CN101781736A - Yield strength 225MPa-level earthquake-resistant construction steel and production method thereof - Google Patents
Yield strength 225MPa-level earthquake-resistant construction steel and production method thereof Download PDFInfo
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Abstract
The invention discloses yield strength 225MPa-level earthquake-resistant construction steel and a production method thereof. The steel comprises the following chemical compositions in percentage by weight: 0.01 to 0.05 percent of C, 0.01 to 0.04 percent of Si, 0.20 to 0.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.002 to 0.007 percent of Mg, 0.001 to 0.003 percent of N, 0.005 to 0.015 percent of Re, less than or equal to 0.070 percent of Ti, less than or equal to 0.020 percent of Nb, less than or equal to 0.0520 percent of Al, and the balance of Fe and inevitable impurities. The production method for the earthquake-resistant construction steel comprises the following steps of hot metal desulphurization, converter blowing, vacuum treatment, continuous casting, hot rolling, cooling, and the like. When the yield strength of the steel products exceeds 245MPa, a step of annealing treatment is added after the cooling step. Experiments prove that the yield strength 225MPa-level earthquake-resistant construction steel has the characteristics of low yield strength, high elongation and excellent impact toughness, and the production method has the advantages of simple process and low production cost.
Description
Technical field
The present invention relates to construction(al)steel, refer to a kind of Yield strength 225 MPa-level earthquake-resistant construction steel and production method thereof particularly.
Background technology
Along with the development of steel building cause, the anti-seismic performance that improves steel construction becomes one of requisite measure that guarantees building safety.In steel building is aseismic design, can absorb the energy that earthquake produces by the steel construction viscous deformation, this just requires the construction(al)steel material that lower yield strength, plastic deformation ability and good elongation are preferably arranged.
Before the present invention, the Chinese invention patent prospectus of application number 200710046076.8 has been introduced a kind of extremely low yield point steel plate and manufacture method thereof.This steel plate chemical ingredients consists of (mass percent): C:0.006～0.018%, Si≤0.10%, Mn:0.10～0.30%, P≤0.015%, S≤0.005%, Nb:0.035～0.055%, V:0.025～0.055%, Als:0.035～0.055%, Ti:0.015～0.025%, N≤0.0025%, Ca:0.001～0.005%, and surplus is Fe and unavoidable impurities.The purpose of wherein adding trace Ti, Nb, V is to eliminate solid solution C, N interstitial atom in the steel, makes steel plate when obtaining extremely low yield point and excellent room temperature deformability, also has the superior weldability energy; Adding Ca and then be on the one hand can pure molten steel, on the other hand sulfide in the steel is carried out denaturing treatment, suppress sulphur red brittleness, improve steel plate deformation at room temperature ability.In addition, this invention chemical element also need satisfy following relation: Ti/N 〉=8.0, Als/N 〉=15, (0.13Nb+0.23V) 〉=and 1.02C, Ti/Nb:0.20～0.60, Ca/S:0.50～3.0.Unitized design by these microalloy elements, hot rolling technology (finishing temperature≤1050 ℃) and normalizing heat treatment technique (960～1000 ℃ of normalizing temperatures, soaking time 1.5～2.5min/mm * steel plate thickness t) combines, obtained yield-point YP≤235MPa, unit elongation δ 5 〉=50%, the steel plate microstructure is single-phase ferrite, is applicable to the antidetonation deoscillator of making large-scale steel structure.The patent (JP20060113479) " LOW YIELD POINT STEEL FOR DAMPERAND ITS PRODUCTION METHOD " of Japan NIPPON STEEL CORP application, a kind of shock-resistant and energy-dissipating deoscillator low-yield steel that is used to make is disclosed, yield strength is 150～250MPa, the weight percent of its chemical ingredients is: C:0.001～0.050, Si≤0.80, Mn:0.1～2.0, P≤0.020, S≤0.015, its content of Nb:0.01～0.60 is 8 times of C content, Al≤0.060, N≤0.006 can also be contained among the Ti/V/B/Ni/Cu/Cr/Mo/Ca/RE one or more in addition as required.This patent steel grade has effectively reduced the yield strength of steel, can better adapt to the needs of building aseismicity performance.But its chemical ingredients of the steel of these two patent disclosures is comparatively complicated, the alloying element content height, and its steel plate foreign matter content is higher, and its weathering resistance and welding property are ungood.And their production alloying cost is higher, and technological process of production complexity can not better adapt to the needs of large-scale production.
