CN101705423A - Low-cost steel plate for building structure and manufacturing method thereof - Google Patents
Low-cost steel plate for building structure and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a low-cost steel plate for a building structure and a manufacturing method thereof. The steel plate comprises the following chemical components: C accounts for 0.14 percent to 0.17 percent, Si accounts for 0.20 percent to 0.50 percent, Mn accounts for 1.30 percent to 1.50 percent, P is equal to or less than 0.012 percent, S is equal to or less than 0.005 percent, Alt accounts for 0.020 percent to 0.060 percent, and the balances are Fe and unavoidable foreign impurities. (1) No noble metal elements such as Nb, V, Ti, Ni, Cr, Mo and the like, are added in the steel, the requirement of Q345GJ strength level is met completely though the chemical components C-Si-Mn-Al, and the cost is low; (2) the steel is purer, P is equal to or less than 0.012 percent, and S is equal to or less than 0.005 percent; (3) the impact toughness is good at the temperature of minus 40 DEG C, and the Charpy impact energy of a V-shaped notch is equal to or higher than 80 J; (4) the earthquake resistance is good, and the actual yield ratio is respectively smaller than 0.78; and (5) the lamellar tearing resistance is excellent, and the actual Z-direction section shrinkage ratio in the total-thickness direction is equal to or higher than 38 percent. The hot-rolling Q345GJEZ35 steel plate used for the building structure and provided with thickness of 20-90 mm can be produced, and the steel plate and the manufacturing method can be applied to the manufacture of the steel structure of the high-rise building, have good comprehensive performance and simple production process, can realize the batch production and have low cost.
Description
Technical field
The present invention relates to a kind of low-cost steel plate for building structure, be applied on the high-rise building steel structure, also relate to a kind of production method of low-cost steel plate for building structure simultaneously.
Background technology
At present, used building structural steel at home on the building field, but with the present invention with intensity rank or greater than steel all on the basic chemical ingredients of C-Si-Mn-Al, added elements such as Nb, V, Ti, Ni, Cr, Mo wherein one or more.
The patent No. is that 200810104298.5 Chinese invention patent has openly illustrated a kind of steel plate for tall building, its these steel are characterised in that: chemical ingredients is C:0.12～0.17% by weight percentage, Si:0.30～0.45%, Mn:1.35～1.55%, P :≤0.022%, S :≤0.010%, Alt:0.020～0.050%, V:0.03～0.10%.These steel have added the V alloy element, the cost height; S, P content height, the steel plate maximum ga(u)ge is 60mm only.
The patent No. is that 01133562.9 Chinese invention patent has openly illustrated a kind of high-performance refractory weather-resisting building steel and production method thereof, and this steel contains multiple alloying elements such as Mo, Ni, Cr, Cu, Ti, Nb, V, cost of alloy height; This steel rolls the back and adopts normalizing+tempering process, production technique cost height.
The patent No. is that 200710054569.6 Chinese invention patents openly illustrate a kind of big thickness tall building structure high-strength steel and production technique thereof, this steel chemical composition is: C:0.15～0.18%, Si:0.20～0.40%, Mn:1.50～1.62%, P≤0.015%, S≤0.005%, Ni:0.25～0.45%, V:0.075～0.085%, Nb:0.040～0.050, Alt:0.020～0.045%, Cr :≤0.30%, Ti≤0.20%.This steel has added Nb, V, Ti, Ni, Cr alloying element, and electrosmelting-die casting cast slab technology is adopted in steel-making, and steel plate rolls the back and adopts normalizing process.Its chemical ingredients and production technique are different fully with the present invention.
The patent No. is building structural steel and the production technique thereof that 94111944.0 Chinese invention patents openly illustrate a kind of high anti-seismic performance, this steel belongs to hot rolled ribbed steel bar series, and its chemical ingredients is: C:0.14-0.20%, Si:0.30-0.70%, Mn:1.10-1.40%, V:0.04-0.08%, Ti:0.01-0.03%, P≤0.035%, S≤0.035%.Different with the present invention, this steel has added V, Ti alloying element, and C content height is up to 0.20%.
Summary of the invention
The steel plate for building structure that the purpose of this invention is to provide a kind of low-cost and high-performance is applied on the high-rise building steel structure, and a kind of production method of low-cost and high-performance steel plate for building structure also is provided simultaneously.Steel of the present invention adopts the C-Si-Mn-Al chemical ingredients, do not add any precious metal elements such as Nb, V, Ti, Ni, Cr, Mo, by Clean Steel technology, controlled rolling and controlled chilling, can mass-produce have good obdurability, thick 20～90mm hot rolling attitude steel plate for building structure of low yield strength ratio, narrow yield-point, anti-lamellar tearing ability, and production cost is low.
