CN102345056A - Structural steel S420ML medium and heavy plate and production method thereof - Google Patents
Structural steel S420ML medium and heavy plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a structural steel S420ML medium and heavy plate comprising chemical components of, by weight: 0.12 to 0.15% of C, 0.25 to 0.40% of Si, 1.45 to 1.55% of Mn, no more than 0.017% of P, no more than 0.003% of S, 0.015 to 0.035% of Als, 0.030 to 0.040% of Nb, 0.010 to 0.020% of Ti, 0.010 to 0.020% of Ni, and balance of Fe and residual elements. The carbon equivalent is represented by that: [Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15]<=0.41. The production method of the plate comprises processes of KR hot metal pretreating, converter smelting, argon-blowing treating, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, and stack cooling. During the processes, a TMCP rolling technology and a steel plate stacking and sustained-cooling technology are adopted. With the method provided by the invention, components in S420ML can be ensured; contents of harmful elements such as P and S can be strictly controlled; a heating system in the steel rolling process is strictly controlled; during a rolling process, a finishing temperature, a self-tempering temperature and a cooling speed are strictly controlled; and methods such as a steel plate stacking and sustained-cooling technology are adopted. Therefore, performance indexes of a 20-50mm hot-rolled weldable fine-grain structural steel S420ML medium and heavy plate can reach required standards.
Description
Technical field
The invention belongs to the steel plate production technical field, be specifically related to a kind of structure iron S420ML plate of moderate thickness and working method thereof.
Background technology
In technique known, traditional S420ML Heavy Plate Production is quite loaded down with trivial details, and the steel product quality of producing also is not fine, and this improves competition and improve income for enterprise, and certain influence is all arranged.
Summary of the invention
To the problems referred to above, the present invention provides a kind of guaranteed cost, produces easy structure iron S420ML plate of moderate thickness and working method thereof.
A kind of structure iron S420ML plate of moderate thickness; Comprise following chemical components in mass percent (unit; Wt%): C:0.12～0.15, Si:0.25～0.40, Mn:1.45～1.55, P≤0.017, S≤0.003, Als:0.015～0.035, Nb:0.030～0.040, Ti:0.010～0.020, other is Fe and relict element for Ni:010～0.020.
Carbon equivalent≤0.41 of said structure iron S420ML plate of moderate thickness.
Said structure iron S420ML plate of moderate thickness thickness is 20-50mm.
For achieving the above object, the working method of said structure iron S420ML plate of moderate thickness comprises following production stage:
The KR hot metal pretreatment: before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.003% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
Converter smelting: adopt 100/120 ton of top and bottom combined blown converter; Go into and contain S≤0.003% in the stove molten iron by mass percentage; 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≤0.017%; C>=0.05%; S≤0.003%; In the tapping process in ladle Si-Al-Ba-Ca; Manganeseirom; Ferro-silicon and lime; Fluorite; Tap with slag before the floating plug retaining 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;
Argon is handled: 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 is controlled at 300～500mm, must not be lower than 1570 ℃ from argon station temperature;
LF refining: omnidistance Argon in the refining process; Add slag charge; Basicity is pressed 4.0-6.0 control; Add reductor; Heat-processed adopts electric current to heat; Heat-up time is by twice control; One heating 7-12min, two heating 6-10min; Require in two heat-processedes to add reductor, and require the dry slag number of times greater than 6 times according to the slag making situation; Add silicon-calcium wire before leaving from station; Must close argon gas before adding silicon-calcium wire, not adopt 1565 ± 15 ℃ of the last steel temperature of vacuum outgas, adopt 1610 ± 15 ℃ of the last steel temperature of vacuum outgas;
The 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 last steel temperature before adding insulating covering agent;
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; Unwrap greatly to water in the 1min of back and must overlap protective tube, steel pouring process stopper Argon requires cooling in heap >=12h after strand rolls off the production line;
Heating: Heating temperature and heat-up time are following: preheating section temperature≤1000 ℃, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-12min/cm;
Controlled rolling and controlled cooling: 1050 ℃～1150 ℃ of start rolling temperatures; One stage finishing temperature is at 980 ℃～1000 ℃; Treat that temperature thickness is 2.5～3.5 times of finished product thickness; Two-stage start rolling temperature≤900 ℃, two-stage bonding percentage pass reduction>=12%, accumulative total draft>=60%; 800～880 ℃ of finishing temperatures; Cooling rate 5-10 ℃/S, return red temperature between 640～680 ℃, be sent to the straightener aligning then;
Cooling in heap: the stacking slow cooling temperature is not less than 350 ℃, cooling in heap time >=24 hour.
The hot rolling of said 20-50mm thickness can be welded and adopted TMCP rolling technique and steel plate stacking slow cooling technology in the production of fine grained structural steel S420ML plate of moderate thickness.
