CN101775536A - 225MPa earthquake-proof low yield strength steel and manufacturing method thereof - Google Patents
225MPa earthquake-proof low yield strength steel and manufacturing method thereof Download PDFInfo
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- CN101775536A CN101775536A CN200910056838A CN200910056838A CN101775536A CN 101775536 A CN101775536 A CN 101775536A CN 200910056838 A CN200910056838 A CN 200910056838A CN 200910056838 A CN200910056838 A CN 200910056838A CN 101775536 A CN101775536 A CN 101775536A
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Abstract
The invention provides earthquake-proof low yield strength steel and steel plate, characterized by containing the components in percentage by weight: at most 0.05 percent of C, at most 0.10 percent of Si, at most 1.0 percent of Mn, at most 0.01 percent of P, at most 0.006 percent of S, 0.01-0.05 percent of Al, at most 0.005 percent of N, 0.01-0.10 percent of Ti and the balance of Fe and unavoidable impurities. The invention also provides a manufacturing method of the steel plate, comprising the working procedures of heating steel billets, hot rolling and heat treatment after rolling. The steel is designed by adopting the component of ultra-low C, low Si and Mn and adding one or more than one of Ti, Nb or V, is produced by adopting a way of hot rolling at high temperature or hot rolling and normalizing, and has simple production process and lower cost. The steel has excellent impact resistance and welding property, low cycle fatigue property and very high elongation in addition to have low yield strength and is mainly used for the earthquake-proof design of building structures.
Description
Technical field
The present invention relates to field of iron and steel, specifically, the present invention relates to a kind of earthquake-proof low yield strength steel.
Background technology
Along with the development of building aseismicity technology, the energy dissipating anti-seismic technology is because its good anti seismic efficiency becomes the developing direction of Anti-quake Architectural Structure Design, and being used to make the low-yield steel of building the energy dissipating deoscillator has become the new steel grade of antidetonation with steel.A plurality of patents of invention about the building earthquake-resistance low-yield steel had been arranged, as disclosed patent documentation JP05214442A (production of low yield strength high-elongation structure iron) in 1993, disclosed patent documentation JP06235042A (ultralow yield-point steel) in 1994, disclosed patent documentation JP10001741A (low-yield structure iron and production thereof) in 1998 and JP10324918A (structure with the manufacturing of low yield point steel plate) with high-elongation before the present invention.It is lower that these patent documentations all relate to yield strength, the structural low that unit elongation is higher, can absorb seismic energy by the yield deformation of plastic zone and realize shockproof purpose, in composition design, serve as that trace alloying element is added on the basis, with the reduction yield strength with extremely low carbon (C)-silicon (Si)-manganese (Mn).
In addition, disclosed patent documentation JP09310118A (production of the low-yield steel that toughness is good), JP10324918A in 1997 (structure with the manufacturing of low yield point steel plate) and JP09227936A (production of low-yield Structural Steel Plate) also relate to low-yield antidetonation steel, the composition design of trace alloying element is added in employing on the basis of low C-Si-Mn, but has also added in copper (Cu), chromium (Cr), nickel (Ni) and the compositions such as molybdenum (Mo) and B one or more in addition respectively; Its yield strength is generally below 150MPa.
Disclosed patent documentation JP11229076 (the low-yield steel that toughness is good) in 1999 and JP11012650A (production of the low-yield steel that toughness is good) also relate to the earthquake-resistance low-yield steel, and wherein Si, Mn content are higher, and have added B; Its yield strength is 110MPa-250MPa, a wider range.
