CN102367542A - Deformation aging performance-guaranteed S355K2-Z35 moderately thick plate and production method thereof - Google Patents
Deformation aging performance-guaranteed S355K2-Z35 moderately thick plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a deformation aging performance-guaranteed S355K2-Z35 moderately thick plate. The moderately thick plate comprises the following chemical components: 0.07-0.17 wt% of C, 0.20-0.45 wt% of Si, 1.30-1.55 wt% of Mn, equal to or less than 0.018 wt% of P, equal to or less than 0.007 wt% of S, 0.010-0.050 wt% of AlS, equal to or less than 0.090 wt% of Nb+V+Ti, and the balance Fe and residual elements. A technology comprising Steps of KR molten iron pretreatment, converter smelting, argon blow treatment, LF refining, VD refining, continuous casting, heating, rolling and cooling control, and pile cooling is optimized to appropriately adjust contents of alloy elements of C, Mn, Nb, V, and Ti on the basis of an original component of an S355K2 high obdurability structure steel, and strictly control contents of harmful elements consisting of P, S and the like which influence the ductility and toughness of the steel plate, so a process route for producing clean steel is adopted; the heating system of steel rolling is strictly controlled, two-phase high pressure rolling is carried out in the rolling process, the cooling speed after rolling is improved, and a slow stacking cooling mode of steel plates after rolling is adopted, so the deformation ageing performance and all routine performance indexes of S355K2-Z35 steel are guaranteed to reach standard requirements.
Description
Technical field
The invention belongs to the steel plate technical field of producing, be specifically related to a kind of conformal and become aging performance S355K2-Z35 plate and working method thereof.
Background technology
Along with the increasingly stringent of market to the plate quality class requirement, conformal becomes reasons such as aging performance S355K2-Z35 plate is big with its production difficulty, the tooling requirement is special can't produce, and working method is very immature, still is in the exploratory stage.
Summary of the invention
The present invention provides a kind of strain ageing sexual satisfaction market requirement, produces easy conformal change aging performance S355K2-Z35 plate and working method thereof.
A kind of conformal becomes aging performance S355K2-Z35 plate; Comprise following chemical components in mass percent (unit; Wt%): C:0.07～0.17, Si:0.20～0.45, Mn:1.30～1.55, P≤0.018, S≤0.007, Als:0.010～0.050, Nb+V+Ti≤0.090, other is Fe and relict element.
Said conformal becomes carbon equivalent≤0.43 of aging performance S355K2-Z35 plate.
Said conformal becomes aging performance S355K2-Z35 plate thickness and is 40-63mm.
For achieving the above object, the working method that said conformal change aging performance S355K2-Z35 plate is taked comprises the steps:
The a.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≤0.005% 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; Go into to contain S≤0.005% in the stove molten iron by mass percentage, contain P≤0.080%, molten iron temperature>=1270 ℃, 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, manganeseirom, ferro-silicon and lime, fluorite in the tapping process, with slag tapping before the floating plug retaining, adopt the slag stop cone pushing off the slag before tapping finishes before the tapping; Guarantee thickness of slag layer≤30mm, require omnidistance Argon in the converter tapping process;
C. 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;
The d.LF refining: omnidistance Argon in the refining process, basicity are pressed 3.0-6.0 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 require the dry slag number of times greater than 6 times, and add silicon-calcium wire before leaving from station, must close argon gas before adding silicon-calcium wire;
The e.VD refining: VD vacuum tightness must reach below the 67Pa; Dwell time is necessary >=15min, and 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;
F. continuous casting: 15 ± 10 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, the specific water: 8# water meter, continuous-casting steel pouring require the whole process protection casting, water steel and use the stopper Argon, require cooling in heap >=24h after strand rolls off the production line;
G. heating: Heating temperature and heat-up time are following: 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: 1020 ℃～1120 ℃ of start rolling temperatures, 760～860 ℃ of finishing temperatures, speed of cooling is controlled at 3-13 ℃/S, returns red temperature between 600～680 ℃, is sent to the straightener aligning then;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time >=24 hour.
