CN109797342A - It is a kind of for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate and its manufacturing method - Google Patents
It is a kind of for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate and its manufacturing method Download PDFInfo
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Abstract
The present invention relates to a kind of high intensity for structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate, elemental composition wt%:C:0.03%~0.10%, Si:0.30%~0.50%, Mn:1.10%~1.50%, P≤0.010%, S≤0.003%, Cr:0.45%~0.70%, Cu:0.25%~0.40%, Ni:0.30%~0.40%, Alt: >=0.030%, Ti:0.006%~0.030%, V:0.040%~0.080%, Mo:0.02%~0.08%, Ca:0.0010%~0.0030%, N:0.0020%~0.0080%, B:0.0002%~0.0 030%, Ce:0.001~0.010%, atmospheric corrosion resistance index I > 6.5, CEV≤0.54, Pcm≤0.27, surplus are Fe and inevitable impurity.The application obtains the quality plate with bainite structure using the design of specified chemical ingredient and steel plate modulation process, can be used in the structure steel fabrications such as bridge, skyscraper.
Description
Technical field
The present invention relates to the thick steel plate productions for structure steel fabrication, and in particular to a kind of high intensity, high tenacity, resistance to atmosphere
The thick steel plate of corrosion.
Background technique
As bridge construction develops to directions such as large span, heavy load, atmospheric corrosion resistances, in addition, skyscraper etc. is to steel
The construction demand of structure large-scale also increases increasingly, and structural steel steel plate used in structure steel fabrication is also gradually to high-intensitive, high-ductility
The directions such as property, big thickness, atmospheric corrosion resistance are developed.High intensity, high tenacity, atmospheric corrosion resistance thick steel plate become steel construction steel
The important research direction of panel products manufacturing enterprise.
Summary of the invention
It can be used for the steel knot such as large bridge, skyscraper the object of the present invention is to provide a kind of thickness 60mm~120mm
The Plate Production method of structure, the intensity, toughness of steel plate, elongation after fracture meet outside the production requirement of steel construction, also have excellent
Atmospheric corrosion resistance.
The present invention solves the above problems used technical solution are as follows: a kind of high intensity for structure steel fabrication, high-ductility
Property, atmospheric corrosion resistance steel plate, elemental composition by mass percentage: C:0.03%~0.10%, Si:0.30%~0.50%,
Mn:1.10%~1.50%, P≤0.010%, S≤0.003%, Cr:0.45%~0.70%, Cu:0.25%~0.40%,
Ni:0.30%~0.40%, Alt: >=0.030%, Ti:0.006%~0.030%, V:0.040%~0.080%, Mo:
0.02%~0.08%, Ca:0.0010%~0.0030%, N:0.0020%~0.0080%, B:0.0002%~
0.0030%, Ce:0.001~0.010%, atmospheric corrosion resistance index I > 6.5, CEV≤0.54, Pcm≤0.27, surplus Fe
With inevitable impurity.
The calculation of atmospheric corrosion resistance corrosion index I is as follows
The application steel sheet product with a thickness of 60mm-120mm, yield strength Rp0.2 >=485MPa, tensile strength Rm >=
595MPa, elongation after fracture A >=20%, -23 DEG C of shock absorption energy >=120J.
Steel plate of the present invention is mentioned using Design of Chemical Composition low-carbon-equivalent (CEV) and low-welding crack-sensitive index (Pcm)
High steel plate welding performance, Cr, Cu, Si, Ni etc. improve the atmospheric corrosion resistance of steel, appropriate carbon and V, Ni, Cr, Cu, Mo and B etc.
Alloying element proportion solves performance issues, Al, Ti, Ce, the Ca etc. such as armor plate strength, toughness and refines Plate Production difference work respectively
The tissue in sequence stage improves in steel and remains inclusion morphology, in conjunction with the harmful elements content such as extremely low P, S, effectively improves steel plate
Comprehensive performance.
The effect of each element and content in the present invention is in steel plate:
(1), carbon (C)
Carbon improves the harden ability of steel, influences Morphology of Bainite after quenching, improves intensity, but with interstitial atom or with carbide
The low-temperature flexibility and welding performance that form is precipitated and excessively long conference deteriorates steel, therefore carbon (C) content controlled 0.03%~
0.10%.
