CN102345055A - Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method - Google Patents

Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method Download PDF

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Publication number
CN102345055A
CN102345055A CN2011101766762A CN201110176676A CN102345055A CN 102345055 A CN102345055 A CN 102345055A CN 2011101766762 A CN2011101766762 A CN 2011101766762A CN 201110176676 A CN201110176676 A CN 201110176676A CN 102345055 A CN102345055 A CN 102345055A
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steel
temperature
cooling
slag
steel plate
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朱书成
高照海
许少普
张立新
崔冠军
李忠波
袁永旗
于飒
李亮亮
刘庆波
赵迪
贾涛
张强
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Nanyang Hanye Special Steel Co Ltd
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Nanyang Hanye Special Steel Co Ltd
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Abstract

The invention discloses a weldable fine grain structural steel S355NL/S355NLZ35 steel plate, which comprises the following chemical components by wt%: 0.10-0.18of C, 0.20-0.45 of Si, 1.20-1.45 of Mn, less than or equal to 0.018 of P, less than or equal to 0.005 of S, 0.015-0.050 of Als, 0.010-0.055 of V, 0.005-0.025 of Ti, and the balance Fe and residual elements. The production method consists of: KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing. According to the invention, content and proportion of C, Mn and Nb alloy elements are adjusted properly, and content of harmful elements in steel like P and S etc. influencing the plasticity and toughness of the steel plate is strictly controlled, and meanwhile, the heating system of steel rolling is strictly controlled. The rolling process employs a mode of lowering finish rolling temperature, speeding up cooling after rolling, and conducting steel plate stacking and slowing cooling after rolling, thus guaranteeing all performance indexes of the weldable fine grain structural steel S355NL/S355NLZ35 steel plate meeting the standard requirements.

