CN103981441A - Construction steel with yield strength of no less than 490 MPa and production method thereof - Google Patents
Construction steel with yield strength of no less than 490 MPa and production method thereof Download PDFInfo
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Abstract
The invention relates to construction steel with a yield strength of no less than 490 MPa, which comprises the following components in percentage by weight: 0.055-0.085% of C, 0.18-0.52% of Si, 1.25-1.60% of Mn, no more than 0.020% of P, no more than 0.012% of S, 0.015-0.05% of Als, and one or a mixture of 0.010-0.025% of Ti and 0.035-0.050% of Nb, wherein the mixture should satisfy that Nb+Ti accounts for 0.053-0.055%. A production method of the construction steel comprises the following production steps: desulfurizing molten iron; performing converter top/bottom blowing; performing RH vacuum treatment; performing continuous casting; heating a casting blank, and conventionally keeping the temperature; performing rough rolling, and dephosphorizing with high pressure water; performing precision rolling; relaxing for 5-8s; performing laminar cooling; and naturally cooling to room temperature. According to the invention, the construction steel is delivered in a TMCP state without being subjected to a heat treatment process, and the process is simple and short in production cycle; and the mechanical properties of the steel plate are as follows: the yield strength is no less than 480 MPa, the tensile strength is 600-720 MPa, the elongation percentage A is no less than 25%, the KV2 at -20 DEG C is no less than 200J, and the seismic resistance is excellent, i.e. the yield-tensile ratio is less than 0.8.
Description
Technical field
The present invention relates to a kind of construction(al)steel and production method thereof, belong to particularly a kind of yield strength >=490MPa construction(al)steel and production method, its particularly suitable TMCP explained hereafter.
Background technology
In prior art, relevant for the other steel of 460 MPa grade yield strength, there are many reports, through retrieving:
Publication number is the document of CN1537968A, a kind of manufacture method of 460 MPa grade yield strength low-alloy high-strength steel plate material is disclosed, this invention adopts cooling controlling and rolling controlling process, produced yield strength only up to 490MPa, yield tensile ratio at 0.80 ~ 0.83 steel plate.This invention hardness of steel surplus capacity is not enough, and anti-seismic performance is general, although by adopting high C-Mn to design, reached the object of falling alloy, has sacrificed welding property, has restricted its application, and the not enough 100J of-20 ℃ of impact toughness value of this invention steel plate, and low-temperature flexibility is poor.
Publication number is the document of CN102719737A, 460 MPa grade yield strength normalizing high strength steel plate and manufacture method thereof are disclosed, this invention adopts controlled rolling+normalizing process, armor plate strength performance and the extension property produced are better, and yield tensile ratio scope is 0.74 ~ 0.81, and anti-seismic performance is good, but obtaining of above performance must normalizing, increase energy consumption, increased production cost, extended the production cycle.This invention steel, in order to guarantee low-temperature flexibility, has added a large amount of Ni, and cost of alloy is higher.
Publication number is the document of CN102400053A, 460 MPa grade yield strength steel plate for building structure and manufacture method thereof are disclosed, this invention steel C 0.05 ~ 0.10%, Si 0.2 ~ 0.3%, Mn 1.4 ~ 1.6%, P≤0.015%, Ti 0.015 ~ 0.030%, S≤0.005%, Als 0.015 ~ 0.045%, Nb 0.025 ~ 0.060%, [O]≤0.0020%, [N]≤0.0040%, also contain Cr 0.2 ~ 0.4%, Mo 0.10 ~ 0.30%, a kind of in B 0.0010 ~ 0.0020%, and surplus is Fe and is inevitably mingled with.This invention steel adopts cooling controlling and rolling controlling process, the armor plate strength of producing higher, yield tensile ratio is lower than 0.8, low temperature impact properties is good, but unit elongation is on the low side, only up to 22.5%.This invention steel plate steel-making Composition Control is complicated, and operation easier is large, and except adding Nb and Ti, also needs to add a kind of in Cr, Mo and B, has increased cost of alloy.
Publication number is the document of CN201210091094.9; V-N microalloying 460MPa level slab and manufacture method thereof are disclosed; this invention steel adopts controlled rolling+quenching technology, the armor plate strength of producing higher, yield tensile ratio is lower; anti-seismic performance is good; low temperature impact properties is good, and unit elongation is general, and for reducing steel plate internal stress; later stage also needs to carry out temper conventionally, and twice heat treatment process greatly increased energy consumption, extended the production cycle.
