CN103173679A - 100mm Q460qE bridge steel plate and production method thereof - Google Patents
100mm Q460qE bridge steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a 100mm Q460qE bridge steel plate of which the yield strength is controlled to be 470-500MPa, the extension strength is controlled to be 580-620MPa, the elongation is controlled to be 20-24%, and the -40 DEG C V type ballistic work is controlled to be 170-210J. The production method comprises the following process procedures: pretreatment of high-quality molten iron and KR molten iron, converter smelting, argon blowing treatment, LF refining, VD refining, die casting, casting blank pile cooling, casting blank heating, rolling by using rolling mill and the like. Through reasonable chemical component design and combination of LF and VD processes, the cleanliness of the steel is ensured; and further through the effective implementation of processes of heating, rolling, thermal refining and the like, the 100mm Q460qE bridge steel plate is successfully realized and has a bainite of which the volume fraction is 75-85%, martensite of which the volume fraction is 15-25% and ferrite of which the volume fraction is 1-6%; in addition, the yield strength is controlled to be 470-500MPa; the tensile strength is controlled to be 580-620MPa, the elongation is controlled to be 20-24%, and the-40 DEG C V type ballistic work is controlled to be 170-210J.
Description
Technical field
The present invention relates to the bridge steel plate production field, relate in particular to a kind of 100mm Q460qE bridge steel plate and production method thereof.
Background technology
Be mainly used in the significant points such as bridge structure, connection due to bridge steel plate, thereby higher to the intensity of steel plate, toughness reguirements etc., therefore be added with the alloys such as a large amount of Nb, V, Ti, Ni in Composition Design, and be subjected to the effects limit such as high strength, high tenacity, this steel plate requires very strict to steel rolling, thermal treatment process.Traditional Q460qE produces, and due to the defective of the unreasonable and production technique of chemical composition design, easily causes the serious problems such as generative center segregation, loose and inclusion.
the application number of authorizing on August 22nd, 2012 is that 201010159178.2 patent of invention discloses a kind of 100mm Q 390 E class super-thick steel plate with thickness and manufacture method thereof, in steel plate, the chemical component weight percentage ratio of steel is: C:0.08-0.13%, Mn:1.20-1.60%, Si:0.10-0.25%, P :≤0.015%, S :≤0.005%, Ni:0.10-0.40%, Nb:0.010-0.030%, V:0.020-0.050%, Al:0.020-0.040%, surplus is Fe and inevitable impurity, C in described steel, Nb, the chemical component weight per-cent of V meets the proportion relation of 0.26%≤C+6Nb+4V≤0.40%.Rolling technology is: 1200-1250 ℃ of thickness 260mm continuous blank heating temperature, soaking time 4.0-4.5 hour, tapping temperature 1180-1220 ℃; The employing two-stage control is rolling, every time draft of roughing 10-20%, finishing temperature 1000-1050 ℃, roughing becomes the intermediate blank of 1.5-2.0 times of finished product thickness, 850-900 ℃ of finish rolling start rolling temperature, every time draft 8-12%, roll rear employing laminar flow cooling, final cooling temperature 500-650 ℃, rate of cooling 5-10 ℃/s, high temperature rolls off the production line temperature 450-550 ℃, 60-72 hour cooling in heap time.Its weak point is: because it does not adopt thermal treatment process, directly cause its case depth inadequate, cause its yield strength, low cross-intensity, its impact resistance is low, has greatly limited the range of application of steel plate.
Summary of the invention
The objective of the invention is to overcome the prior art deficiency, a kind of chemistry part is reasonable in design, intensity is high, toughness is large, impact resistance is large middle thickness bridge steel plate and production method thereof are provided.
For realizing that the technical scheme that purpose of the present invention adopts is: a kind of 100mm Q460qE bridge steel plate, it comprises the chemical composition of following mass percent:
C:0.13-0.17 %, Si:0.25-0.45 %, Mn:1.50-1.60 %, P :≤0.015 %, S :≤0.005 %, Ni:0.40-0.50 %, V:0.06-0.07 %, Nb:0.04-0.05 %, Ti:0.01-0.02 %, Als:0.015-0.035 %, other is Fe and relict element.