Since technical process of the present invention from obtain high-quality molten iron, KR hot metal pretreatment, converter smelting, Argon processing, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, cooling in heap, finishing, normalizing, outside the warehouse-in of examining, detect a flaw; Through optimizing technical process; On the composition basis of original S355K2 high-strong toughness structure iron; Suitably adjust the content and the ratio of C, Mn, Nb, V, Ti alloying element; And P, S etc. influences the harmful element content of steel plate plasticity and toughness in the strict control steel, take the operational path of Clean Steel production; The heating cycle of strict simultaneously control steel rolling; The operation of rolling adopt the two-stage depress greatly rolling, roll the mode that the back is improved speed of cooling and rolled back steel plate stacking slow cooling, thereby guaranteed that the strain ageing performance of S355K2-Z35 steel grade steel plate and each item traditional performance index reach standard-required.In smelting process, P (phosphorus), S (sulphur) harmful element of etc.ing in quality and the molten steel of stove supplementary material are gone in strict control, guarantee the homogeneity of molten steel composition and temperature, take vacuum degassing process, and the purity of assurance molten steel reaches the Clean Steel level basically; In casting cycle, take the casting of whole process protection and low overheat, guarantee the cooling in heap effect after steel billet cuts; In follow-up rolling heat-processed, 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 S355K2-Z35 plate property demand.Like this, outside assurance S355K2-Z35 steel plate each item traditional performance is up to state standards requirement, make the strain ageing performance satisfy the market requirement simultaneously; Simplify production technique simultaneously, reduce production energy consumption, greatly reduce production cost.
Embodiment
The strain ageing sexual satisfaction market requirement of the present invention, produce easy conformal and become aging performance S355K2-Z35 plate and comprise following chemical components in mass percent (unit; Wt%): C:0.07～0.17, Si:0.20～0.45, Mn:1.30～1.55, P≤0.018, S≤0.007, Als:0.010～0.050, Nb+V+Ti≤0.090, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.43.
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≤0.005% 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 to contain S≤0.005% in the stove molten iron by mass percentage, contain P≤0.080%; Molten iron temperature>=1270 ℃; 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 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 3.0-6.0 control, and the refinement and deoxidation agent is main with calcium carbide, aluminum shot, ferrosilicon powder; Add-on is according to oxygen level in the molten steel and make the white slag situation and add in right amount, and heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions, and 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, and add silicon-calcium wire before leaving from station, must close argon gas before adding silicon-calcium wire; In said VD refining, VD vacuum tightness must reach below the 67Pa, and the 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, it is good to water the preceding assurance of steel casting machine status of equipment, 15 ± 10 ℃ of middle bag superheating temperature; Pulling rate: 0.7m/min, the specific water: 8# water meter, continuous-casting steel pouring require the whole process protection casting; Reduce the secondary oxidation of molten steel as much as possible; Rationally control stopper Argon amount in the steel pouring process, guarantee that liquid level fluctuation of crystallizer is slight, require cooling in heap>=24h after strand rolls off the production line; Pine in said adding, Heating temperature and heat-up time are following: 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 said controlled rolling and controlled cooling, in conjunction with the steel-making chemical ingredients, the rolling requirement of " high temperature, low speed, depress greatly ", 1020 ℃～1120 ℃ of start rolling temperatures are adhered in strictness; Rolling in strict accordance with rolling relevant criterion of two-stage, 760～860 ℃ of finishing temperatures are prone to make grain growth owing to roll the back slow cooling; And alloy solid solution amounts such as the C in the tissue, Mn are limited, therefore will control suitable speed of cooling, in order to obtain good comprehensive mechanical property; According to the difference of thickness of slab, roll the back and adopt different laminar flow coolings, through adjustment cooling manifold group number; Guarantee that speed of cooling is controlled at 3-13 ℃/S, return red temperature between 600～680 ℃, be sent to the straightener aligning then; In said cooling in heap; Adopt high temperature cooling in heap technology can effectively avoid because of cooling off the unrelieved stress that produces fast; Can reduce simultaneously the content of hydrogen in the steel plate greatly, fully realize thermal diffusion effect, improve the steel plate inspection defective; Steel plate stacking slow cooling technology is following: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time>=24 hour.
