CN106555118A - A kind of microalloy high-strength high-ductility steel containing Cu and its production method - Google Patents

A kind of microalloy high-strength high-ductility steel containing Cu and its production method Download PDF

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CN106555118A
CN106555118A CN201611103602.5A CN201611103602A CN106555118A CN 106555118 A CN106555118 A CN 106555118A CN 201611103602 A CN201611103602 A CN 201611103602A CN 106555118 A CN106555118 A CN 106555118A
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steel
microalloy
ductility steel
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strength high
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CN106555118B (en
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高宇波
朱富强
万文华
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Changzhou Bangyi Iron and Steel Co., Ltd.
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Zenith Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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Abstract

The invention belongs to micro alloyed steel preparation field, more particularly to a kind of microalloy high-strength high-ductility steel containing Cu and its production method.Microalloy high-strength high-ductility steel each component C：0.10～0.18%, Si：0.25～0.50%, Mn：1.00～1.70%, P≤0.020%, S≤0.015%, Cr≤0.30%, Cu≤0.50%, Ni≤0.50%, V≤0.20%, Ti：0.02～0.20%, Al >=0.015%, balance of Fe, realizes without Nbization composition design, and effectively reduces Ni contents in steel, makes full use of the obdurability of microalloy to act on, makes the comprehensive mechanical property of steel be significantly improved.

Description

A kind of microalloy high-strength high-ductility steel containing Cu and its production method
Technical field
The invention belongs to micro alloyed steel preparation field, more particularly to a kind of microalloy high-strength high-ductility steel containing Cu and its Production method.
Background technology
Micro-alloy high-strength steel is as its mouldability is strong, good welding performance the features such as, generally as structural applications The requirement of important materials, particularly yield strength is particularly extensive in the application of the micro-alloy high-strength steel of more than 500Mpa, same with this When, in recent years with the fast development of the industries such as transportation, building, engineering machinery, to the tough of micro-alloy high-strength steel used Property and plasticity it is also proposed higher and higher requirement.
In order to improve the comprehensive mechanical property of micro alloyed steel, it is current extremely widespread method to add Nb in steel.However, Nb's also increases production cost while being added in effective improving performance, and surface quality of steel control difficulty increases Plus, more importantly, easily there is harmful Widmannstatten structure in subsequent heat treatment in the Hi-Stren steel material containing Nb, low The warm impact property big stability that fluctuates is poor.
The content of the invention
The invention provides a kind of microalloy high-strength high-ductility steel containing Cu, each component content is in percentage by weight For：C：0.10～0.18%, Si：0.25～0.50%, Mn：1.00～1.70%, P≤0.020%, S≤0.015%, Cr≤ 0.30%, Cu≤0.50%, Ni≤0.50%, V≤0.20%, Ti：0.02～0.20%, Al >=0.015%, balance of Fe,
Wherein, C forms the alloy carbide of pearlite or disperse educt in steel, makes steel be strengthened；But C was controlled Height will substantially reduce the toughness and welding performance of steel, used as preferred：In finished product, C content span of control is 0.12～0.15%；
Si energy significantly reinforced ferrite, with stronger solid solution strengthening effect, Si can increase the ferrite in steel again Fraction, is conducive to improving plasticity, if but Si is too high, the toughness and other processing performances of steel will be reduced, as preferred：Si is controlled Between 0.32～0.42%；
Mn is to improve intensity, improve the important alloying element of toughness, and Mn contents increase, and on the one hand reduce the eutectoid composition of steel C content, causes either pearlite occurred to increase, and improves the intensity of steel, on the other hand reduces the phase transition temperature of steel, slow down austenite to pearly-lustre The rate of transformation of body, improves quenching degree, and fining ferrite grains, pearlite colony and pearlite interlamellar spacing improve the same of hardness of steel When improve modeling, the toughness of steel；For this steel grade, suitable control Mn content so that Mn/C 10 or so, guarantee hardness of steel, The plasticity and toughness of steel can be effectively improved while welding performance；
Cr can significantly improve intensity, hardness and wearability, but unhelpful for the improvement of plasticity and toughness, and this steel grade is preferred 0.15～0.25%Cr is added, on the basis of steel plasticity and toughness is not affected, strengthens the supply in terms of intensity；