Described 100mm Q460qE bridge steel plate has the bainite that volume fraction is 75-85 %, and volume fraction is that martensite and the volume fraction of 15-25 % is the ferrite of 1-6 %.
As preferred version of the present invention, the chemical composition mass percent of described 100mm Q460qE bridge steel plate is:
C:0.15%, Si:0.35%, Mn:1.58%, P:0.011%, S:0.003%, Ni:0.42%, V:0.065%, Nb:0.046%, Ti:0.016%, Als:0.025%, other is Fe and relict element, and its metallographic structure has the bainite of 79% volume, the austenite of 18 % volumes and the ferrite of 3% volume.
A kind of production method of above-mentioned 100mm Q460qE bridge steel plate, its technical process comprises: KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, die casting cast, strand cooling in heap, strand heating, rolling, control is cold, roller thermal straightening machine, cooling in heap, finishing, thermal treatment, outer inspection, flaw detection, warehouse-in
Described KR hot metal pretreatment technology, the molten iron that arrives at a station are taken off front slag and are taken off rear slag, guarantee liquid level thickness of slag layer≤20mm, and molten iron guarantees that after the KR stirring desulphurization molten iron contains S≤0.005% by mass percentage, assurance desulfurization cycle≤21min, sweetening process temperature drop≤20 ℃;
described converter smelting process, enter the stove molten iron and contain by mass percentage S≤0.005%, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, process rifle position is by 1.0-1.3m in early stage, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, the tapping target contains P≤0.015% by mass percentage, C 〉=0.05%, S≤0.012%, in tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before tapping, before finishing, tapping adopts the slag stop cone pushing off the slag, guarantee thickness of slag layer≤30mm, require omnidistance Argon in converter tapping process,
Described argon blowing process, the disposable aluminum steel that adds in argon station requires strong Argon 3min at the argon station, and flow 200-500NL/min, molten steel face bore hole diameter control be at 300-500mm, must not be lower than 1570 ℃ from argon station temperature;
described LF refinery practice, omnidistance Argon in refining process, Argon intensity is regulated according to different link needs, add refining slag, basicity is pressed 4.0-6.0 and is controlled, the refinement and deoxidation agent is with calcium carbide, aluminum shot, ferrosilicon powder is main, heat-up time is by twice control, heat for the first time 7-12min, heat for the second time 6-10min, add reductor in heat-processed for the second time, and require the dry slag number of times to be not less than 6 times, add silicon-calcium wire before leaving from station, close argon gas before adding silicon-calcium wire, when not adopting vacuum outgas, upper steel temperature is 1565 ± 15 ℃, when adopting vacuum outgas, upper steel temperature is 1610 ± 15 ℃,
Described VD refinery practice, VD vacuum tightness reaches below 67Pa, dwell time 〉=15min, soft blow 2-5min or do not blow after vacuum breaker, in the soft blow process, molten steel must not be exposed, and wrapping online the pumpdown time is the 1/1.7min that vacuumizes front liquid steel temperature and temperature gap leaving from station, and insulating covering agent guarantees to be paved with the molten steel face, close argon gas before adding insulating covering agent, 1565 ± 15 ℃ of upper steel temperature;
Described die casting pouring technology adopts continuous casting process, and the 300-350mm section is produced, whole process is taked the protection cast, prevents that molten steel is air-breathing, and middle bag superheating temperature is controlled in 15-25 ℃ of scope, pulling speed of continuous casting is carried out according to 0.72m/min, the two cooling water meters of cold employing 8#, the cooling employing of crystallizer 2# cooling curve;
Described strand heating process is delivered to continuous oven after the strand cooling in heap and is heated, one-phase Heating temperature≤950 ℃, and the two-stage heating and temperature control is at 1220-1240 ℃, and the soaking zone temperature is controlled at 1200-1220 ℃, is controlled at the 5-6h left and right total heat-up time;
Described rolling technology adopts two stage rolling, and 1020 ℃-1120 ℃ of one-phase start rolling temperatures adopt high temperature low speed to depress greatly rolling, and draught per pass is 35mm; Two-stage start rolling temperature 800-830 ℃, the two-stage takes to depress greatly rolling, last pass draft 〉=15%, finishing temperature 770-800 ℃;
Described cooling control technology adopts the ACC laminar flow cooling, and entering water temp is 760 ℃-780 ℃, and red temperature is controlled at 600-630 ℃;
Described cooling in heap technique, stacking slow cooling temperature are not less than 450 ℃, cooling in heap time 〉=72 hour;
Described thermal treatment process adopts normalizing+fast cold thermal treatment process, 920 ± 10 ℃ of normalizing temperatures, and t=2.2min/mm, water-cooled red temperature are controlled at 560-580 ℃.
