CN105543680A - Micro-boron treatment wide and thick plate with tensile strength grade of 700MPa and production method of wide and thick plate - Google Patents
Micro-boron treatment wide and thick plate with tensile strength grade of 700MPa and production method of wide and thick plate Download PDFInfo
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- CN105543680A CN105543680A CN201510967102.5A CN201510967102A CN105543680A CN 105543680 A CN105543680 A CN 105543680A CN 201510967102 A CN201510967102 A CN 201510967102A CN 105543680 A CN105543680 A CN 105543680A
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001953 recrystallisation Methods 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 230000001186 cumulative effect Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 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
- 238000009749 continuous casting Methods 0.000 abstract 2
- 229910001563 bainite Inorganic materials 0.000 description 8
- 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
- 230000000694 effects Effects 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 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
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 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
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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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
- C21D8/02—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)
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- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention relates to a micro-boron treatment wide and thick plate with tensile strength grade of 700MPa and a production method of wide and thick plate and belongs to the technical field of production of a wide and thick plate. In a smelting process, the weight percentage of the components are controlled as follows: 0.07-0.09% of C, less than or equal to 0.0040% of N, less than or equal to 0.012% of P, less than or equal to 0.005% of S, and 0.0005-0.0010% of B; carbon equivalent is kept in a scope of 0.43-0.48, and 0.015-0.025% of Ti is added; a stepping beam type heating furnace is adopted to heat a plate blank to 1160-1220 DEG C; two stages of rolling and cooling control are adopted; with regard to steel plate thickness of more than 30mm and less than or equal to 50mm, a continuous casting with specification of 300mm thick is selected; and with regard to steel plate thickness of more than 50mm and less than or equal to 80mm, a continuous casting with specification of 400mm thick is selected. The wide and thick plate and the production method thereof have the advantages of being reasonable in alloy design, low in alloy cost, and capable of stably producing high-strength steel plate with thick specifications.
Description
Technical field
The invention belongs to Wide and Thick Slab production technical field, particularly one micro-boron process tensile strength 700MPa level Wide and Thick Slab and manufacture method.Particularly relate to a kind of micro-boron process TMCP state tensile strength 700MPa level Wide and Thick Slab and manufacture method thereof.
Background technology
Tensile strength 700MPa grade high-strength structure iron has the features such as high strength, high tenacity, excellent processing characteristics and welding property, is mainly used in the fields such as engineering machinery, coal mine machinery, shipbuilding and steel construction.
Traditional ferrite pearlific steel ultimate tension level is only about 550MPa; Quenching and tempering, high, its high strength sacrifices toughness and weldability is cost, there is certain contradiction between high strength, toughness and welding property.Cr, No, Ni, as bainite forming element, are used for suppressing ferrite one perlitic transformation of steel, thus facilitate bainite type change by forming carbide or stable austenite etc.B by Grain Boundary Segregation, forms the metal boride of hexagonal structure at grain boundaries thus inhibits and first analyse ferritic formation, making to obtain stable bainite types of tissue within the scope of wider cooling rate.Because B is that velocity of diffusion is much larger than interstitial atom in austenite for interstitial atom, thus a small amount of B just can reach the effect of the elements such as Cr, Mo, Ni.The prerequisite that will play the effect improving hardening capacity due to B element in the steel plate of TMCP explained hereafter suppresses the C in B and steel to form Fe
23(C, B)
6, and to make at generation austenite, to B segregation on crystal boundary before ferritic transformation, therefore must contain a certain amount of carbide, suppress Fe with this
23(C, B)
6generation, and Carbide Precipitation temperature must higher than austenite to ferrite transformation temperature.Boron atomic radius is less, easily produces segregation at crystal boundary; The B of denier just can significantly improve the hardening capacity of steel.Boracic low-carbon bainite steel air cooling is organized as granular bainite and adds a small amount of ferrite and perlite, the difference of Heating temperature, and after its phase transformation, structure refinement degree is different, and Heating temperature height structure refinement degree is poor.
For containing B high-strength steel, how to give full play to the effect of micro-B in steel, do not adding armor plate strength and the favourable element of toughness, as under the element conditions such as Mo, Ni, by means of only TMCP explained hereafter thick steel plates, there is some problems in the coupling of its intensity, impelling strength.
