CN105543680B - Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method - Google Patents
Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 238000005096 rolling process Methods 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims description 24
- 230000009467 reduction Effects 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 230000001186 cumulative effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 235000019628 coolness Nutrition 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 206010016256 fatigue Diseases 0.000 claims 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000004886 process control Methods 0.000 abstract description 3
- 229910001563 bainite Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 7
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
- C22C38/12—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method, belong to Wide and Thick Slab production technical field.Smelting process controls C：0.07%~0.09%, N：≤ 0.0040%, P：≤ 0.012%, S：≤ 0.005%, B：0.0005%~0.0010%；And ensure carbon equivalent Ceq in the range of 0.43~0.48%, the Ti of addition 0.015%~0.025%；Using walking beam heating furnace by heating of plate blank to 1160 DEG C~1220 DEG C；Using two-phase control rolling and control cooling；For 30mm ＜ steel plate thickness≤50mm, 300mm think gauge continuous casting billets are selected；For 50mm ＜ steel plate thickness≤80mm, 400mm think gauge continuous casting billets are selected.Advantage is：Alloy is reasonable in design, and cost of alloy is low, can steady production high-strength thick-specification steel plate.
Description
Technical field
The invention belongs to Wide and Thick Slab production technical field, more particularly to a kind of micro- boron processing tensile strength 700MPa levels are generous
Plate and manufacture method.More particularly to a kind of micro- boron processing TMCP state tensile strength 700MPa levels Wide and Thick Slabs and its manufacture method.
Background technology
Tensile strength 700MPa grade high-strength structural steel has high intensity, high tenacity, excellent processing characteristics and weldability
The features such as energy, it is mainly used in the fields such as engineering machinery, coal mine machinery, shipbuilding and steel construction.
Horizontal traditional ferrite pearlific steel ultimate tension is only 550MPa or so；Quenching and tempering, high, its is high-strength
Degree is to sacrifice toughness and weldability as cost, certain contradiction between high intensity, toughness and welding performance be present. Cr、No、
Ni suppresses the pearly-lustre of ferrite one of steel as bainite formation element by forming the effects such as carbide or stable austenite
Body changes, so as to promote bainite type change.B forms the metal diboride of hexagonal structure by Grain Boundary Segregation in grain boundaries
Thing first analyses ferritic formation so as to inhibit so that stable bainite type group can be obtained in the range of wider cooling rate
Knit.Because B is that interstitial atom diffusion velocity in austenite is much larger than interstitial atom, thus a small amount of B cans reach Cr,
The effect of the elements such as Mo, Ni.Because B element will play the premise for the effect for improving quenching degree in the steel plate of TMCP technique productions
It is to suppress C-shaped in B and steel into Fe23(C, B)6, and cause occur austenite to B before ferritic transformation on crystal boundary partially
It is poly-, it is therefore necessary to containing a certain amount of carbide, Fe is suppressed with this23(C, B)6Generation, and Carbide Precipitation
Temperature necessarily be greater than austenite to ferrite transformation temperature.Boron atom radius is smaller, easily produces segregation in crystal boundary；The B of denier
Quenching degree with regard to steel can be significantly improved.Boracic low-carbon bainite steel air cooling is organized as granular bainite and adds a small amount of ferrite and pearl
Body of light, the difference of heating-up temperature, structure refinement degree is different after its phase transformation, and the high structure refinement degree of heating-up temperature is poor.
For high strength steel containing B, effects of the micro- B in steel how is given full play to, is not being added to armor plate strength
And the element that toughness is favourable, under the conditions of such as Mo, Ni element, only pass through TMCP technique productions thick steel plates, its intensity, impact
, some problems be present in the matching of toughness.
