CN102936683A - 370MPa-yield-strength bridge steel without plate thickness effect and production method thereof - Google Patents
370MPa-yield-strength bridge steel without plate thickness effect and production method thereof Download PDFInfo
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Abstract
The invention relates to a 370MPa-yield-strength bridge steel without plate thickness effect and a production method thereof. The bridge steel comprises the following components in percentage by weight: 0.10-0.16% of C, 0.025-0.50% of Si, 1.0-1.55% of Mn, at most 0.015% of P, at most 0.010% of S and 0.02-0.05% of Nb. The production method comprises the following steps: smelting and continuously casting into a blank by a clean steel technique; heating the casting blank; rolling; and cooling for later use. The invention has the advantages of fewer added alloy elements and simple rolling technique, and is easy to control; the maximum fluctuation value of the yield strength of the produced 10-80mm steel plates is less than or equal to 20MPa, especially the fluctuation value of the yield strength of the 50-80mm steel plates is less than or equal to 15MPa, and thus, the bridge steel almost has no plate thickness effect, and is easy for processing and use; and the bridge steel is especially suitable for splicing, welding and other processing modes for different steel plates, and can obtain even and uniform integral structure strength and higher safety performance.
Description
Technical field
The present invention relates to bridge steel plate and production method thereof, refer to particularly bridge steel plate and the production method thereof of yield strength 370MPa level, definitely applicable Bridge Steel and production method of producing steel plate thickness≤80mm, yield strength 370MPa level.
Background technology
Before 2009, Bridges in Our Country steel plate delivery technical qualification all are take standard GB/T/T714-2000 as foundation, and the admissible thickness of slab effect value of its regulation steel plate is larger---16mm is with lower steel plate R
ELThe Min value is 370MPa,＞16 ~ 35mm steel plate R
ELThe Min value is 355MPa,＞35mm steel plate R
ELThe Min value is 330MPa.Be accompanied by era development, the progress of science and technology, Bridge Design has adopted renewal, more scientific method of design, design is whole to large span, the lightness development, so that do not participate in the major portion that whole stressed decking have been used as trusses or case beam stress now originally, and each engineering can propose stricter index request according to the self-building characteristics, therefore country was from 1 day October in 2009, bridge steel plate begins to carry out national standard GB/T714-2008, this standard has been carried out larger adjustment with the admissible thickness of slab effect value of steel plate, after the adjustment is---and 50mm is with lower steel plate R
ELThe Min value is 370MPa,＞50mm steel plate R
ELThe Min value is 360MPa, can say that its thickness of slab effect is almost and does not have, also therefore, each big steel enterprise after implementing new standard its can produce the thickness specification than significantly atrophy of front existence because according to new mark, for 50mm with upper steel plate under original technique, its R
ELIt is qualified that value is difficult to, the slab of as-normalized condition delivery especially, and this brings very large impact to enterprise.Therefore improve Bridge Steel steel plate thickness of slab effect imperative.
At present, for guaranteeing the R of slab Bridge Steel
ELValue meets the requirement of new standard, and steel mill mostly adopts and adds alloy, improves the intensity index of steel plate in the mode of sacrificing cost, must pass through modifier treatment but its 80mm steel plate wants to reach 370MPa, and this has increased the cost of enterprise virtually.
Through preliminary search, China Patent No. is the patent documentation of CN 101318287A, and it discloses the production method that a kind of Q460MPa high-strong toughness bridge is used steel plate.The main component of this kind method is designed to 0.07 ~ 0.10% C, 0.025 ~ 0.045% Nb, 0.060 ~ 0.075% V and 0.005 ~ 0.015% Ti, rolling technology adopts two stage rolling, and the one-phase rolling temperature is 1000 ~ 1200 ℃, and the two-stage rolling temperature is 850 ~ 890 ℃, finishing temperature is 790 ~ 810 ℃, roll rear steel plate and take to control cold, final cooling temperature is 610 ~ 650 ℃, is organized as ferrite+perlite.Adopted Nb, V, three kinds of alloying elements of Ti in the related Composition Design of this patent, and content is higher, Nb content especially, so its manufacturing cost is too high; The performance index of only having shown in addition the 30mm steel plate in this patent, and the intensity difference maximum of stack pile steel plate reaches 45MPa, therefore can not illustrate that it does not have thickness effect.
