CN102912221B - Large-thickness structural steel plate for high-rise building and production method thereof - Google Patents

Large-thickness structural steel plate for high-rise building and production method thereof Download PDF

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CN102912221B
CN102912221B CN201210387699.2A CN201210387699A CN102912221B CN 102912221 B CN102912221 B CN 102912221B CN 201210387699 A CN201210387699 A CN 201210387699A CN 102912221 B CN102912221 B CN 102912221B
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steel plate
stacking
temperature
steel
rolling
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CN201210387699.2A
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CN102912221A (en
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韦明
赵文忠
李红文
王亚琪
刘丹
胡丽周
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舞阳钢铁有限责任公司
河北钢铁集团有限公司
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Abstract

The invention relates to a large-thickness structural steel plate for a high-rise building and further relates to a production method of the steel plate at the same time. The steel plate is formed by melting the following component percentages by weight: 0.16-0.19% of C, not more than 0.55% of Si, 1.40-1.55% of Mn, not more than 0.012% of P, not more than 0.003% of S, 0.020-0.050% of TAl (total aluminum), 0.020-0.30% of Nb, 0.035-0.050% of V, not more than 0.30% of Ni, not more than 0.30% of Cr, not more than 0.05% of Ti, and the balance of Fe and inevitable impurities. The production method comprises the steps as follows: smelting; refining; continuously casting; stacking; heating; rolling; stacking and slowly cooling; detecting defects; normalizing; and obtaining the finished steel plate. The shop sign of the steel plate is Q390GJC/Z35, the delivery state of the steel plate is normalization, continuous casting blanks with cross sections of 330 mm * 2400 mm are adopted to form the steel plate, the maximum thickness of the steel plate is 120 mm, and the requirements of the level II in the JB/T4730.3-2005 detection standard are met; and the steel plate has the characteristics of capability of being formed by the continuous casting blanks, larger thickness, higher strength and toughness, good lamellar tearing resistance and the like, and is suitable for manufacturing structural members for the high-rise building.

Description

A kind of big thickness tall building structural steel and iron and production method thereof
Technical field
The present invention relates to, with a kind of big thickness tall building structural steel and iron, also relate to a kind of production method of this steel plate simultaneously.
Background technology
The steel plate maximum ga(u)ge 100mm of regulation in GB/T19879-2005 " steel plate for building structure ", and the building structure steel plate thickness of actual market demand has reached 120mm, and internal soundness will reach the requirement of international (GB/T2970-2004 or JB/T4730-2005) II level non-destructive testing standard.With regard to current prior art, the above structural steel and iron for building of thickness 100mm is all to adopt large steel ingot rolling to become a useful person, and has the shortcoming that lumber recovery is low, cost is high, price is high, has affected production and the use of this kind of steel plate.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of large thickness (thickness reaches 120mm, exceeds GB scope), low cost Highrise buildings structural steel and iron.This steel plate is to be become a useful person by continuous casting billet milling, and lumber recovery improves 13%, has large thickness, low cost, internal soundness and reach the feature of II level non-destructive testing standard in JB/T4730.3-2005.
To achieve these goals, the technical solution used in the present invention is a kind of structural steel and iron (Q390GJC/Z35) for big thickness tall building, it is to be formed by the component melting of following weight percentage: C:0.16%~0.19%, Si≤0.55%, Mn:1.40%~1.55%, P≤0.012%, S≤0.003%, TAl (total aluminium): 0.020%~0.050%, Nb:0.020%~0.030%, V:0.035%~0.050%, Ni :≤0.30%, Cr :≤0.30%, Ti :≤0.05%, surplus is Fe and inevitable impurity.Wherein Ceq:0.40%~0.47%.
Steel plate of the present invention adopts chemical composition design, proposes high-intensity effect thereby carbon, manganese promote perlite to form, increase perlite relative content, and manganese has solution strengthening effect simultaneously; Add the carbonitride of a small amount of Nb to stop grain growth in heat-processed, basic preparation is provided for final steel lath grain is tiny, expand steel plate controlled rolling window, crystal grain thinning, improves obdurability; The carbonitride of V is process of cooling Precipitation after rolling, and improves intensity; By follow-up rational thermal treatment process, steel plate has good comprehensive mechanical property.