Purpose of the present invention can realize by following measure:
The present invention relates to a kind of low-cost steel plate for building structure, it is characterized in that: the chemical ingredients of this steel plate is by weight percentage, C 0.14～0.17%, Si 0.20～0.50%, Mn1.30～1.50%, P≤0.012%, S≤0.005%, Alt 0.020～0.060%, and surplus is Fe and inevitably presss from both sides matter.
Simultaneously, technical program of the present invention also lies in a kind of production method of low-cost steel plate for building structure, may further comprise the steps:
(1) hot metal pretreatment: molten iron S before the desulfurization≤0.040%, Si≤0.50%, sulphur S≤0.005% after the desulfurization.
(2) smelting technology: molten steel adds Al iron 280～300kg/ stove and carries out deoxidation earlier through converter smelting during tapping, the size of stove is 100 tons, carry out deoxidation and SiMn alloying, send the LF stove to carry out desulfurization, deoxygenation refining processing then, carry out the RH vacuum-treat again, vacuum time 10～15 minutes; Feed 290～320 meters SiCa lines after the vacuum, and carried out soft blow 10～13 minutes.
(3) continuous casting process: the bag temperature is 1546～1554 ℃ in protecting in the casting process, protects superheating temperature≤20 ℃, the thick 220mm of continuous casting～320mm slab.
(4) heating process: 220mm～320mm heavy slab is heated 1180～1230 ℃ of Heating temperatures, 1150～1210 ℃ of soaking temperatures at process furnace.
(5) rolling technology: adopt two stage rolling technologies, in the austenite recrystallization stage, single pass deformation rate 6-26%, in the noncrystalline stage of austenite, control thickness≤40mm according to the difference of thickness specification, subordinate phase start rolling temperature≤930 ℃, finishing temperature≤820 ℃; Thickness＞40mm, subordinate phase start rolling temperature≤920 ℃, finishing temperature≤810 ℃.
(6) water-cooling process: thickness≤40mm steel plate adopts air cooling, and thickness＞40mm steel plate cools off fast through ACC, and the final cooling temperature span of control is 660～680 ℃, steel plate air cooling or stacking slow cooling 48 hours after heat is rectified.
Technology of the present invention has following advantage:
(1) the C-Si-Mn-Al chemical ingredients is adopted in thick 10-90mm steel plate design of the present invention, does not add any precious metal elements such as any Nb, V, Ti, Ni, Cr, Mo, and cost is low, and cost of alloy can be saved more than 100 yuan/ton than domestic prior art.
(2) steel plate design of the present invention adopts C-Si-Mn-Al chemical ingredients carbon equivalent low, the carbon equivalent Ceq of thick 20-90mm steel plate≤0.41, and the national Specification requirement far below Ceq≤0.44 has good welding property.
(3) the present invention adopts the Clean Steel smelting technology, and steel is purer, and the strand inner quality is good; By adopting desulfurizing iron → converter smelting → LF stove refining → RH vacuum-treat → continuous casting process, make P≤0.012%, S≤0.005%, [H]≤1.5ppm.
(4) the present invention passes through control Heating temperature, controlled rolling and controlled chilling, thereby the over-all properties that guarantees steel plate is good.Thick 20-90mm steel plate obdurability of the present invention is good, and intensity is moderate, and the yield strength fluctuation range is lower than 120Mpa standard gauge definite value in 110Mpa;-40 ℃ of impelling strength are good, v-notch Charpy-V impact power 〉=80J; Yield tensile ratio has good seismic resistance all less than 0.78; Anti-lamellar tearing is functional, and full thickness direction Z is to relative reduction in area 〉=38%.
(5) steel plate of hot rolling attitude delivery of the present invention can satisfy the requirement of high-strong toughness, low yield strength ratio, narrow yield-point, anti-lamellar tearing and good welds performance building structural steel fully, need not to heat-treat, and simplifies production technique, enhances productivity.
Concrete embodiment
(1) hot metal pretreatment: sulphur content affects the performance of steel plate, for guaranteeing steel-making final sulphur content S≤0.005%, molten iron is carried out pre-treatment, makes sulphur S≤0.005% after the desulfurization.
(2) smelting technology: molten steel is earlier through converter smelting, add Al iron 280～300kg/ stove during tapping, the size of stove is 100 tons, carry out deoxidation and SiMn alloying, send the LF stove to carry out desulfurization, deoxygenation refining processing then, carry out the RH vacuum-treat again, vacuum time 10～15 minutes makes H gas content≤1.5ppm; Feed 290～320 meters SiCa lines after the vacuum and carry out inclusion modification and handle, make that MnS and oxide inclusion sex change are near-spherical in the steel, reduce the anisotropy of steel; Bull ladle after 10～13 minutes soft blow time stirs by blowing Ar, can make to be mingled with mutually fully come-up; Above-mentioned measure has guaranteed that steel has cleanliness factor preferably.