(2), silicon (Si)
It is reducing agent and deoxidier most economical in steelmaking process, the resistance to big of steel can be improved in the element silicon remained in steel
Gas corrosion performance, but when content is more than 0.5%, the cleanliness of steel reduces, and can improve the ductile-brittle transition temperature of steel significantly, together
When can also deteriorate plasticity, surface easily increases iron scale and is not easy to remove when heating.Therefore, the appropriate amount control of Si is existed
0.30%~0.50%.
(3), manganese (Mn)
It is Strengthening and Toughening element important in steel, the phase transition temperature of steel can be reduced, reducing the lower change point of steel, (reduction is faced
Boundary transition temperature Ar3), it improves harden ability and increases the cooling degree of supercooling of austenite, improve the low-temperature flexibility of steel, relatively other alloys
It is low in cost, but will increase the trend of steel continuous casting segregation when too high levels, therefore the present invention uses the content of Mn for 1.10%
~1.50%.
(4), phosphorus (P)
The corrosion resistance of steel can be improved, but belong to black brittleness element, it is highly unwanted to low-temperature flexibility and a kind of
It is easy to the element being segregated, the two-phase section being significantly expanded between liquid phase and solid phase is segregated between crystal grain, shape in steel process of setting
At high phosphorus brittle layer, so that the part of steel is generated serious segregation, the plasticity and toughness of steel can be reduced, so that steel is also easy to produce brittleness and split
Line, the present invention mainly treat phosphorus (P) as brittleness element, reduce its content as far as possible.
(5), sulphur (S)
It is the harmful element in steel, when being present in steel in the form of MnS, easily assembles in center segregation, serious shadow
Ring the toughness and plasticity of steel.Therefore its content is reduced as far as possible.
(6), chromium (Cr)
It is to improve one of most important element of steel atmospheric corrosion resistance, while improving the harden ability of steel, after improvement is quenched
The toughness and plasticity of steel improve the tensile strength (Rm) of steel, while slightly improving the plasticity of steel.Too high levels are also easy to produce carbonization
Object is precipitated, and influences the toughness of steel, deteriorates welding performance, when being tempered after quenching, it may occur that post-curing phenomenon.Therefore by chromium
(Cr) control exists
(7), copper (Cu)
It is to improve one of most important element of steel atmospheric corrosion resistance.Cu is to expand austenite phase p-block element p, improves steel
Harden ability, and play solid solution and precipitation enhancement in steel, the intensity of steel can be improved.Furthermore it is good to also help acquisition by Cu
Good low-temperature flexibility.But when too high levels, when heating steel billet or hot rolling, is also easy to produce hot-short, deteriorates surface of steel plate performance.The present invention
Copper (Cu) is controlled 0.25%~0.40%.
(8), nickel (Ni)
One side Ni makes the toughness of iron keep high level always, keeps its brittle transition temperature extremely low, can refine steel
Crystal grain, improve the low-temperature flexibility of steel；Another aspect plays a part of reinforced ferrite by forming simple substitution solid solution, can
Improve the intensity of steel.In addition, Ni can effectively prevent the hot-short caused check crack of Cu.Copper (Cu) of the present invention control 0.30%~
0.40%.
(9), aluminium (AL)
AL is strong deoxidant element, after Si deoxidation, with AL final deoxidizing, reduces oxygen and oxide inclusion content in steel, improves
The comprehensive performance of steel；Certain residual aluminum has the function of that heating process inhibits AUSTENITE GRAIN COARSENING in steel.General dissolved aluminum
(ALs) control is 0.015% or more, and full aluminium (ALt) control is 0.020% or more.
(10), titanium (Ti)
It is strong carbonitride-forming elements, trace Ti can form the carbide of tiny titanium, nitride particles, effectively pin
Austenite grain boundary inhibits the roughening of austenite grain, and heating process crystal grain is prevented to grow up, and improves steel plate toughness.In addition, in steel plate
The compound of the Ti of highly dispersed distribution can prevent crystal grain in welding process from growing up, and improve the toughness of welding heat affected zone.
