbide in steel.V passes through tissue and the crystal grain of refinement steel, improves grain coarsening temperature, thus reduces the superheated susceptivity of steel, and improves intensity and the toughness of steel.When dissolving in austenite at high temperature, increasing the hardening capacity of steel, during as existed with carbide morphology, but reducing 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 selects at 0.02-0.08%.
Nb is strong carbonitride-forming elements, plays and act on very significantly in steel.It is by crystal grain thinning, improves grain coarsening temperature, reduces superheated susceptivity and the temper brittleness of steel, under certain existence, improves the intensity of steel and toughness and the drag etc. to creep.Nb is Precipitation in ferrite, can stop again the alligatoring etc. of heat affected zone crystal grain while improving intensity in welding process.Therefore, Nb of the present invention selects at 0.055-0.15%.
N is very strong formation and the element of stable austenite, improves the intensity of steel by solution strengthening and ageing strengthening.N can form nitride or carbonitride with elements such as Nb, Ti, makes steel mother metal tissue and weld structure grain refining.But N content exceedes certain limit, in Yi Gang, form bubble and loose, formed with the element such as Ti, Al in steel and be with corner angle brittle inclusion group etc.Therefore, N of the present invention controls at <0.006%.
W is the important characteristic element of the present invention.W forms austenite to enclose mutually and one of carbide.W is at high temperature solid-solution in austenite, improves austenite creep rupture strength at high temperature and creep resistance, reduces Cr spread coefficient in steel simultaneously, the solution strengthening effect of strengthening Cr.But when W content exceedes certain limit, the carbide of W can be formed in a large number, affect the toughness of steel.Therefore, W of the present invention selects at 0.11-0.80%.
The present invention compared with prior art, adopts TMCP rolling delivery, and without the need to complicated thermal treatment process, the technique cycle that is simple, that produce is short, adapts to large rhythm of production; Yield strength >=690MPa, tensile strength >=880MPa, unit elongation A >=21%, and excellent anti-seismic performance, i.e. yield tensile ratio <0.8, metallographic structure is that bainite adds ferrite and without the need to heat-treating; The engineering steel construction that high level, Super High require high strength and anti-seismic performance simultaneously can be widely used in.
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, control 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 and conventional insulation, heating and temperature control at 1170 ~ 1220 DEG C, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 DEG C, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 DEG C;
8) carry out section cooling, open cold temperature after rolling and control at 740 ~ 800 DEG C, red temperature controls at 250 ~ 450 DEG C, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) room temperature is naturally cooled to.
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 DEG C of impact of collision tests, and contrast with the compared steel of carrying out after tempering and find, compared steel yield strength after steel yield strength of the present invention and tempering is suitable, but yield tensile ratio is all lower than compared steel, illustrate that steel of the present invention has more excellent anti-seismic performance; Steel unit elongation A of the present invention all more than 20%, and higher than compared steel, illustrates that steel plasticity and toughness of the present invention are good.The present invention's-20 DEG C of ballistic works, higher than compared steel, illustrate that steel of the present invention has excellent low-temperature flexibility.
In sum, steel of the present invention has excellent anti-seismic performance and R
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, with low cost, and manufacturing process is simple, can be widely used in various Steel Structure Work.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
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 ~ 0.045% or 0.055 ~ 0.10%, Si:0.15 ~ 0.25% or 0.31 ~ 0.55%, Mn:1.45 ~ 1.49% or 1.53 ~ 1.8%, P<0.015%, S<0.010%, Cu:0.10 ~ 0.35%, Als:0.015 ~ 0.029% or 0.032 ~ 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:0.088 ~ 0.15%, N<0.006%, W:0.51 ~ 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,
Production stage:
1) desulfurizing iron, control 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 and conventional insulation, heating and temperature control at 1170 ~ 1220 DEG C, heating rate 8 ~ 11min/cm, and high pressure dephosphorization;
6) carry out roughing, controlling it, to start temperature be 1100 ~ 1140 DEG C, and total reduction is 70% ~ 75%;
7) carry out finish rolling, controlling its start rolling temperature is 870 ~ 960 DEG C;
8) carry out section cooling, open cold temperature after rolling and control at 740 ~ 800 DEG C, red temperature controls at 250 ~ 450 DEG C, and after overcooling, in steel, ferrite area percentage is 12% ~ 25%;
9) room temperature is naturally cooled to.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103866188B (en) * | 2014-03-31 | 2016-01-20 | 武汉钢铁(集团)公司 | Yield strength is 460MPa level fire-resistant corrosion-resistant anti-seismic steel for building and production method |
| CN103981459B (en) * | 2014-05-30 | 2016-03-16 | 武汉钢铁(集团)公司 | A kind of high-strength fireproof anti-seismic structure steel and production method |
| CN104946980B (en) * | 2015-06-18 | 2017-05-17 | 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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