CN102345057B - High strength and toughness Q460E structural steel thick plate and production method thereof - Google Patents
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Abstract
The invention discloses a high strength and toughness Q460E structural steel thick plate. The thick plate comprises the following chemical components by weight percent: 0.10-0.17% of C, 0.20-0.45% of Si, 1.30-1.65% of Mn, 0.018% or less of P, 0.007% or less of S, 0.015-0.050% of Als, 0.025-0.060% of Nb, 0.055-0.070% of V, 0.015-0.025% of Ti and the balance Fe and residual elements. The carbon equivalent [Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] is no more than 0.48. The production method comprises the following technologies: KR molten iron pretreatment, converter smelting, argon-blowing treatment, ladle furnace (LF) refining, vapor deposition (VD) refining, die casting, heating, controlled rolling and controlled cooling and stack cooling. On the basis of ensuring the original components of the high strength and toughness Q460E structural steel, the contents and ratio of the alloy elements in the Q460E steel, namely C, Mn and Nb are adjusted properly; the content of harmful elements in the steel such as P and S which can influence the plasticity and toughness of the steel plate can be strictly controlled; the heating cycle of steel rolling is strictly controlled; and the rolling process adopts the ways of reducing the finish rolling temperature, increasing the cooling rate after rolling and perform stacking and slow cooling to the steel plate after rolling, thus each performance index of the steel plate meet the standard requirement.
Description
Technical field
The invention belongs to the steel plate production technical field, be specifically related to a kind of high-strong toughness structure iron Q460E slab and production method thereof.
Background technology
In known technology, traditional Q460E slab need of production is heat-treated, so that production energy consumption increases, production cost increases like this, and is very unfavorable to enterprise development and competition.
Summary of the invention
For the problems referred to above, the invention provides a kind of cost, easy high-strong toughness structure iron Q460E slab and production method thereof of production of saving.
A kind of high-strong toughness structure iron Q460E slab, chemical ingredients (the unit that comprises following mass percent, wt%): C:0.10～0.17, Si:0.20～0.45, Mn:1.30～1.65, P≤0.018, S≤0.007, Als:0.015～0.050, Nb:0.025～0.060, V:0.055～0.070, Ti:0.015～0.025, other is Fe and relict element.
The carbon equivalent of described high-strong toughness structure iron Q460E slab≤0.48.
For achieving the above object, the production method of described high-strong toughness structure iron Q460E slab, it comprises the steps:
The a.KR hot metal pretreatment: the molten iron that arrives at a station must be taken off front slag and take off rear slag, guarantees liquid level thickness of slag layer≤20mm, and molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
B. converter smelting: adopt 100/120 ton of top and bottom combined blown converter, enter and contain by mass percentage S≤0.005% in the stove molten iron, contain 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 control, slag making basicity R presses 2.5-4.0 control, tapping target P≤0.015%, C 〉=0.05%, S≤0.012%, in ladle, add Si-Al-Ba-Ca in the tapping process, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before the tapping, before finishing, tapping adopts the slag stop cone pushing off the slag, guarantee thickness of slag layer≤30mm, require omnidistance Argon in the converter tapping process;
C. Argon is processed: the disposable adding aluminum steel in argon station, require strong Argon 3min at the argon station, and flow 200-500NL/min, molten steel face bore hole diameter control must not be lower than 1570 ℃ at 300～500mm from argon station temperature;
The d.LF refining: omnidistance Argon in the refining process, add slag charge, basicity is pressed 4.0-6.0 control, add reductor, add the thermal recovery electric current and heat, heat-up time, one heating 7-12min, two heated 6-10min by twice control, add reductor in two heat-processedes, and requiring the dry slag number of times greater than 6 times, front adding silicon-calcium wire leaving from station must be closed argon gas before adding silicon-calcium wire, do not adopt 1565 ± 15 ℃ of the upper steel temperature of vacuum outgas, adopt 1610 ± 15 ℃ of the upper steel temperature of vacuum outgas;
The e.VD refining: VD vacuum tightness must reach below the 67Pa, dwell time is necessary 〉=15min, soft blow 2-5min or do not blow behind the vacuum breaker, molten steel must not expose in the soft blow process, online bag pumpdown time 1.7min, insulating covering agent guarantees to be paved with the molten steel face, must close argon gas, 1565 ± 15 ℃ of upper steel temperature before adding insulating covering agent;
F. continuous casting: 15 ± 10 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, specific water: 0.80L/ ㎏, electricity stirs: 900A, 5Hz, 30s-3-30s, continuous-casting steel pouring requires the whole process protection casting, unwraps greatly to water in the rear 1min and must overlap protective tube, requires cooling in heap 〉=12h after strand rolls off the production line;
G. heating: Heating temperature and heat-up time are as follows: 900-1000 ℃ of preheating section temperature, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-13min/cm;
H. controlled rolling and controlled cooling: 1100 ℃～1150 ℃ of start rolling temperatures, the one-phase finishing temperature is at 980 ℃～1000 ℃, treat that temperature thickness is 2.2～2.5 times of finished product thickness, two-stage start rolling temperature≤900 ℃, two-stage bonding percentage pass reduction 〉=15%, accumulative total draft 〉=60%, 760～860 ℃ of finishing temperatures; Guarantee that speed of cooling is controlled at 3-15 ℃/S, then red temperature is sent to the straightener aligning between 610～690 ℃;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time 〉=24 hour.