In steel plate, the effect in the present invention of each component and content is:
C:0.16%~0.19%, yield strength, tensile strength, the welding property of carbon on steel makes a significant impact, and carbon promotes perlite formation to significantly improve armor plate strength, but carbon content is too high, can affect again welding property and the toughness of steel.This content range has reduced the Peritectic Reaction of continuous casting and solidifying process simultaneously, has improved steel billet so that the surface quality of steel plate.
Si :≤0.55%, in steelmaking process, use as reductive agent and reductor, improve purity of steel, thereby improve internal quality of steel plate.
Mn:1.40%~1.55%, manganese alloy is with low cost, proposes high-intensity effect thereby promote perlite to form, increase perlite relative content, and manganese has solution strengthening effect and Grain refinement simultaneously, improving intensity can increase toughness, intensity and the hardness of steel, improves the hot workability of steel.Manganese amount is too high, is prone to center segregation.
P≤0.012%, S≤0.003%: in the ordinary course of things, p and s is all harmful element in steel, the fragility of increase steel; Phosphorus degenerates welding property, reduces plasticity, and cold-bending property is degenerated; Sulphur reduces ductility and the toughness of steel, causes crackle in the time of forging and rolling; Therefore should reduce the content of p and s in steel as far as possible.
Al:0.020%~0.050%, aluminium is the end-deoxidizer of steelmaking process, oxygen content in steel and inclusion can be dropped to very low level, improves purity, the density of continuously cast bloom, improves the internal soundness of steel plate; Simultaneously remaining a small amount of aluminium in steel, can crystal grain thinning, improves impelling strength.
Nb:0.020%~0.030%, the carbonitride of niobium can stop grain growth in heat-processed, thereby provides basic preparation for final steel lath grain is tiny; Niobium add the grain refining that can also promote steel rolling microstructure, can improve intensity and toughness simultaneously, niobium can be by suppressing austenite recrystallization in During Controlled Rolling, expand controlled rolling window, refinement microstructure effectively, and by precipitation strength matrix, in welding process, the alligatoring of austenite crystal when the segregation of niobium atom and separating out can hinder heating, and guarantee to obtain more tiny heat affected zone tissue after welding, welding property improved.But the carbonitride of niobium is separated out in continuous casting and solidifying process, improve the crack sensitivity of continuously cast bloom, increase the surface crack of continuously cast bloom, must coordinate the cooling intensity coupling of different cooling sections to be avoided by the secondary process for cooling of continuous casting production process.
V:0.035%~0.050%, the carbonitride of vanadium V is process of cooling Precipitation after rolling, and improves intensity; The carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.The carbonitride of vanadium is separated out in continuous casting and solidifying process, improve the crack sensitivity of continuously cast bloom, increase the surface crack of continuously cast bloom, must coordinate the cooling intensity coupling of different cooling sections to be avoided by the secondary process for cooling of continuous casting production process, the crack sensitivity of vanadium be slightly lower than niobium.
Ti: titanium is good reductor, adds Ti and can form with C, N element carbide, nitride or the carbonitride of Ti, the grain refining effect that these compounds have had in steel; Carbide, nitride or the carbonitride of Ti can stop grain growth in continuously cast bloom heat-processed; The all right fixed nitrogen of Ti, thus steel plate ageing resistance performance improved.For Q390GJC/Z35 of the present invention, needn't add intentionally Ti, the Ti in steel belongs to raw material and brings the residual content that last removal is not fallen into, is generally no more than 0.005%.
Ni: nickel is dissolved in austenite, suppresses austenite recrystallization, and refine austenite crystal grain improves steel plate low-temperature flexibility.For Q390GJC/Z35 of the present invention, needn't add intentionally Ni, the Ni in steel belongs to raw material and brings the residual content that can not remove into, is generally no more than 0.30%.
Cr: chromium improves steel plate hardening capacity, improves steel plate high-temperature behavior and temper resistance, for Q390GJC/Z35 of the present invention, needn't add intentionally Cr, and the Cr in steel belongs to raw material and brings the residual content that last removal is not fallen into, is generally no more than 0.005%.