Description

A kind of fine grained structural steel S355NL/S355NLZ35 steel plate and working method thereof of welding
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Technical field
The invention belongs to the Heavy Plate Production technical field, be specifically related to a kind of fine grained structural steel S355NL/S355NLZ35 steel plate and working method thereof of welding.
Background technology
In technique known, traditional S355NL/S355NLZ35 steel plate production need be carried out normalizing treatment, makes production energy consumption increase like this, and production cost increases, and is very unfavorable with competition to enterprise development.
Summary of the invention
To the problems referred to above, the present invention provides a kind of and saves cost, produces easy welded fine grained structural steel S355NL/S355NLZ35 steel plate and working method thereof.
A kind of fine grained structural steel S355NL/S355NLZ35 steel plate that welds; Comprise following chemical components in mass percent (unit; Wt%): C:0.10~0.18, Si:0.20~0.45, Mn:1.20~1.45, P≤0.018, S≤0.005, Als:0.015~0.050, V:0.010~0.055, Ti:0.005~0.025, other is Fe and relict element.
The carbon equivalent of said chemical ingredients≤0.43.
It is said that to weld fine grained structural steel S355NL/S355NLZ35 steel plate thickness be 20-80mm.
For achieving the above object, said working method of welding fine grained structural steel S355NL/S355NLZ35 steel plate, it 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 and contain S≤0.005% 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≤0.015%; 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 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;
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;
D.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, and 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.Add silicon-calcium wire before leaving from station, must close argon gas before adding silicon-calcium wire, do not adopt 1565 ± 15 ℃ of the last steel temperature of vacuum outgas, 1610 ± 15 ℃ of the last steel temperature of employing 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 last 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 and waters necessary cover protective tube in the 1min of back, requires cooling in heap >=12h 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 7-13min/cm;
H. controlled rolling and controlled cooling: 1100 ℃~1150 ℃ of start rolling temperatures; One stage finishing temperature is at 900 ℃~1000 ℃; Treat that temperature thickness is 2~3 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 1-6 ℃/S, return red temperature between 650~750 ℃, be sent to the straightener aligning then;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time >=12 hour;
J. normalizing: temperature is 900 ℃ ± 20 ℃.
Because the present invention is through the KR hot metal pretreatment; Converter smelting; Argon is handled; The LF refining; The VD refining; Continuous casting; Heating; Controlled rolling and controlled cooling; Cooling in heap; Normalizing process; Suitably adjust C; Mn; The content of Nb alloying element and ratio; And P in the strict control steel; S etc. influence the harmful element content of steel plate plasticity and toughness; The heating cycle of strict simultaneously control steel rolling; The operation of rolling adopts and reduces finishing temperature; Roll the back and improve speed of cooling and the mode of rolling back steel plate stacking slow cooling, thereby guaranteed that each item performance index that can weld fine grained structural steel S355NL/S355NLZ35 steel plate 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 to weld fine grained structural steel S355NL/S355NLZ35 plate property demand.Under the constant situation of traditional S355NL/S355NLZ35 steel plate carbon equivalent, under the situation of low alloyed element add-on, through TMCP rolling with steel plate stacking slow cooling and normalizing mode, guaranteed that plate property reaches standard-required, greatly reduces production cost.
Embodiment
Saving cost of the present invention, produce easy welded fine grained structural steel S355NL/S355NLZ35 steel plate and comprise following chemical components in mass percent (unit; Wt%): C:0.10~0.18, Si:0.20~0.45, Mn:1.20~1.45, P≤0.018, S≤0.005, Als:0.015~0.050, V:0.010~0.055, Ti:0.005~0.025, other is Fe and relict element.
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, normalizing.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 and contain S≤0.005% 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≤0.015%; 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 4.0-6.0 control; 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; Heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions; Heat-up time, one heating 7-12min, two heating 6-10min required in two heat-processedes according to the slag making situation by twice control; Add reductor, 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: 900-1000 ℃ of preheating section temperature, 1220-1280 ℃ of heating zone temperature, 1200-1260 ℃ of holding-zone temperature, rate of heating 7-13min/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; 1100 ℃~1150 ℃ of start rolling temperatures; One stage finishing temperature treats that at 900 ℃~1000 ℃ temperature thickness is 2~3 times of finished product thickness, for finish rolling stage accumulative total deflection and crystal grain thinning, dislocations strengthening lay the foundation.Two-stage start rolling temperature≤900 ℃; Two-stage bonding percentage pass reduction>=15%; 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, 760~860 ℃ of finishing temperatures; Be 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 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; Guarantee that speed of cooling is controlled at 1-6 ℃/S, return red temperature between 650~750 ℃, be sent to the straightener aligning then; In said cooling in heap, the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time>=12 hour; In said normalizing, temperature is 900 ℃ ± 20 ℃.
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, normalizing process; Obtain a kind of fine grained structural steel S355NL/S355NLZ35 steel plate that welds; It comprises following chemical components in mass percent (unit; Wt%): C:0.16, Si:0.35, Mn:1.40, P:0.015, S:0.003, Als:0.025, V:0.025, Ti:0.020, other is Fe and relict element.
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, normalizing process; Obtain a kind of fine grained structural steel S355NL/S355NLZ35 steel plate that welds; It comprises following chemical components in mass percent (unit; Wt%): C:0.12, Si:0.43, Mn:1.20, P:0.017, S:0.001, Als:0.040, V:0.015, Ti:0.025, other is Fe and relict element.
Mechanical mechanics property is analyzed
Composition and mechanical mechanics property are pressed EN10025-1 and are carried out, and mechanical mechanics property specifically sees the following form 1
Table 1 can weld fine grained structural steel S355NL/S355NLZ35 steel plate mechanical mechanics property
The thick fine grained structural steel S355NL/S355NLZ35 steel plate that welds of this trial production 20~80mm amounts to 120 batches, and wherein: yield strength is controlled at 370~430 MPa, has on average reached 390 MPa; Tensile strength is controlled at 500~560 MPa, has on average reached 520MPa; Elongation is controlled at 24%-32%, on average reaches 28%;-40 ℃ of V-type ballistic works are controlled at 180~230J, have on average reached 212J, and Z on average reaches 50% to being controlled at 38-61%, reaches the level of S335K2Z35 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 90%, and closing three grades of rates is 100%, has reached desired result.