As further prioritization scheme of the present invention, described rolling technology adopts two stage rolling, 1060 ℃-1100 ℃ of one-phase start rolling temperatures, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, high temperature low speed is depressed greatly rolling, and draught per pass is 35mm; 820 ℃ of two-stage start rolling temperatures, the two-stage takes to depress greatly the intermediate blank that is rolled into 1.5-2 times of finished product thickness, last pass draft 〉=15%, 780 ℃ of finishing temperatures.
The present invention is by rational chemical composition design, and LF+VD technique guarantees the cleanliness factor of steel, and effectively implements by techniques such as heating, rolling and modifier treatment, has successfully realized 100mm Q460qE bridge steel plate.Described cooling in heap technique, employing high temperature cooling in heap technique can effectively be avoided the unrelieved stress because of quick cooling generation, can greatly reduce the content of hydrogen in steel plate simultaneously, fully realizes thermal diffusion effect, improves the steel plate inspection defective; By adopting austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, make product of the present invention have the metallographic structure of remarkable characteristic, and in conjunction with effective enforcement of thermal treatment process, greatly the tried to stop people from fighting each other case depth of product, its yield strength reaches 470-500MPa, tensile strength reaches 580-620 MPa; Elongation reaches 20%-24%;-40 ℃ of V-type ballistic works are up to 170-210 J.
Embodiment
Embodiment one
A kind of 100mm Q460qE bridge steel plate, it comprises the chemical composition of following mass percent, and (unit: wt): C:0.15%, Si:0.35%, Mn:1.58%, P:0.011%, S:0.003%, Ni:0.42%, V:0.065%, Nb:0.046%, Ti:0.016%, Als:0.025%, other is Fe and relict element.
It is 75% bainite that described 100mm Q460qE bridge steel plate has volume fraction, and volume fraction is that 20% martensite and volume fraction are 5% ferrite.
A kind of production method of above-mentioned 100mm Q460qE bridge steel plate, its technical process comprises: KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, die casting cast, strand cooling in heap, strand heating, rolling, control is cold, roller thermal straightening machine, cooling in heap, finishing, thermal treatment, outer inspection, flaw detection, warehouse-in.
Described KR hot metal pretreatment technology, the molten iron that arrives at a station are taken off front slag and are taken off rear slag, guarantee liquid level thickness of slag layer≤20mm, and molten iron guarantees that after the KR stirring desulphurization molten iron contains S≤0.005% by mass percentage, assurance desulfurization cycle≤21min, sweetening process temperature drop≤20 ℃;
described converter smelting process, enter the stove molten iron and contain by mass percentage S≤0.005%, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, process rifle position is by 1.0-1.3m in early stage, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, the tapping target contains P≤0.015% by mass percentage, C 〉=0.05%, S≤0.012%, in tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before tapping, before finishing, tapping adopts the slag stop cone pushing off the slag, guarantee thickness of slag layer≤30mm, require omnidistance Argon in converter tapping process,
Described argon blowing process, the disposable aluminum steel that adds in argon station requires strong Argon 3min at the argon station, and flow 200-500NL/min, molten steel face bore hole diameter control be at 300-500mm, must not be lower than 1570 ℃ from argon station temperature;
Described LF refinery practice, omnidistance Argon in refining process, Argon intensity is regulated according to different link needs.Add refining slag, basicity is pressed 4.0-6.0 and is controlled, the refinement and deoxidation agent is take calcium carbide, aluminum shot, ferrosilicon powder as main, heat-up time is by twice control, heat for the first time 7-12min, heat 6-10min for the second time, require according to the slag making situation in two heat-processedes, add reductor, and require the dry slag number of times greater than 6 times.Add silicon-calcium wire before leaving from station, close argon gas before adding silicon-calcium wire, when not adopting vacuum outgas, upper steel temperature is 1565 ± 15 ℃, and when adopting vacuum outgas, upper steel temperature is 1610 ± 15 ℃;