Contrast patent 1：A kind of 550 Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof (application
Number：The A of CN 102162065), using C：0.05~0.10%, Si：0.20~0.50%, Mn：1.50~1.80%, S≤
0.010%th, P≤0.018%, Nb≤0.10%, Mo≤0.10%, Ti：0.010~0.040%, B：0.0010~
0.0030%th, Cr：0.20~0.50%, Al：0.015~0.050%, by adjustment member constituent content, microalloy treatment,
TMCP technique productions, controlled rolling and water cooling, it is not required to be heat-treated, produces with the good bainite of intensity high and low temperature toughness
Steel for engineering machinery.The patent strictly controls steelmaking process by using alloying elements such as addition a certain amount of Mo, Cr, right
Steelmaking process requirement is more harsh；Simultaneously in the patent Example, steel plate maximum gauge only 30mm, and its tensile strength scope exists
It is similar with Q460 rank steel grades between 600MPa-700MPa.
Contrast patent 2：The yield strength 550Mpa strong hull of superelevation and offshore platform steel and its production method (application
Number：The A of CN 102400063), using C0.04~0.07%, Si0.3~0.5%, Mn1.45~1.60%, P≤0.02%, S
≤ 0.005%, Cr0.25~0.4%, Ni0.6~0.8%, Mo0.2~0.3%, V0.04~0.06%, Cu0.6~
0.8%th, Als0.015~0.045%, cooling is rolled and controlled using two-stage control, obtains lath-shaped bainite and ferrite
Tissue, can meet national standard FH550 grade of steel requirements.The patent is increased using more alloying elements cr, Ni, Mo, Cu, cost
While adding, also increase the difficulty of steel billet smelting process；It is equal to cumulative deformation during two-phase control rolling in the operation of rolling
It there are certain requirements, increase mill load, reduce production efficiency.
The content of the invention
It is an object of the invention to provide a kind of micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method, solve
Think gauge high-strength steel sheet containing B intensity deficiency, impacts the problem of unstable.
With reference to existing tooling device advantage and strict technical process control, TMCP state yield strength tensions are rationally designed
Intensity 700MPa grade high-strength structural steel component systems, using low C, high Mn, micro- B, and are properly added microalloy element
Nb, V, Ti, on the premise of any precious alloy Ni, Mo, Cr, Cu is not added, by TMCP techniques, successfully develop tensile strength
700MPa level thickness specification 30mm-80mm high-tensile structural steels.
A kind of micro- boron processing tensile strength 700MPa level Wide and Thick Slabs, chemical composition is by weight percentage for it, C：0.07%
~0.09%；Si：0.30%~0.50%；Mn：1.80%~2.00%；Nb：0.04%~0.06%；V：0.08%~
0.10%；Ti：0.015%~0.025%；Alt：0.03%~0.05%；B：0.0005%~0.0010%； N：≤
0.0040%；P：≤ 0.012%；S：≤ 0.005%；Remaining is Fe and inevitable impurity.Carbon equivalent Ceq (%)=C+Mn/
6+ (Cr+Mo+V)/5+ (Ni/+Cu)/15, and Ceq scopes：0.43~0.48%.
Mn is important obdurability element, mainly plays solution strengthening effect, and in appropriate scope, the intensity of steel is with Mn
The increase of content and improve, while brittle transition temperature decline, help to realize the refinement of bainite Effective grain size.B can be carried
Gao Gang quenching degree, play a part of to strengthen crystal boundary, but B content is too high, it is unfavorable to toughness；Meanwhile B is easily combined with N, slacken B and exist
Effect in steel, therefore a certain amount of solid N element Ti is added in this patent, and strict control is done to N content；Simultaneously to harmful element
Content proposes strict requirements, it is specified that P≤0.012%, S≤0.005%, to improve the degree of purity of steel, improve steel plasticity,
Toughness, weldability etc..
A kind of manufacture method of micro- boron processing tensile strength 700MPa level Wide and Thick Slabs, is produced using normal smelting and slab
Method, its process are as follows：Desulfurizing iron is skimmed → converter smelting → LF stoves refining → RH application of vacuum → slab casting → steel plate
Rolling and cooling.
Specific steps and parameter are as follows：
1st, in smelting process, C, P, S, N, B component, by mass percentage, C are strictly controlled：0.07%~0.09%,
N：≤ 0.0040%, P：≤ 0.012%, S：≤ 0.005%, B：0.0005%~0.0010%；And ensure that carbon equivalent Ceq exists
In the range of 0.43~0.48%；The Ti of addition 0.015%~0.025%, to ensure Ti/N ＞ 4.0, fully admittedly N, makes addition
Micro B, exist at utmost in the form of being dissolved state, to improve effects of the B in rolling and Cooling Process.
