CN101407893B - High strength, high heat input welding property, fire resistant and earthquake resistant steel for construction and production method thereof - Google Patents
High strength, high heat input welding property, fire resistant and earthquake resistant steel for construction and production method thereof Download PDFInfo
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Abstract
The invention discloses high-strength large heat-input welding fireproof steel used for earthquake-proof buildings and a production method thereof, belonging to the manufacturing field of low alloy high-strength steel. The steel consists of two or more than two of the compositions with the following weight percentages: 0.02 to 0.14 percent of C, 0.10 to 0.60 percent of Si, 0.60 to 1.80 percent ofMn, equal to or less than 0.020 percent of P, equal to or less than 0.010 percent of S, equal to or less than 0.040 percent of Nb, 0.05 to 0.15 percent of Cr, 0.05 to 0.15 percent of Mo, 0.0020 to 0.0055 percent of N and equal to or less than 0.05 percent of V, 0.005 to 0.030 percent of Ti, equal to or less than 0.010 percent of Ca and equal to or less than 0.010 percent of Mg; and the residual quantity is Fe and unavoidable impurities. The chemical compositions meet the following conditions: (1) the sum of 4.0 C plus Mn is equal to or less than 2.0; (2) the sum of Cr plus Mo is more than or equal to 0.15 and less than or equal to 0.03; and (3) the carbon equivalence (percent) equals to the sum of C plus Si/24, Mn/6, Ni/40, Cr/5, Mo/4 and V/14 and the sum is equal to or less than 0.38. The steel is simple in chemical composition, low in content of noble metal and good in mechanical property, and has excellent large heat input welding performance, fireproofness and earthquake-proof performance.
Description
Technical field
The invention belongs to low-alloy high-strength steel and make field, a kind of specifically high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction and production method thereof.
Background technology
The quickening of the development of Chinese national economy and urban construction speed, high-rise public building grows with each passing day, and especially high-rise building has all adopted the form of steel construction.Can estimate that along with the raising of China's overall technology level, steel building will provide more, safer, more environmental protection, more comfortable inhabitation and activity space for common people and society.Thus, make building trade more and more higher to the requirement of using steel, China's construction(al)steel will face some new problems of technology upgrading such as fire performance, welding property and the anti-seismic performance to material and technical progress.Therefore develop economical refractory anti-seismic construction and not only can fill the domestic gaps with steel, import substitutes, and contribute for China's construction business and social development.
Before the present invention, Chinese patent 01133562.9, high-performance refractory weather-resisting building steel and production method thereof disclose the patented technology of a kind of high-performance refractory weather-resisting building steel and production method thereof.This patented invention steel contains C, Si, Mn, P, S, Mo, Ti, Al, N, O, Cr, Ni, Cu, Ca, B, contains among Nb, V, the RE one or more in addition, and surplus is Fe.This patented invention steel makes steel have high strength, high tenacity and good fire-resistant, weathering resistance through smelting, rolling and thermal treatment.This patented invention steel is delivered goods with non-quality adjustment condition, production technique is simple relatively, it is the various structural parts of the steel work of 4～100mm that the fields such as building, building and ocean structure that can be provide thickness, (its heat affected zone (HAZ) has high toughness under 50～100kJ/cm) welding conditionss at large-line energies such as electrosgas welding, electroslag welding, high frequency resistance weldings, improve the welding efficiency of engineering structure, reduced manufacturing cost.The deficiency of this patent is the alloying element complexity, and precious metal alloys elements Mo, Cr equal size are higher, and alloying cost height has limited use, and steel plate do not possess anti-seismic performance, has limitation for the steel for building in high-rise building and the multiple area of earthquake.
The B490RNQ structural steel that China's Baosteel production has the high antidetonation fire-resistant and weather-resistant of high strength characteristic, be used to make the high antidetonation square steel tube of the big specification heavy wall of clod wash, but it is complicated that the deficiency of this steel is alloying element equally, precious metal alloys elements Mo, Cr equal size are higher, alloying cost height has limited use.