Described VD refinery practice, VD vacuum tightness reaches below 67Pa, dwell time 〉=15min, soft blow 2-5min or do not blow after vacuum breaker, in the soft blow process, molten steel must not be exposed, and wrapping online the pumpdown time is the 1/1.7min that vacuumizes front liquid steel temperature and temperature gap leaving from station, and insulating covering agent guarantees to be paved with the molten steel face, close argon gas before adding insulating covering agent, 1565 ± 15 ℃ of upper steel temperature;
Described die casting pouring technology adopts continuous casting process, and the 300-350mm section is produced, whole process is taked the protection cast, prevents that molten steel is air-breathing, and middle bag superheating temperature is controlled in 15-25 ℃ of scope, pulling speed of continuous casting is carried out according to 0.72m/min, the two cooling water meters of cold employing 8#, the cooling employing of crystallizer 2# cooling curve;
Described strand heating process is delivered to continuous oven after the strand cooling in heap and is heated, one-phase Heating temperature≤950 ℃, and the two-stage heating and temperature control is at 1220-1240 ℃, and the soaking zone temperature is controlled at 1200-1220 ℃, is controlled at the 5-6h left and right total heat-up time;
Described rolling technology adopts two stage rolling, and 1020 ℃-1120 ℃ of one-phase start rolling temperatures adopt high temperature low speed to depress greatly rolling, and draught per pass is 35mm; Two-stage start rolling temperature 800-830 ℃, the two-stage takes to depress greatly rolling, last pass draft 〉=15%, finishing temperature 770-800 ℃;
Described cooling control technology adopts the ACC laminar flow cooling, and entering water temp is 760 ℃-780 ℃, and red temperature is controlled at 600-630 ℃;
Described cooling in heap technique, stacking slow cooling temperature are not less than 450 ℃, cooling in heap time 〉=72 hour;
Described thermal treatment process adopts normalizing+fast cold thermal treatment process, 920 ± 10 ℃ of normalizing temperatures, and t=2.2min/mm, water-cooled red temperature are controlled at 560-580 ℃.
Embodiment two
A kind of 100mm Q460qE bridge steel plate, it comprises chemical composition (unit: wt): C:0.15%, Si:0.35%, Mn:1.58%, P:0.011%, S:0.003%, Ni:0.42%, V:0.065%, Nb:0.046%, Ti:0.016%, the Als:0.025% of following mass percent, other is Fe and relict element, and its metallographic structure has the bainite of 79% volume, the austenite of 18 % volumes and the ferrite of 3% volume.
The difference of its technical process and embodiment one is: rolling technology adopts two stage rolling, 1060 ℃-1100 ℃ of one-phase start rolling temperatures, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, high temperature low speed is depressed greatly rolling, and draught per pass is 35mm; 820 ℃ of two-stage start rolling temperatures, the two-stage takes to depress greatly the intermediate blank that is rolled into 1.5-2 times of finished product thickness, last pass draft 〉=15%, 780 ℃ of finishing temperatures.
Embodiment three
The present invention adopts converter smelting, die casting cast, and the rolling method of 3800m wide and heavy plate mill is produced 100mm Q460qE bridge steel plate.Its technical process is: high-quality molten iron, KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, die casting cast, strand cooling in heap 18 hours, strand heating, 3800m mill milling, control are cold, roller thermal straightening machine, cooling in heap, finishing, thermal treatment, outer inspection, flaw detection, warehouse-in.
100mm Q460qE bridge steel plate in technical scheme comprises the chemical composition of following mass percent: Composition Design: C:0.16%, Si:0.40%, Mn:1.58%, P:0.012%, S:0.004%, Ni:0.46%, V:0.066%, Nb:0.047%, Ti:0.018%, Als:0.033%, other is Fe and relict element, it is 77% bainite that described 100mm Q460qE bridge steel plate has volume fraction, and volume fraction is that 19% martensite and volume fraction are 4% ferrite.