V is one of main microalloy element, belongs to strong carbonitride-forming elements, and its carbonitride is to realize precipitation strength Important foundation；In steel, the strong carbide element such as V secures a part of C in steel, have impact on P/F in steel (F represents ferrite, Relative quantity similarly hereinafter), and change distribution and the form of F；The V being solid-solution in austenite, improves the stability of overcooling austenite, Transition temperature is reduced, pearlitic structrure has been refined, significantly affects the intensity and plasticity and toughness of steel, as preferred：The addition control of V Make 0.08～0.12%；
The addition of Ti can effective crystal grain thinning, tough having concurrently the property to improve steel provides advantage, and different from V, Which raises precipitation strength increment with temperature substantially increases, and Ti is added as complex element, so may insure that performance is controllable；No Cross, Ti too high levels, will not only reduce the reinforcing effect of V, and the toughness of steel can be damaged, as preferred：Ti contents exist When 0.02～0.04% or so, the best results of inhibiting grain growth；
Cu not only can improve the decay resistance of steel in appropriate addition, strengthen which suitable under the conditions of Different climate The property used；And Cu be independent of carbon, nitrogen effect significant precipitation strength effect can be produced in steel, due to its solution strengthening Effect than relatively similar, can also substitute part Ni, further reduce production cost with nickel；And copper is separated out and is turned prior to austenite Become, with fining austenite grains and can contribute to obtaining more acicular ferrites and favourable to improving the toughness of steel.Therefore, low-carbon (LC) Steel adds amount of copper, contributes to obtaining higher-strength and toughness, and it is comprehensive to improve raising welding performance and corrosive nature etc. Energy；But copper content should not be too high, and otherwise the adverse effect of copper brittleness can be obvious, used as preferred：This steel grade addition is 0.18～0.28%；
Ni is the main alloy element to form austenite, and the addition of Ni is the important of raising toughness, particularly low-temperature flexibility Ensure, the presence of Ni also suppress during amount of copper copper brittleness to lay a good foundation to add, but Ni elements are precious metals, used as excellent Choosing：Its target content is controlled relatively low 0.10～0.15%；
P, S be then strict controlled in≤0.010% in the range of, to reduce which for obdurability, particularly low-temperature flexibility Affect, low-temperature flexibility is also reduced to a certain extent for the dependence of Ni contents；
Additionally, Al is controlled 0.020～0.035% in steel, it is ensured that while deoxidation effect, further crystal grain thinning, and The precipitating reinforcing effect of V, Ti is not weakened.
Present invention also offers a kind of production method of the above-mentioned microalloy high-strength high-ductility steel containing Cu：EAF- CONVERTER electricity converter smelting+LF+VD+CCM+ controlled rolling and controlled coolings, concrete operations are：
EAF-CONVERTER electricity converter tappings, using eccentric bottom tapping and stay steel to operate, and forbid slag of tapping, furnace rear to match somebody with somebody Plus low-carbon ferromanganese, ferrosilicon, low-carbon ferrochromium, vanadium iron adjustment Mn, Si, Cr, V content；
Then molten steel goes to LF stove refines, and refine early stage carries out complex deoxidization using aluminum shot and carborundum, and slag to be refined becomes Bai Yihou adds copper to adjust molten steel Cu, Ni content with nickel plate, continues smelting and added to 10 minutes before LF bull ladles ferrotianium adjustment Ti to contain Amount, refining cycle were controlled in 40-70 minutes；
Subsequently, molten steel is transported to VD stove applications of vacuum, the pressurize more than 10 minutes under condition of high vacuum degree 67Pa, feeds after vacuum breaker Enter appropriate calcium line carries out degenerative treatments, soft blow more than 20 minutes to field trash；
Turn continuous casting again to be cast, cast using whole process protection in continuous casting casting cycle, the degree of superheat is controlled at 15～25 DEG C, Inner Quality of Billet, two cold employing weak cold patterns are improved using electromagnetic agitation；
Gained strand controls 1030 ± 30 DEG C of roughing temperature in the operation of rolling, and 825 ± 25 DEG C of final rolling temperature wears water after rolling 630 ± 25 DEG C are quickly cooled to, cooldown rate 15-20 DEG C/min, cold bed on subsequent stocking enter to cheat slow cooling after completing collecting and baling 36 hours, 150 DEG C of temperature ＜ went out hole；
Temper after normalizing is carried out to rolling gained stocking：Stocking is heated to 935 ± 10 DEG C, is incubated 30 minutes, air-cooled To room temperature (25 DEG C, similarly hereinafter)；420～500 DEG C are heated to, after insulation 50-60 minutes, room temperature is cooled to.