2007 disclosed patent documentation JP2007146248 (low-yield Plate Steel and manufacture method thereof that low-temperature flexibility and unit elongation are good) low yield point steel plate and the production method thereof of a kind of thickness more than 30mm disclosed, have the advantages that low-temperature flexibility is good, unit elongation is high, its yield strength is 225 ± 20MPa.This steel is except selecting to add 0.005～0.05% Ti, 0.005～0.05% Nb, 0.005～0.05% vanadium (V) in composition design, also add in the zirconium (Zr) of 0.0003～0.0030% B, 0.05～0.30% Cr and 0.005～0.05% one or more, and needed to add 0.005～0.05% calcium (Ca) and 0.005～0.05% rare earth (Re).The interpolation of these elements has not only increased manufacture difficulty and manufacturing cost greatly, and is unfavorable for the welding of steel plate and the assurance of low temperature impact properties.In addition, also need carry out temper after this steel grade rolls, guarantee surface hardness below Hv95 700 ℃ or 730 ℃ of following temperature, and need be to surpass the cooling rate cooling of 3 ℃/s between 870 ℃-300 ℃ after rolling.This has increased the control difficulty of production cycle and production technique.
Disclosed patent documentation JP2000178677 (good-toughness, low-yield steel and production method thereof that the yield strain dependency is little) in 2000 and the related steel of disclosed patent documentation JP2004339548 (225MPa/235MPa level low-yield steel and production method thereof with excellent in toughness) in 2004 all adopt the compound added ingredients of lower C, Si, Mn and trace alloying element to design, and eliminate unnecessary C, nitrogen (N) atom in the steel.The adding of these alloying elements has improved the steel-making difficulty, and has increased manufacturing cost.In addition, the related steel of patent documentation JP2004339548 requires to roll the back and is lower than 2 ℃/s 400-700 ℃ of interval cooling rate, has prolonged the production cycle of steel plate.
The chemical ingredients of JP2007146248, JP2000178677, the related steel of JP2004339548, production technique and mechanical property contrast see Table 1.
The chemical ingredients of table 1JP2007146248, JP2000178677, the related steel of JP2004339548, production technique and mechanical property contrast
Summary of the invention
First aspect of the present invention provides a kind of earthquake-proof low yield strength steel, it is characterized in that, contain C by weight percentage :≤0.05%, Si :≤0.10%, Mn :≤1.0%, P :≤0.01%, S :≤0.006%, Al:0.01-0.05%, N :≤0.005%, all the other are Fe and unavoidable impurities.
Preferably, also contain Nb in the described steel: V≤0.05% :≤0.10% and Ti:0.01-0.10% in one or more.
Steel plate generally improves intensity by means such as solution strengthening, precipitation strength, dislocations strengthening and grain-boundary strengthenings.225MPa grade building earthquake-resistance of the present invention is very low with the yield strength of steel, in order effectively to reduce yield strength and to guarantee high unit elongation, good low-temperature flexibility and welding property, must reduce addition, the minimizing intensifying factor of alloying element as far as possible, realize the rational Match of each element.The qualification of the concrete chemical ingredients of steel of the present invention be the reasons are as follows:
C: by the solution strengthening meeting yield strength is raise, unit elongation reduces.According to the process for making of reality, should reduce its content as far as possible.Therefore, C content is advisable to be no more than 0.05%.
Si:Si is a deoxidant element, also is the solution strengthening element, and yield strength is raise, and unit elongation reduces, and should reduce the addition of Si as far as possible.Therefore, Si content is advisable to be no more than 0.10%.
Mn:Mn also is a strengthening element common in the steel, improves yield strength by solution strengthening, but can reduce unit elongation simultaneously.Therefore, Mn content is advisable to be no more than 1.0%.
P:P can improve intensity, and makes steel plate become fragile, influence toughness, should reduce the content of P in the steel as far as possible.Therefore, P content is advisable to be no more than 0.01%.
S:S can improve the yield strength of steel, but steel plate is become fragile, and reduces the low-temperature flexibility of steel.Therefore, S content is advisable to be no more than 0.006%.
Al:Al is the essential element of deoxidation, but can improve the intensity of steel simultaneously, must control its content within the specific limits.Therefore, the preferred 0.01-0.05% of Al content range.