Steel plate condition of delivery is normalizing, adopts 330mm × 2400mm specifications section continuously cast bloom to become a useful person, and finished product maximum ga(u)ge is 120mm, meets the requirement of II level in JB/T4730.3-2005 non-destructive testing standard.
The present invention has also adopted the production method of a kind of big thickness tall building structural steel and iron, comprises the steps:
(1) smelt: percentage composition is got each component and made molten steel by weight, first molten steel is sent into electrosmelting, when tapping, avoid seeing slag, then send into the refining of LF stove adjusting component, refining total time >=50min, white slag hold-time >=25min, guarantee that slag making is good, lime consumption >=15kg/t, process and [Al] >=0.015% of skimming, in the time that temperature meets or exceeds 1560 ± 10 ℃, molten steel is proceeded to vacuum degassing furnace (VD stove) vacuum-treat;
(2) continuous casting: by smelt after molten steel in the top casting of 330mm × 2400mm specifications section continuous caster, two cold total specific waters are 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, the additional draught of 0.7~0.8mm is implemented to continuously cast bloom in the position that at molten steel solidification end is solid rate 0.75~0.85, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 450A~480A, frequency 5HZ~6HZ, obtain continuously cast bloom,
(3) stacking: by the high-temperature continuous casting blank fast stacking rolling off the production line from casting machine, height of embankment 1.5~3m, stacking needs neat, and stacking time >=48h, then utilizes flame to carry out removing surface;
(4) heating: pack the strand after cleaning into continuous furnace, steel billet is in heating zone Heating temperature≤1260 ℃, wherein heat I section temperature and be not less than 1000 ℃, heating II section temperature is not less than 1200 ℃, 1200~1260 ℃ of soaking zone temperature do not allow certain section of burning to chew complete shut-down, total heat-up time >=10min/cm;
(5) rolling: adopt the controlled rolling of II type, the I stage is the austenite recrystallization stage, rolling temperature is 980~1180 ℃, single pass draft 6%~15%, rolled sheet material thickness is 180mm, and the II stage is the non-recrystallize stage of austenite, 850~900 ℃ of start rolling temperatures, 820~880 ℃ of finishing temperatures, accumulative total draft is no less than 33.33%;
(6) stacking slow cooling: by cooling the stacking that rolls off the production line in time of the steel plate after rolling, surface of steel plate temperature >=450 ℃, stacking total time >=72h;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 910 ± 10 ℃ of normalizing temperatures, soaking time >=2min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
Before vacuum-treat in described step (1), add CaSi piece 150kg/ stove, vacuum tightness≤66Pa, keeps vacuum time >=15min, soft blow 5min.
Superheating temperature in described step (2) is 25 ℃, and throwing speed is 1.15m/min.
Described in described step 5), the start rolling temperature of I stage rolling is 1090~1180 ℃, and finishing temperature is 930~980 ℃.
What in described step (5), the draft of the single pass in I stage was >=10% is no less than 3 passages.
The present invention has the following advantages:
Adopt steel plate more than continuously cast bloom (continuous casting process) Rolling Production maximum ga(u)ge 100mm, lumber recovery improves 13%, and corresponding production cost reduces by 13%.Internal soundness densification, can meet the requirement of JB/T2970-2004 II level non-destructive testing standard; Obdurability coupling is good, yield strength Re >=360MPa, tensile strength Rm:500~610MPa, 0 ℃ of impact of collision merit >=34J, A >=20%, yield tensile ratio≤0.85; Anti-lamellar tearing performance is good, Z-direction relative reduction in area >=35%; Steel of the present invention is pure, P≤0.012%, S≤0.003%; Steel plate maximum ga(u)ge can reach 120mm; The steel plate that adopts method of the present invention to produce has that purity is higher, composition evenly, the feature of interior solid, the metallurgical level of steel is higher, mechanical property meets standard-required completely, is suitable for manufacturing Highrise buildings structural part.
Embodiment
Embodiment 1
The big thickness tall building structural steel and iron of the present embodiment is to be formed by the component melting of following weight percent: C:0.17%, Si:0.33%, Mn:1.40%, P:0.008%, S:0.002%, V:0.035%, the total aluminium of TAl(): 0.050%, Nb:0.020%, all the other are Fe and inevitable impurity.The thickness of the present embodiment steel plate is 120mm.