The KR hot metal pretreatment technology: the molten iron that arrives at a station is taken off front slag and is taken off rear slag, guarantees liquid level thickness of slag layer≤15mm, and molten iron guarantees that after the KR stirring desulphurization molten iron contains S≤0.003% by mass percentage, assurance desulfurization cycle≤18min, sweetening process temperature drop≤18 ℃.
Converter smelting process: enter the stove molten iron and contain by mass percentage S≤0.003%, P≤0.080%, molten iron temperature 〉=1370 ℃, molten iron Intake Quantity error is controlled by ± 1t, process rifle position by early stage 1.25m, mid-term 1.5m, later stage 1.05m control, slag making basicity is controlled by 3.5, the tapping target contains P≤0.010%, C 〉=0.08%, S≤0.01% by mass percentage, in tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite.With slag tapping before the floating plug gear, adopt the slag stop cone pushing off the slag before tapping finishes before tapping, guarantee thickness of slag layer≤20mm, require omnidistance Argon in converter tapping process.
Argon blowing process: the disposable aluminum steel that adds in argon station, require strong Argon 3min at the argon station, flow 400NL/min, molten steel face bore hole diameter control be at 400mm, must not be lower than 1670 ℃ from argon station temperature.
LF refinery practice: omnidistance Argon in refining process, Argon intensity is regulated according to different link needs, adds refining slag, and basicity is controlled by 5.0, the refinement and deoxidation agent is take calcium carbide, aluminum shot, ferrosilicon powder as main, and add-on is according to oxygen level in molten steel and make the white slag situation and add in right amount.Heat-processed is more than needed according to rhythm selects suitable electric current to heat with temperature conditions, for the first time heat 10min, for the second time heat 8min by twice control heat-up time, requires according to the slag making situation in heat-processed for the second time, add reductor, and require the dry slag number of times greater than 6 times.Add silicon-calcium wire before leaving from station, close argon gas, 1580 ℃ of upper steel temperature (not adopting vacuum outgas) before adding silicon-calcium wire.
VD refinery practice: VD vacuum tightness 67Pa, dwell time 18min, soft blow 4min after vacuum breaker, in the soft blow process, molten steel must not be exposed, the online bag pumpdown time is the 1/1.7min that vacuumizes front liquid steel temperature and temperature gap leaving from station, insulating covering agent guarantees to be paved with the molten steel face, closes argon gas, 1580 ℃ of upper steel temperature before adding insulating covering agent.
Continuous casting process: adopt the production of 340mm section, whole process is taked the protection cast, prevents that molten steel is air-breathing, and middle bag superheating temperature is controlled in 20-25 ℃ of scope, and pulling speed of continuous casting is carried out according to 0.72m/min, the two cooling water meters of cold employing 8#, the cooling employing of crystallizer 2# cooling curve;
Heating process: deliver to continuous oven after the strand cooling in heap and heat, 940 ℃ of one-phase Heating temperatures, two-stage heating and temperature control are at 1240 ℃, and the soaking zone temperature is controlled at 1220 ℃, are controlled at 6h total heat-up time;
Controlled rolling and controlled cooling
Adopt two stage rolling, 1120 ℃ of one-phase start rolling temperatures adopt high temperature low speed to depress greatly rolling, and reduction in pass is 35mm; 830 ℃ of two-stage start rolling temperatures, the two-stage takes to depress greatly rolling, last pass draft 20%, 800 ℃ of finishing temperatures; It is 780 ℃ that cooling control technology requires into water temp, and red temperature is controlled at 630 ℃.