The solid solution of N:N can significantly improve the intensity of steel, and unfavorable to toughness, the welding property of steel plate.Therefore, N content is advisable to be no more than 0.005%.
Ti:Ti is used for fixing C, N atom to reduce its inhibition to dislocation motion.Ti can form TiN → Ti successively in steel
4C
2S
2→ TiS and TiC eliminate in the steel C, N atom freely, thereby reduce yield strength.Particulate alligatoring such as TiC, TiN simultaneously make it lose the crystal boundary pinning effect, have increased grain-size, have reduced the grain-boundary strengthening effect.But more Ti can reduce the unit elongation of steel plate, therefore, and the preferred 0.01-0.10% of Ti content range.
Nb:Nb is the carbonitride forming element, can reduce the content of solid solution C, N in the steel equally, and can be before finish rolling crystal grain thinning, help the control of armor plate strength.But too much Nb improves the recrystallization temperature of steel, makes armor plate strength too high, reduction plasticity.Therefore, Nb content is advisable to be no more than 0.05%.
V:V combines generation VC with C in steel, eliminate the C atom of solid solution in the steel, and the VC particle that generates is thick evenly, can reduce the influence of VC to the steel plate yield strength.Its effect and Ti, Nb are similar.Therefore, V content is advisable to be no more than 0.1%.
Second aspect of the present invention provides the manufacture method of described steel plate, comprises steel billet heating, hot rolling and rolls the postcooling operation.
In one embodiment of the invention, in the described steel billet heating process the preferred 1120-1250 of billet heating temperature ℃.
In another embodiment of the invention, in the described hot-rolled process the preferred 850-950 of finishing temperature ℃.
In another embodiment of the invention, preferred water-cooled of described refrigerating work procedure or air cooling are to room temperature.
In another embodiment of the invention, behind described hot-rolled process, also comprise the normalizing operation, wherein normalizing temperature is preferably below 950 ℃.
Steel of the present invention adopt the composition design of the low Si-Mn of ultralow C-and select to add the Nb of Ti, 0-0.05% of 0.01-0.10% or the V of 0-0.1% in one or more, adopt the mode of high temperature hot rolling or hot rolling+normalizing to produce, production technique is simple, cost is lower.This steel also has good impact and welding property and low cycle fatigue property except yield strength is low, unit elongation is very high, is mainly used in the seismic design of building structure.
Beneficial effect of the present invention:
Steel of the present invention has good comprehensive mechanical property, and yield strength is between 205-245MPa, and unit elongation surpasses 40%, has good plastic deformation ability; And has 0 ℃ of good impelling strength.Be applicable to the seismic design of various buildings.
Steel of the present invention has good low cycle fatigue property, can bear the repeated deformation under the seismic waveshape load, by the viscous deformation absorption seismic energy of steel plate, the safety of protection main building.
Steel of the present invention has good welding property, and its low-carbon-equivalent composition design has guaranteed that steel plate has good welding property.
Steel of the present invention adopts the high temperature hot rolling, air cooling after rolling/be cooled to room temperature, perhaps normalizing treatment after the hot rolling.Production technique is simple, and cost is lower, is applicable to the scale operation of enterprise.
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
The chemical ingredients of the made steel billet of each embodiment of steel of the present invention sees Table 2, the gained steel billet is heated to more than 1120-1250 ℃, and finishing temperature 850-950 ℃, roll back air cooling/water-cooled to room temperature or hot rolling+normalizing, gained steel plate mechanical property sees Table 3.