Because the present invention is through KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technology, and employing TMCP rolling technique and steel plate stacking slow cooling technology.On the basis that guarantees the S420ML composition; P, S etc. influence the harmful element content of steel plate plasticity and toughness in the strict control steel; The heating cycle of strict simultaneously control steel rolling; Strictness is controlled finishing temperature, is returned red temperature and speed of cooling in the operation of rolling; Adopt methods such as steel plate stacking slow cooling, thereby guaranteed that the hot rolling of 20-50mm thickness can weld each item performance index of fine grained structural steel S420ML plate of moderate thickness and reach standard-required.In smelting process, P (phosphorus), S harmful elements such as (sulphur) guarantee that the purity of molten steel reaches the Clean Steel level basically in the strict control steel.In follow-up rolling heat-processed, thick for preventing inside steel billet crystal grain, 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 through adopting domestic advanced person can guarantee S420ML plate property demand.
Embodiment
Guaranteed cost of the present invention, produce easy structure iron S420ML plate of moderate thickness and comprise following chemical components in mass percent (unit; Wt%): C:0.12～0.15, Si:0.25～0.40, Mn:1.45～1.55, P≤0.017, S≤0.003, Als:0.015～0.035, Nb:0.030～0.040, Ti:0.010～0.020, other is Fe and relict element for Ni:010～0.020.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15]≤0.41.
For achieving the above object, the working 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 said KR hot metal pretreatment, before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.003% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃; In said converter smelting; Adopt 100/120 ton of top and bottom combined blown converter; Go into and contain S≤0.003% in the stove molten iron by mass percentage; P≤0.080%; Molten iron temperature>=1270 ℃; Molten iron Intake Quantity error is controlled by ± 1t; The strict high-quality scrap stock that adopt of steel scrap; 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≤0.017%; C>=0.05%; S≤0.003%; In the tapping process in ladle Si-Al-Ba-Ca; Manganeseirom; Ferro-silicon and lime; Fluorite; Tap with slag before the floating plug retaining 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 said Argon was handled, 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 is controlled at 300～500mm, must not be lower than 1570 ℃ from argon station temperature; In said 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 in two heat-processedes to add reductor according to the slag making situation; And require the dry slag number of times greater than 6 times; Add silicon-calcium wire before leaving from station, must close argon gas, 1565 ± 15 ℃ of last steel temperature (not adopting vacuum outgas)/1610 ± 15 ℃ (employing vacuum outgas) before adding silicon-calcium wire; In said 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 preceding 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 last steel temperature before adding insulating covering agent; In said 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 and water necessary cover protective tube in the 1min of back; 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 said adding, Heating temperature and heat-up time are following: preheating section temperature≤1000 ℃, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-12min/cm; In said controlled rolling and controlled cooling; In conjunction with the steel-making chemical ingredients; Thick for preventing mixed crystal and crystal grain; The rolling requirement of " high temperature; low speed; depress greatly " is adhered in strictness; 1050 ℃～1150 ℃ of start rolling temperatures; One stage finishing temperature is at 980 ℃～1000 ℃; Treat that temperature thickness is 2.5～3.5 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>=12%; Accumulative total draft>=60%; Guarantee 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; 800～880 ℃ of finishing temperatures are prone to make grain growth owing to roll the back slow cooling, and the C in the tissue; Alloy solid solution amounts such as Mn are limited; Therefore to control suitable speed of cooling; In order to obtain good comprehensive mechanical property,, roll the back and adopt different laminar flow coolings according to the difference of thickness of slab; Through adjustment cooling manifold group number; Cooling rate 5-10 ℃/S, return red temperature between 640～680 ℃, be sent to the straightener aligning then; In said cooling in heap, the stacking slow cooling temperature is not less than 350 ℃, cooling in heap time>=24 hour.
Embodiment 1
Through KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technology; Obtain the hot rolling of a kind of 20-50mm thickness and can weld fine grained structural steel S420ML plate of moderate thickness; It comprises following chemical components in mass percent (unit; Wt%): C:0.13, Si:0.38, Mn:1.47, P:0.014, S:0.001, Als:0.033, Nb:0.028, Ti:0.018, other is Fe and relict element for Ni:010.
Embodiment 2
Through KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap technology; Obtain the hot rolling of a kind of 20-50mm thickness and can weld fine grained structural steel S420ML plate of moderate thickness; It comprises following chemical components in mass percent (unit; Wt%): C:0.15, Si:0.27, Mn:1.53, P:0.003, S:0.003, Als:0.017, Nb:0.038, Ti:0.010, other is Fe and relict element for Ni:0.018.