2nd, heating of plate blank：Using walking beam heating furnace by heating of plate blank between 1160 DEG C~1220 DEG C of design temperature,
And control each bringing-up section temperature slab time inside furnace is 220min~360min, ensures that slab fills between 950 DEG C~1260 DEG C
Divide austenitizing.
3rd, steel plate rolling and cooling：In the operation of rolling, using two-phase control rolling (recrystallization zone and non-recrystallization zone roll)
And control cooling (ACC section coolings)；Recrystallization zone rolling end temp is 950 DEG C~1000 DEG C；Steel plate treat temperature thickness by 2~
4 times of finished steel plate thickness settings；Non- recrystallization zone rolling start temperature is 860 DEG C~920 DEG C, its end temp 780 DEG C~
Between 800 DEG C.Cooling facility for laminar flow is rapidly entered after steel plate rolling to be cooled down；Steel plate enters coolant-temperature gage by 750 DEG C~780 DEG C controls
System, final cooling temperature are set by 450 DEG C~500 DEG C controls, cooling rate by 15 DEG C/s~25 DEG C/s.After the completion of water cooling, steel plate is fast
The offline heap of speed is cold, 350 DEG C~500 DEG C of the cold temperature of heap, and the control of heap cool time is in 48h-72h, to reach self tempering purpose, simultaneously
Reduce steel plate internal stress.
4th, according to steel plate thickness specification, reasonable selection continuous casting billet specification；For 30mm ＜ steel plate thickness≤50mm, selection
300mm think gauge continuous casting billets；For " 50mm ＜ steel plate thickness≤80mm ", 400mm think gauge continuous casting billets being selected, to fully ensure that
Cumulative deformation during reduction in pass and two-phase control rolling in the operation of rolling.Ensure recrystallization zone rolling sequence accumulated deformation
Amount >=60%, recrystallization zone rolls last percentage pass reduction >=15%；Non- recrystallization zone rolling sequence cumulative deformation exists
50%~75%, non-recrystallization zone rolls last reduction in pass in 1.0mm~3.0mm, with ensure internal quality of steel plate,
External mass and comprehensive mechanical property.
Pass through process above flow, the micro- boron processing produced, TMCP states, tensile strength 700MPa level Wide and Thick Slab mechanical property
Can be stable, there is preferable intensity, plasticity, toughness, and there is excellent welding performance.
Wide and Thick Slab items mechanical performance index：560MPa≤Rp0.2 (yield strength)≤620MPa, 700MPa≤Rm is (anti-
Tensile strength)≤800MPa, 16.0%≤A (elongation after fracture)≤22.0%, 180J≤- 20 DEG C-AKv (- 20 DEG C of impact values)≤
250J, 100J≤- 40 DEG C of-AKv (- 40 DEG C of impact values)≤200J, steel plate thickness specification 30mm~80mm.
The advantage of the invention is that：Alloy design comparison is reasonable, and cost of alloy is low；It is only logical without tempering or modifier treatment
Cross Rational Composition design and rolling, Cooling Process control, can steady production high-strength thick-specification, it is and thick with good impact toughness
Specification steel plate.
Brief description of the drawings
Fig. 1 is that 30mm specification steel plates roll state metallographic structure in embodiment 1.
Fig. 2 is that 80mm specification steel plates roll state metallographic structure in embodiment 2.
Embodiment
Embodiment 1
A kind of micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method, learn component requirements and are shown in Table 1,
4300mm Heavy Plate Rolling Lines complete steel billet smelting, slab casting (slab specification-thickness * width * length： 300mm×
2000mm~2400mm × 2700mm~4100mm) and steel plate rolling (rolling specs-thickness * width * length：30mm*
2500mm*24000mm, the rolling of 2 scales)
The chemical composition (wt%) of 1 embodiment of table 1
| C | Si | Mn | P | S | Alt | V | Nb | Ti | B | N | Ceq | Ti/N ratios |
| 0.072 | 0.35 | 1.85 | 0.012 | 0.005 | 0.033 | 0.082 | 0.048 | 0.017 | 0.0006 | 0.0038 | 0.44 | 4.47 |
Rolling technological parameter sets and is shown in Table 2.