(11), vanadium (V)
V has strong precipitation enhancement, and the carbonitride of V can be used as effective core position and promote Intragranular Acicular Ferrite forming core
Have the function that refine crystal grain there can be apparent strengthen and toughening effect in low-carbon bainite steel.It is solid when dissolving at high temperature
Increase the harden ability of steel when solution, while V increases the temper resistance of hardened steel, therefore intensity can be improved in V in quenched and tempered steel, and
And improve yield tensile ratio.Comprehensively consider, the appropriate amount of V is controlled 0.040%~0.080%.
(12), molybdenum (Mo)
The C curve of steel phase transformation can be made to move to right, significantly improve harden ability, the hardenability of steel, especially can be improved returning for steel
Fiery stability improves steel plate obdurability conducive to the quenched rear tempered sorbite for obtaining fine grain.
(13), calcium (Ca)
Ca first is extremely strong deoxidant element, is conducive to molten steel deep deoxidation；Secondly Ca can change deoxidation, desulfurization product
On the one hand matter reduces field trash, on the other hand improves the adverse effect for remaining on the field trash in steel；In addition, remaining Ca in steel
Compound can also improve the welding performance of steel.Ca is controlled 0.0010%~0.0030%.
(14), nitrogen (N)
The cooperation of the elements such as N and V, Ti, can play the effect of its thinning microstructure.But N can play the quenching timeliness and shape of steel
Become timeliness.The present invention limits N content 0.0020%~0.0080%.
(15), boron (B)
B can significantly improve steel plate harden ability, improve harden ability, hardenability to improve intensity and hardness, but it is in crystal boundary
Segregation can have an impact steel plate toughness.B content is controlled 0.0002%~0.0030%.
(16), cerium (Ce)
It can improve and remain inclusion morphology in steel.In the steel compared with low carbon content, the transformation temperature of steel is influenced, austenite is slowed down
To bainite transformation, the harden ability of steel is improved, it can thinning microstructure.Changeable Carbide Precipitation position, by crystal boundary and transgranular point
Cloth becomes mainly in transgranular distribution, and refined carbides, inhibits aggregation, the roughening of Carbide Phases, improves the intensity and toughness of steel.
The object of the invention is also to provide the manufacturing methods of above-mentioned steel plate, and specific step is as follows
(1) molten iron carries out just refining first in BOF top and bottom combined blown converter after KR is pre-processed, and control molten steel [P]≤
0.005%, it taps after [C]≤0.05% to steel ladle；Subsequently into LF refining process, LF refining process makes white slag, refining agent
Total dosage is no less than 18kg/t steel, feeds aluminum steel precipitation desoxydation, and the control of overall process molten steel [AL] content is used 0.010% or more
Low-carbon alloy accurate adjustment composition makes each object element ingredient reach target value；It is true into RH after temperature reaches 1600 DEG C~1680 DEG C
Empty treatment process, the processing time under the conditions of < 130Pa condition of high vacuum degree are no less than 20min, be vacuum-treated front and back to molten steel Ca at
Reason, guarantees that final molten steel Ca content reaches 0.0010%~0.0030%, in thickness 370mm~450mm continuous casting after vacuum processing
Continuous casting steel billet is cast on machine.
(2) continuous casting steel billet is warming up to 1180 DEG C~1280 DEG C in step-by-step movement continuous furnace, soaking zone keep the temperature 50min~
120min makes continuous casting billet core also reach 1180 DEG C~1280 DEG C, out heating furnace, removes surface oxidation iron through high-pressure water descaling
Slab, is just rolled to 1.6-2.4 times of finished product thickness, then finish rolling to finished product thickness by skin immediately, and control finish rolling start rolling temperature exists
780 DEG C~880 DEG C, finishing temperature is at 800 DEG C hereinafter, steel plate passes through ACC water cooling to 500 DEG C~650 DEG C, then Slow cooling after rolling
To room temperature.
(3) conditioned heat treatment obtains bainite structure, produces the steel plate of performance qualification.
Further, the steel plate of performance qualification, step (3) Tempering and Quenching are quenching and tempering in order to obtain.
When quenching, steel plate is heated to 900 DEG C~950 DEG C, soaking time 0.3min/mm~1.0min/mm, abundant austenite
Change and the solid solution of alloying element, after reaching soaking time, steel plate goes out heating furnace and immediately enters to quench in continuous rolling pressure type quenching press,
Quenching press roller-way speed of service 0.8m/min~3.5m/min, makes cooling velocity reach 12 DEG C/s or more.