Contrast patent 1: a kind of 550 Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof (application number: CN102162065A), adopt C:0.05 ~ 0.10%, Si:0.20 ~ 0.50%, Mn:1.50 ~ 1.80%, S≤0.010%, P≤0.018%, Nb≤0.10%, Mo≤0.10%, Ti:0.010 ~ 0.040%, B:0.0010 ~ 0.0030%, Cr:0.20 ~ 0.50%, Al:0.015 ~ 0.050%, by adjustment member constituent content, microalloy treatment, TMCP explained hereafter, controlled rolling and water-cooled, do not need thermal treatment, produce that to have intensity high, the bainite steel for engineering machinery that low-temperature flexibility is good.This patent adds the alloying elements such as a certain amount of Mo, Cr by employing, and strictly controls steelmaking process, requires comparatively harsh to steelmaking process; Simultaneously in this patent Example, steel plate maximum ga(u)ge only 30mm, and its tensile strength scope is between 600MPa-700MPa, similar with Q460 rank steel grade.
The contrast strong hull of superelevation of patent 2: yield strength 550Mpa and offshore platform steel and production method (application number: CN102400063A) thereof, adopt 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%, Als0.015 ~ 0.045%, adopt two-stage control rolling and controlled cooling model, obtain lath-shaped bainite and ferritic structure, the requirement of national standard FH550 grade of steel can be met.This patent adopts more alloying elements cr, Ni, Mo, Cu, while cost increases, also increases the difficulty of steel billet smelting process; In the operation of rolling, cumulative deformation in two-phase control rolling process all be there are certain requirements, increase mill load, reduce production efficiency.
Summary of the invention
The object of the present invention is to provide a kind of micro-boron process tensile strength 700MPa level Wide and Thick Slab and manufacture method, solve think gauge containing B high tensile steel plate undercapacity, impact unstable problem.
In conjunction with existing tooling device advantage and strict technical process control, appropriate design TMCP state yield strength tensile strength 700MPa grade high-strength structure iron component system, adopt low C, high Mn, trace element B, and suitably add microalloy element Nb, V, Ti, under the prerequisite of not adding any precious alloy Ni, Mo, Cr, Cu, by TMCP technique, successfully develop tensile strength 700MPa level thickness specification 30mm-80mm High Strength Structural Steel.
A kind of micro-boron process tensile strength 700MPa level Wide and Thick Slab, its by weight percentage chemical composition be, 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%; All the other are Fe and inevitable impurity.Carbon equivalent Ceq (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni/+Cu)/15, and Ceq scope: 0.43 ~ 0.48%.
Mn is important obdurability element, mainly plays solution strengthening effect, and in suitable scope, the intensity of steel improves along with the increase of Mn content, and brittle transition temperature declines simultaneously, contributes to the refinement realizing bainite Effective grain size.B can improve the hardening capacity of steel, plays a part to strengthen crystal boundary, but B too high levels, unfavorable to toughness; Meanwhile, B is easily combined with N, slackens the effect of B in steel, therefore adds a certain amount of solid N element Ti in this patent, and does strict control to N content; Propose strict requirement to harmful element content, regulation P≤0.012%, S≤0.005%, to improve the purity of steel, improve the plasticity of steel, toughness simultaneously. property, weldability etc.
A manufacture method for micro-boron process tensile strength 700MPa level Wide and Thick Slab, adopt normal smelting and slab production method, its operation is as follows: desulfurizing iron skims → converter smelting → LF stove refining → RH vacuum-treat → slab casting → steel plate rolling and cooling.
Concrete steps and parameter as follows:
1, in smelting process, strictly 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 that carbon equivalent Ceq is in 0.43 ~ 0.48% scope; Add the Ti of 0.015% ~ 0.025%, to ensure Ti/N > 4.0, N, makes the micro-B of interpolation fully admittedly, at utmost exists with solid solution state form, to improve the effect of B in rolling and Cooling Process.
2, heating of plate blank: adopt walking beam heating furnace by between heating of plate blank to design temperature 1160 DEG C ~ 1220 DEG C, and control each heating zone temperature between 950 DEG C ~ 1260 DEG C, slab time inside furnace is 220min ~ 360min, ensures the abundant austenitizing of slab.