The rolling technological parameter of 2 embodiment of table 1 is set
Note：Thickness unit-mm；Temperature unit-DEG C；Cooling velocity-DEG C/s
Recrystallization zone rolling sequence cumulative deformation 65%, recrystallization zone roll last percentage pass reduction 20%, it is non-again
For crystal region rolling sequence cumulative deformation 71%, non-recrystallization zone rolls last reduction in pass in 1.8mm.Embodiment 1
Steel plate items mechanical property is as shown in table 3.
The steel plate items mechanical property of 3 embodiment of table 1
Embodiment 2
A kind of micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method, chemical composition requirement are shown in Table 4,
4300mm Heavy Plate Rolling Lines complete steel billet smelting, slab casting (slab specification-thickness * width * length： 400mm×
2000mm~2400mm × 2700mm~4100mm) and steel plate rolling (rolling specs-thickness * width * length：80mm*
2500mm*12000mm, the rolling of 1 scale)
The chemical composition (wt%) of 4 embodiment of table 2
| C | Si | Mn | P | S | Alt | V | Nb | Ti | B | N | Ceq | Ti/N ratios |
| 0.087 | 0.35 | 1.92 | 0.010 | 0.003 | 0.040 | 0.092 | 0.052 | 0.019 | 0.0010 | 0.0040 | 0.47 | 4.75 |
The rolling technological parameter of embodiment 2 sets and is shown in Table 5.
The rolling technological parameter of table 5 is set
Note：Thickness unit-mm；Temperature unit-DEG C；Cooling velocity-DEG C/s
Recrystallization zone rolling sequence cumulative deformation 60%, recrystallization zone roll last percentage pass reduction 19%, it is non-again
For crystal region rolling sequence cumulative deformation 50%, non-recrystallization zone rolls last reduction in pass in 2.0mm.Embodiment 2
Steel plate items mechanical property is as shown in table 6.
The steel plate items mechanical property of table 6
Claims (5)
1. a kind of micro- boron processing tensile strength 700MPa level Wide and Thick Slabs, it is characterised in that chemical composition by weight percentage is C：
0.07%~0.09%；Si：0.30%~0.50%；Mn：1.80%~2.00%；Nb：0.04%~0.06%；V：0.08%
~0.10%；Ti：0.015%~0.025%；Alt：0.03%~0.05%；B：0.0005%~0.0010%；N：≤
0.0040%；P：≤ 0.012%；S：≤ 0.005%；Remaining is Fe and inevitable impurity；
Carbon equivalent scope is 0.43~0.48wt%；
Process includes：Desulfurizing iron is skimmed → converter smelting → LF stoves refining → RH application of vacuum → slab casting → steel plate rolling
And cooling；Step and parameter are as follows：
1) in smelting process, control C, P, S, N, B component, by mass percentage, C：0.07%~0.09%, N：≤
0.0040%, P：≤ 0.012%, S：≤ 0.005%, B：0.0005%~0.0010%；And ensure carbon equivalent Ceq 0.43~
In the range of 0.48%；The Ti of addition 0.015%~0.025%, to ensure Ti/N ＞ 4.0；
2) heating of plate blank：Using walking beam heating furnace by heating of plate blank between 1160 DEG C~1220 DEG C of design temperature, and control
Each bringing-up section temperature is made between 950 DEG C~1260 DEG C, slab time inside furnace is 220min~360min, ensures that slab is fully difficult to understand
Family name's body；
3) steel plate rolling and cooling：In the operation of rolling, cooled down using two-phase control rolling and control；Recrystallization zone rolls end temp
For 950 DEG C~1000 DEG C；Steel plate treats that temperature thickness is set by 2~4 times of finished steel plate thickness；Non- recrystallization zone rolls start temperature
860 DEG C~920 DEG C, its end temp is between 780 DEG C~800 DEG C；Cooled down after steel plate rolling into cooling facility for laminar flow；
Steel plate enter coolant-temperature gage by 750 DEG C~780 DEG C control, final cooling temperature by 450 DEG C~500 DEG C control, cooling rate by 15 DEG C/s~25 DEG C/
S is set；After the completion of water cooling, the offline heap of steel plate is cold, 350 DEG C~500 DEG C of the cold temperature of heap, and heap cool time is controlled in 48h-72h,
To reach self tempering purpose, while reduce steel plate internal stress；
4) for 30mm ＜ steel plate thickness≤50mm, 300mm think gauge continuous casting billets are selected；For 50mm ＜ steel plate thickness≤
80mm, 400mm think gauge continuous casting billets are selected, tired out with fully ensuring that in the operation of rolling during reduction in pass and two-phase control rolling
Product deflection.