Utilize the present invention; On the composition basis of original S355K2 high-strong toughness structure iron; The suitably content and the ratio of adjustment C, Mn, Nb, V, Ti alloying element, and P, S etc. influences the harmful element content of steel plate plasticity and toughness in the strict control steel, take the operational path of Clean Steel production; The heating cycle of strict simultaneously control steel rolling; The operation of rolling adopt the two-stage depress greatly rolling, roll the mode that the back is improved speed of cooling and rolled back steel plate stacking slow cooling, thereby guaranteed that the strain ageing performance of S355K2-Z35 steel grade steel plate and each item traditional performance index reach standard-required.In smelting process, P (phosphorus), S (sulphur) harmful element of etc.ing in quality and the molten steel of stove supplementary material are gone in strict control, guarantee the homogeneity of molten steel composition and temperature, take vacuum degassing process, and the purity of assurance molten steel reaches the Clean Steel level basically; In casting cycle, take the casting of whole process protection and low overheat, guarantee the cooling in heap effect after steel billet cuts; In follow-up rolling heat-processed, 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 S355K2-Z35 plate property demand.
Embodiment one:
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 a kind of conformal and become aging performance S355K2-Z35 plate; Comprise following chemical components in mass percent (unit; Wt%): C:0.08, Si:0.44, Mn:1.31, P:0.018, S:0.001, Als:0.049, Nb+V+Ti:0.001, other is Fe and relict element.
Embodiment two:
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 a kind of conformal and become aging performance S355K2-Z35 plate; Comprise following chemical components in mass percent (unit; Wt%): C:0.17, Si:0.21, Mn:1.54, P:0.003, S:0.005, Als:0.010, Nb+V+Ti:0.060, other is Fe and relict element.
Composition design: on the composition basis of S355K2 high-strong toughness structure iron; The content and the ratio of C, Mn, Nb, V, Ti alloying element in suitably adjusting wherein; Smelt through Clean Steel; Strict control P, S content through carrying out strict rolling low-carbon-equivalent and the weldableness that had both guaranteed steel plate of TMCP, have ensured the strain ageing performance again.
Composition and mechanical mechanics property press EN10027-1 and CR10260 carries out, and mechanical property specifically sees the following form.
The thick S355K2-Z35 of this trial production 40～63mm amounts to 67 batches, and wherein: ys is controlled at 350～425MPa, has on average reached 373 MPa, than the rich 38MPa of standard; Tensile strength is controlled at 495～545MPa, has on average reached 521MPa, than the rich 51MPa of standard; Elongation is controlled at 21%-33%, on average reaches 26.9%, than standard rich 6.9%;-20 ℃ of V-type ballistic works are controlled at 117～277J, have on average reached 188.8J, and-20 ℃ of strain ageing ballistic works are controlled at 80～195J, have on average reached 96.6J, have reached the level of S355K2-Z35 fully and have satisfied the requirement of market to strain ageing.
Outer inspection and flaw detection: the steel plate of being developed is examined outward, the percentage of A-class goods 100%; Detect a flaw by EN10060-1991, unification level rate is 82%, and closing three grades of rates is 100%, has reached desired result.
Claims (4)
1. a conformal becomes aging performance S355K2-Z35 plate; It is characterized in that: comprise following chemical components in mass percent (unit; Wt%): C:0.12～0.20, Si:0.17～0.30, Mn:0.50～0.90, P :≤0.018, S :≤0.005, Nb+V+Ti≤0.050, Als:0.015～0.050, other is Fe and relict element.
