CN109321830A - High-carbon steel plate with high ductility and toughness and high flatness and manufacturing method thereof - Google Patents
High-carbon steel plate with high ductility and toughness and high flatness and manufacturing method thereof Download PDFInfo
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- CN109321830A CN109321830A CN201811343764.5A CN201811343764A CN109321830A CN 109321830 A CN109321830 A CN 109321830A CN 201811343764 A CN201811343764 A CN 201811343764A CN 109321830 A CN109321830 A CN 109321830A
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- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 238000010583 slow cooling Methods 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 241001062472 Stokellia anisodon Species 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 229910001562 pearlite Inorganic materials 0.000 abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 17
- 239000010959 steel Substances 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 10
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000007600 charging Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 abstract 1
- 229910001566 austenite Inorganic materials 0.000 description 23
- 230000007704 transition Effects 0.000 description 12
- 230000009466 transformation Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 241000446313 Lamella Species 0.000 description 6
- 238000005452 bending Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000004781 supercooling Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 235000019362 perlite Nutrition 0.000 description 5
- 239000010451 perlite Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 241000186216 Corynebacterium Species 0.000 description 3
- 238000009933 burial Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000699 SAE 1074 Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to the technical field of steel production, and particularly relates to a high-carbon steel plate with high ductility and toughness and high flatness and a manufacturing method thereof. The invention relates to a method for manufacturing a high-carbon steel plate with high ductility and toughness and high flatness, which comprises the following steps: smelting, refining, continuous casting, plate blank lower line slow cooling, hot charging and hot feeding, rough rolling, finish rolling, laminar cooling, steel coil slow cooling, coiling and transverse cutting and flattening. Different from the prior high-carbon steel hot-rolled strip steel production technology, the invention adopts controlled rolling and controlled cooling processes to produce the high-carbon steel hot-rolled strip steel, and a microstructure with fine and thin lamellar pearlite and degenerated pearlite distributed in a matching way is formed on the microstructure. Compared with the existing products, the high-carbon steel plate with high ductility and toughness and high flatness of the invention has lower hardness, higher ductility and toughness and better flatness.
Description
Technical field
The invention belongs to the high carbon steel sheet of technical field of steel production more particularly to a kind of high-plasticity and high straightness and
Its manufacturing method.
Background technique
High-carbon steel is widely used on tool due to hardness and wearability with higher after quenching, especially
It is that nearly eutectoid point steel is most commonly seen, such as 75#, T8 in national standard, in SK6 in day mark, the SAE1074, Europe superscript in American Standard
CK75 and 75Cr1 etc., the above high-carbon steel are commonly applied on the hardware tools such as cutter, saw blade, saw blade.This kind of nearly eutectoid point is high
The carbon content of carbon steel is high, and plasticity is very low with toughness, is easy to happen fracture when in use.In addition, this kind of high-carbon steel was producing
The non-uniform problem of stress distribution is easy to happen in journey, subsequent difficulty of processing is larger, opens the straightness after putting down and is difficult to ensure.For
Solving the problems, such as that hardness is high, plasticity and toughness are low, straightness is difficult to ensure, traditional handicraft is often produced using higher coiling temperature,
To reduce the hardness of steel plate, or even nodularization or soft annealing are carried out after having produced, then open and put down to guarantee making for steel plate again
With performance and straightness.
Therefore, the hardness of nearly eutectoid point high-carbon steel how is reduced using single hot rolling technology, improves plasticity and toughness, is improved
Processing performance and straightness are always problem to be solved in high-carbon steel hot rolling production process.
Summary of the invention
The purpose of the present invention is to provide the high carbon steel sheets and its manufacturing method of a kind of high-plasticity and high straightness, it is intended to
Solve the problems, such as that existing nearly eutectoid point high carbon steel sheet plasticity and toughness are lower, straightness is poor.
For achieving the above object, The technical solution adopted by the invention is as follows:
One aspect of the present invention provides the high carbon steel sheet of a kind of high-plasticity and high straightness, including following chemical composition and
Its weight percent amount are as follows: C:0.7%~0.8%, Si≤0.50%, Mn≤1.0%, P≤0.025%, S≤0.010%, Al≤
0.06%, Ti≤0.01%, N≤0.006%；The high carbon steel sheet of the high-plasticity and high straightness with a thickness of 1.6mm
15mm；It is prepared by the following steps to obtain:
Smelt --- refining --- continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling ---
--- it is flat that cross section --- is batched --- in coil of strip slow cooling to section cooling；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed controls the temperature of slab slow cooling, plate
Base slow cooling is to 700 DEG C or less progress hot-loading and hot-conveyings；Setting section cooling is the sparse cooling of full section, and the drafts for adjusting roughing is
80%~85%, finishing temperature be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).