Summary of the invention
Purpose of the present invention will provide a kind of Yield strength 225 MPa-level earthquake-resistant construction steel and production method thereof exactly.This steel has the advantages that yield strength is low, unit elongation is high and shock resistance is good, and its technological process of production is simple, production cost is low.
For achieving the above object, the Yield strength 225 MPa-level earthquake-resistant construction steel that the present invention is designed, its chemical ingredients percentage ratio is by weight counted: C:0.01～0.05, Si:0.01～0.04, Mn:0.20～0.70, P≤0.010, S≤0.005, Mg:0.002～0.007, N:0.001～0.003, Re:0.005～0.015, Ti≤0.070, Nb≤0.020, Al≤0.050, all the other inevitably are mingled with for Fe reaches.
The production method of Yield strength 225 MPa-level earthquake-resistant construction steel of the present invention is produced by common ultra-clean steel technology, comprises desulfurizing iron, bessemerizes, the step of vacuum-treat, continuous casting, hot rolling, cooling process, and its special character is:
Add in the described vacuum-treat step and add the Re alloy in Mg alloy, the described continuous casting step and carry out Alloying Treatment, make component in the steel satisfy the requirement of described weight percent;
In the described hot-rolled step, billet heating temperature is controlled at 1200～1230 ℃, and heating rate is controlled at 8～14min/cm, and start rolling temperature is controlled at 1100～1200 ℃, three roads, controlled rolling end accumulative total draft 30～50%, and finishing temperature is controlled at 830～870 ℃.
Further, also be provided with the anneal step after the described cooling process step, annealing temperature is controlled at 770～820 ℃, and soaking time is controlled at (30～40) min+ thickness of slab (mm) * 1min/mm, repeats the step of cooling process after annealing finishes again.
Further, in the described cooling process step, employing adds the shield cap cooling or stacking refrigerative mode slowly cools to room temperature.
Below analyze explanation with regard to the chemical ingredients and the production method thereof of Yield strength 225 MPa-level earthquake-resistant construction steel of the present invention:
C is the one of the chief elements that improves intensity in the steel, and is bigger to intensity, unit elongation and the impelling strength influence of steel.Anti-seismic construction steel yield strength of the present invention, tensile strength are low, and the yield strength narrow range, and the weight percentage of its C is controlled at 0.01～0.05 scope.
Si and Mn have the solution strengthening effect in steel, especially when C content during in low scope, the two is just comparatively obvious to the influence of intensity.Need further control Si, Mn constituent content for the low-yield steel, the weight percentage of Si of the present invention is controlled at 0.01～0.04 scope, and the weight percentage of Mn is controlled at 0.20～0.70 scope.
P and S belong to detrimental impurity in steel of the present invention, in order to reduce P, S detrimentally affect to the ultra low-carbon steel toughness plasticity, need P, S weight percentage in the strict control steel, so the present invention is controlled at P≤0.010, the lower ratio in S≤0.005, thereby reduce P, S detrimentally affect to product performance.
Mg and O, S unit have higher avidity, it is 0.002～0.007 Mg element that the present invention adds weight percentage, can obviously improve the deoxidation and the sweetening power of steel plate, reach good desulfurization, deoxidation and the effect of controlling inclusion morphology and distribution, improve the purity of steel, and reduced the influence of inclusion structure property.
N content also has a significant impact the mechanical property of steel, and along with the decline of N content, the unit elongation of steel and end face shrinking percentage are significantly improved, but N content is too much, and the N of solid solution can cause welding heat influence area toughness to worsen again in the steel.The present invention is defined as 0.001～0.003 with the N weight percentage.