The beneficial effects of the present invention is：The present invention by adding the effective element such as Cu, Cr, given full play to Mn in steel, The compound obdurabilityization effect of Ni, V, Ti, Cu, Cr, the grain refining effect of Al, Ti, strict control P content and Mn/C, Cu/Ni Ratio, and optimization subsequent heat treatment technique method, ensure high performance requirements on the premise of, realize without Nb chemical conversion point Design, it is to avoid be harmful to microstructure surface quality caused by addition Nb and the drawback such as welding performance deteriorates；Meanwhile, significantly drop The low content requirement of the high-performance micro alloyed steel to Ni, greatlys save production cost；Stocking stable performance reaches lower surrender Intensity ReL >=500MPa, tensile strength Rm >=650MPa, elongation after fracture Z >=30%, -40 DEG C of Impact energy Ak v2The height of >=55J Strength high toughness is required.
Specific embodiment
Embodiment 1：
Using the process route of EAF-CONVERTER electricity converter smelting → LF stoves refine → VD applications of vacuum → CCM continuous castings Microalloy high-strength high-ductility steel of the production containing Cu,
Smelt the control of finished product composition：C：0.13%, Si：0.36%, Mn：1.50%, P：≤ 0.010%, S：≤ 0.010%, Cr：0.19%, Cu：0.25%, Ni：0.12%, V：0.09%, Ti：0.03%, Al：0.028%, balance of Fe,
Electric converter using molten iron, the pig iron and high-quality steel scrap as raw material, the control of total charge weight at 100.5 tons, hot metal ratio 93%, pig iron addition is 2.5 tons, and remaining is high-quality steel scrap, and tap terminal composition C：0.05%th, P：0.004%th, tapping temperature T：1634 DEG C, 85.9 tons of tap using eccentric bottom tapping and stays steel to operate, and forbids slag of tapping；Tapping process adds appropriate Al blocks and carbide carry out deoxidation, and furnace rear carries out the alloying of Mn, Si, Cr with addition of low-carbon ferromanganese, ferrosilicon, low-carbon ferrochromium；
LF refining early stage adopts aluminum shot and carborundum to strengthen deoxidation, and electrified regulation realized white slag after 8 minutes；Take LF mono- Sample is added a small amount of silicomanganese, low-carbon ferrochromium after determining composition and Mn, Cr content is adjusted to desired value, it is contemplated that follow-up ferrosilicon powder increases silicon And vacuum returns silicon, Si contents are adjusted to target zone lower limit, are subsequently added the alloy that vanadium iron, copper and nickel plate complete V, Cu, Ni Change and require；In refine mid-early stage by feeding aluminum steel, it is ensured that the suitable aluminium content of molten steel further to molten steel deep deoxidation, refine Middle and late stage small lot repeatedly uniformly flies away ferrosilicon powder to top of the slag deoxidation guarantor's slag；Before LF bull ladles, 10 minutes feeding ferrotianium adjustment Ti contain Measure, immediately VD stoves on bull ladle, 1628 DEG C of bull ladle temperature, LF refining duration 52 minutes；
Molten steel is transported to VD stove applications of vacuum, and under condition of high vacuum degree 67Pa, pressurize more than 10 minutes, feeds 60 after vacuum breaker The pure calcium line of rice carries out degenerative treatments, soft blow 32 minutes to field trash, then turns continuous casting and cast；
23 DEG C of the continuous casting degree of superheat, a cold water flow 102m3/ h, 32 DEG C of inflow temperature, 8.2 DEG C of a cold water temperature difference, two cold ratios Water yield 0.22L/kg, pulling rate are 0.95m/min, using peritectic steel mould flux, open M-EMS and using complete Flow process molding casting, strand enter 972 DEG C of withdrawal straightening machine temperature；
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 95mm, during rolling, 1055 DEG C of roughing temperature, and finish rolling 845 DEG C of temperature, rolls rear Water cooling, and 18 DEG C/min of cooldown rate walks the offline rear stocking of cold bed and enters to cheat slow cooling 36 hours, temperature ＜ 150 DEG C go out hole；
After gained stocking is processed into detection sample, it is heated to 935 DEG C and is incubated 30 minutes, it is air-cooled to room temperature；It is heated to 500 DEG C, 50 minutes are incubated, room temperature is air cooled to.