Mechanical mechanics property is analyzed
Composition and mechanical mechanics property are pressed EN10025-4:2004 and are carried out, and mechanical property specifically sees the following form 1
The hot rolling of table 1 20-50mm thickness can be welded fine grained structural steel S420ML plate of moderate thickness mechanical mechanics property
Impact of collision merit performance requriements:
Transverse impact merit performance requriements:
The thick S420ML of this trial production 20～50mm amounts to 25 batches, and wherein: yield strength is controlled at 410～460 MPa, has on average reached 440 MPa, than the rich 50MPa of standard; Tensile strength is controlled at 540～640 MPa, has on average reached 600 MPa, than the rich 100MPa of standard; Elongation is controlled at 20%-24%, on average reaches 22%, than standard rich 3%; The average rich amount of V-type ballistic work reaches 110MPa, reaches the level of S420ML fully.
Outer inspection and flaw detection: the steel plate of being developed 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 (5)
1. structure iron S420ML plate of moderate thickness; It is characterized in that: comprise following chemical components in mass percent (unit; Wt%): C:0.12～0.15, Si:0.25～0.40, Mn:1.45～1.55, P≤0.017, S≤0.003, Als:0.015～0.035, Nb:0.030～0.040, Ti:0.010～0.020, other is Fe and relict element for Ni:010～0.020.
2. a kind of structure iron S420ML plate of moderate thickness as claimed in claim 1 is characterized in that: carbon equivalent≤0.41 of said structure iron S420ML plate of moderate thickness.
3. a kind of structure iron S420ML plate of moderate thickness as claimed in claim 1 is characterized in that: said structure iron S420ML plate of moderate thickness thickness is 20-50mm.
4. the working method of a kind of structure iron S420ML plate of moderate thickness as claimed in claim 1 is characterized in that: comprise following production stage:
The KR hot metal pretreatment: before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.003% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃;
Converter smelting: adopt 100/120 ton of top and bottom combined blown converter; Go into and contain S≤0.003% in the stove molten iron by mass percentage; 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≤0.017%; C>=0.05%; S≤0.003%; In the tapping process in ladle Si-Al-Ba-Ca; Manganeseirom; Ferro-silicon and lime; Fluorite; Tap with slag before the floating plug retaining 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;
Argon is handled: 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 is controlled at 300～500mm, must not be lower than 1570 ℃ from argon station temperature;
LF refining: omnidistance Argon in the refining process; Add slag charge; Basicity is pressed 4.0-6.0 control; Add reductor; Heat-processed adopts electric current to heat; Heat-up time is by twice control; One heating 7-12min, two heating 6-10min; Require in two heat-processedes to add reductor, and require the dry slag number of times greater than 6 times according to the slag making situation; Add silicon-calcium wire before leaving from station; Must close argon gas before adding silicon-calcium wire, not adopt 1565 ± 15 ℃ of the last steel temperature of vacuum outgas, adopt 1610 ± 15 ℃ of the last steel temperature of vacuum outgas;
The 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 last steel temperature before adding insulating covering agent;
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; Unwrap greatly to water in the 1min of back and must overlap protective tube, steel pouring process stopper Argon requires cooling in heap >=12h after strand rolls off the production line;
Heating: Heating temperature and heat-up time are following: preheating section temperature≤1000 ℃, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 8-12min/cm;
Controlled rolling and controlled cooling: 1050 ℃～1150 ℃ of start rolling temperatures; One stage finishing temperature is at 980 ℃～1000 ℃; Treat that temperature thickness is 2.5～3.5 times of finished product thickness; Two-stage start rolling temperature≤900 ℃, two-stage bonding percentage pass reduction>=12%, accumulative total draft>=60%; 800～880 ℃ of finishing temperatures; Cooling rate 5-10 ℃/S, return red temperature between 640～680 ℃, be sent to the straightener aligning then;
Cooling in heap: the stacking slow cooling temperature is not less than 350 ℃, cooling in heap time >=24 hour.
5. structure iron S420ML plate of moderate thickness as claimed in claim 1 is characterized in that: adopt TMCP rolling technique and steel plate stacking slow cooling technology in the production of said structure iron S420ML plate of moderate thickness.
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| CN103710620A (en) * | 2013-12-26 | 2014-04-09 | 南阳汉冶特钢有限公司 | Large-thickness steel plate for low-temperature pressure container and production process thereof |
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| CN104561784A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Steel BB503 steel plate for blast furnace housing as well as production method of steel BB503 steel plate |
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| CN107312972B (en) * | 2017-05-27 | 2019-01-29 | 内蒙古包钢钢联股份有限公司 | The preparation method of the steel construction earthquake-resistant hot rolled H profile steel of Q390KZ |
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| CN112322994A (en) * | 2020-11-04 | 2021-02-05 | 南阳汉冶特钢有限公司 | Method for producing low-cost Q355B medium plate through medium plate alloy leftover material |
| CN113528966A (en) * | 2021-07-19 | 2021-10-22 | 新疆八一钢铁股份有限公司 | Production method of steel plate with thickness of 50-80mm for building structure |
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Application publication date: 20120208 |