China Patent No. is the patent documentation of CN 102400055A, and it discloses the controlled high-strength high-toughness steel plate of a kind of low-cost yield tensile ratio and manufacture method thereof.The main component of this kind method is designed to C:0.04～0.10%, Mn:1.2～2.0%, Si:0.1～0.5%, Nb:0.02～0.045%, Ti:0.005～0.025%, Cr:0.4～1.0%, Mo:0.08～0.25%, Als:0.010～0.050%.Rolling technology adopts two stage rolling, and the two-stage rolling temperature is 700 ~ 930 ℃, rolls rear steel plate and takes to control cold, and final cooling temperature is 200 ~ 250 ℃.At first adopted Nb, Ti, Cr, four kinds of alloying elements of Mo in the related Composition Design of this patent, and needed thermal treatment, so its manufacturing cost is too high; Secondly the rear final cooling temperature that rolls in this patent is 200 ~ 250 ℃, and this is unfavorable for the control of sheet panel top shape, and thickness can cross low so that thermal straightening machine can't be finished aligning by Yin Wendu, forces some factories that do not have cold straightener to produce; The steel plate of the method production is ferrite and bainite structure in addition, and the thickness of slab effect has reached 110MPa simultaneously.
China Patent No. is the patent documentation of CN 102337456A, and it discloses a kind of thick specification bridge steel plate and rolling method thereof.The main component of this kind method is designed to C:0.05～0.10%, Mn:1.1～1.5%, Si:0.25～0.45%, S :≤0.010%, P :≤0.018%, Nb:0.02～0.055%, Ti:0.006～0.025%, V:0.02～0.06%.Rolling technology adopts two stage rolling, and the one-phase rolling temperature is 1180 ~ 1230 ℃, and the two-stage rolling temperature is 890 ~ 920 ℃, and finishing temperature is 850 ~ 900 ℃, and the ACC final cooling temperature is 540 ~ 600 ℃, is applicable to produce 60 ~ 100mm Plate Steel.At first adopted Nb, V, three kinds of alloying elements of Ti in the related Composition Design of this patent, and content is higher, so its manufacturing cost is too high; Secondly the method is only applicable to 60 ~ 100mm Plate Steel, does not have the specification spreadability.The thickness of slab effect of the steel plate of the method production has reached 75MPa in addition.
Summary of the invention
The purpose of this invention is to provide and a kind ofly satisfying its R
ELUnder the prerequisite of value 〉=370MPa, chemical composition is simple, and production cost is low, and technique is simple, Bridge Steel and the production method thereof without the thickness of slab effect of the yield strength difference≤20MPa between the steel plate in the thickness of slab of producing≤80mm scope.
Realize the measure of above-mentioned purpose:
Yield strength 370MPa level is without the Bridge Steel of thickness of slab effect, and its component and weight percent content are: C:0.10～0.16%, Si:0.025～0.50%, Mn:1.20～1.55%, P :≤0.015%, S :≤0.010%, Nb:0.02～0.05%, all the other inevitably are mingled with for Fe reaches.