Preferably, the temperature batched is 600~650 DEG C.
Preferably, the offline 2~8h of slow cooling of the slab.
Preferably, slab slow cooling is to 300~700 DEG C.
Preferably, the hot-loading and hot-conveying includes that slab enters heating stove heating, heating temperature 1150 at 300~700 DEG C
~1250 DEG C.
Another aspect of the present invention provides a kind of manufacturing method of the high carbon steel sheet of high-plasticity and high straightness, including with
Lower step:
Smelt --- refining --- continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling ---
--- it is flat that cross section --- is batched --- in coil of strip slow cooling to section cooling；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed, the control offline slow cooling of slab to 300~700
DEG C carry out hot-loading and hot-conveying, setting section cooling be the sparse cooling of full section, and adjust roughing drafts be 80%~85%, finish to gauge
Temperature be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).
Preferably, the drafts of the roughing is 80%~83%, and finishing temperature is 890~940 DEG C.
Preferably, the offline 2~8h of slow cooling of the slab.
Preferably, the hot-loading and hot-conveying includes that slab enters heating stove heating, heating temperature 1150 at 300~700 DEG C
~1250 DEG C.
Compared with the prior art, the invention has the following advantages: slab of the present invention is by offline carry out slow cooling,
Tissue is undergone phase transition in this process in slab, is α phase by γ phase transition, the austenite grain after refining heating of plate blank；Roughing work
The drafts that roughing is adjusted in sequence is 80%~85%, and finishing temperature is 850~950 DEG C, and roughing uses the big pressure of high temperature, to plate
Base carries out the controlled rolling of austenite recrystallization area, further fining austenite grains, and finishing temperature is set as 850~950 DEG C, austenite
It can sufficiently recrystallize, and the rolling load in industrial production can be reduced；In laminar cooling process, the high-plasticity and Gao Ping
The high carbon steel sheet directly spent uses the sparse cooling of full section, reduces cooling stress, while improving cooling uniformity；Coiling temperature setting
For 550 DEG C~(Ar1-20 DEG C), strip undergoes phase transition before batching and after batching, and forms tiny dilute lamella pearlite and moves back
The microscopic structure for changing pearlite collocation distribution, reduces hardness, improves plasticity and toughness.
Coiling temperature of the present invention is set as 550 DEG C or more, and (Ar1-20 DEG C) is hereinafter, austenite is to pearly-lustre when Ar1 is cooling
The start temperature of body transformation, (Ar1-20 DEG C) subtracts 20 DEG C for Ar1.Strip is undergone phase transition before batching, the strip on roller-way into
When entering Ar1 temperature or less, starting phase transformation, pearlite is first nucleated and grows up in austenite grain boundary at this time, because degree of supercooling is very small,
So cemetite lamellae interlamellar spacing is very big, dilute sheet feature is presented, hardness is lower；And strip enter lower temperature when, not
The austenite for being in time for phase transformation will form pearlite at lower temperatures, at this time because degree of supercooling is larger, the carbon in pearlite
Compound is easy to be degenerated to corynebacterium, further decreases hardness and improves plasticity and toughness.What is produced under this process condition is described high-plastic
The high carbon steel sheet of toughness and high straightness, compared to prior art, plasticity and toughness are higher, and it is high to open the straightness after putting down.
The present invention passes through the technological parameter of controlled rolling and the offline slow cooling of slab, refines the austenite grain in slab, shape
At the microscopic structure of tiny dilute lamella pearlite and degenerate perlite collocation distribution, and pass through the sparse cooling drop of full section after rolling
Low internal stress reduces manufacturing cost, improves lumber recovery.
The high carbon steel sheet of high-plasticity and high straightness of the present invention, compared to existing high carbon steel sheet, hardness compared with
Low, plasticity and toughness are higher, and straightness is higher, and hardness is 19~24HRC, and yield strength is 420~550MPa, tensile strength 750
~850MPa, elongation after fracture are 12.0%~18.0%；120 ° of diameter 50mm elbow bending is not broken；20 DEG C of non-standard specimen punchings
It hits, being converted into standard impulse function is 5.0~7.0J, and fracture skill facet is tiny；Open flatness value≤8mm/ on flat rear any direction
m.The high carbon steel sheet of high-plasticity and high straightness of the present invention will not crack during opening flat because being bent or impacting,
Brittle failure, while the steel plate injustice angle value opened after putting down is low, lumber recovery improves 3% or more compared with the prior art.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain
The present invention is not intended to limit the present invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
One aspect of the present invention proposes the high carbon steel sheet of a kind of high-plasticity and high straightness, specifically, the present invention is implemented
In mode, a kind of high carbon steel sheet of high-plasticity and high straightness, including following chemical composition and its weight percent amount are as follows: C:
0.7%~0.8%, Si≤0.50%, Mn≤1.0%, P≤0.025%, S≤0.010%, Al≤0.06%, Ti≤
0.01%, the high carbon steel sheet of N≤0.006%, the high-plasticity and high straightness with a thickness of 1.6mm~15mm；
The high carbon steel sheet of the high-plasticity and high straightness is prepared by the following steps to obtain: smelting --- refining ---
Continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling --- section cooling --- coil of strip slow cooling ---
Batching --- cross section is flat；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed controls the temperature of slab slow cooling, plate
Base slow cooling is to 700 DEG C or less progress hot-loading and hot-conveyings；Setting section cooling is the sparse cooling of full section, and the drafts for adjusting roughing is
80%~85%, finishing temperature be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).