Cooling in heap technique: employing high temperature cooling in heap technique can effectively be avoided the unrelieved stress because of quick cooling generation, can greatly reduce the content of hydrogen in steel plate simultaneously, fully realizes thermal diffusion effect, improves the steel plate inspection defective.The steel plate stacking retarded cooling process is as follows; 480 ℃ of stacking slow cooling temperature, 80 hours cooling in heap time;
Thermal treatment process: adopt normalizing+fast cold thermal treatment process, 930 ℃ of normalizing temperatures, t=2.2min/mm, water-cooled red temperature are controlled at 580 ℃;
Embodiment four
The present embodiment adopts converter smelting, die casting cast, the rolling method of 3800m wide and heavy plate mill is produced 100mm Q460qE bridge steel plate, and its technical process is: high-quality molten iron, KR hot metal pretreatment, converter smelting, Argon processings, LF refining, VD refining, die casting cast, strand cooling in heap 60 hours, strand heating, 3800m mill milling, control cold, roller thermal straightening machine, cooling in heap, finishing, thermal treatment, outer inspection, flaw detection, warehouse-in.
100mm Q460qE bridge steel plate comprises the chemical composition (unit of following mass percent in the embodiment scheme, wt): Composition Design: C:0.17%, Si:0.45%, Mn:1.60%, P:0.015%, S:0.005%, Ni:0.50%, V:0.07%, Nb:0.05%, Ti:0.020%, Als:0.035%, other is Fe and relict element.It is 83% bainite that described 100mm Q460qE bridge steel plate has volume fraction, and volume fraction is that 16% martensite and volume fraction are 1% ferrite.
The KR hot metal pretreatment technology: the molten iron that arrives at a station is taken off front slag and is taken off rear slag, guarantees liquid level thickness of slag layer 20mm, and molten iron guarantees that after the KR stirring desulphurization molten iron contains S≤0.005% by mass percentage, assurance desulfurization cycle≤21min, sweetening process temperature drop≤20 ℃.
Converter smelting process: enter the stove molten iron and contain by mass percentage S≤0.005%, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, process rifle position by early stage 1.3m, mid-term 1.6m, later stage 1.1m control, slag making basicity R controls by 4.0, the tapping target contains P≤0.015%, C 〉=0.05%, S≤0.012% by mass percentage, in tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite.With slag tapping before the floating plug gear, adopt the slag stop cone pushing off the slag before tapping finishes before tapping, guarantee thickness of slag layer≤30mm, require omnidistance Argon in converter tapping process.
Argon blowing process: the disposable aluminum steel that adds in argon station, require strong Argon 3min at the argon station, flow 500NL/min, molten steel face bore hole diameter control be at 500mm, must not be lower than 1570 ℃ from argon station temperature.
The LF refinery practice: omnidistance Argon in refining process, Argon intensity is regulated according to different link needs.Add refining slag, basicity is controlled by 6.0, and the refinement and deoxidation agent is take calcium carbide, aluminum shot, ferrosilicon powder as main, and add-on is according to oxygen level in molten steel and make the white slag situation and add in right amount.Heat-processed is more than needed according to rhythm selects suitable electric current to heat with temperature conditions, for the first time heat 12min, for the second time heat 10min by twice control heat-up time, requires according to the slag making situation in heat-processed for the second time, add reductor, and require the dry slag number of times greater than 6 times.Add silicon-calcium wire before leaving from station, close argon gas, 1625 ℃ of upper steel temperature (employing vacuum outgas) before adding silicon-calcium wire.
The VD refinery practice: VD vacuum tightness reaches below 67Pa, dwell time 15min, and soft blow 5min or do not blow after vacuum breaker, in the soft blow process, molten steel must not be exposed.The online bag pumpdown time is the 1/1.7min that vacuumizes front liquid steel temperature and temperature gap leaving from station, and the insulating covering agent assurance is paved with the molten steel face, closes argon gas, 1580 ℃ of upper steel temperature before adding insulating covering agent.
Continuous casting process: adopt the production of 350mm section, whole process is taked the protection cast, prevents that molten steel is air-breathing, and middle bag superheating temperature is controlled at 25 ℃, and pulling speed of continuous casting is carried out according to 0.72m/min, the two cooling water meters of cold employing 8#, the cooling employing of crystallizer 2# cooling curve;
Heating process: deliver to continuous oven after the strand cooling in heap and heat, 950 ℃ of one-phase Heating temperatures, two-stage heating and temperature control are at 1240 ℃, and the soaking zone temperature is controlled at 1220 ℃, are controlled at the 6h left and right total heat-up time;
Controlled rolling and controlled cooling
Adopt two stage rolling, 1120 ℃ of one-phase start rolling temperatures adopt high temperature low speed to depress greatly rolling, and reduction in pass is 35mm; 830 ℃ of two-stage start rolling temperatures, the two-stage takes to depress greatly rolling, last pass draft 15%, 800 ℃ of finishing temperatures; It is 780 ℃ that cooling control technology requires into water temp, and red temperature is controlled at 630 ℃.