2. the manufacture method of Wide and Thick Slab, process are as follows described in a kind of claim 1：Desulfurizing iron is skimmed → converter smelting → LF stoves
Refining → RH application of vacuum → slab casting → steel plate rolling and cooling；Characterized in that, step and parameter are as follows：
1) in smelting process, control C, P, S, N, B component, by mass percentage, C：0.07%~0.09%, N：≤
0.0040%, P：≤ 0.012%, S：≤ 0.005%, B：0.0005%~0.0010%；And ensure carbon equivalent Ceq 0.43~
In the range of 0.48%；The Ti of addition 0.015%~0.025%, to ensure Ti/N ＞ 4.0；
2) heating of plate blank：Using walking beam heating furnace by heating of plate blank between 1160 DEG C~1220 DEG C of design temperature, and control
Each bringing-up section temperature is made between 950 DEG C~1260 DEG C, slab time inside furnace is 220min~360min, ensures that slab is fully difficult to understand
Family name's body；
3) steel plate rolling and cooling：In the operation of rolling, cooled down using two-phase control rolling and control；Recrystallization zone rolls end temp
For 950 DEG C~1000 DEG C；Steel plate treats that temperature thickness is set by 2~4 times of finished steel plate thickness；Non- recrystallization zone rolls start temperature
860 DEG C~920 DEG C, its end temp is between 780 DEG C~800 DEG C；Cooled down after steel plate rolling into cooling facility for laminar flow；
Steel plate enter coolant-temperature gage by 750 DEG C~780 DEG C control, final cooling temperature by 450 DEG C~500 DEG C control, cooling rate by 15 DEG C/s~25 DEG C/
S is set；After the completion of water cooling, the offline heap of steel plate is cold, 350 DEG C~500 DEG C of the cold temperature of heap, and heap cool time is controlled in 48h-72h,
To reach self tempering purpose, while reduce steel plate internal stress；
4) for 30mm ＜ steel plate thickness≤50mm, 300mm think gauge continuous casting billets are selected；For 50mm ＜ steel plate thickness≤
80mm, 400mm think gauge continuous casting billets are selected, tired out with fully ensuring that in the operation of rolling during reduction in pass and two-phase control rolling
Product deflection.
3. according to the method for claim 2, it is characterised in that two-phase control rolling described in step 3) for recrystallization zone and
Non- recrystallization zone rolling；Control is cooled to ACC section coolings.
4. according to the method for claim 2, it is characterised in that ensure recrystallization zone rolling sequence accumulated deformation in step 4)
Amount >=60%, recrystallization zone rolls last percentage pass reduction >=15%；Non- recrystallization zone rolling sequence cumulative deformation exists
50%~75%, non-recrystallization zone rolls last reduction in pass in 1.0mm~3.0mm.
5. according to the method for claim 2, it is characterised in that the Wide and Thick Slab items mechanical performance index of manufacture：560MPa
≤ yield strength≤620MPa, 700MPa≤tensile strength≤800MPa, 16.0%≤elongation after fracture≤22.0%, 180J
≤ -20 DEG C of impact value≤250J, 100J≤- 40 DEG C of impact value≤200J, steel plate thickness specification 30mm~80mm.
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| CN109487063B (en) * | 2018-12-21 | 2020-08-11 | 昆明理工大学 | Controlled rolling and controlled cooling process for Ti-V-N composite microalloyed nano-particle reinforced low-carbon steel |
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