China is in urbanization Rapid development stage, but a large amount of public, office, commercial affairs and residential housing still be take traditional skeleton construction and brick-concrete structure as main, adopt traditional method construction, can cause a large amount of resources and energy dissipation.According to statistics, the building waste that construction produces reaches 30 kilograms/square metre, if the building waste numerical value of counting in after useful life period can be huger.Compare with conventional steel Reinforced Concrete Buildings, steel building is a kind of green building of energy-conserving and environment-protective, has good safer, the steel construction of energy-conserving and environment-protective, anti-seismic performance from heavy and light and the advantage such as the construction period is short, can really embody the strategy of sustainable development.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of yield strength >=480MPa is provided, tensile strength: 600 ~ 720MPa, unit elongation A >=25%,-20 ℃ of KV2 >=200J and good anti-seismic performance, be yield tensile ratio <0.8, and without TMCP technique construction(al)steel and the production method of heat-treating.
Realize the measure of above-mentioned purpose:
Yield strength >=490MPa construction(al)steel, its component and weight percent content are: C:0.055 ~ 0.085%, Si:0.18 ~ 0.52%, Mn:1.25 ~ 1.60%, P≤0.020%, S≤0.012%, Als:0.015 ~ 0.05%, and add a kind of or compound interpolation in Ti:0.010 ~ 0.025% or Nb:0.035 ~ 0.050%, and compound interpolation should meet Nb+Ti:0.053 ~ 0.055%, and all the other are Fe and inevitable impurity; Meet Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B≤0.18% simultaneously; 1.8≤Nb/Ti≤4.5; Metallographic structure is ferrite+perlite, and both volume ratios are 3:2 ~ 7:3.
The method of production yield strength >=490MPa construction(al)steel, its step:
1) desulfurizing iron, controls molten iron temperature and is not less than 1250 ℃, [S]≤0.03%; The processing of skimming when thickness of slag layer is greater than 50mm, controls terminal [S]≤0.001%;
2) converter top and bottom blowing, and stir before and after tapping, churning time is not less than 1min;
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, superheating temperature is controlled at 15 ~ 25 ℃;
5) to strand heating conventional insulation, soaking temperature is controlled at 1190 ~ 1250 ℃, controls maximum heating temperature and is no more than 1320 ℃, and heating rate is not less than 8min/cm;
6) carry out roughing, dephosphorize by high pressure water, controls compression ratio and is not less than 3.0, controls its end temp at 1060 ~ 1000 ℃, and reduction in pass is greater than 20mm;
7) carry out finish rolling, control its start rolling temperature at 895 ~ 960 ℃, accumulative total draft is greater than 65%, and last three percentage pass reductions are greater than 40%;
8) carry out relaxation, the relaxation time is 5 ~ 8s;
9) carry out laminar flow cooling, open cold temperature and be controlled at 780 ~ 840 ℃ after rolling, red temperature is controlled at 500 ~ 700 ℃;
10) naturally cool to room temperature.
The effect of each element in the present invention
C is one of element of raising steel strength indispensable in steel.The every increase by 0.10% of carbon content, the large appointment of tensile strength improves 90MPa, and yield strength approximately improves 40 ~ 50MPa.C content is lower than 0.055% time, and strength property does not reach technical requirements, when C content is higher than 0.085% time, can worsen welding property, there will be the phenomenon of hardening, aggravation welding cold cracking tendency in welded heat affecting zone.Therefore, C of the present invention is chosen in 0.055 ~ 0.085%.
Si mainly with solution strengthening in ferrite, can improve the intensity of steel, be also the deoxidant element in steel.But if Si too high levels in steel can cause impelling strength significantly to decline, also unfavorable to welding property.Si content is lower than 0.18% time, and strength property is lower than index request, and when Si content is higher than 0.52% time, low-temperature flexibility declines obviously.Therefore, Si of the present invention is chosen in 0.18 ~ 0.52%.
Mn is important alloy element, is austenite stable element, is to guarantee steel strength and the indispensable element of toughness.But Mn too high levels, can form more MnS inclusion, reduce the low temperature fracture toughness of steel.Mn content is lower than 1.25% time, and armor plate strength deficiency is lower than index request, and when Mn content is higher than 1.6% time, grain coarsening is obvious, and low-temperature performance worsens.Therefore, Mn of the present invention is chosen in 1.25 ~ 1.60%.
P, S are difficult to the detrimental impurity element avoided in steel.High P can cause segregation, affects structure of steel homogeneity, reduces the plasticity of steel; It is unfavorable to low-temperature flexibility that S easily forms sulfide inclusion, and can cause the anisotropy of performance, has a strong impact on the strain aging of steel simultaneously.Therefore, should strictly limit P, S content in steel, P of the present invention is controlled at≤0.020%, and S is controlled at≤and 0.012%.