Cooling in heap technique: employing high temperature cooling in heap technique can effectively be avoided the unrelieved stress because of quick cooling generation, can greatly reduce the content of hydrogen in steel plate simultaneously, fully realizes thermal diffusion effect, improves the steel plate inspection defective.The steel plate stacking retarded cooling process is as follows; 450 ℃ of stacking slow cooling temperature, 72 hours cooling in heap time;
Thermal treatment process: adopt normalizing+fast cold thermal treatment process, 930 ℃ of normalizing temperatures, t=2.2min/mm, water-cooled red temperature are controlled at 580 ℃;
Embodiment five mechanical mechanics property interpretations of result
Composition and mechanical mechanics property are pressed GB712-2000 and are carried out, and mechanical property is specifically as above shown in table.
This produces respectively totally 4 batches of 100mm Q460qE bridge steel plates as a trial, guarantee the cleanliness factor of steel by rational chemical composition design LF+VD technique, and effectively implement by techniques such as heating, rolling and modifier treatment, successfully realized 100mm Q460qE bridge steel plate.Employing high temperature cooling in heap technique can effectively be avoided the unrelieved stress because of quick cooling generation, can greatly reduce the content of hydrogen in steel plate simultaneously, fully realizes thermal diffusion effect, improves the steel plate inspection defective.By adopting austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, make product of the present invention have the metallographic structure of remarkable characteristic, and in conjunction with effective enforcement of thermal treatment process, make yield strength and the tensile strength of the application's product improve 1.5-2 doubly, its yield strength can reach 470-500 MPa, and tensile strength has reached 580-620 MPa effectively; Elongation is controlled at 20%-24%;-40 ℃ of V-type ballistic works are increased to original 2-2.5 doubly, have brought up to 170-210 J.100mm Q460qE bridge steel plate performance index of the present invention have satisfied standard and customer requirement fully, have wide popularizing application prospect.
Claims (5)
1. 100mm Q460qE bridge steel plate, it is characterized in that: it comprises the chemical composition of following mass percent:
C:0.13-0.17 %, Si:0.25-0.45 %, Mn:1.50-1.60 %, P :≤0.015 %, S :≤0.005 %, Ni:0.40-0.50 %, V:0.06-0.07 %, Nb:0.04-0.05 %, Ti:0.01-0.02 %, Als:0.015-0.035 %, other is Fe and relict element.
2. 100mm Q460qE bridge steel plate as claimed in claim 1, it is characterized in that: described 100mm Q460qE bridge steel plate has the bainite that volume fraction is 75-85 %, and volume fraction is that martensite and the volume fraction of 15-25 % is the ferrite of 1-6 %.
3. 100mm Q460qE bridge steel plate as claimed in claim 1, it is characterized in that: as preferred version of the present invention, the chemical composition mass percent of described 100mm Q460qE bridge steel plate is:
C:0.15%, Si:0.35%, Mn:1.58%, P:0.011%, S:0.003%, Ni:0.42%, V:0.065%, Nb:0.046%, Ti:0.016%, Als:0.025%, other is Fe and relict element, and its metallographic structure has the bainite of 79% volume, the austenite of 18 % volumes and the ferrite of 3% volume.