The production yield strength be the 370MPa level without the method for the Bridge Steel of thickness of slab effect, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the strand heating, heating and temperature control is 1050～1250 ℃, and heating rate is controlled to be 9 ~ 11mm/min;
3) carry out segmentation rolling: control roughing finishing temperature is not less than 1050 ℃, and extreme trace time draught is at least 20%; Final rolling temperature needs to determine according to thickness of slab, and namely to less than 25mm the time, control finish rolling start rolling temperature is at 960～1000 ℃ at 10mm for steel plate thickness; To less than 40mm the time, control finish rolling start rolling temperature is at 910～950 ℃ at 25mm for steel plate thickness; To less than 60mm the time, control finish rolling start rolling temperature is at 880～900 ℃ at 40mm for steel plate thickness; Steel plate thickness is when 60～80mm, and control finish rolling start rolling temperature is at 850～870 ℃;
4) cool off, the steel plate final cooling temperature is 500～700 ℃; Exist according to thickness of slab control speed of cooling: to less than 25mm the time, the control speed of cooling is at 6 ± 1 ℃/S at 10mm for steel plate thickness; To less than 40mm the time, the control speed of cooling is at 10 ± 1 ℃/S at 25mm for steel plate thickness; To less than 60mm the time, the control speed of cooling is at 13 ± 1 ℃/S at 40mm for steel plate thickness; Steel plate thickness is when 60～80mm, and the control speed of cooling is at 18 ± 1 ℃/S;
5) stand-by.
The function and mechanism of each element and main technologic parameters among the present invention:
The element aspect:
C: carbon is intensity element main in the steel, increases the intensity that carbon can increase substantially steel, and when content surpassed 0.18%, the low-temperature flexibility of steel significantly worsened, and therefore is controlled at 0.10～0.16%.
Si: silicon is the bioelement of deoxidation in steel making, also has certain strengthening effect, when content is lower than 0.1, smelts difficulty and strengthens; When content surpassed 0.5%, the cleanliness factor of steel reduced, and toughness and welding property descend, and temper brittleness strengthens, and therefore was controlled at 0.25 ~ 0.50%.
Mn: reduce the lower change point of steel, increase the condensate depression of austenite cooling, the refine pearlite tissue, and improve its mechanical property, can obviously improve the hardening capacity of steel, but when content is high, with reducing the low-temperature flexibility of steel, therefore be controlled at 1.0 ~ 1.55%.
Nb: niobium can significantly improve the austenite recrystallization temperature of steel, enlarges non-recrystallization district scope, is convenient to realize high temperature rolling.Niobium can also suppress Austenite Grain Growth, has significantly refined crystalline strengthening and precipitation strength effect.
Als: aluminium is deoxidant element, can form AlN with N, but crystal grain thinning, when it contains quantity not sufficient 0.015%, poor effect, when surpassing 0.05%, it is saturated that desoxydatoin is tending towards, and increases steel inclusion.Therefore be controlled at 0.015 ~ 0.040%.
P: phosphoric increases temper brittleness and cold short susceptibility.
S: element sulphur increases the red brittleness of steel, and is when sulphur content is high, unfavorable to welding property.
The main technique aspect:
Determining of roughing technique: be that austenite recrystallization temperature is interval more than 1050 ℃, therefore the roughing terminal temperature should be not less than 1050 ℃, it is to guarantee that austenitic crystal grain is fully broken that the draft of control rough rolling step extreme trace time is not less than 20% purpose, and the austenitic crystal grain section can guarantee fragmentation under finishing temperature after fully grows up.
Determining of finish-rolling process: determine finish rolling open rolling technique according to different plate thickness, to guarantee that different steel plate thickness obtain different grain refining grades, dwindle gap between thin plate and the slab, namely under identical finish rolling rolling technology, the thin plate overall compression ratio is larger, the comparatively tiny intensity of rolling crystal grain itself is no doubt higher, the slab overall compression ratio is little, the insufficient intensity of grain refining is relatively low, therefore different thicknesss of slab is taked different finish-rolling process, thin plate takes the high-temperature zone rolling, so that roll rear crystal grain certain interval that reaches is arranged, and slab is taked low temperature rolling, the control grain growth, can suppress equally in addition the effect of solution strengthening effect on slab and thin plate of Nb, so that thin plate is close with slab intensity, reduce the thickness of slab benefit.
Determining of process for cooling: the method for this invention is to belong to a kind of low-cost manufacturing technique, and the Nb alloy is only arranged in the steel, therefore need to take to roll rear acceleration cooling, makes to obtain preferably intensity to meet the requirements under the condition of microalloy.But different thicknesss of slab has larger difference to the sensitivity of cooling intensity, because of the rolling intensity of thin plate itself relatively higher, therefore need to take weak cold water, its meaning is to guarantee the impact of steel plate, slab adopts strong cold water, impel the further refinement of crystal grain, improve intensity, dwindle the intensity difference of thin plate and slab.