(3) continuous casting process: casting process carries out the full guard casting, opens behind the casting process protective casing and waters, and prevents from the secondary oxidation of molten steel and prevent to inhale nitrogen, oxygen uptake and inclusion to entrain into; Bag temperature 1546～1554 in protecting in the casting process is protected superheating temperature≤20 ℃, crystallization control device liquid level stabilizing; The continuous casting steel billet gauge is 220mm, 250mm, three specifications of 320mm.
(4) heating process: the present invention is with traditional different, and the building result of domestic this strength grade generally adopts with steel and adds Nb, V, Ti microalloy element, and the carboritride of Nb, V, Ti can stop the alligatoring of austenite crystal in the heat-processed.The present invention does not add elements such as Nb, V, Ti, and for preventing AUSTENITE GRAIN COARSENING, Heating temperature is controlled in the present invention's strictness, and the heating zone heating and temperature control is in 1180～1230 ℃ of scopes, and the soaking zone heating and temperature control is in 1150～1210 ℃ of scopes.
(5) rolling technology: for improving the strand latent defect, improve the homogeneity of plate property,, use 220mm, 250mm, 320mm strand, to guarantee overall compression ratio 〉=3.5 according to steel plate thickness specification difference.
Rolling technology adopts two stage rolling technologies, in the austenite recrystallization fs, and 980～1130 ℃ of start rolling temperatures, single pass deformation rate 6～26%.The high-temperature stage is adopted enough heavy reduction rates in the austenite recrystallization district, impels austenite generation recrystallize, improves grain refining effect.
In the noncrystalline stage of austenite, control according to the difference of thickness specification; Thickness≤40mm, subordinate phase start rolling temperature≤930 ℃, finishing temperature≤820 ℃; Thickness＞40mm, subordinate phase start rolling temperature≤920 ℃, finishing temperature≤810 ℃, accumulative total deformation rate 〉=40%.In this stage, austenite crystal elongates, flattens because of distortion, and forms deformation bands in crystal grain, ferrite crystal grain refinement after the promotion phase transformation.
(6) water-cooling process: thickness≤40mm steel plate adopts air cooling, and thickness＞40mm steel plate cools off fast through ACC, and the final cooling temperature span of control is 660～680 ℃.Steel plate is air cooling or stacking slow cooling after heat is rectified; Steel plate thickness＜30mm adopts air cooling, and steel plate thickness 〉=30mm adopts 48 hours stacking slow cooling, with abundant effusion hydrogen, reduces internal stress, avoids the generation of steel plate crackle.
Embodiment 1
Steel plate actual constituent of the present invention (by weight percentage): C 0.15%, and Si 0.38%, Mn 1.36%, P 0.010%, and S 0.003%, and Alt 0.036%, and carbon equivalent Ceq is 0.38%, and surplus is Fe and inevitably presss from both sides matter.Roll into thick 80mm steel plate, its plate property: yield strength 370Mpa, tensile strength 525Mpa, yield tensile ratio 0.70, unit elongation 30.5% ,-40 ℃ of impact of collision merits (AKV) 119J, 94J, 132J, Z is to relative reduction in area 55.0%, 52.0%, 59.5%.
Production method of the present invention is as follows:
(1) hot metal pretreatment: molten iron S 0.035% before the desulfurization, Si≤0.42%, desulfurized molten iron S are 0.004%.
(2) smelting technology: molten iron is carried out converter smelting, add Al iron 300kg/ stove during tapping, send the LF refining furnace to carry out desulfurization, deoxidation treatment then, carry out the RH vacuum-treat again, vacuum time 12 minutes, H gas content 1.33ppm; Feed 300 meters SiCa lines after the vacuum and carry out inclusion modification processing, bull ladle after 12 minutes soft blow time.
(3) continuous casting process: the bag temperature is 1548～1553 ℃ in the casting process, superheating temperature≤18 ℃, the thick 320mm slab of continuous casting.
(4) heating process: send thick 320mm slab to the process furnace heating, the heating zone heating and temperature control is at 1189～1230 ℃, and the soaking zone heating and temperature control is in 1150～1210 ℃ of scopes.
(5) rolling technology: adopt two stage rolling technologies, in the austenite recrystallization fs, 1030 ℃ of start rolling temperatures, this stage single pass deformation rate 6.7-23.6%, in the noncrystalline stage of subordinate phase austenite, 900 ℃ of start rolling temperatures, 805 ℃ of finishing temperatures, accumulative total deformation rate 50%.