Re can play desulfurization, improve the effect of oxide inclusion form, cleaning molten steel, can further reduce inclusion to hardness of steel, flexible influence, improves steel plate weather resistance and welding property.The content of Re is controlled at 0.005～0.015 among the present invention.
Ti and Nb are two kinds of intensive carbide and nitride forming element, in the design of ultra low-carbon steel IF steel chemical composition, Ti, Nb element that independent or compound interpolation is an amount of can make C, N atom in the steel be fixed to carbide, nitride, present the gap-free atom state.Studies show that, in steel, should not add excessive Ti element, thereby more Ti can make its carbonitride particle alligatoring lose the crystal boundary pinning effect.A certain amount of Ti, Nb also can play and improve the effect of steel grade flexible.It is the steel chemical composition design that anti-seismic construction steel of the present invention adopts Ultra-low carbon, but because its yield strength is in the scope of higher relatively, an easy acquisition, Ti, Nb element are not the necessary elements that adds of anti-seismic construction steel of the present invention, so the weight percentage of Ti, Nb is controlled to be Ti≤0.070, Nb≤0.020 among the present invention.
Al can play traditional reductor effect, and the scope that the weight percentage of the Al among the present invention is controlled at below 0.050 plays good effect to deoxidation.
Yield strength 225 MPa-level earthquake-resistant construction steel of the present invention adopts the Ultra-low carbon of alloying elements such as low C, Si, Mn on chemical ingredients be the steel design, pass through to add the Mg element in the smelting process, utilize itself and O, the higher avidity of S element, reach good desulfurization, deoxidation and the effect of controlling inclusion morphology and distribution, improved the purity of steel.Further reduce inclusion to hardness of steel, flexible influence by adding an amount of Re element, improved steel plate weather resistance and welding property.
Production method of the present invention adopts the desulfurizing iron technology, the converter top and bottom blowing, and vacuum-treat and continuous casting process are produced by common ultra-clean steel technology.Concern according to Hall-Petch: σ
y=σ
i+ K
yd
-1/2(σ in the formula
yBe ferrite yield strength, σ
iThe yield strength that is equivalent to monocrystalline, K
yBe the constant relevant with grain boundary structure, d is the mean diameter of ferrite crystal grain) as can be known, increase ferrite grain size yield strength is reduced, and the size of grain-size is subjected to the influence of factors such as chemical ingredients, rolling technology, thermal treatment Heating temperature and soaking time in the tissue.Therefore, the present invention adopts the technology of the fast speed rolling of high temperature to impel steel plate crystal grain to increase, billet heating temperature is controlled at 1200～1230 ℃, heating rate is controlled at 8～14min/cm, the start rolling temperature of steel is controlled at 1100～1200 ℃, three roads, controlled rolling end accumulative total draft 30～50%, finishing temperature is controlled at 830～870 ℃.Adopt modes such as adding shield cap cooling or stacking cooling to slowly cool to room temperature at last, further grow up the extremely low scope of the yield strength of gained product made from steel between 205～245MPa to promote crystal grain.If the yield strength of product made from steel still is higher than the upper limit of above-mentioned design requirements scope at this moment, then product made from steel further can be adopted anneal, annealing temperature is controlled to be 770～820 ℃, soaking time is controlled to be 30 basic～40min, follow again according to steel plate thickness proper extension (the every increase of steel plate thickness 1mm, prolong 1min heat-up time), be that soaking time is controlled at (30～40) min+ thickness of slab (mm) * 1min/mm and can promotes to organize crystal grain to increase preferably, obtain enough low yield strength, adopt modes such as adding shield cap cooling or stacking cooling to slowly cool to room temperature then.
Earthquake-resistant structure steel microscopic structure of the present invention is that ferrite adds a small amount of pearlitic structure, grain-size is big, have good impelling strength and cold and hot working performance and superior corrosion resistance energy, welding property and damping performance, be applicable to that various steel buildings and other possess the low alloy steel structure and the device of damping performance requirement.Simultaneously, production method technology of the present invention is simple, and the alloying cost is low, and the product made from steel yield strength scope of utilizing the inventive method to produce is controlled at the narrower zone of 40Mpa, has ensured that preferably the product made from steel of producing has stable performance.