The big thickness tall building of the present embodiment is as follows by the step of the production method of structural steel and iron:
(1) smelt: get each component by above-mentioned weight percentage and make molten steel, by molten steel first through electrosmelting, Metal Weight is 110 tons, send into the refining of LF stove adjusting component, refining total time is 50min, the white slag hold-time is 25min, lime consumption 15kg/t, in the time that liquid steel temperature meets or exceeds 1565 ℃, proceed to vacuum degassing furnace (VD stove) vacuum-treat, CaSi piece 150kg/ stove before vacuum-treat, vacuum tightness is not more than 66Pa, when vacuum hold-time 15min, destroy vacuum, soft blow 5min;
(2) continuous casting: adopt 330mm × 2400mm specifications section continuous caster to cast on the molten steel after smelting, employing continuous casting is produced, superheating temperature is 25 ℃, throwing speed is 1.15m/min, two cold total specific water 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, it is the position of solid rate 0.75~0.85 at molten steel solidification end, corresponding continuous caster the 10th, the 11st, the 12 3 section implemented 0.7mm to continuously cast bloom respectively, 0.7mm, the additional draught of 0.8mm, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 450A, frequency 5HZ, obtain continuously cast bloom,
(3) stacking: by high-temperature continuous casting blank fast stacking, height of embankment 2m, stacking time 48h, then utilizes flame to clear up, and cleans out the crackle that surface may exist, the defects such as subsurface bubble;
(4) heating: pack the strand after cleaning into stepped start-stop system continuous furnace, 1250 ℃ of maximum heating temperatures, wherein heat I section temperature and be not less than 1000 ℃, heating II section temperature is not less than 1200 ℃, 1240 ℃ of soaking zone temperature, be 10min/cm total heat-up time;
(5) rolling: the strand after heating is rolled, first stage is the austenite recrystallization stage, and start rolling temperature is 1180 ℃, 960 ℃ of finishing temperatures, being rolling to steel plate thickness is 180mm, single pass draft 6.5%~18%, wherein 4 more than 10% roads of single pass draft, subordinate phase is the non-recrystallize stage of austenite, 900 ℃ of start rolling temperatures, 860 ℃ of finishing temperatures, are rolling to target thickness, subordinate phase accumulative total draft 33.33%;
(6) stacking slow cooling: by cooling the work in-process steel plate stacking that rolls off the production line in time, 480 ℃ of surface of steel plate temperature, 72 hours stacking total times;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 900 ℃ of normalizing temperatures, soaking time 2min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
The present embodiment steel plate Ceq is 0.44%; Mechanical property is yield strength 395MPa, tensile strength 558MPa, and average 85 Jiao of 26%, 0 ℃ of ballistic work of unit elongation, Z-direction performance is average 42%, yield tensile ratio 0.72, yield of steel plate 88.90%, improves 13.40% than normal production method (employing steel ingot).
Embodiment 2
The big thickness tall building structural steel and iron of the present embodiment is to be formed by the component melting of following weight percent: C:0.16%, Si:0.15%, Mn:1.55%, P:0.010%, S:0.003%, V:0.040%, the total aluminium of TAl(): 0.035%, Nb:0.030%, all the other are Fe and inevitable impurity.The thickness of the present embodiment steel plate is 110mm.