Als Chang Zuowei deoxidant element adds in steel.Als and N also have stronger avidity, and the fixedly effect of N in steel can reduce the strain aging sensitivity of steel, and by Grain Refinement Effect, improve intensity and the low-temperature flexibility of steel.Als content is lower than 0.015% time, and grain refinement effect is not obvious, and when Als content is higher than 0.05% time, Al oxide inclusion increases, and reduces the impelling strength of steel.Therefore, Als of the present invention is chosen in 0.015 ~ 0.05%.
Ti is a kind of strong carbonitride forming element, by forming solid carbon and fixed nitrogen, reduces the impact of strain aging.TiN, Ti (CN) particle can effectively be organized Austenite Grain Growth in heating and welding process, crystal grain thinning, the low-temperature flexibility of raising steel.When compound interpolation Ti and Nb, can further improve austenite recrystallization temperature, expand rolling technology scope.But Ti is too high, can be produced by TiC, low-temperature flexibility is reduced.Ti content is lower than 0.010% time, and Grain refinement is not obvious, when Ti content is higher than 0.025% time, is solid-solubilized in the embrittling effect of the Ti in ferrite higher than the effect of crystal grain thinning, has reduced impelling strength.Therefore, Ti of the present invention is chosen in 0.010 ~ 0.025%.
Nb is a kind of carbide, has strong Grain refinement, can significantly improve austenite recrystallization temperature, expands rolling technology scope, effectively avoids mixed grain structure to occur.The carbonitride particle that Nb forms in steel, both can effectively suppress growing up of austenite crystal, improved intensity and toughness, can reduce C free in steel, N content simultaneously, reduced the strain aging sensitivity of steel.But a large amount of Nb easily produces intergranular crack.Nb content lower than 0.035% time, is organized grain coarsening DeGrain, when Nb content is 0.050% time, it is maximum that grain refinement effect reaches, and continues to increase grain refinement effect and obviously do not improve, and increased cost of alloy, therefore, Nb of the present invention is chosen in 0.035 ~ 0.050%.
The present invention, adopts Nb, Ti alloying, and refinement invention crystalline grain of steel, guarantees that steel plate has good plasticity and toughness simultaneously, and rationally regulates C, Mn content, guarantees that welding property is excellent.Adopt rational Nb, Ti proportioning can meet object performance excellence, can reduce cost of alloy again.By rational steel rolling process, test steel property indices is excellent, and the later stage is without heat-treating, the use of can directly delivering goods.
The present invention compared with prior art, adopts the delivery of TMCP state, and without heat-treating technique, technique is simple, with short production cycle; And mechanical property of steel plate exists: yield strength >=480MPa, tensile strength: 600 ~ 720MPa, unit elongation A >=25% ,-20 ℃ of KV2 >=200J and good anti-seismic performance, i.e. yield tensile ratio <0.8.
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 TMCP processing step:
1) desulfurizing iron, controls molten iron temperature and is not less than 1250 ℃, [S]≤0.03%; The processing of skimming when thickness of slag layer is greater than 50mm, controls terminal [S]≤0.001%;
2) converter top and bottom blowing, and stir before and after tapping, churning time is not less than 1min;
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, superheating temperature is controlled at 15 ~ 25 ℃;
5) to strand heating conventional insulation, soaking temperature is controlled at 1190 ~ 1250 ℃, controls maximum heating temperature and is no more than 1320 ℃, and heating rate is not less than 8min/cm;
6) carry out roughing, dephosphorize by high pressure water, controls compression ratio and is not less than 3.0, controls its end temp at 1060 ~ 1000 ℃, and reduction in pass is greater than 20mm;
7) carry out finish rolling, control its start rolling temperature at 895 ~ 960 ℃, accumulative total draft is greater than 65%, and last three percentage pass reductions are greater than 40%;
8) carry out relaxation, the relaxation time is 5 ~ 8s;
9) carry out laminar flow cooling, open cold temperature and be controlled at 780 ~ 840 ℃ after rolling, red temperature is controlled at 500 ~ 700 ℃;
10) 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 compared steel contrast, generally speaking, steel yield strength of the present invention and tensile strength are all better than compared steel, and yield tensile ratio is 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, higher than compared steel and all more than 25%, embodies good plasticity and toughness.The present invention-20 ℃ impact toughness value is higher more than 200J, illustrates that steel of the present invention has more excellent low-temperature flexibility.When steel of the present invention only adopts Ti alloying, plate property is still excellent, illustrates that steel of the present invention has certain economy.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. yield strength >=490MPa construction(al)steel, its component and weight percent content are: C:0.055 ~ 0.085%, Si:0.18 ~ 0.52%, Mn:1.25 ~ 1.60%, P≤0.020%, S≤0.012%, Als:0.015 ~ 0.05%, and add a kind of or compound interpolation in Ti:0.010 ~ 0.025% or Nb:0.035 ~ 0.050%, and compound interpolation should meet Nb+Ti:0.053 ~ 0.055%, and all the other are Fe and inevitable impurity; Meet Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B≤0.18% simultaneously; 1.8≤Nb/Ti≤4.5; Metallographic structure is ferrite+perlite, and both volume ratios are 3:2 ~ 7:3.