Because the present invention is by the KR hot metal pretreatment, converter smelting, Argon is processed, the LF refining, the VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technique, on the composition basis of original Q460E high-strong toughness structure iron, suitably adjust C among the Q460E, Mn, the content of Nb alloying element and ratio, and strictly control P in the steel, S etc. affect the harmful element content of steel plate plasticity and toughness, strictly control simultaneously the heating cycle of steel rolling, the operation of rolling adopts and reduces finishing temperature, roll rear raising speed of cooling and the mode of rolling rear steel plate stacking slow cooling, thereby the property indices that guarantees steel plate reaches standard-required.In smelting process, strictly control P(phosphorus in the steel), S(sulphur) etc. harmful element, guarantee that the purity of molten steel reaches the Clean Steel level substantially.In follow-up rolling heat-processed, for preventing the inside steel billet coarse grains, suitably reduce Heating temperature, avoid the inside steel billet original austenite grains too to grow up, be the refinement establish a firm foundation of steel billet crystal grain in the operation of rolling.In the operation of rolling, TMCP rolling technique and steel plate stacking slow cooling technology by adopting domestic advanced person can guarantee Q460E plate property demand.In the constant situation of traditional Q460E carbon equivalent, the rolling and steel plate stacking slow cooling mode by TMCP has been guaranteed the plate property requirement that is up to state standards; Simplify simultaneously production technique, cancelled the thermal treatment flow process, reduce production energy consumption, greatly reduce production cost.
Embodiment
Saving cost of the present invention, the easy high-strong toughness structure iron Q460E slab of production comprise the chemical ingredients (unit of following mass percent, wt%): C:0.10～0.17, Si:0.20～0.45, Mn:1.30～1.65, P≤0.018, S≤0.007, Als:0.015～0.050, Nb:0.025～0.060, V:0.055～0.070, Ti:0.015～0.025, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.48.
For achieving the above object, the production method that the present invention takes comprises: KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap.In described KR hot metal pretreatment, the molten iron that arrives at a station must be taken off front slag and take off rear slag, guarantees liquid level thickness of slag layer≤20mm, and molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃; In described converter smelting, adopt 100/120 ton of top and bottom combined blown converter, enter and contain by mass percentage S≤0.005% in the stove molten iron, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, steel scrap strictly adopts the high-quality scrap stock, process rifle position is by 1.0-1.3m in early stage, mid-term 1.2-1.6m, later stage 1.0-1.1m control, slag making basicity R presses 2.5-4.0 control, tapping target P≤0.015%, C 〉=0.05%, S≤0.012%, in the tapping process in the ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before the tapping, adopt the slag stop cone pushing off the slag before tapping finishes, guarantee thickness of slag layer≤30mm, require omnidistance Argon in the converter tapping process; In described Argon was processed, the disposable adding aluminum steel in argon station required strong Argon 3min at the argon station, flow 200-500NL/min, and molten steel face bore hole diameter control must not be lower than 1570 ℃ at 300～500mm from argon station temperature; In described LF refining, omnidistance Argon in the refining process, Argon intensity is regulated according to different link needs, add refining slag, basicity is pressed 4.0-6.0 control, the refinement and deoxidation agent is with calcium carbide, aluminum shot, ferrosilicon powder is main, add-on is according to oxygen level in the molten steel and make the white slag situation and add in right amount, heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions, heat-up time is by twice control, one heating 7-12min, two heating 6-10min 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, front adding silicon-calcium wire leaving from station must be closed argon gas, 1565 ± 15 ℃ of upper steel temperature (not adopting vacuum outgas)/1610 ± 15 ℃ (employing vacuum outgas) before adding silicon-calcium wire; In described VD refining, VD vacuum tightness must reach below the 67Pa, dwell time is necessary 〉=15min, soft blow 2-5min or do not blow behind the vacuum breaker, molten steel must not expose in the soft blow