Service check reaches lower yield strength ReL：545MPa, tensile strength Rm：694MPa, elongation after fracture Z： 33.5%, -40 DEG C of Impact energy Ak v2：69J.
Embodiment 2：
Using the process route of EAF-CONVERTER electricity converter smelting → LF stoves refine → VD applications of vacuum → CCM continuous castings Microalloy high-strength high-ductility steel of the production containing Cu,
Smelt the control of finished product composition：C：0.14%, Si：0.40%, Mn：1.36%, P：≤ 0.010%, S：≤ 0.010%, Cr：0.23%, Cu：0.26%, Ni：0.12%, V：0.12%, Ti：0.025%, Al：0.032%, it is balance of Fe,
Electric converter using molten iron, the pig iron and high-quality steel scrap as raw material, the control of total charge weight at 102.12 tons, hot metal ratio 91%, pig iron addition is 4.3 tons, and remaining is high-quality steel scrap, and tap terminal composition C：0.04%th, P：0.005%th, tapping temperature T：1638 DEG C, 87.2 tons of tap using eccentric bottom tapping and stays steel to operate, and forbids slag of tapping；Tapping process adds appropriate Al blocks and carbide carry out deoxidation, and furnace rear carries out the alloying of Mn, Si, Cr with addition of low-carbon ferromanganese, ferrosilicon, low-carbon ferrochromium；
LF refining early stage adopts aluminum shot and carborundum to strengthen deoxidation, and electrified regulation realized white slag after 10 minutes；Take LF A small amount of silicomanganese, low-carbon ferrochromium are added after equally determining composition Mn, Cr content to be adjusted to desired value, it is contemplated that follow-up carborundum increases Silicon and vacuum return silicon, and Si contents are adjusted to target zone lower limit, are subsequently added the conjunction that vanadium iron, copper and nickel plate complete V, Cu, Ni Aurification is required；It is in refine mid-early stage by feeding aluminum steel, it is ensured that the suitable aluminium content of molten steel further to molten steel deep deoxidation, smart Refining middle and late stage small lot repeatedly uniformly flies away carborundum to top of the slag deoxidation guarantor's slag；Before LF bull ladles, 12 minutes feeding ferrotianium adjustment Ti contain Measure, immediately VD stoves on bull ladle, 1632 DEG C of bull ladle temperature, LF refining duration 62 minutes；
Molten steel is transported to VD stove applications of vacuum, and under condition of high vacuum degree 67Pa, pressurize more than 10 minutes, feeds 80 after vacuum breaker The pure calcium line of rice carries out degenerative treatments to field trash.Soft blow 35 minutes, then turn continuous casting and cast；
21 DEG C of the continuous casting degree of superheat, a cold water flow 100m3/ h, 35 DEG C of inflow temperature, 7.9 DEG C of a cold water temperature difference, two cold ratios Water yield 0.20L/kg, pulling rate are 0.90m/min, using peritectic steel mould flux, open M-EMS and using complete Flow process molding casting, strand enter 965 DEG C of withdrawal straightening machine temperature；
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 80mm, during rolling, 1032 DEG C of roughing temperature, and finish rolling 835 DEG C of temperature, rolls rear Water cooling, and 20 DEG C/min of cooldown rate walks the offline rear stocking of cold bed and enters to cheat slow cooling 36 hours, temperature ＜ 150 DEG C go out hole；
After gained stocking is processed into detection sample, it is heated to 935 DEG C and is incubated 30 minutes, it is air-cooled to room temperature；It is heated to 420 DEG C, 60 minutes are incubated, room temperature is air cooled to.