When tempering, steel plate is heated to 590 DEG C~650 DEG C of tempering temperature in continous way tempering furnace, soaking time
2.5min/mm~4.5min/mm, then heating furnace naturally cools to room temperature out.
Compared with the prior art, the advantages of the present invention are as follows: the Design of Chemical Composition of steel plate of the present invention uses low C, low-carbon
Equivalent (CEV) and low-welding crack-sensitive index (Pcm) improve steel plate welding performance；Cr, Cu, Si, Ni etc. guarantee the resistance to of steel
Atmospheric corrosion performance；LF refining process Si and Al combined deoxidation realizes molten steel high cleanliness；Molten steel is controlled before RH application of vacuum
Si, Al content and the molten steel face quantity of slag, slag condition, further cleaning molten steel under high vacuum condition, RH application of vacuum process is to molten steel Ca
Processing changes inclusion morphology in molten steel, realizes that inclusion content of steel is extremely low and type, form are controllable, drops to the full extent
Adverse effect of the low field trash to final steel plate plasticity, toughness；In continuous casting billet solidification processing, Al, Ti, V selectivity and C, N knot
It closes, fixed N avoids the chemical combination of B, avoids the formation of bulky grain TiN and be mingled with, forms C, N compound of fine dispersoid, for heating, controlled rolling
And post precipitation reinforcing creates conditions, low C combines appropriate Mn, V, Cr, Mo content, reduces continuous casting slab segregation degree, is that steel plate is thick
Degree different location performance uniformly lays good basis；The continuous casting billet heating process before rolling, C, N compound effectively pin Ovshinsky of V, Ti
Body crystal boundary inhibits the roughening of austenite grain, and heating is abundant and avoids Austenite Grain Growth, lays base for steel plate superperformance
Plinth；Rolling process except molding, guarantee steel plate good appearance, size, in addition to surface quality, V, Cr, Ce element and controlled rolling process, control are cold
Technique combines, and gives full play to the effect of refinement steel plate prototype micro tissue；Cr, Mo strong influence steel plate CCT curve, make bainite
Transition curve and the separation of perlitic transformation curve, in quenching front spring heating process, V, Cr, Ni, Cu, Mo, Ce and B improve steel plate
Harden ability and hardenability improve the stability of austenite, guarantee that quenching obtains ideal bainite structure form；Mo improves steel plate
Temper resistance controls Carbide Precipitation in conjunction with the effect of Ce, and steel plate reaches ideal microstructure after guaranteeing tempering, finally obtains
The steel plate of particular characteristic is obtained, armor plate strength is high, toughness is high, atmospheric corrosion resistance, and steel plate thickness reaches 60mm~120mm.It can be extensive
Manufacture for steel constructions such as large bridges.
The application production process includes but is not limited to modifier treatment, and steel plate utilizes the online direct quenching of residual temperature after rolling, and
The dependent interaction of the application chemical element is played, the basic principle setting of the application quenching is played, so, steel plate utilizes after rolling
The online direct quenching of residual temperature, the method production being then tempered, should be included within the application.
Detailed description of the invention
Fig. 1 is 60mm yield strength (Rp0.2) 485MPa grades of thick steel plate metallographic structures；
Fig. 2 is 101mm yield strength (Rp0.2) 485MPa grades of thick steel plate metallographic structures；
Fig. 3 is 120mm yield strength (Rp0.2) 485MPa grades of thick steel plate metallographic structures.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment one
The steel plate thickness 60mm of the present embodiment.It is formed by the component melting of following mass percent: C:0.05%,
Si:0.38%, Mn:1.36%, P:0.010%, S:0.0018%, Cr:0.59%, Cu:0.32%, Ni:0.34%, Alt:
0.039%, Ti:0.009%, V:0.055%, Mo:0.03%, Ca:0.0010, N:0.0031%, B:0.0005%, Ce:
0.006, atmospheric corrosion resistance index I:6.8, CEV:0.46, Pcm:0.19, surplus are Fe and inevitable impurity.