process, the normal online bag pumpdown time: (vacuumizing front liquid steel temperature-target temperature leaving from station)/1.7min, insulating covering agent, assurance is paved with the molten steel face, must close argon gas, 1565 ± 15 ℃ of upper steel temperature before adding insulating covering agent; In described continuous casting, guarantee that the casting machine status of equipment is good, 15 ± 10 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min before watering steel, specific water: 0.80L/ ㎏, electricity stirs: 900A, 5Hz, 30s-3-30s, continuous-casting steel pouring require the whole process protection casting, unwrap greatly to water in the rear 1min and must overlap protective tube, must guarantee not show of molten steel face in the middle bag casting process, rationally control stopper Argon amount in the steel pouring process, guarantee that liquid level fluctuation of crystallizer is slight, require cooling in heap 〉=12h after strand rolls off the production line; Pine in described adding, Heating temperature and heat-up time are as follows: 900-1000 ℃ of preheating section temperature, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-13min/cm; In described controlled rolling and controlled cooling, in conjunction with the steel-making chemical ingredients, for preventing mixed crystal and coarse grains, strictly adhere to the rolling requirement of " high temperature; low speed; depress greatly ", 1100 ℃～1150 ℃ of start rolling temperatures, the one-phase finishing temperature is at 980 ℃～1000 ℃, treat that temperature thickness is 2.2～2.5 times of finished product thickness, be finish rolling stage accumulative total deflection and crystal grain thinning, dislocations strengthening lays the foundation, two-stage start rolling temperature≤900 ℃, two-stage bonding percentage pass reduction 〉=15%, accumulative total draft 〉=60% guarantees that distortion infiltration makes the elongation that is crushed of the inner crystal grain of austenite, increase the crystal boundary useful area and effectively form a large amount of deformation bands, for austenite phase transformation provides more forming core point, reach the purpose of refine austenite crystal grain, 760～860 ℃ of finishing temperatures; Because rolling rear slow cooling easily makes grain growth, and the alloy solid solution amounts such as C, Mn in the tissue are limited, therefore to control suitable speed of cooling, in order to obtain good comprehensive mechanical property, according to the difference of thickness of slab, roll the different laminar flow cooling of rear employing, by adjusting cooling manifold group number, guarantee that speed of cooling is controlled at 3-15 ℃/S, then red temperature is sent to the straightener aligning between 610～690 ℃; In described cooling in heap, the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time 〉=24 hour.
Embodiment 1
By KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technique, obtain a kind of high-strong toughness structure iron Q460E slab, it comprises the chemical ingredients (unit of following mass percent, wt%): C:0.11, Si:0.44, Mn:1.32, P:0.017, S:0.001, Als:0.048, Nb:0.026, V:0.068, Ti:0.017, other is Fe and relict element.
Embodiment 2
By KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technique, obtain a kind of high-strong toughness structure iron Q460E slab, it comprises the chemical ingredients (unit of following mass percent, wt%): C:0.16, Si:0.22, Mn:1.63, P:0.002, S:0.006, Als:0.017, Nb:0.058, V:0.055, Ti:0.023, other is Fe and relict element.
Mechanical mechanics property is analyzed
Composition and mechanical mechanics property are pressed GB/T1591-2008 and are carried out, and mechanical property specifically sees the following form
High-strong toughness structure iron Q460E slab mechanical mechanics property
The thick high-strong toughness structure iron of this trial production 60～100mm Q460E slab amounts to 60 batches, and wherein: yield strength is controlled at 450～500 MPa, has on average reached 485 MPa, than the rich 65MPa of standard; Tensile strength is controlled at 580～710 MPa, has on average reached 685 MPa, than the rich 135MPa of standard; Elongation is controlled at 19%-25%, on average reaches 22%, than standard affluence 6%; 0 ℃ of V-type ballistic work is controlled at 150～230J, has on average reached 185J, reaches the level of Q460E fully.
Outer inspection and flaw detection: the steel plate of developing is examined outward, and the percentage of A-class goods 100% is detected a flaw by JB/T 47030, and unification level rate is 80%, and closing three grades of rates is 100%, has reached desired result.