Embodiment
Below in conjunction with specific embodiment Yield strength 225 MPa-level earthquake-resistant construction steel of the present invention and production method thereof are described in further detail.
Table 1 has been listed the anti-seismic construction steel chemical component weight percentage composition (surplus is that Fe reaches unavoidably at impurity) of the embodiment of the invention 1～8, and the composition weight percentage of commercially available common building steel (compared steel) (surplus is that Fe reaches unavoidably at impurity).
Table 1:
Steel in the foregoing description 1～8 are produced by common ultra-clean steel technology, and by desulfurizing iron, the converter top and bottom blowing adds the Re alloy and carries out alloying when adding Mg alloy, continuous casting during vacuum-treat, and continuous casting, is cooled to room temperature at hot rolling.When hot rolling, billet heating temperature is controlled at 1200～1230 ℃, and heating rate is controlled at 8～14min/cm, and the start rolling temperature of steel is controlled at 1100～1200 ℃, three roads, controlled rolling end accumulative total draft 30～50%, and finishing temperature is controlled at 830～870 ℃; Specification to embodiment 1～8 steel rolling steel plate is followed successively by 18mm, 20mm, 35mm, 30mm, 20mm, 35mm, 30mm, 25mm.At last, adopt and to add the shield cap cooling or stacking refrigerative mode slowly cools to room temperature.The product made from steel that yield strength wherein is higher than 245MPa, adopt anneal again, annealing temperature is controlled at 770～820 ℃, and soaking time is controlled at (30～40) min+ thickness of slab (mm) * 1min/mm, and repeated using adds shield cap cooling or stacking refrigerative mode slowly cools to room temperature again.
The earthquake-resistant structure product made from steel of his-and-hers watches 1 described embodiment 1～8 and compared steel 1～4 carry out mechanical property such as yield strength, impelling strength, unit elongation and the inclusion rank adopts national standard method to test, and test result sees Table 2.
Table 2:
| Yield strength (MPa) | Impelling strength (20 ℃, A KV，J) | Unit elongation (%) | Grain fineness number | The inclusion rank | |
| Embodiment 1 | ??210 | ??275 | ??50 | 7 grades | ??B1.5 |
| Yield strength (MPa) | Impelling strength (20 ℃, A KV，J) | Unit elongation (%) | Grain fineness number | The inclusion rank | |
| Embodiment 2 | ??235 | ??285 | ??40 | 6 grades | ??B1 |
| Embodiment 3 | ??230 | ??290 | ??51 | 5.5 level | ??B1 |
| Embodiment 4 | ??205 | ??280 | ??50 | 7 grades | ??B2 |
| Embodiment 5 | ??220 | ??295 | ??51 | 7.5 level | ??B1.5 |
| Embodiment 6 | ??240 | ??285 | ??50 | 7 grades | ??B2 |
| Embodiment 7 | ??230 | ??280 | ??52 | 5 grades | ??B1 |
| Embodiment 8 | ??245 | ??275 | ??53 | 5 grades | ??B2 |
| Compared steel 1 | ??255 | ??80 | ??41 | 5 grades | ??A3、B2 |
| Compared steel 2 | ??260 | ??105 | ??45 | 6 grades | ??A2、B3 |
| Compared steel 3 | ??285 | ??90 | ??43 | 5 grades | ??A2、B2 |
| Compared steel 4 | ??260 | ??95 | ??46 | 7 grades | ??A3、B2 |
Data by table 2 as can be seen, the extremely low scope of the yield strength of earthquake-resistant structure product made from steel of the present invention between 205～245MPa, its impelling strength is more excellent than ordinary steel, the unit elongation performance is fabulous all above 40%, and anti-seismic construction steel inclusion of the present invention is mainly oxide compound, and the inclusion rank is low, and steel is pure, grain fineness number concentrates on about 6 grades, and grain-size is controlled easily.Test shows that steel plate of the present invention has good seismic resistance, welding property and weather resistance.