The big thickness tall building of the present embodiment is as follows by the step of the production method of structural steel and iron:
(1) smelt: get each component by above-mentioned weight percentage and make molten steel, by molten steel first through electrosmelting, Metal Weight is 115 tons, send into the refining of LF stove adjusting component, refining total time is 68min, the white slag hold-time is 40min, lime consumption 15.8kg/t, in the time that liquid steel temperature meets or exceeds 1570 ℃, proceed to vacuum degassing furnace (VD stove) vacuum-treat, CaSi piece 150kg/ stove before vacuum-treat, vacuum tightness is not more than 66Pa, when vacuum hold-time 16min, destroy vacuum, soft blow 6min;
(2) continuous casting: adopt 330mm × 2400mm specifications section continuous caster to cast on the molten steel after smelting, employing continuous casting is produced, superheating temperature is 22 ℃, throwing speed is 1.15m/min, two cold total specific water 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, it is the position of solid rate 0.75~0.85 at molten steel solidification end, corresponding continuous caster the 10th, the 11st, the 12 3 section implemented 0.7mm to continuously cast bloom respectively, 0.7mm, the additional draught of 0.8mm, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 460A, frequency 5HZ, obtain continuously cast bloom,
(3) stacking: by high-temperature continuous casting blank fast stacking, height of embankment 2.5m, stacking time 48.5h, then utilizes flame to clear up, and cleans out the crackle that surface may exist, the defects such as subsurface bubble;
(4) heating: pack the strand after cleaning into stepped start-stop system continuous furnace, 1260 ℃ of maximum heating temperatures, wherein heat I section temperature and are not less than 1000 ℃, and heating II section temperature is not less than 1200 ℃, 1200 ℃ of soaking zone temperature, be 10.6min/cm total heat-up time;
(5) rolling: the strand after heating is rolled, first stage is the austenite recrystallization stage, and start rolling temperature is 1090 ℃, 930 ℃ of finishing temperatures, being rolling to steel plate thickness is 180mm, single pass draft 6%~19%, wherein 4 more than 10% roads of single pass draft, subordinate phase is the non-recrystallize stage of austenite, 890 ℃ of start rolling temperatures, 880 ℃ of finishing temperatures, are rolling to target thickness, subordinate phase accumulative total draft 33.33%;
(6) stacking slow cooling: by cooling the work in-process steel plate stacking that rolls off the production line in time, 530 ℃ of surface of steel plate temperature, 73 hours stacking total times;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 910 ℃ of normalizing temperatures, soaking time 2.5min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
The present embodiment steel plate Ceq is 0.43%; Mechanical property is yield strength 420MPa, tensile strength 568MPa, and average 120 Jiao of 25%, 0 ℃ of ballistic work of unit elongation, Z-direction performance is average 43%, yield tensile ratio 0.74, yield of steel plate 88.65%, improves 13.15% than normal production method (employing steel ingot).
Embodiment 3
The big thickness tall building structural steel and iron of the present embodiment is to be formed by the component melting of following weight percent: C:0.19%, Si:0.35%, Mn:1.49%, P:0.011%, S:0.001%, V:0.050%, the total aluminium of TAl(): 0.020%, Nb:0.025%, all the other are Fe and inevitable impurity.The thickness of the present embodiment steel plate is 120mm.
The big thickness tall building of the present embodiment is as follows by the step of the production method of structural steel and iron:
(1) smelt: get each component by above-mentioned weight percentage and make molten steel, by molten steel first through electrosmelting, Metal Weight is 109 tons, send into the refining of LF stove adjusting component, refining total time is 61min, the white slag hold-time is 38min, lime consumption 16.2kg/t, in the time that liquid steel temperature meets or exceeds 1550 ℃, proceed to vacuum degassing furnace (VD stove) vacuum-treat, CaSi piece 150kg/ stove before vacuum-treat, vacuum tightness is not more than 66Pa, when vacuum hold-time 15min, destroy vacuum, soft blow 5min;
(2) continuous casting: adopt 330mm × 2400mm specifications section continuous caster to cast on the molten steel after smelting, employing continuous casting is produced, superheating temperature is 20 ℃, throwing speed is 1.15m/min, two cold total specific water 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, it is the position of solid rate 0.75~0.85 at molten steel solidification end, corresponding continuous caster the 10th, the 11st, the 12 3 section implemented 0.7mm to continuously cast bloom respectively, 0.7mm, the additional draught of 0.8mm, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 460A, frequency 5HZ, obtain continuously cast bloom,
(3) stacking: by high-temperature continuous casting blank fast stacking, height of embankment 3m, stacking time 48h, then utilizes flame to clear up, and cleans out the crackle that surface may exist, the defects such as subsurface bubble;
(4) heating: pack the strand after cleaning into stepped start-stop system continuous furnace, 1260 ℃ of maximum heating temperatures, wherein heat I section temperature and are not less than 1050 ℃, and heating II section temperature is not less than 1240 ℃, 1260 ℃ of soaking zone temperature, be 11.2min/cm total heat-up time;
(5) rolling: the strand after heating is rolled, first stage is the austenite recrystallization stage, and start rolling temperature is 1120 ℃, 980 ℃ of finishing temperatures, being rolling to steel plate thickness is 180mm, single pass draft 6.8%~19%, wherein 4 more than 10% roads of single pass draft, subordinate phase is the non-recrystallize stage of austenite, 850 ℃ of start rolling temperatures, 820 ℃ of finishing temperatures, are rolling to target thickness, subordinate phase accumulative total draft 33.33%;
(6) stacking slow cooling: by cooling the work in-process steel plate stacking that rolls off the production line in time, 500 ℃ of surface of steel plate temperature, 80 hours stacking total times;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 920 ℃ of normalizing temperatures, soaking time 2min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
The present embodiment steel plate Ceq is 0.44%; Mechanical property is yield strength 415MPa, tensile strength 575MPa, and average 132 Jiao of 28%, 0 ℃ of ballistic work of unit elongation, Z-direction performance is average 45%, yield tensile ratio 0.72, yield of steel plate 88.84%, improves 13.34% than normal production method (employing steel ingot).