Claims (4)

1. one kind can be welded fine grained structural steel S355NL/S355NLZ35 steel plate; It is characterized in that: comprise following chemical components in mass percent (unit; Wt%): C:0.10~0.18, Si:0.20~0.45, Mn:1.20~1.45, P≤0.018, S≤0.005, Als:0.015~0.050, V:0.010~0.055, Ti:0.005~0.025, other is Fe and relict element.
2. the fine grained structural steel S355NL/S355NLZ35 steel plate that welds as claimed in claim 1 is characterized in that: the carbon equivalent of said chemical ingredients≤0.43.
3. the fine grained structural steel S355NL/S355NLZ35 steel plate that welds as claimed in claim 1 is characterized in that: said to weld fine grained structural steel S355NL/S355NLZ35 steel plate thickness be 20-80mm.
4. working method of welding fine grained structural steel S355NL/S355NLZ35 steel plate as claimed in claim 1 is characterized in that: comprise 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 and contain S≤0.005% 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≤0.015%; 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 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;
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, add slag charge, basicity is pressed 4.0-6.0 control; Add reductor; Heat-processed adopts electric current to heat, and 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; Do not adopt 1565 ± 15 ℃ of the last steel temperature of vacuum outgas, adopt 1610 ± 15 ℃ of the last 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 last 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 and waters necessary cover protective tube in the 1min of back, requires cooling in heap >=12h 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 7-13min/cm;
H. controlled rolling and controlled cooling: 1100 ℃~1150 ℃ of start rolling temperatures; One stage finishing temperature is at 900 ℃~1000 ℃; Treat that temperature thickness is 2~3 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 1-6 ℃/S, return red temperature between 650~750 ℃, be sent to the straightener aligning then;
I. cooling in heap: the stacking slow cooling temperature is not less than 250 ℃, cooling in heap time >=12 hour;
J. normalizing: temperature is 900 ℃ ± 20 ℃.
CN2011101766762A 2011-06-28 2011-06-28 Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method Pending CN102345055A (en)

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CN103160739A (en) * 2013-03-16 2013-06-19 南阳汉冶特钢有限公司 Continuously cast 80mm-thick bridge steel Q420qE and preparation process thereof
CN103757549A (en) * 2014-01-08 2014-04-30 鞍钢股份有限公司 355MPa-class thick plate and production method thereof
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CN105177442A (en) * 2015-08-19 2015-12-23 山东西王特钢有限公司 Low-alloy high-strength steel billet and manufacturing method thereof
CN105200187A (en) * 2015-09-23 2015-12-30 舞阳钢铁有限责任公司 Process method for increasing thickness of finished continuous casting billet
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CN103160739B (en) * 2013-03-16 2015-09-30 南阳汉冶特钢有限公司 A kind of continuous casting 80mm thickness Bridge Steel Q420qE and preparation technology thereof
CN103160739A (en) * 2013-03-16 2013-06-19 南阳汉冶特钢有限公司 Continuously cast 80mm-thick bridge steel Q420qE and preparation process thereof
CN103757549A (en) * 2014-01-08 2014-04-30 鞍钢股份有限公司 355MPa-class thick plate and production method thereof
CN103934423B (en) * 2014-04-03 2016-03-30 莱芜钢铁集团有限公司 A kind of method of the continuous cast round billets for the production of wind-power tower flange steel
CN103934423A (en) * 2014-04-03 2014-07-23 莱芜钢铁集团有限公司 Method for producing continuous casting round billet of wind power tower cylinder flange steel
CN104498826A (en) * 2014-12-26 2015-04-08 南阳汉冶特钢有限公司 Continuously cast 140-mm thick plate Q345E and production method thereof
CN104561801A (en) * 2014-12-31 2015-04-29 南阳汉冶特钢有限公司 Structural alloy steel 12CrMoV steel plate and production method thereof
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
CN105177442A (en) * 2015-08-19 2015-12-23 山东西王特钢有限公司 Low-alloy high-strength steel billet and manufacturing method thereof
CN105200187A (en) * 2015-09-23 2015-12-30 舞阳钢铁有限责任公司 Process method for increasing thickness of finished continuous casting billet
CN106222548A (en) * 2016-07-25 2016-12-14 武汉钢铁股份有限公司 The low yield strength ratio structural steel for bridge of normalizing rolling and production method thereof
CN106222548B (en) * 2016-07-25 2017-11-10 武汉钢铁有限公司 The low yield strength ratio structural steel for bridge and its production method of normalizing rolling
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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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