2. conformal as claimed in claim 1 becomes aging performance S355K2-Z35 plate, it is characterized in that: said conformal becomes carbon equivalent≤0.43 of aging performance S355K2-Z35 plate.
3. conformal as claimed in claim 1 becomes aging performance S355K2-Z35 plate, it is characterized in that:
Said conformal becomes aging performance S355K2-Z35 plate thickness and is 40-63mm.
4. conformal as claimed in claim 1 becomes aging performance S355K2-Z35 plate, and it is characterized in that: its working method comprises the steps:
The a.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≤0.005% 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; Go into to contain S≤0.005% in the stove molten iron by mass percentage, contain P≤0.080%, molten iron temperature>=1270 ℃, 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 ladle Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite, with slag tapping before the floating plug retaining, adopt the slag stop cone pushing off the slag before tapping finishes before the tapping; Guarantee thickness of slag layer≤30mm, require omnidistance Argon in the converter tapping process;
C. 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;
The d.LF refining: omnidistance Argon in the refining process, basicity are pressed 3.0-6.0 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 require the dry slag number of times greater than 6 times, and add silicon-calcium wire before leaving from station, must close argon gas before adding silicon-calcium wire;
The e.VD refining: VD vacuum tightness must reach below the 67Pa; Dwell time is necessary >=15min, and 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;
F. continuous casting: 15 ± 10 ℃ of middle bag superheating temperature, pulling rate: 0.7m/min, the specific water: 8# water meter, continuous-casting steel pouring require the whole process protection casting, water steel and use the stopper Argon, require cooling in heap >=24h after strand rolls off the production line;
G. heating: Heating temperature and heat-up time are following: 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: 1020 ℃～1120 ℃ of start rolling temperatures, 760～860 ℃ of finishing temperatures, speed of cooling is controlled at 3-13 ℃/S, returns red temperature between 600～680 ℃, is sent to the straightener aligning then;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time >=24 hour.
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| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloyed 460MPa thick plate and manufacturing method thereof |
| CN103602892A (en) * | 2013-10-22 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Thick steel plate and production method thereof |
| CN103882295A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Low-temperature high-toughness V-N alloyed ship plate steel and manufacturing method thereof |
| CN109706395A (en) * | 2019-01-03 | 2019-05-03 | 南京钢铁股份有限公司 | A kind of S355J2 steel plate used for wind power generation and low-cost manufacture method |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN112695251A (en) * | 2020-12-21 | 2021-04-23 | 本钢板材股份有限公司 | Production method of thick seaside building structure steel S355G11M hot-rolled coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloyed 460MPa thick plate and manufacturing method thereof |
| CN103882295A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Low-temperature high-toughness V-N alloyed ship plate steel and manufacturing method thereof |
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| CN109706395A (en) * | 2019-01-03 | 2019-05-03 | 南京钢铁股份有限公司 | A kind of S355J2 steel plate used for wind power generation and low-cost manufacture method |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN111673059B (en) * | 2020-07-28 | 2022-05-03 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN112695251A (en) * | 2020-12-21 | 2021-04-23 | 本钢板材股份有限公司 | Production method of thick seaside building structure steel S355G11M hot-rolled coil |
| CN112877596A (en) * | 2021-01-06 | 2021-06-01 | 广东韶钢松山股份有限公司 | Method for replacing B in European standard S450J0 steel plate with Cr and method for manufacturing Cr-containing S450J0 steel plate |
| CN112877596B (en) * | 2021-01-06 | 2021-11-16 | 广东韶钢松山股份有限公司 | Method for replacing B in European standard S450J0 steel plate with Cr and method for manufacturing Cr-containing S450J0 steel plate |
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Application publication date: 20120307 |