3, steel plate rolling and cooling: in the operation of rolling, adopts two-phase control rolling (recrystallization zone and the rolling of non-recrystallization zone) and controlled cooling model (ACC section cooling); Rolling end temp in recrystallization zone is 950 DEG C ~ 1000 DEG C; Steel plate treats that temperature thickness sets by 2 ~ 4 times of finished steel plate thickness; It is 860 DEG C ~ 920 DEG C that the rolling of non-recrystallization zone starts temperature, and its end temp is between 780 DEG C ~ 800 DEG C.Enter cooling facility for laminar flow after steel plate rolling fast to cool; Steel plate enters water temp by 750 DEG C ~ 780 DEG C controls, and final cooling temperature is by 450 DEG C ~ 500 DEG C controls, and cooling rate sets by 15 DEG C/S ~ 25 DEG C/S.After water-cooled completes, steel plate rolls off the production line cooling in heap fast, cooling in heap temperature 350 DEG C ~ 500 DEG C, and cooling in heap time controling, at 48h-72h, to reach self-tempering object, reduces steel plate internal stress simultaneously.
4, according to steel plate thickness specification, choose reasonable continuously cast bloom specification; For 30mm < steel plate thickness≤50mm, select 300mm think gauge continuously cast bloom; For " 50mm < steel plate thickness≤80mm ", select 400mm think gauge continuously cast bloom, fully to ensure in the operation of rolling cumulative deformation in reduction in pass and two-phase control rolling process.Ensure recrystallization zone rolling sequence cumulative deformation >=60%, last percentage pass reduction >=15% of recrystallization zone rolling; Non-recrystallization zone rolling sequence cumulative deformation 50% ~ 75%, last reduction in pass of non-recrystallization zone rolling at 1.0mm ~ 3.0mm, to ensure internal quality of steel plate, external mass and comprehensive mechanical property.
By above technical process, micro-boron process of producing, TMCP state, tensile strength 700MPa level Wide and Thick Slab stable mechanical property, have good intensity, plasticity, toughness, and have excellent welding property.
The every mechanical performance index of Wide and Thick Slab: 560MPa≤Rp0.2 (yield strength)≤620MPa, 700MPa≤Rm (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-AKv (-40 DEG C of impact values)≤200J, steel plate thickness specification 30mm ~ 80mm.
The invention has the advantages that: alloy designs is relatively more reasonable, and cost of alloy is low; Without the need to tempering or modifier treatment, control by means of only Rational Composition design and rolling, Cooling Process, Absorbable organic halogens produces high-strength thick-specification, and has good impact toughness thick steel plates.
Accompanying drawing explanation
Fig. 1 is that in embodiment 1,30mm specification steel plate rolls state metallographic structure.
Fig. 2 is that in embodiment 2,80mm specification steel plate rolls state metallographic structure.
Embodiment
Embodiment 1
A kind of micro-boron process tensile strength 700MPa level Wide and Thick Slab and manufacture method, learn component requirements in table 1, 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, 2 scale rollings) is completed at 4300mm Heavy Plate Rolling Line
Table 1 embodiment 1 chemical composition (wt%)
| C | Si | Mn | P | S | Alt | V | Nb | Ti | B | N | Ceq | Ti/N ratio |
| 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 is arranged in table 2.
Table 2 embodiment 1 rolling technological parameter is arranged
Note: thickness unit-mm; Temperature unit-DEG C; Speed of cooling-DEG C/S
Recrystallization zone rolling sequence cumulative deformation 65%, last percentage pass reduction 20% of recrystallization zone rolling, non-recrystallization zone rolling sequence cumulative deformation is 71%, and rolling last reduction in pass in non-recrystallization zone is at 1.8mm.The every mechanical property of embodiment 1 steel plate is as shown in table 3.
The every mechanical property of table 3 embodiment 1 steel plate
Embodiment 2
A kind of micro-boron process tensile strength 700MPa level Wide and Thick Slab and manufacture method, chemical composition will ask for an interview to table 4, 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, 1 scale rolling) is completed at 4300mm Heavy Plate Rolling Line
Table 4 embodiment 2 chemical composition (wt%)
| C | Si | Mn | P | S | Alt | V | Nb | Ti | B | N | Ceq | Ti/N ratio |
| 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 |
Embodiment 2 rolling technological parameter is arranged in table 5.