The present invention compared with prior art, its characteristics:
1, the yield strength that the present invention produces steel plate thickness≤80mm bridge steel plate is at least 370MPa;
The alloying element that adds when 2, steel plate of the present invention is smelted only is Nb, and content is less, causes production cost lower;
3, the steel plate rolling technique produced of the present invention is simple, and is easy to control;
4, the yield strength maximum fluctuation value≤20MPa of 10 ~ 80mm steel plate of producing of the present invention, the yield strength undulating quantity≤15MPa of 50 ~ 80mm steel plate especially is almost without the thickness of slab effect.
5, the steel plate produced of the present invention is minimum because of the thickness of slab effect, and the processing that therefore is easy to steel plate is used, and is specially adapted to the processing modes such as assembly unit, welding of different steel plates, can be so that unitary construction even intensity, consistent, and safety performance is higher.
Embodiment
Embodiment 1: the steel sheet product thickness of production is 20 millimeters
:
Its component and weight percent content are: C:0.110%, Si:0.34%, Mn:1.28%, P:0.013%, S:0.002%, Nb:0.024%, surplus is Fe and inevitably is mingled with.
Production stage:
1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades;
2) strand heating, Heating temperature is 1055 ~ 1065 ℃, heating rate is 9.2mm/min;
3) be rolled: the roughing finishing temperature is at 1070 ~ 1080 ℃, and extreme trace time draught is 21%; Because steel sheet product thickness is 20 millimeters
,Therefore the finish rolling open rolling is at 970 ~ 980 ℃;
4) cooling off, is to be cooled to 505 ~ 515 ℃ under the 6 ℃/S in speed of cooling;
5) stand-by.
Detect, yield strength 392MPa, tensile strength 551MPa, unit elongation 27.5% ,-20 ℃ of ballistic work 246J, the d=3a clod wash is qualified.
Embodiment 2: the product steel plate thickness of production is 30 millimeters
:
Its component and weight percent content are: C:0.131%, Si:0.30%, Mn:1.33%, P:0.014%, S:0.004%, Nb:0.021%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades;
2) strand heating, Heating temperature is at 1095 ~ 1105 ℃, and heating rate is 9.8mm/min;
3) be rolled: the roughing finishing temperature is at 1090 ~ 1100 ℃, and extreme trace time draught is 23% because steel sheet product thickness is 30 millimeters
,The finish rolling open rolling is at 915 ~ 925 ℃;
4) cooling off, is to be cooled to 585 ~ 595 ℃ under the 10 ℃/S in speed of cooling;
5) stand-by.
Detect, yield strength 398MPa, tensile strength 549MPa, unit elongation 25.5% ,-20 ℃ of ballistic work 273J, the d=3a clod wash is qualified.
Embodiment 3: the product steel plate thickness of production is 44 millimeters
:
Its component and weight percent content are: C:0.129%, Si:0.32%, Mn:1.42%, P:0.015%, S:0.003%, Nb:0.023%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades;
2) strand heating, Heating temperature is 1121 ~ 1130 ℃, heating rate is 10.5mm/min;
3) be rolled: the roughing finishing temperature is at 1120 ~ 1130 ℃, and extreme trace time draught is 22.5%; Because steel sheet product thickness is 44 millimeters
,The finish rolling start rolling temperature is at 890 ~ 900 ℃;
4) cooling off, is to be cooled to 585 ~ 595 ℃ under the 13 ℃/S in speed of cooling;
5) stand-by.
Detect, yield strength 393MPa, tensile strength 555MPa, unit elongation 25.5% ,-20 ℃ of ballistic work 273J, the d=3a clod wash is qualified.