Anti-seismic construction steel of the present invention can carry out the welding of methods such as manual metal-arc welding, union-melt weld or shielded welding; be used to build various steel buildings, pylon and other possesses the low alloy steel structure and the device of damping performance requirement; can when earthquake, at first surrender; absorb seismic wave effectively; effectively reduce the damage effect that earthquake or other high vibrations bring, avoid the destruction of main structure body.
Claims (4)
1. Yield strength 225 MPa-level earthquake-resistant construction steel, its chemical ingredients percentage ratio is by weight counted: C:0.01～0.05, Si:0.01～0.04, Mn:0.20～0.70, P≤0.010, S≤0.005, Mg:0.002～0.007, N:0.001～0.003, Re:0.005～0.015, Ti≤0.070, Nb≤0.020, Al≤0.050, all the other inevitably are mingled with for Fe reaches.
2. the production method of the described Yield strength 225 MPa-level earthquake-resistant construction steel of claim 1 comprises desulfurizing iron, bessemerizes, the step of vacuum-treat, continuous casting, hot rolling, cooling process, it is characterized in that:
Add in the described vacuum-treat step and add the Re alloy in Mg alloy, the described continuous casting step and carry out Alloying Treatment, make component in the steel satisfy the requirement of described weight percent;
In the described hot-rolled step, billet heating temperature is controlled at 1200～1230 ℃, and heating rate is controlled at 8～14min/cm, and start rolling temperature is controlled at 1100～1200 ℃, three roads, controlled rolling end accumulative total draft 30～50%, and finishing temperature is controlled at 830～870 ℃.
3. the production method of Yield strength 225 MPa-level earthquake-resistant construction steel according to claim 2, it is characterized in that: also be provided with the anneal step after the described cooling process step, annealing temperature is controlled at 770～820 ℃, soaking time is controlled at (30～40) min+ thickness of slab (mm) * 1min/mm, repeats the step of cooling process after annealing finishes again.
4. according to the production method of claim 2 or 3 described Yield strength 225 MPa-level earthquake-resistant construction steels, it is characterized in that: in the described cooling process step, employing adds the shield cap cooling or stacking refrigerative mode slowly cools to room temperature.
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| CN103695773A (en) * | 2013-12-11 | 2014-04-02 | 武汉钢铁(集团)公司 | 690MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof |
| CN104099517A (en) * | 2014-07-15 | 2014-10-15 | 首钢总公司 | Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance |
| CN104233061A (en) * | 2014-10-08 | 2014-12-24 | 南京钢铁股份有限公司 | Low-temperature low-yield steel and manufacturing method thereof |
| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN115369329A (en) * | 2022-09-30 | 2022-11-22 | 武汉钢铁有限公司 | Wide-width thin-specification high-surface-quality hot-rolled deep-drawing enamel steel and production method thereof |
| CN115522129A (en) * | 2022-09-30 | 2022-12-27 | 武汉钢铁有限公司 | 330 MPa-level wide-width thin-specification high-quality hot-rolled enamel steel and production method thereof |
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| CN107574296B (en) * | 2017-09-23 | 2019-03-19 | 武钢集团昆明钢铁股份有限公司 | A kind of 225MPa grades of low-yield point damper steel plates of low cost and strip production methods |
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| CN103695773A (en) * | 2013-12-11 | 2014-04-02 | 武汉钢铁(集团)公司 | 690MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof |
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| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN115369329A (en) * | 2022-09-30 | 2022-11-22 | 武汉钢铁有限公司 | Wide-width thin-specification high-surface-quality hot-rolled deep-drawing enamel steel and production method thereof |
| CN115522129A (en) * | 2022-09-30 | 2022-12-27 | 武汉钢铁有限公司 | 330 MPa-level wide-width thin-specification high-quality hot-rolled enamel steel and production method thereof |
| CN115522129B (en) * | 2022-09-30 | 2023-10-20 | 武汉钢铁有限公司 | 330 MPa-level wide-width thin-specification high-quality hot rolled enamel steel and production method thereof |
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