2. the method for the yield strength >=490MPa construction(al)steel described in production claim 1, its step:
1) desulfurizing iron, controls molten iron temperature and is not less than 1250 ℃, [S]≤0.03%; The processing of skimming when thickness of slag layer is greater than 50mm, controls terminal [S]≤0.001%;
2) converter top and bottom blowing, and stir before and after tapping, churning time is not less than 1min;
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, superheating temperature is controlled at 15 ~ 25 ℃;
5) to strand heating conventional insulation, soaking temperature is controlled at 1190 ~ 1250 ℃, controls maximum heating temperature and is no more than 1320 ℃, and heating rate is not less than 8min/cm;
6) carry out roughing, dephosphorize by high pressure water, controls compression ratio and is not less than 3.0, controls its end temp at 1060 ~ 1000 ℃, and reduction in pass is greater than 20mm;
7) carry out finish rolling, control its start rolling temperature at 895 ~ 960 ℃, accumulative total draft is greater than 65%, and last three percentage pass reductions are greater than 40%;
8) carry out relaxation, the relaxation time is 5 ~ 8s;
9) carry out laminar flow cooling, open cold temperature and be controlled at 780 ~ 840 ℃ after rolling, red temperature is controlled at 500 ~ 700 ℃;
10) naturally cool to room temperature.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105506450A (en) * | 2015-12-10 | 2016-04-20 | 南京钢铁股份有限公司 | Anti-seismic and weather-proof bridge steel and manufacturing process thereof |
| CN106834919A (en) * | 2016-12-22 | 2017-06-13 | 南京钢铁股份有限公司 | A kind of 460MPa grade high ductilities low-alloy high-strength structural steel plate and its production method |
| CN109112409A (en) * | 2018-09-27 | 2019-01-01 | 北京科技大学 | A kind of low yield strength ratio thin gauge F+P steel plate controlled rolling and controlled cooling production technology |
| CN109234635A (en) * | 2018-10-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof |
| CN109252090A (en) * | 2018-08-30 | 2019-01-22 | 南京钢铁股份有限公司 | High silicon content 345MPa grade low-temp ductile structure steel plate and manufacturing method |
| CN109898024A (en) * | 2019-04-22 | 2019-06-18 | 南京钢铁股份有限公司 | Low yield strength ratio TMCP type surrenders 345MPa building iron and production method |
| CN110066966A (en) * | 2019-05-22 | 2019-07-30 | 武汉钢铁有限公司 | A kind of low internal stress titaniferous high-strength steel and production method |
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| CN105506450A (en) * | 2015-12-10 | 2016-04-20 | 南京钢铁股份有限公司 | Anti-seismic and weather-proof bridge steel and manufacturing process thereof |
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| CN109252090A (en) * | 2018-08-30 | 2019-01-22 | 南京钢铁股份有限公司 | High silicon content 345MPa grade low-temp ductile structure steel plate and manufacturing method |
| CN109112409A (en) * | 2018-09-27 | 2019-01-01 | 北京科技大学 | A kind of low yield strength ratio thin gauge F+P steel plate controlled rolling and controlled cooling production technology |
| CN109112409B (en) * | 2018-09-27 | 2020-04-28 | 北京科技大学 | Controlled rolling and controlled cooling production process for low-yield-ratio thin F + P steel plate |
| CN109234635A (en) * | 2018-10-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof |
| CN109898024A (en) * | 2019-04-22 | 2019-06-18 | 南京钢铁股份有限公司 | Low yield strength ratio TMCP type surrenders 345MPa building iron and production method |
| CN110066966A (en) * | 2019-05-22 | 2019-07-30 | 武汉钢铁有限公司 | A kind of low internal stress titaniferous high-strength steel and production method |
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