The fire-resistant H shaped steel (anti-600 ℃ of high temperature) of China's horse steel development, the ultra-thick h shape steel that adopts non-water-cooling type TMCP (controlled rolling and controlled cooling) technology to make, when thickness surpasses 400mm, also can guaranteed performance require and good weldability, do not reduce the intensity of mother metal and welded heat affecting zone.But this steel is a H shaped steel, and is different with steel plate of the present invention, and in addition, this steel precious metal alloys elements Mo, Cr equal size are also higher, cause alloying cost height, limited use, and this steel do not possess the large-line energy welding property.
U.S. Patent application US4990196 (Building construct ion steel havingexcellent fire resistance and low yield ratio) discloses four kinds of structural steels with excellent fire performance and low yield strength ratio (shock resistance), the patented product main chemical compositions per-cent is: (1) C 0.04～0.015, Si≤0.60, Mn 0.50～1.60, Al≤0.10, Mo 0.40～0.70, N 0.001～0.006, Nb 0.005～0.040, and all the other are Fe and unavoidable impurities; (2) C 0.04～0.015, Si≤0.60, and Mn 0.50～1.60, Al≤0.10, Mo 0.40～0.70, and N 0.001～0.006, Nb 0.005～0.040, and in addition, also contain a kind of in the following composition at least: Ti 0.005～0.10, Zr 0.005～0.03, and V 0.005～0.10, and Ni 0.05～0.50, Cu 0.05～1.0, and Cr 0.05～1.0, and B 0.0003～0.002, Ca 0.0005～0.005, and REM 0.001～0.02, and all the other are Fe and unavoidable impurities; (3) C 0.04～0.015, Si≤0.60, and Mn 0.50～1.60, Al≤0.10, Mo 0.40～0.70, N≤0.006, all the other are Fe and unavoidable impurities; (4) C 0.04～0.015, Si≤0.60, and Mn 0.50～1.60, Al≤0.10, Mo 0.40～0.70, N≤0.006, in addition, also contain a kind of in the following composition at least: Nb 0.005～0.040, and Ti 0.005～0.10, Zr 0.005～0.03, and V 0.005～0.10, and Ni 0.05～0.50, Cu 0.05～1.0, and Cr 0.05～1.0, and B 0.0003～0.002, Ca 0.0005～0.005, and REM 0.001～0.02, and all the other are Fe and unavoidable impurities.This patent deficiency is that precious metal alloys elements Mo content is all higher in four kinds of chemical ingredientss, improved the alloying cost, limited use, and steel plate does not possess the large-line energy welding property, the welding efficiency of Plate Steel is low, engineering structure manufacturing cost height has limitation for the Plate Steel for building in the multiple area of Highrise buildings and earthquake.
The patent of Kawasaki, Japan application (JP08232043) " by hot rolling; air quickens cooling and forms ferrite; perlite and (or) bainite structure be used for shipbuilding; bridge; the large-line energy weldable steel of pressurized vessel etc. ", the patent (JP04346636) of Japan Nippon Steel application " contains C; Mn; P; S; Al; B, N, Ni and (or) HAZ of Cu has the high manganese super-high strength steel of flexible "; (JP2704810; JP06049586) " form the method that the MnS compound particles is made the large-line energy welding high-strength steel " by the complete deoxidation of Al.Though above-mentioned three's weak point is that steel plate all possesses the large-line energy welding property, does not all possess fire performance and anti-seismic performance.
Patent US6315946 (Ultra low carbon bainitic weathering steel), patent CA2299344 (Weathering steel), patent US6187117 (Method of makingan as-rolled multi-purpose weathering steel plate and producttherefrom), patent TW426743B (Thermomechanically controlled processedhigh strength weathering steel with low yield/tensile ratio), patent 200510012897.0 (hot-rolling double-phase weather-resistant steel plate and manufacture method thereof) and patent 200510036889.X (a kind of technology of using bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate) all only relate to weathering steel, and be obviously different with steel grade of the present invention.
In addition, the fire-resistant Plate Steel of using of Nippon Steel's exploitation, its intensity is 400MPa, 490MPa level, is 2/3 of normal temperature standard value at 600 ℃ of high temperature lower yield strengths, also has anti-seismic performance, yield ratio≤80% simultaneously.This steel plate is used in Highrise buildings, has positive effect.But it is all higher that weak point also is precious metal alloys elements Mo, Cr content, improved the alloying cost, and steel plate do not possess the large-line energy welding property.