Table 5 rolling technological parameter is arranged
Note: thickness unit-mm; Temperature unit-DEG C; Speed of cooling-DEG C/S
Recrystallization zone rolling sequence cumulative deformation 60%, last percentage pass reduction 19% of recrystallization zone rolling, non-recrystallization zone rolling sequence cumulative deformation is 50%, and rolling last reduction in pass in non-recrystallization zone is at 2.0mm.The every mechanical property of embodiment 2 steel plate is as shown in table 6.
The every mechanical property of table 6 steel plate
Claims (6)
1. a micro-boron process tensile strength 700MPa level Wide and Thick Slab, it is characterized in that, chemical composition is by weight percentage, 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%; All the other are Fe and inevitable impurity.
2. Wide and Thick Slab according to claim 1, is characterized in that, carbon equivalent scope is 0.43 ~ 0.48wt%.
3. a manufacture method for Wide and Thick Slab described in claim 1, operation is as follows: desulfurizing iron skims → converter smelting → LF stove refining → RH vacuum-treat → slab casting → steel plate rolling and cooling; It is characterized in that, step and parameter 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 that carbon equivalent Ceq is in 0.43 ~ 0.48% scope; Add the Ti of 0.015% ~ 0.025%, to ensure Ti/N > 4.0;
2) heating of plate blank: adopt walking beam heating furnace by between heating of plate blank to design temperature 1160 DEG C ~ 1220 DEG C, and control each heating zone temperature between 950 DEG C ~ 1260 DEG C, slab time inside furnace is 220min ~ 360min, ensures the abundant austenitizing of slab;
3) steel plate rolling and cooling: in the operation of rolling, adopts two-phase control rolling and controlled cooling model; Rolling end temp in recrystallization zone is 950 DEG C ~ 1000 DEG C; Steel plate treats that temperature thickness sets by 2 ~ 4 times of finished steel plate thickness; It is 860 DEG C ~ 920 DEG C that the rolling of non-recrystallization zone starts temperature, and its end temp is between 780 DEG C ~ 800 DEG C; Enter cooling facility for laminar flow after steel plate rolling to cool; Steel plate enters water temp by 750 DEG C ~ 780 DEG C controls, and final cooling temperature is by 450 DEG C ~ 500 DEG C controls, and cooling rate sets by 15 DEG C/S ~ 25 DEG C/S; After water-cooled completes, steel plate rolls off the production line cooling in heap, cooling in heap temperature 350 DEG C ~ 500 DEG C, and cooling in heap time controling, at 48h-72h, to reach self-tempering object, reduces steel plate internal stress simultaneously;
4) for 30mm < steel plate thickness≤50mm, 300mm think gauge continuously cast bloom is selected; For 50mm < steel plate thickness≤80mm, select 400mm think gauge continuously cast bloom, fully to ensure in the operation of rolling cumulative deformation in reduction in pass and two-phase control rolling process.
4. method according to claim 3, is characterized in that, step 3) described in two-phase control rolling be recrystallization zone and the rolling of non-recrystallization zone; Controlled cooling model is ACC section cooling.
5. method according to claim 3, is characterized in that, step 4) middle guarantee recrystallization zone rolling sequence cumulative deformation >=60%, last percentage pass reduction >=15% of recrystallization zone rolling; Non-recrystallization zone rolling sequence cumulative deformation is 50% ~ 75%, and rolling last reduction in pass in non-recrystallization zone is at 1.0mm ~ 3.0mm.
6. method according to claim 3, it is characterized in that, the every mechanical performance index of Wide and Thick Slab manufactured: 560MPa≤yield strength≤620MPa, 700MPa≤tensile strength≤800MPa, 16.0%≤elongation after fracture≤22.0%, DEG C impact value≤250J, 100J≤-40,180J≤-20 DEG C impact value≤200J, steel plate thickness specification 30mm ~ 80mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106637208A (en) * | 2016-09-23 | 2017-05-10 | 广东康业电器有限公司 | Production process for A3 steel plate enamel piece |
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| CN106637208A (en) * | 2016-09-23 | 2017-05-10 | 广东康业电器有限公司 | Production process for A3 steel plate enamel piece |
| CN109487063A (en) * | 2018-12-21 | 2019-03-19 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process of Ti-V-N combined microalloying nano-particle reinforcement mild steel |
| 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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| CN105543680B (en) | 2018-01-05 |
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