The step of the present embodiment yield strength (Rp0.2) 485MPa grades of thick steel plate production methods, is as follows:
The first step, molten iron carry out just refining first in 150t BOF top and bottom combined blown converter, control molten steel after KR is pre-processed
[P]: 0.005%, [C]: tap after 0.03% to steel ladle；LF refining process makes white slag, the total dosage 19kg/t steel of refining agent, entirely
Process molten steel [AL] content is 0.010%~0.039%, and using low-carbon alloy accurate adjustment composition, temperature is after 1650 DEG C, into RH
It is vacuum-treated process, < 130Pa condition of high vacuum degree handles time 20min, is vacuum-treated front and back molten steel Ca processing, and final molten steel Ca contains
Amount 0.0010%, is cast into continuous casting steel billet on thickness 370mm conticaster after vacuum processing.
Second step, continuous casting steel billet are warming up to 1260 DEG C in step-by-step movement continuous furnace, and soaking keeps the temperature 70min, makes continuous casting
Base core also reaches 1260 DEG C, out heating furnace, removes scale on surface through high-pressure water descaling case, rolls immediately in 4300mm slab
It just is rolled to 140mm on machine, then rolls 60mm on 4300mm finishing mill, finishing rolling control start rolling temperature is at 880 DEG C, finishing temperature
840 DEG C, rear steel plate is rolled by ACC water cooling to 610 DEG C, then slowly cool to room temperature.
Third step, steel plate are heated to 920 DEG C in continuous-type furnace, and soaking time presses 0.4min/mm plate thickness, and heating is protected
The solid solution for demonstrate,proving abundant austenitizing and alloying element, after reaching soaking time, steel plate goes out heating furnace and immediately enters continuous rolling pressure type
It is quenched in quenching press, quenching press roller-way speed of service 3.2m/min, cooling velocity reaches 15 DEG C/s.Then in continous way tempering furnace
Middle tempering, 640 DEG C of tempering temperature, soaking time 3.5min/mm, then heating furnace naturally cools to room temperature out.
485MPa grades of bridge steel plate performances of one yield strength of embodiment (Rp0.2) are as follows:
485MPa grades of thick steel plate performances of 60mm yield strength (Rp0.2)
One microstructure of embodiment is referring to Fig. 1, and crystal grain is tiny, uniform in steel plate tissue as can be seen from Figure, with intensity, tough
Property matching.
Embodiment two
The steel plate thickness 101mm of the present embodiment.It is formed by the component melting of following mass percent: C:0.08%,
Si:0.47%, Mn:1.45%, P:0.006%, S:0.0011%, Cr:0.66%, Cu:0.35%, Ni:0.36%, Alt:
0.051%, Ti:0.016%, V:0.059%, Mo:0.05%, Ca:0.0012, N:0.0028%, B:0.0008%, Ce:
0.009, atmospheric corrosion resistance index I:7.1, CEV:0.52, Pcm:0.24, surplus are Fe and inevitable impurity.
The step of the present embodiment yield strength (Rp0.2) 485MPa grades of thick steel plate production methods, is as follows:
The first step, molten iron carry out just refining first in 150t BOF top and bottom combined blown converter, control molten steel after KR is pre-processed
[P]: 0.004%, [C]: tap after 0.03% to steel ladle；LF refining process makes white slag, the total dosage 21kg/t steel of refining agent, entirely
Process molten steel [AL] content is 0.012%~0.045%, and using low-carbon alloy accurate adjustment composition, temperature is after 1660 DEG C, into RH
It is vacuum-treated process, < 130Pa condition of high vacuum degree handles time 25min, is vacuum-treated front and back molten steel Ca processing, and final molten steel Ca contains
Amount 0.0012%, is cast into continuous casting steel billet on thickness 450mm conticaster after vacuum processing.