The chemical ingredients (wt%) of the made steel billet of each embodiment of table 2 steel of the present invention
| Numbering | ??C | ??Si | ??Mn | ??P | ??S | ??Al | ??Nb | ??V | ??Ti | ??N |
| ??A | ??0.048 | ??0.003 | ??0.24 | ??0.007 | ??0.004 | ??0.016 | ??- | ??- | ??- | ??0.0031 |
| ??B | ??0.013 | ??0.004 | ??0.24 | ??0.008 | ??0.005 | ??0.034 | ??0.018 | ??- | ??- | ??0.0021 |
| ??C | ??0.013 | ??0.007 | ??0.24 | ??0.008 | ??0.003 | ??0.032 | ??0.019 | ??0.039 | ??- | ??0.0023 |
| ??D | ??0.016 | ??0.063 | ??0.32 | ??0.009 | ??0.004 | ??0.03 | ??0.03 | ??0.04 | ??0.013 | ??0.0021 |
| ??E | ??0.011 | ??0.007 | ??0.33 | ??0.010 | ??0.003 | ??0.05 | ??0.02 | ??- | ??0.011 | ??0.0020 |
| ??F | ??0.011 | ??0.008 | ??0.31 | ??0.010 | ??0.003 | ??0.04 | ??0.02 | ??0.04 | ??0.015 | ??0.0023 |
| ??G | ??0.018 | ??0.011 | ??0.32 | ??0.010 | ??0.006 | ??0.031 | ??0.04 | ??0.04 | ??0.021 | ??0.0018 |
The mechanical property of the made steel plate of each embodiment of table 3 steel of the present invention
| Composition | Thickness of slab mm | Finishing temperature ℃ | Roll postheat treatment | Yield strength ReL/Rp/MPa | Tensile strength Rm/MPa | Yield tensile ratio YR/% | Unit elongation A50/% | 0 ℃ of transverse impact merit Akv/J |
| ??A | ??6 | ??900 | Air cooling | ??235?216 | ??322?319 | ??73?68 | ??42?45 | ?120?126?126 |
| ??A | ??6 | ??950 | Air cooling | ??226?210 | ??312?313 | ??72?67 | ??43?43 | ?116?112?120 |
| ??A | ??15 | ??850 | Water-cooled | ??220?225 | ??324?325 | ??68?69 | ??56?56 | ?312?319?310 |
| ??B | ??15 | ??850 | Air cooling | ??245?241 | ??322?323 | ??76?75 | ??63?62 | ?309?321?318 |
| ??C | ??15 | ??900 | Air cooling | ??247?247 | ??320?319 | ??77?77 | ??60?61 | ?309?321?321 |
| ??D | ??25 | ??930 | Air cooling | ??207?214 | ??312?320 | ??66?67 | ??69?70 | ?285?295?309 |
| ??E | ??30 | ??870 | Air cooling | ??215?217 | ??312?313 | ??69?69 | ??72?73 | ?276?302?299 |
| ??F | ??30 | ??870 | Air cooling | ??206?213 | ??312?318 | ??66?67 | ??74?76 | ?297?302?306 |
| ??G | ??30 | ??850 | 930 ℃ of normalizings | ??238?244 | ??332?343 | ??72?71 | ??85?84 | ?315?313?320 |
| ??G | ??30 | ??900 | 930 ℃ of normalizings | ??230?229 | ??331?332 | ??70?69 | ??82?81 | ?320?306?306 |
| ??G | ??30 | ??950 | 930 ℃ of normalizings | ??229?229 | ??332?332 | ??69?69 | ??84?82 | ?233?231?291 |
As seen from Table 3, steel of the present invention has good yield strength, and yield strength is all within the scope of target call; Have good plasticity, unit elongation is all above 40%; Have good impact property, 0 ℃ full sample ballistic work is all more than 200J (the 6mm steel plate is half sample).
Steel of the present invention can be widely used in the seismic design of various buildings such as high level, high-rise building and large stadium, bridge and outdoor pylon, improves the anti-seismic performance of buildings.
Claims (7)
1. a steel is characterized in that, contains C by weight percentage :≤0.05%, and Si :≤0.10%, Mn :≤1.0%, P :≤0.01%, S :≤0.006%, Al:0.01-0.05%, N :≤0.005%, all the other are Fe and unavoidable impurities.
2. steel as claimed in claim 1 is characterized in that, also contains Nb in the described steel: V≤0.05% :≤0.10% and Ti:0.01-0.10% in one or more.