Service check reaches lower yield strength ReL：536MPa, tensile strength Rm：682MPa, elongation after fracture Z：36% ,- 40 DEG C of Impact energy Ak v2：83J.
On the basis of embodiment 2, change stocking and be processed to the heat treatment operation after detecting sample, remaining component, work Skill is constant, and concrete heat treatment operation and result are as shown in table 1：
Table 1
Comparative example 5
In whole production process, any copper material is added without, remaining operation is with embodiment 1：
Service check reaches lower yield strength ReL：426MPa, tensile strength Rm：518MPa, elongation after fracture Z： 18.5%, -40 DEG C of Impact energy Ak v2：23J.

Claims (9)

1. a kind of microalloy high-strength high-ductility steel containing Cu, it is characterised in that：Described microalloy high-strength high-ductility steel is each Constituent content is in percentage by weight
C：0.10～0.18%, Si：0.25～0.50%, Mn：1.00～1.70%, P≤0.020%, S≤0.015%, Cr≤ 0.30%, Cu≤0.50%, Ni≤0.50%, V≤0.20%, Ti：0.02～0.20%, Al >=0.015%, balance of Fe.
2. the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 1, it is characterised in that：Described microalloy is high-strength Spend in high-ductility steel, in percentage by weight Cu：0.18～0.28%, Ni：0.10～0.15%.
3. a kind of preparation method of the microalloy high-strength high-ductility steel containing Cu as claimed in claim 1 or 2, its feature exist In：Methods described includes, EAF-CONVERTER electricity converter smelting+LF+VD+CCM+ controlled rolling and controlled coolings.
4. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：EAF- Adopting during CONVERTER electricity converter tappings eccentric bottom tapping and stays steel to operate, and forbids slag of tapping, furnace rear with addition of low-carbon ferromanganese, Ferrosilicon, low-carbon ferrochromium, vanadium iron adjustment Mn, Si, Cr, V content.
5. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：LF refining Early stage carries out complex deoxidization using aluminum shot and carborundum, and slag to be refined adds copper to contain with nickel plate adjustment molten steel Cu, Ni after bleaching Amount, continues to smelt to 10 minutes addition ferrotianium adjustment Ti contents before LF bull ladles, and refining cycle was controlled in 40-70 minutes.
6. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：During VD, The pressurize more than 10 minutes under condition of high vacuum degree 67Pa, appropriate calcium line is fed after vacuum breaker carries out degenerative treatments, soft blow to field trash More than 20 minutes.
7. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：CCM connects Cast using whole process protection in casting casting cycle, the degree of superheat is controlled at 15～25 DEG C, improves matter inside strand using electromagnetic agitation Amount, two cold employing weak cold patterns.
8. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：Rolled 1030 ± 30 DEG C of roughing temperature is controlled in journey, 825 ± 25 DEG C of final rolling temperature is worn water and is quickly cooled to 630 ± 25 DEG C after rolling, cool down Speed 15-20 DEG C/min, cold bed on subsequent stocking enter to cheat slow cooling 36 hours after completing collecting and baling, 150 DEG C of temperature ＜ goes out hole.
9. the preparation method of the microalloy high-strength high-ductility steel of Cu is contained as claimed in claim 3, it is characterised in that：To rolling Gained stocking is heated to 935 ± 10 DEG C, is incubated 30 minutes, air-cooled to room temperature；420～500 DEG C are heated to, 50-60 point of insulation Room temperature is cooled to after clock.
CN201611103602.5A 2016-12-05 2016-12-05 Micro-alloy high-strength high-toughness steel containing Cu and production method thereof Active CN106555118B (en)

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