Claims (8)

1. a big thickness tall building structural steel and iron, is characterized in that, described steel plate is to be formed by the component melting of following weight percent: C:0.16%~0.19%, Si≤0.55%, Mn:1.40%~1.55%, P≤0.012%, S≤0.003%, TAl (total aluminium): 0.020%~0.050%, Nb:0.020%~0.030%, V:0.035%~0.050%, Ni :≤0.30%, Cr :≤0.30%, Ti :≤0.05%, surplus is Fe and inevitable impurity; Its preparation method comprises the following steps:
(1) smelt: percentage composition is got each component and made molten steel by weight, first molten steel is sent into electrosmelting, when tapping, avoid seeing slag, then send into the refining of LF stove adjusting component, refining total time >=50min, white slag hold-time >=25min, guarantee that slag making is good, lime consumption >=15kg/t, process and [Al] >=0.015% of skimming, in the time that temperature meets or exceeds 1560 ± 10 ℃, molten steel is proceeded to vacuum degassing furnace (VD stove) vacuum-treat;
(2) continuous casting: by smelt after molten steel in the top casting of 330mm × 2400mm specifications section continuous caster, two cold total specific waters are 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, the additional draught of 0.7~0.8mm is implemented to continuously cast bloom in the position that at molten steel solidification end is solid rate 0.75~0.85, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 450A~480A, frequency 5HZ~6HZ, obtain continuously cast bloom,
(3) stacking: by the high-temperature continuous casting blank fast stacking rolling off the production line from casting machine, height of embankment 1.5~3m, stacking needs neat, and stacking time >=48h, then utilizes flame to carry out removing surface;
(4) heating: pack the strand after cleaning into continuous furnace, steel billet is in heating zone Heating temperature≤1260 ℃, wherein heat I section temperature and be not less than 1000 ℃, heating II section temperature is not less than 1200 ℃, 1200~1260 ℃ of soaking zone temperature do not allow certain section of burning to chew complete shut-down, total heat-up time >=10min/cm;
(5) rolling: adopt the controlled rolling of II type, the I stage is the austenite recrystallization stage, rolling temperature is 930~1180 ℃, single pass draft 6%~19%, rolled sheet material thickness is 180mm, and the II stage is the non-recrystallize stage of austenite, 850~900 ℃ of start rolling temperatures, 820~880 ℃ of finishing temperatures, accumulative total draft is no less than 33.33%;
(6) stacking slow cooling: by cooling the stacking that rolls off the production line in time of the steel plate after rolling, surface of steel plate temperature >=450 ℃, stacking total time >=72h;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 910 ± 10 ℃ of normalizing temperatures, soaking time >=2min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
2. big thickness tall building structural steel and iron according to claim 1, it is characterized in that, described steel plate is to be formed by the component melting of following weight percent: C:0.16%~0.19%, Si:0.15~0.35%, Mn:1.40%~1.55%, P≤0.012%, S≤0.003%, TAl (total aluminium): 0.020%~0.050%, Nb:0.020%~0.030%, V:0.035%~0.050%, surplus is Fe and inevitable impurity.