3. the manufacture method of the described steel of claim 1, comprise steel billet heating, hot rolling and roll the postcooling operation, it is characterized in that described steel plate contains C by weight percentage :≤0.05%, Si :≤0.10%, Mn :≤1.0%, P :≤0.01%, S :≤0.006%, Al:0.01-0.05%, N :≤0.005%, all the other are Fe and unavoidable impurities.
4. manufacture method as claimed in claim 3 is characterized in that, billet heating temperature is at 1120-1250 ℃ in the described steel billet heating process.
5. manufacture method as claimed in claim 3 is characterized in that, finishing temperature is 850-950 ℃ in the described hot-rolled process.
6. manufacture method as claimed in claim 3 is characterized in that, adopts water-cooled or air cooling to room temperature in the described refrigerating work procedure.
7. manufacture method as claimed in claim 3 is characterized in that, also comprises the normalizing operation behind hot-rolled process, and wherein normalizing temperature is controlled at below 950 ℃.
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| 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 |
| CN104233058A (en) * | 2014-09-30 | 2014-12-24 | 南京钢铁股份有限公司 | Ultralow cost low yield point steel and production method thereof |
| CN104561777A (en) * | 2014-11-26 | 2015-04-29 | 南京钢铁股份有限公司 | 225-grade low-yield-strength steel used in low-temperature harsh environment and production method thereof |
| CN105177419A (en) * | 2015-08-14 | 2015-12-23 | 河北钢铁股份有限公司 | Low-yield-strength anti-seismic steel plate for building and production method of steel plate |
| CN105483548A (en) * | 2016-01-15 | 2016-04-13 | 舞阳钢铁有限责任公司 | Low-cost low-yield-strength anti-knock steel and production method thereof |
| CN107574296A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of inexpensive 225MPa levels low-yield point damper steel plate and strip production methods |
| 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 |
| CN108728730A (en) * | 2017-04-24 | 2018-11-02 | 鞍钢股份有限公司 | A kind of 315MPa high-performance building structures mild steel and its manufacturing method |
| CN110100027A (en) * | 2016-12-21 | 2019-08-06 | 株式会社Posco | The steel plate and its manufacturing method of low yielding ratio with excellent low-temperature flexibility |
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| 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 |
| CN104233058A (en) * | 2014-09-30 | 2014-12-24 | 南京钢铁股份有限公司 | Ultralow cost low yield point steel and production method thereof |
| CN104233058B (en) * | 2014-09-30 | 2016-08-24 | 南京钢铁股份有限公司 | The Low Yield Point Steel of a kind of Ultra Low Cost and production method thereof |
| CN104561777A (en) * | 2014-11-26 | 2015-04-29 | 南京钢铁股份有限公司 | 225-grade low-yield-strength steel used in low-temperature harsh environment and production method thereof |
| CN105177419A (en) * | 2015-08-14 | 2015-12-23 | 河北钢铁股份有限公司 | Low-yield-strength anti-seismic steel plate for building and production method of steel plate |
| CN105483548A (en) * | 2016-01-15 | 2016-04-13 | 舞阳钢铁有限责任公司 | Low-cost low-yield-strength anti-knock steel and production method thereof |
| CN110100027A (en) * | 2016-12-21 | 2019-08-06 | 株式会社Posco | The steel plate and its manufacturing method of low yielding ratio with excellent low-temperature flexibility |
| CN110100027B (en) * | 2016-12-21 | 2021-10-15 | 株式会社Posco | Low yield ratio steel plate having excellent low temperature toughness and method for manufacturing same |
| CN108728730A (en) * | 2017-04-24 | 2018-11-02 | 鞍钢股份有限公司 | A kind of 315MPa high-performance building structures mild steel and its manufacturing method |
| CN107574296A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of inexpensive 225MPa levels low-yield point damper steel plate and strip production methods |
| 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 |
| 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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Open date: 20100714 |