Embodiment 4: steel sheet product thickness is 60 millimeters
Its component and weight percent content are: C is 0.144%, Si is 0.32%, Mn is 1.47%, P is 0.012%, S is 0.006%, Nb is 0.025%, and surplus is Fe and inevitably is mingled with.
Its production stage:
1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades;
2) strand heating, Heating temperature is 1185 ~ 1195 ℃, heating rate is 9.8mm/min;
3) be rolled: the roughing finishing temperature is at 1125 ~ 1135 ℃, and extreme trace time draught is 24%; Because steel sheet product thickness is 60 millimeters
,The finish rolling start rolling temperature is at 850 ~ 860 ℃;
4) cooling off, is to be cooled to 585 ~ 595 ℃ under the 17 ℃/S in speed of cooling;
5) stand-by.
Detect, yield strength 397MPa, tensile strength 560MPa, unit elongation 24% ,-20 ℃ of ballistic work 221J, the d=3a clod wash is qualified.
Embodiment 5: steel plate thickness is 80 millimeters
Its component and weight percent content are: C is 0.154%, Si is 0.35%, Mn is 1.46%, P is 0.015%, S is 0.003%, Nb is 0.024%, and surplus is Fe and inevitably is mingled with.
Its production stage:
1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades;
2) strand heating, Heating temperature is 1235 ~ 1245 ℃, heating rate is 10.9mm/min;
3) be rolled: the roughing finishing temperature is at 1195 ~ 1205 ℃, and extreme trace time draught is 26%; Because steel sheet product thickness is 80 millimeters
,The finish rolling start rolling temperature is at 860 ~ 870 ℃;
4) cooling off, is to be cooled to 680 ~ 690 ℃ under the 19 ℃/S in speed of cooling;
5) stand-by.
Detect, yield strength 401MPa, tensile strength 559MPa, unit elongation 25.5% ,-20 ℃ of ballistic work 238J, the d=3a clod wash is qualified.
Can find out from 5 above-mentioned embodiment, thickness is that the steel plate yield strength of 20mm is 392MPa, and thickness is that the steel plate yield strength of 80mm is 401MPa, and difference between the two only has 9 MPa.Illustrate that there is not the thickness effect problem in the steel plate of thickness in the 80mm scope that adopts the present invention to produce.It has good welding property in use, and formability is stable, indeformable.
Comparative Examples: under identical chemical composition, adopt 4 kinds of product steel plate thickness, namely be respectively 22,32,50,64 millimeters, process using has Technology now
Chemical composition:
Component and weight percent content are: C is 0.131%, Si is 0.33%, Mn is 1.42%, P is 0.013%, S is 0.005%, Nb is 0.026%, and surplus is Fe and inevitably is mingled with.
Its production stage: 1) smelting also according to clean steel process, continuous casting becomes base; In the smelting, control inside steel billet A, B, C, D type impurity total amount are no more than 1.5 grades; 2) strand heating, soaking temperature is 1180 ~ 1193 ℃, heating rate is 9.1 ~ 10.5mm/min; 3) be rolled: the roughing finishing temperature is at 1050 ~ 1120 ℃, and the finish rolling open rolling is at 900 ~ 1000 ℃; 4) cool off, speed of cooling is 12 ℃/S;
The mechanics detected result:
Thickness is 22mm's: yield strength 441MPa, and tensile strength 585MPa, unit elongation 21.5% ,-20 ℃ of ballistic work 120J, the d=3a clod wash is qualified.
Thickness is 32mm's: yield strength 420MPa, and tensile strength 570MPa, unit elongation 22.5% ,-20 ℃ of ballistic work 143J, the d=3a clod wash is qualified.
Thickness is 50mm's: yield strength 388MPa, and tensile strength 553MPa, unit elongation 25.5% ,-20 ℃ of ballistic work 176J, the d=3a clod wash is qualified.
Thickness is 64mm's: yield strength 372MPa, and tensile strength 545MPa, unit elongation 29.5% ,-20 ℃ of ballistic work 206J, the d=3a clod wash is qualified.