Summary of the invention
The present invention is directed to existing building steel alloying cost height, do not possess the problem of big line amount welding property, fire performance, anti-seismic performance and bad mechanical property simultaneously, a kind of high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction and production method thereof are provided.The chemical ingredients of steel of the present invention is simple, and bullion content is low, and mechanical property is good, has excellent large-line energy welding property, fire performance and anti-seismic performance.
Described purpose is achieved by the following scheme:
A kind of high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction, one-tenth by following weight per-cent is grouped into: C 0.02～0.14%, Si 0.10～0.60%, Mn 0.60～1.80%, P≤0.020%, S≤0.010%, Nb 0.020～0.040%, and Ti 0.005～0.030%, and Cr 0.05～0.15%, Mo0.05～0.15%, N 0.0020～0.0055% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies:
(1) 4.0C+Mn≤2.0, (2) 0.30 〉=Cr+Mo 〉=0.15, (3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
Further, described high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction is grouped into by the one-tenth of following weight per-cent: C 0.02～0.08%, Si 0.27～0.60%, Mn 0.60～1.43%, P≤0.020%, S≤0.010%, Nb 0.038%～0.040, and Ti 0.015～0.028%, and Cr 0.10～0.15%, Mo 0.06～0.10%, N 0.0036～0.0050% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies simultaneously:
(1)4.0C+Mn≤2.0
(2)0.30≥Cr+Mo≥0.15
(3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
Further, described high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction is by the compound adding of the composition of following weight per-cent: C 0.09～0.14%, Si 0.23～0.27%, Mn 1.43～1.47%, Nb 0.023～0.027%, Ti 0.012～0.015%, P≤0.020%, S≤0.010%, Cr 0.05～0.12%, Mo 0.10～0.13%, N 0.0028～0.0033% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies simultaneously:
(1)4.0C+Mn≤2.0
(2)0.30≥Cr+Mo≥0.15
(3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
The production method of this high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction may further comprise the steps: desulfurizing iron-converter smelting-vacuum-treat-continuous casting-strand cleaning-strand heating-controlled rolling and controlled cooling-finishing; Concrete parameter is controlled to be: start rolling temperature 〉=1180 ℃, and three roads, controlled rolling end accumulative total draft 〉=35%, finishing temperature≤860 ℃, speed of cooling 〉=5 ℃/s, steel plate returns red temperature≤700 ℃, and then control is chilled to room temperature.
The present invention has the following advantages:
1) steel of the present invention possesses excellent resistivity against fire, R
EL(600 ℃ of high-temperature yield strengths) 〉=2/3R
EL(normal temperature yield strength standard value).
2) steel of the present invention possesses low yield tensile ratio (yield tensile ratio R
EL/ R
m≤ 0.80), anti-seismic performance is good.
3) steel carbon equivalent of the present invention is lower, the welding property excellence, have high Z to performance and can bear large-line energy (〉=100kJ/cm) welding, can simplify weldprocedure, significantly reduce welding labour intensity and welding cost, increase substantially the welding efficiency and the construction speed of Plate Steel product, adapt to big production requirement.
4) tempering of the present invention is learned simple, substitute single Nb microalloying with the Ti-V-Nb combined microalloying, effectively reduce controlled rolling steel plate yield tensile ratio, make steel plate obtain good shock resistance, simultaneously, utilize compound precipitation strength and the precipitation strength of Ti-V-Nb, significantly reduce the content of precious metal Mo, Cr etc., improve 600 ℃ of high-temperature yield strengths, make steel plate obtain the good fire resistance energy; On the other hand, utilize the composite oxides of Ti-Ca-Mg to improve the HAZ obdurability, obtain Chinese People's Anti-Japanese Military and Political College's heat input (〉=100kJ/cm) welding property.In addition, by reducing carbon content and special microalloying means, improve the purity of steel, thereby guarantee that this steel has good low-temperature flexibility.
5) production method of steel of the present invention is controlled easily, and is simple to operate, and production cost is low, is fit to scale production.