(6) water-cooling process: thickness 80mm steel plate cools off fast through ACC, and the final cooling temperature span of control is 670 ℃, and steel plate carries out 48 hours stacking slow cooling after heat is rectified.
Embodiment 2
The actual constituent of steel plate of the present invention (by weight percentage): C 0.17%, Si0.36%, and Mn 1.40%, P 0.009%, S 0.002%, and Alt 0.042%, and carbon equivalent Ceq is 0.41%, and surplus is Fe and inevitably presss from both sides matter.Roll into thick 36mm steel plate, its plate property: yield strength 415Mpa, tensile strength 545Mpa, yield tensile ratio 0.76, unit elongation 29.0% ,-40 ℃ of impact of collision merits (AKV) are 125J, 104J, 144J, Z is 61.0%, 57.0%, 60.5% to relative reduction in area.
Production method of the present invention is as follows:
(1) hot metal pretreatment: molten iron S 0.035% before the desulfurization, Si≤0.44%, desulfurized molten iron S are 0.0046%.
(2) smelting technology: molten iron is carried out converter smelting, add Al iron 290kg/ stove during tapping, send the LF refining furnace to carry out desulfurization, deoxidation treatment then, carry out the RH vacuum-treat again, vacuum time 14 minutes, H gas content 1.41ppm; Feed 300 meters SiCa lines after the vacuum and carry out inclusion modification processing, bull ladle after 11 minutes soft blow time.
(3) continuous casting process: the bag temperature is 1547～1554 ℃ in the casting process, superheating temperature≤19 ℃, the thick 220mm slab of continuous casting.
(4) heating process: send thick 220mm slab to the process furnace heating, the heating zone heating and temperature control is at 1185～1230 ℃, and the soaking zone heating and temperature control is in 1160～1210 ℃ of scopes.
(5) rolling technology: adopt two stage rolling technologies, in the austenite recrystallization fs, 1055 ℃ of start rolling temperatures, this stage single pass deformation rate 7.9-25.2%; In the noncrystalline stage of subordinate phase austenite, 916 ℃ of start rolling temperatures, 815 ℃ of finishing temperatures, accumulative total deformation rate 62%.
(6) water-cooling process: thickness 36mm steel plate adopts air cooling, and steel plate carries out 48 hours stacking slow cooling after heat is rectified.
Produce proof: steel plate steel of the present invention is pure, P≤0.012%, S≤0.005%;-40 ℃ of ballistic work 〉=80J, actual yield tensile ratio is all less than 0.78, and full thickness direction Z is to relative reduction in area 〉=38%, and steel plate has good low-temperature flexibility, anti-seismic performance and anti-lamellar tearing performance.
Claims (2)
1. low-cost steel plate for building structure, it is characterized in that: the chemical ingredients of this steel plate is by weight percentage, C 0.14～0.17%, Si 0.20～0.50%, Mn 1.30～1.50%, P≤0.012%, S≤0.005%, Alt 0.020～0.060%, and surplus is Fe and inevitably presss from both sides matter.
2. as the production method of the described a kind of low-cost steel plate for building structure of production claim 1, it is characterized in that: may further comprise the steps:
(1) hot metal pretreatment: molten iron S before the desulfurization≤0.040%, Si≤0.50%, sulphur S≤0.005% after the desulfurization.
(2) smelting technology: molten steel adds Al iron 280～300kg/ stove and carries out deoxidation earlier through converter smelting during tapping, the size of stove is 100 tons, carry out deoxidation and SiMn alloying, send the LF stove to carry out desulfurization, deoxygenation refining processing then, carry out the RH vacuum-treat again, vacuum time 10～15 minutes; Feed 290～320 meters SiCa lines after the vacuum, and carried out soft blow 10～13 minutes.
(3) continuous casting process: the bag temperature is 1546～1554 ℃ in protecting in the casting process, protects superheating temperature≤20 ℃, the thick 220mm of continuous casting～320mm slab.
(4) heating process: 220mm～320mm heavy slab is heated 1180～1230 ℃ of Heating temperatures, 1150～1210 ℃ of soaking temperatures at process furnace.
(5) rolling technology: adopt two stage rolling technologies, in the austenite recrystallization stage, single pass deformation rate 6-26%, in the noncrystalline stage of austenite, control thickness≤40mm according to the difference of thickness specification, subordinate phase start rolling temperature≤930 ℃, finishing temperature≤820 ℃; Thickness＞40mm, subordinate phase start rolling temperature≤920 ℃, finishing temperature≤810 ℃.
(6) water-cooling process: thickness≤40mm steel plate adopts air cooling, and thickness＞40mm steel plate cools off fast through ACC, and the final cooling temperature span of control is 660～680 ℃, steel plate air cooling or stacking slow cooling 48 hours after heat is rectified.
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