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 PDF

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Publication number
CN105543680B
CN105543680B CN201510967102.5A CN201510967102A CN105543680B CN 105543680 B CN105543680 B CN 105543680B CN 201510967102 A CN201510967102 A CN 201510967102A CN 105543680 B CN105543680 B CN 105543680B
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steel plate
rolling
temperature
control
cooling
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CN105543680A (en
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宋欣
谌铁强
黄少帅
白松莲
王坤
张学峰
刘永利
闫智平
田士平
刘海龙
周德光
赵久梁
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Shougang Jingtang United Iron and Steel Co Ltd
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Qinhuangdao Shouqin Metal Materials Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236Cold rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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

Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method
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.
CN201510967102.5A 2015-12-21 2015-12-21 Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method Expired - Fee Related CN105543680B (en)

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CN104947000A (en) * 2015-06-14 2015-09-30 秦皇岛首秦金属材料有限公司 High-strength steel with yield strength of 700MPa and TMCP manufacturing method

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