Second step, continuous casting steel billet are warming up to 1220 DEG C in step-by-step movement continuous furnace, and soaking keeps the temperature 90min, makes continuous casting
Base core also reaches 1220 DEG C, out heating furnace, removes scale on surface through high-pressure water descaling case, rolls immediately in 4300mm slab
It just is rolled to 200mm on machine, then rolls 101mm on 4300mm finishing mill, finishing rolling control start rolling temperature is at 830 DEG C, finish to gauge temperature
800 DEG C of degree rolls rear steel plate by ACC water cooling to 580 DEG C, then slowly cools to room temperature.
Third step, steel plate are heated to 930 DEG C in continuous-type furnace, and soaking time presses 0.6min/mm plate thickness, and heating is protected
The solid solution for demonstrate,proving abundant austenitizing and alloying element, after reaching soaking time, steel plate goes out heating furnace and immediately enters continuous rolling pressure type
It is quenched in quenching press, quenching press roller-way speed of service 1.2m/min, cooling velocity reaches 16 DEG C/s.Then in continous way tempering furnace
Middle tempering, 610 DEG C of tempering temperature, soaking time 4.0min/mm, then heating furnace naturally cools to room temperature out.
485MPa grades of bridge steel plate performances of two yield strength of embodiment (Rp0.2) are as follows:
485MPa grades of thick steel plate performances of 101mm yield strength (Rp0.2)
Referring to fig. 2, crystal grain is tiny, uniform in steel plate tissue as can be seen from Figure for two microstructure of embodiment.
Embodiment three
The steel plate thickness 120mm of the present embodiment.It is formed by the component melting of following mass percent: C:0.07%,
Si:0.50%, Mn:1.46%, P:0.005%, S:0.0013%, Cr:0.69%, Cu:0.37%, Ni:0.39%, Alt:
0.049%, Ti:0.017%, V:0.065%, Mo:0.06%, Ca:0.0014, N:0.0032%, B:0.0009%, Ce:
0.008%, atmospheric corrosion resistance index I:7.2, CEV:0.53, Pcm:0.23, surplus are Fe and inevitable impurity.
The step of the present embodiment yield strength (Rp0.2) 485MPa grades of thick steel plate production methods, is as follows:
The first step, molten iron carry out just refining first in 150t BOF top and bottom combined blown converter, control molten steel after KR is pre-processed
[P]: 0.003%, [C]: tap after 0.03% to steel ladle；LF refining process makes white slag, the total dosage 23kg/t steel of refining agent, entirely
Process molten steel [AL] content is 0.015%~0.049%, and using low-carbon alloy accurate adjustment composition, temperature is after 1667 DEG C, into RH
It is vacuum-treated process, < 130Pa condition of high vacuum degree handles time 25min, is vacuum-treated front and back molten steel Ca processing, and final molten steel Ca contains
Amount 0.0014%, is cast into continuous casting steel billet on thickness 450mm conticaster after vacuum processing.
Second step, continuous casting steel billet are warming up to 1230 DEG C in step-by-step movement continuous furnace, and soaking keeps the temperature 106min, makes continuous casting
Base core also reaches 1230 DEG C, out heating furnace, removes scale on surface through high-pressure water descaling case, rolls immediately in 4300mm slab
It just is rolled to 230mm on machine, then rolls 120mm on 4300mm finishing mill, finishing rolling control start rolling temperature is at 810 DEG C, finish to gauge temperature
800 DEG C of degree rolls rear steel plate by ACC water cooling to 590 DEG C, then slowly cools to room temperature.
Third step, steel plate are heated to 930 DEG C in continuous-type furnace, and soaking time presses 0.8min/mm plate thickness, and heating is protected
The solid solution for demonstrate,proving abundant austenitizing and alloying element, after reaching soaking time, steel plate goes out heating furnace and immediately enters continuous rolling pressure type
It is quenched in quenching press, quenching press roller-way speed of service 1.0m/min, cooling velocity reaches 18 DEG C/s.Then in continous way tempering furnace
Middle tempering, 610 DEG C of tempering temperature, soaking time 4.0min/mm, then heating furnace naturally cools to room temperature out.
485MPa grades of bridge steel plate performances of the present embodiment yield strength (Rp0.2) are as follows:
485MPa grades of thick steel plate performances of 120mm yield strength (Rp0.2)
The microstructure of embodiment three is identical with embodiment one and two referring to Fig. 3, organizes as bainite, and crystal grain is tiny, equal
It is even.