Claims (1)
1. high-strong toughness structure iron Q460E slab, it is characterized in that: the chemical ingredients that comprises following mass percent: C:0.10～0.17, Si:0.20～0.45, Mn:1.30～1.65, P≤0.018, S≤0.007, Als:0.015～0.050, Nb:0.025～0.060, V:0.055～0.070, Ti:0.015～0.025, other is Fe and relict element, described high-strong toughness structure iron Q460E slab, carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.48, the production method of described high-strong toughness structure iron Q460E slab comprises the steps:
The a.KR hot metal pretreatment: the molten iron that arrives at a station must be taken off front slag and take off rear slag, guarantees liquid level thickness of slag layer≤20mm, and molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
B. converter smelting: enter stove molten iron S≤0.005%, P≤0.080%, molten iron temperature 〉=1270 ℃, molten iron Intake Quantity error is controlled by ± 1t, steel scrap strictly adopts the high-quality scrap stock, process rifle position is by 1.0-1.3m in early stage, mid-term 1.2-1.6m, later stage 1.0-1.1m control, slag making basicity R presses 2.5-4.0 control, tapping target P≤0.015%, C 〉=0.05%, S≤0.012%, in ladle, add Si-Al-Ba-Ca in the tapping process, manganeseirom, ferro-silicon and lime, fluorite, tap with slag before the floating plug gear before the tapping, adopt the slag stop cone pushing off the slag before tapping finishes, guarantee thickness of slag layer≤30mm, require omnidistance Argon in the converter tapping process;
C. Argon is processed: the disposable adding aluminum steel in argon station, require strong Argon 3min at the argon station, and flow 200-500NL/min, molten steel face bore hole diameter control must not be lower than 1570 ℃ at 300～500mm from argon station temperature;
D.LF refining: omnidistance Argon in the refining process, Argon intensity is regulated according to different link needs, add refining slag, basicity is pressed 4.0-6.0 control, the refinement and deoxidation agent is with calcium carbide, aluminum shot, ferrosilicon powder is main, add-on is according to oxygen level in the molten steel and make the white slag situation and add in right amount, heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions, heat-up time is by twice control, one heating 7-12min, two heating 6-10min, 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, front adding silicon-calcium wire leaving from station, must close argon gas before adding silicon-calcium wire, not adopting the upper steel temperature of vacuum outgas is 1565 ± 15 ℃, and adopting the upper steel temperature of vacuum outgas is 1610 ± 15 ℃;
The e.VD refining: VD vacuum tightness must reach below the 67Pa, dwell time is necessary 〉=15min, soft blow 2-5min or do not blow behind the vacuum breaker, molten steel must not expose in the soft blow process, the normal online bag pumpdown time is 1.7min, insulating covering agent guarantees to be paved with the molten steel face, must close argon gas, 1565 ± 15 ℃ of upper steel temperature before adding insulating covering agent;
F. continuous casting: guarantee that the casting machine status of equipment is good before watering steel, 15 ± 10 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, the specific water: 0.80L/ ㎏, electricity stirs: 900A, 5Hz, 30s-3-30s, continuous-casting steel pouring requires the whole process protection casting, unwrap greatly and water necessary cover protective tube in the rear 1min, must guarantee not show of molten steel face in the middle bag casting process, rationally control stopper Argon amount in the steel pouring process, the assurance liquid level fluctuation of crystallizer is slight, requires cooling in heap 〉=12h after strand rolls off the production line;
G. heating: Heating temperature and heat-up time are as follows: 900-1000 ℃ of preheating section temperature, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-13min/cm;
H. controlled rolling and controlled cooling: in conjunction with the steel-making chemical ingredients, for preventing mixed crystal and coarse grains, strictly adhere to the rolling requirement of " high temperature; low speed; depress greatly ", 1100 ℃～1150 ℃ of start rolling temperatures, the one-phase finishing temperature is at 980 ℃～1000 ℃, treat that temperature thickness is 2.2～2.5 times of finished product thickness, be finish rolling stage accumulative total deflection and crystal grain thinning, dislocations strengthening lays the foundation, two-stage start rolling temperature≤900 ℃, two-stage bonding percentage pass reduction 〉=15%, accumulative total draft 〉=60%, guarantee that distortion infiltration makes elongations that be crushed of the inner crystal grain of austenite, increase crystal boundary useful area and effective a large amount of deformation bands of formation, for austenite phase transformation provides more forming core point, reach the purpose of refine austenite crystal grain, 760～860 ℃ of finishing temperatures; Because rolling rear slow cooling easily makes grain growth, and the alloy solid solution amounts such as C, Mn in the tissue are limited, therefore to control suitable speed of cooling, in order to obtain good comprehensive mechanical property, according to the difference of thickness of slab, roll the different laminar flow cooling of rear employing, by adjusting cooling manifold group number, guarantee that speed of cooling is controlled at 3-15 ℃/s, then red temperature is sent to the straightener aligning between 610～690 ℃;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time 〉=24 hour.
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| CN102041434A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Steel plate for low-alloy high-strength structured steel Q460E-Z35 and production method thereof |
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