4. a production is as the production method of the described 100mm Q460qE of any one in claim 1-3 bridge steel plate, and it is characterized in that: its technical process comprises: its technical process comprises: KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, die casting cast, strand cooling in heap, strand heating, rolling, control is cold, roller thermal straightening machine, cooling in heap, finishing, thermal treatment, outer inspection, flaw detection, warehouse-in;
Described KR hot metal pretreatment technology, the molten iron that arrives at a station must be taken off front slag and take off rear slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees that after the KR stirring desulphurization molten iron contains S≤0.005% by mass percentage, assurance desulfurization cycle≤21min, sweetening process temperature drop≤20 ℃;
described converter smelting process, enter the stove molten iron and contain by mass percentage S≤0.005%, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, process rifle position is by 1.0-1.3m in early stage, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, the tapping target contains P≤0.015% by mass percentage, C 〉=0.05%, S≤0.012%, in tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before tapping, before finishing, tapping adopts the slag stop cone pushing off the slag, guarantee thickness of slag layer≤30mm, require omnidistance Argon in converter tapping process,
Described argon blowing process, the disposable aluminum steel that adds in argon station requires strong Argon 3min at the argon station, and flow 200-500NL/min, molten steel face bore hole diameter control be at 300-500mm, must not be lower than 1570 ℃ from argon station temperature;
described LF refinery practice, omnidistance Argon in refining process, Argon intensity is regulated according to different link needs, add refining slag, basicity is pressed 4.0-6.0 and is controlled, the refinement and deoxidation agent is with calcium carbide, aluminum shot, ferrosilicon powder is main, heat-up time is by twice control, heat for the first time 7-12min, heat for the second time 6-10min, add reductor in heat-processed for the second time, and require the dry slag number of times to be not less than 6 times, add silicon-calcium wire before leaving from station, close argon gas before adding silicon-calcium wire, when not adopting vacuum outgas, upper steel temperature is 1565 ± 15 ℃, when adopting vacuum outgas, upper steel temperature is 1610 ± 15 ℃,
Described VD refinery practice, VD vacuum tightness must reach below 67Pa, dwell time is necessary 〉=15min, soft blow 2-5min or do not blow after vacuum breaker, in the soft blow process, molten steel must not be exposed, and wrapping online the pumpdown time is the 1/1.7min that vacuumizes front liquid steel temperature and temperature gap leaving from station, and insulating covering agent guarantees to be paved with the molten steel face, must close argon gas before adding insulating covering agent, 1565 ± 15 ℃ of upper steel temperature;
Described die casting pouring technology adopts continuous casting process, and the 300-350mm section is produced, whole process is taked the protection cast, prevents that molten steel is air-breathing, and middle bag superheating temperature is controlled in 15-25 ℃ of scope, pulling speed of continuous casting is carried out according to 0.72m/min, the two cooling water meters of cold employing 8#, the cooling employing of crystallizer 2# cooling curve;
Described strand heating process is delivered to continuous oven after the strand cooling in heap and is heated, one-phase Heating temperature≤950 ℃, and the two-stage heating and temperature control is at 1220-1240 ℃, and the soaking zone temperature is controlled at 1200-1220 ℃, is controlled at the 5-6h left and right total heat-up time;
Described rolling technology adopts two stage rolling, and 1020 ℃-1120 ℃ of one-phase start rolling temperatures adopt high temperature low speed to depress greatly rolling, and draught per pass is 35mm; Two-stage start rolling temperature 800-830 ℃, the two-stage takes to depress greatly rolling, last pass draft 〉=15%, finishing temperature 770-800 ℃;
Described cooling control technology adopts the ACC laminar flow cooling, and entering water temp is 760 ℃-780 ℃, and red temperature is controlled at 600-630 ℃;
Described cooling in heap technique, stacking slow cooling temperature are not less than 450 ℃, cooling in heap time 〉=72 hour;
Described thermal treatment process adopts normalizing+fast cold thermal treatment process, 920 ± 10 ℃ of normalizing temperatures, and t=2.2min/mm, water-cooled red temperature are controlled at 560-580 ℃.
5. the production method of 100mm Q460qE bridge steel plate as claimed in claim 4, it is characterized in that: as further prioritization scheme, described rolling technology, adopt two stage rolling, 1060 ℃～1100 ℃ of one-phase start rolling temperatures, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, high temperature low speed is depressed greatly rolling, and draught per pass is 35mm; 820 ℃ of two-stage start rolling temperatures, the two-stage takes to depress greatly the intermediate blank that is rolled into 1.5-2 times of finished product thickness, last pass draft 〉=15%, 780 ℃ of finishing temperatures.
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