Claims (9)
1. a kind of for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate, it is characterised in that: the element of steel at
Divide by mass percentage: C:0.03%~0.10%, Si:0.30%~0.50%, Mn:1.10%~1.50%, P≤
0.010%, S≤0.003%, Cr:0.45%~0.70%, Cu:0.25%~0.40%, Ni:0.30%~0.40%, Alt:
>=0.030%, Ti:0.006%~0.030%, V:0.040%~0.080%, Mo:0.02%~0.08%, Ca:
0.0010%~0.0030%, N:0.0020%~0.0080%, B:0.0002%~0.0030%, Ce:0.001~
0.010%, and meet atmospheric corrosion resistance index I > 6.5, carbon equivalent ce V≤0.54, Pcm≤0.27, surplus is Fe and can not keep away
The impurity exempted from.
2. according to claim 1 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate, feature
Be: the calculation of atmospheric corrosion resistance corrosion index I is as follows
I=26.01 × (%Cu)+3.88 × (%Ni)+1.20 × (%Cr)+1.49 × (%Si)+17.28 × (%P) -7.29
× (%Cu) × (%Ni) -9.10 × (%Ni) × (%P) -33.39 × (%Cu)2。
3. according to claim 1 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate, feature
It is: steel plate thickness 60mm-120mm, yield strength Rp0.2 >=485MPa, tensile strength Rm >=595MPa, elongation after fracture
A >=20%, -23 DEG C of shock absorption energy >=120J.
4. a kind of for the high intensity of structure steel fabrication, high tenacity, the manufacturing method of atmospheric corrosion resistance steel plate, it is characterised in that:
Steps are as follows
(1) through converter, just refining, LF refining, RH vacuum refining and slab continuous casting steel machine produce continuous casting billet to molten steel；
(2) continuous casting billet obtains slab through controlled rolling, control cooling；
(3) conditioned heat treatment obtains bainite structure, produces the steel plate of performance qualification.
5. it is according to claim 4 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate manufacturer
Method, it is characterised in that: in step (1), molten iron carries out just refining, control after KR is pre-processed first in BOF top and bottom combined blown converter
Molten steel [P]≤0.005% is tapped after [C]≤0.05% to steel ladle；Subsequently into LF refining process, LF refining process is made white
Slag, the total dosage of refining agent are no less than 18kg/t steel, feed aluminum steel precipitation desoxydation, and overall process molten steel [AL] content is controlled 0.010%
More than, using low-carbon alloy accurate adjustment composition, each object element ingredient is made to reach target value；Temperature reaches 1600 DEG C~1680 DEG C
Afterwards, into RH application of vacuum process, the processing time under the conditions of < 130Pa condition of high vacuum degree is no less than 20min, is vacuum-treated front and back
To molten steel Ca processing, guarantee that final molten steel Ca content reaches 0.0010%~0.0030%, after vacuum processing thickness 370mm~
Continuous casting steel billet is cast on 450mm conticaster.
6. it is according to claim 4 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate manufacturer
Method, it is characterised in that: in step (2), continuous casting steel billet is warming up to 1180 DEG C~1280 DEG C, and soaking zone keeps the temperature 50min~120min,
So that continuous casting billet core is also reached 1180 DEG C~1280 DEG C, out heating furnace, remove scale on surface through high-pressure water descaling, immediately will
Slab is just rolled to 1.6-2.4 times of finished product thickness, and then finish rolling to finished product thickness controls finish rolling start rolling temperature 780 DEG C~880
DEG C, finishing temperature at 800 DEG C hereinafter, after rolling steel plate by ACC water cooling to 500 DEG C~650 DEG C, then slowly cool to room temperature.
7. it is according to claim 4 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate manufacturer
Method, it is characterised in that: step (3) Tempering and Quenching is quenching and tempering.
8. it is according to claim 7 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate manufacturer
Method, it is characterised in that: when quenching, steel plate is heated to 900 DEG C~950 DEG C, soaking time 0.3min/mm~1.0min/mm, sufficiently
The solid solution of austenitizing and alloying element, after reaching soaking time, steel plate goes out heating furnace and immediately enters continuous rolling pressure type quenching press
Middle quenching, quenching press roller-way speed of service 0.8m/min~3.5m/min, makes cooling velocity reach 12 DEG C/s or more.
9. it is according to claim 7 for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate manufacturer
Method, it is characterised in that: when tempering, be arranged 590 DEG C~650 DEG C of tempering temperature, soaking time 2.5min/mm~4.5min/mm, so
Go out heating furnace afterwards and naturally cools to room temperature.
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