6) steel of the present invention can be widely used in steel buildings such as all kinds of high levels, superelevation layer, large span, the light light plate of steel, also can be applicable on rail vehicle manufacturing, shipbuilding and other steel member, and its application prospect is very wide.
7) steel of the present invention is applied to engineering construction, can improve in-situ production environment, improves operating efficiency, ensures construction quality, can create bigger direct and indirect economic effect, and have good social benefit.
Embodiment
Steel of the present invention is a kind of high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction, and its production method may further comprise the steps: desulfurizing iron-converter smelting-vacuum-treat-continuous casting-strand cleaning-strand heating-controlled rolling and controlled cooling-finishing.The concrete grammar of present embodiment is: according to composition of steel requirement of the present invention, six batches of steel of the present invention have been smelted at vacuum induction furnace, be respectively steel 1～steel 6, steel ingot is heated to 1280 ℃ comes out of the stove rolling, the start rolling temperature of steel 1～steel 6 is followed successively by 1180 ℃, 1200 ℃, 1220 ℃, 1190 ℃, 1210 ℃, 1220 ℃, last three passages accumulative total draft 35%～40%, finishing temperature is respectively 820 ℃, 840 ℃, 860 ℃, 850 ℃, 865 ℃, 830 ℃, carry out the laminar flow cooling after rolling, steel plate returns red temperature and is respectively 660 ℃, 640 ℃, 620 ℃, 690 ℃, 650 ℃, 675 ℃.Rolled sheet material thickness is 16mm, 20mm, 24mm, 22mm, 18mm, 24mm respectively.
The chemical ingredients of steel 1～steel 6 sees Table 1, and various performances see Table 2.
In order to reflect the various feature performance benefits of steel of the present invention, 3 groups of comparative steel are provided in the present embodiment, its chemical ingredients sees Table the comparative steel 1,2 and 3 in 1, and the various performances of comparative steel see Table the comparative steel 1,2 and 3 in 2.
The chemical ingredients (Wt%) of table 1 steel of the present invention and comparative steel
The performance of table 2 steel of the present invention and comparative steel
In the table 2,2/3 normal temperature standard R
ELBe 2/3 of standard-required yield strength; The Charpy V-notch toughness of steel plate when steel plate toughness is-20 ℃; The Charpy V-notch toughness of HAZ when HAZ toughness is-20 ℃ of 120kJ/cm large-line energy thermal analogy welding backs.
As can be seen from Table 2, steel room temperature tensile strength R of the present invention
mWith compared steel in same level, but yield strength R
ELBe starkly lower than compared steel, therefore, invention steel yield tensile ratio significantly is lower than compared steel, and level in kind has guaranteed that all below 0.70 steel of the present invention has good shock resistance; Though compared steel normal temperature yield strength is higher than the invention steel, but its 600 ℃ of high-temperature yield strengths are lower than the invention steel, do not reach 2/3 of standard-required yield strength, do not possess resistivity against fire, and 600 ℃ of high-temperature yield strengths of invention steel possess good fire resistance far above 2/3 of standard-required yield strength; In addition, before 120kJ/cm large-line energy welding heat simulation test, the impelling strength of invention steel-20 ℃ and compared steel are in same level-20 ℃ impelling strength, but after the simulation of 120kJ/cm large-line energy welding heat, and the HAZ impelling strength of invention steel-20 ℃ is higher than compared steel far away.
Above-mentioned is detailed description for most preferred embodiment processing step of the present invention; the researchist in the technology of the present invention field can do the change of form and content aspect unsubstantiality and not depart from the scope that institute of the present invention essence is protected according to above-mentioned step; therefore, the present invention is not limited to above-mentioned concrete embodiment.