Steel plate mechanics detection case from 4 different thickness of Comparative Examples, the yield strength of the 22mmm that it is the thinnest is 441MPa, the thickest 64mm yield strength is 372MPa, difference between the two reaches 69 MPa, minimum difference is enough to the existence of the steel plate thickness effect of its Comparative Examples also greater than 15 MPa.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (2)
1. yield strength 370MPa level is without the Bridge Steel of thickness of slab effect, and its component and weight percent content are: C:0.10～0.16%, Si:0.025～0.50%, Mn:1.20～1.55%, P :≤0.015%, S :≤0.010%, Nb:0.02～0.05%, all the other inevitably are mingled with for Fe reaches.
2. produce yield strength 370MPa level as claimed in claim 1 without the method for the Bridge Steel of thickness of slab effect, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the strand heating, heating and temperature control is 1050～1250 ℃, and heating rate is controlled to be 9 ~ 11mm/min;
3) be rolled: control roughing finishing temperature is not less than 1050 ℃, and extreme trace time draught is at least 20%; Final rolling temperature needs to determine according to thickness of slab, and namely to less than 25mm the time, control finish rolling start rolling temperature is at 960～1000 ℃ at 10mm for steel plate thickness; To less than 40mm the time, control finish rolling start rolling temperature is at 910～950 ℃ at 25mm for steel plate thickness; To less than 60mm the time, control finish rolling start rolling temperature is at 880～900 ℃ at 40mm for steel plate thickness; Steel plate thickness is when 60～80mm, and control finish rolling start rolling temperature is at 850～870 ℃;
4) cool off, the steel plate final cooling temperature is 500～700 ℃; Exist according to thickness of slab control speed of cooling: to less than 25mm the time, the control speed of cooling is at 6 ± 1 ℃/S at 10mm for steel plate thickness; To less than 40mm the time, the control speed of cooling is at 10 ± 1 ℃/S at 25mm for steel plate thickness; To less than 60mm the time, the control speed of cooling is at 13 ± 1 ℃/S at 40mm for steel plate thickness; Steel plate thickness is when 60～80mm, and the control speed of cooling is at 18 ± 1 ℃/S;
5) stand-by.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106222548A (en) * | 2016-07-25 | 2016-12-14 | 武汉钢铁股份有限公司 | The low yield strength ratio structural steel for bridge of normalizing rolling and production method thereof |
| CN112359191A (en) * | 2020-11-10 | 2021-02-12 | 江苏省沙钢钢铁研究院有限公司 | TMCP type bridge steel plate with small same-plate strength difference and production method thereof |
| CN114134415A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | Low-temperature high-toughness low-alloy medium-thickness steel plate and preparation method thereof |
| CN114622135A (en) * | 2022-02-21 | 2022-06-14 | 柳州钢铁股份有限公司 | Micro-niobium alloyed Q355B low-alloy high-strength structural steel plate and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222548A (en) * | 2016-07-25 | 2016-12-14 | 武汉钢铁股份有限公司 | The low yield strength ratio structural steel for bridge of normalizing rolling and production method thereof |
| CN106222548B (en) * | 2016-07-25 | 2017-11-10 | 武汉钢铁有限公司 | The low yield strength ratio structural steel for bridge and its production method of normalizing rolling |
| CN112359191A (en) * | 2020-11-10 | 2021-02-12 | 江苏省沙钢钢铁研究院有限公司 | TMCP type bridge steel plate with small same-plate strength difference and production method thereof |
| CN112359191B (en) * | 2020-11-10 | 2022-04-19 | 江苏省沙钢钢铁研究院有限公司 | TMCP type bridge steel plate with small same-plate strength difference and production method thereof |
| CN114134415A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | Low-temperature high-toughness low-alloy medium-thickness steel plate and preparation method thereof |
| CN114622135A (en) * | 2022-02-21 | 2022-06-14 | 柳州钢铁股份有限公司 | Micro-niobium alloyed Q355B low-alloy high-strength structural steel plate and manufacturing method thereof |
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| CN102936683B (en) | 2014-08-06 |
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