3. big thickness tall building structural steel and iron according to claim 1, is characterized in that, the maximum ga(u)ge of this steel plate is 120mm.
4. a production method for structural steel and iron for big thickness tall building as claimed in claim 1, is characterized in that, comprises the following steps:
(1) smelt: percentage composition is got each component and made molten steel by weight, first molten steel is sent into electrosmelting, when tapping, avoid seeing slag, then send into the refining of LF stove adjusting component, refining total time >=50min, white slag hold-time >=25min, guarantee that slag making is good, lime consumption >=15kg/t, process and [Al] >=0.015% of skimming, in the time that temperature meets or exceeds 1560 ± 10 ℃, molten steel is proceeded to vacuum degassing furnace (VD stove) vacuum-treat;
(2) continuous casting: by smelt after molten steel in the top casting of 330mm × 2400mm specifications section continuous caster, two cold total specific waters are 0.35kg/t, adopt the mode of progressively successively decreasing from top to bottom, the water yield is distributed in the 1st fan-shaped section to the 16 fan-shaped section of Secondary Cooling Zone of Continuous Caster, adopt and gently depress, the additional draught of 0.7~0.8mm is implemented to continuously cast bloom in the position that at molten steel solidification end is solid rate 0.75~0.85, at continuous caster the 4th fan-shaped section import and a pair of agitating roller of the each installation of outlet, continuously cast bloom is carried out to roller type electromagnetic stirring, stir current 450A~480A, frequency 5HZ~6HZ, obtain continuously cast bloom,
(3) stacking: by the high-temperature continuous casting blank fast stacking rolling off the production line from casting machine, height of embankment 1.5~3m, stacking needs neat, and stacking time >=48h, then utilizes flame to carry out removing surface;
(4) heating: pack the strand after cleaning into continuous furnace, steel billet is in heating zone Heating temperature≤1260 ℃, wherein heat I section temperature and be not less than 1000 ℃, heating II section temperature is not less than 1200 ℃, 1200~1260 ℃ of soaking zone temperature do not allow certain section of burning to chew complete shut-down, total heat-up time >=10min/cm;
(5) rolling: adopt the controlled rolling of II type, the I stage is the austenite recrystallization stage, rolling temperature is 930~1180 ℃, single pass draft 6%~19%, rolled sheet material thickness is 180mm, and the II stage is the non-recrystallize stage of austenite, 850~900 ℃ of start rolling temperatures, 820~880 ℃ of finishing temperatures, accumulative total draft is no less than 33.33%;
(6) stacking slow cooling: by cooling the stacking that rolls off the production line in time of the steel plate after rolling, surface of steel plate temperature >=450 ℃, stacking total time >=72h;
(7) flaw detection: the steel plate after stacking is carried out to block-by-block flaw detection according to the requirement of II level in JB/T4730.3-2005 non-destructive testing standard;
(8) normalizing treatment: the qualified steel plate of detecting a flaw is carried out to normalizing, 910 ± 10 ℃ of normalizing temperatures, soaking time >=2min/mm, after normalizing water-cooled accelerate cooling, obtain big thickness tall building structural steel and iron.
5. the production method of structural steel and iron for big thickness tall building according to claim 4, is characterized in that, the start rolling temperature of I stage rolling is 1090~1180 ℃ described in step 5), and finishing temperature is 930~980 ℃.
6. the production method of structural steel and iron for big thickness tall building according to claim 4, is characterized in that, what in step (5), the draft of the single pass in I stage was >=10% is no less than 3 passages.
7. the production method of structural steel and iron for big thickness tall building according to claim 4, it is characterized in that, before the vacuum-treat in described step (1), add CaSi piece 150kg/ stove, vacuum tightness≤66Pa, keep vacuum time >=15min, soft blow 5min.
8. the production method of structural steel and iron for big thickness tall building according to claim 4, is characterized in that, the superheating temperature in described step (2) is 25 ℃, and throwing speed is 1.15m/min.
CN201210387699.2A 2012-10-12 2012-10-12 Large-thickness structural steel plate for high-rise building and production method thereof CN102912221B (en)

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