Claims (4)
1. high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction, it is characterized in that being grouped into by the one-tenth of following weight per-cent: C 0.02～0.14%, Si 0.10～0.60%, Mn 0.60～1.80%, P≤0.020%, S≤0.010%, Nb 0.020～0.040%, and Ti 0.005～0.030%, and Cr 0.05～0.15%, Mo 0.05～0.15%, N 0.0020～0.0055% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies simultaneously:
(1)4.0C+Mn≤2.0
(2)0.30≥Cr+Mo≥0.15
(3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
2. a kind of high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction according to claim 1, it is characterized in that being grouped into by the one-tenth of following weight per-cent: C 0.02～0.08%, Si 0.27～0.60%, Mn 0.60～1.43%, P≤0.020%, S≤0.010%, Nb 0.038%～0.040, and Ti 0.015～0.028%, and Cr 0.10～0.15%, Mo 0.06～0.10%, N 0.0036～0.0050% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies simultaneously:
(1)4.0C+Mn≤2.0
(2)0.30≥Cr+Mo≥0.15
(3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
3. a kind of high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction according to claim 1, it is characterized in that by the compound adding of the composition of following weight per-cent: C 0.09～0.14%, Si 0.23～0.27%, Mn 1.43～1.47%, Nb 0.023～0.027%, Ti 0.012～0.015%, P≤0.020%, S≤0.010%, Cr 0.05～0.12%, Mo 0.10～0.13%, N 0.0028～0.0033% and V≤0.05%, Ca≤0.010%, two or more in Mg≤0.010%, all the other inevitably are mingled with for Fe reaches, and above-mentioned chemical ingredients satisfies simultaneously:
(1)4.0C+Mn≤2.0
(2)0.30≥Cr+Mo≥0.15
(3) carbon equivalent ce (%)=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14≤0.38.
4. the production method of each described high strength, high heat input welding property, fire resistant and earthquake resistant steel for construction of claim 1-3, may further comprise the steps: desulfurizing iron-converter smelting-vacuum-treat-continuous casting-strand cleaning-strand heating-controlled rolling and controlled cooling-finishing, it is characterized in that concrete parameter is controlled to be: start rolling temperature 〉=1180 ℃, three roads, controlled rolling end accumulative total draft 〉=35%, finishing temperature≤860 ℃, red temperature≤700 ℃ are returned in speed of cooling 〉=5 ℃/s, steel plate, and then control is chilled to room temperature.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775541B (en) * | 2010-03-09 | 2012-01-11 | 武汉钢铁(集团)公司 | Quake-proof construction steel with yield strength of 160MPa and production method thereof |
| JP5565531B2 (en) | 2011-12-15 | 2014-08-06 | 新日鐵住金株式会社 | High strength extra thick H-section steel |
| CN102560247A (en) * | 2012-01-19 | 2012-07-11 | 武汉钢铁(集团)公司 | Excellent-performance medium plate high-input-energy steel and smelting method thereof |
| CN102605287B (en) * | 2012-03-09 | 2013-07-31 | 武汉钢铁(集团)公司 | Steel for high-ductility anti-seismic structure with yield ratio smaller than or equal to 0.70 and production method of steel |
| CN104487604B (en) * | 2012-11-26 | 2016-11-02 | 新日铁住金株式会社 | H-shaped steel and its manufacturing method |
| 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 |
| CN104846287A (en) * | 2015-05-30 | 2015-08-19 | 广西盛隆冶金有限公司 | HRB400 antiseismic corrosion-resistant steel bar |
| CN108441764A (en) * | 2018-04-02 | 2018-08-24 | 首钢集团有限公司 | Cu nanometers of precipitation ultra-high strength steel plates of a kind of richness and preparation method thereof |
| CN113604735B (en) * | 2021-07-20 | 2022-07-12 | 山东钢铁股份有限公司 | Hot-rolled low-temperature-resistant H-shaped steel with yield strength of 420MPa and preparation method thereof |
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| WO2005075693A1 (en) * | 2004-02-05 | 2005-08-18 | Edelstahlwerke Südwestfalen Gmbh | Steel for producing high tensile structural components with excellent toughness at low temperatures and uses of such a steel |
| JP2006118007A (en) * | 2004-10-22 | 2006-05-11 | Kobe Steel Ltd | High strength steel having excellent toughness in weld heat affected zone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005075693A1 (en) * | 2004-02-05 | 2005-08-18 | Edelstahlwerke Südwestfalen Gmbh | Steel for producing high tensile structural components with excellent toughness at low temperatures and uses of such a steel |
| JP2006118007A (en) * | 2004-10-22 | 2006-05-11 | Kobe Steel Ltd | High strength steel having excellent toughness in weld heat affected zone |
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