In embodiment of the present invention, the content of C are as follows: 0.7%~0.8%.
In embodiment of the present invention, slab is organized to undergo phase transition in this process, by γ by offline carry out slow cooling in slab
Phase transition is α phase, the austenite grain after refining heating of plate blank；In roughing operation adjust roughing drafts be 80%~
85%, finishing temperature is 850~950 DEG C, and roughing uses the big pressure of high temperature, carries out the controlled rolling of austenite recrystallization area to slab, into
Step refining austenite grain, finishing temperature are set as 850~950 DEG C, and austenite can be recrystallized sufficiently, and can reduce industry
Rolling load in production；In laminar cooling process, the high carbon steel sheet of the high-plasticity and high straightness is sparse using full section
It is cooling, cooling stress is reduced, while improving cooling uniformity；Coiling temperature be set as 550 DEG C~(Ar1-20 DEG C), strip exists
It is undergone phase transition before batching and after batching, forms micro- group of tiny dilute lamella pearlite and degenerate perlite collocation distribution
It knits, reduces hardness, improve plasticity and toughness.The technique that embodiment of the present invention passes through controlled rolling and the offline slow cooling of slab
Parameter refines the austenite grain in slab, form tiny dilute lamella pearlite and degenerate perlite collocation be distributed it is micro-
Tissue, and by the sparse cooling reduction internal stress of full section after rolling, manufacturing cost is reduced, lumber recovery is improved.
Coiling temperature described in embodiment of the present invention is set as 550 DEG C or more, and (Ar1-20 DEG C) is hereinafter, when Ar1 is cooling
For austenite to the start temperature of perlitic transformation, (Ar1-20 DEG C) subtracts 20 DEG C for Ar1.Strip is undergone phase transition before batching, roller
When strip on road enters Ar1 temperature or less, starting phase transformation, pearlite is first nucleated and grows up in austenite grain boundary at this time, because
Degree of supercooling is very small, so cemetite lamellae interlamellar spacing is very big, dilute sheet feature is presented, hardness is lower；And strip enters more
When low temperature, the austenite for having not enough time to phase transformation will form pearlite at lower temperatures, at this time because degree of supercooling is larger,
Carbide in pearlite is easy to be degenerated to corynebacterium, further decreases hardness and improves plasticity and toughness.It gives birth under this process condition
The high carbon steel sheet of the high-plasticity and high straightness that produce, compared to prior art, plasticity and toughness are higher, open the straightness after putting down
It is high.
The high carbon steel sheet of the high-plasticity and high straightness described in embodiment of the present invention, compared to existing high-carbon
Steel plate, hardness is lower, and plasticity and toughness are higher, and straightness is higher, and hardness is 19~24HRC, and yield strength is 420~550MPa,
750~850MPa of tensile strength, elongation after fracture are 12.0%~18.0%；120 ° of diameter 50mm elbow bending is not broken；20
DEG C non-standard specimen impact, being converted into standard impulse function is 5.0~7.0J, and fracture skill facet is tiny；It opens straight on flat rear any direction
Angle value≤8mm/m.The high carbon steel sheet of the high-plasticity and high straightness described in embodiment of the present invention is during opening flat
It will not crack because being bent or impacting, brittle failure, while the steel plate injustice angle value opened after putting down is low, lumber recovery mentions compared with the prior art
It is high by 3% or more.
In as a preferred embodiment of the present invention, the temperature batched is 600~650 DEG C.
In as a preferred embodiment of the present invention, the offline 2~8h of slow cooling of slab.
In as a preferred embodiment of the present invention, slab slow cooling is to 300~700 DEG C.
In as a preferred embodiment of the present invention, the hot-loading and hot-conveying includes that slab enters heating at 300~700 DEG C
Stove heating, heating temperature are 1150~1250 DEG C.
In the respective embodiments described above of the present invention, institute in the preparation process of the high carbon steel sheet of the high-plasticity and high straightness
The equipment needed, is common production equipment in steel and iron manufacturing technique, roughing work set by the respective embodiments described above of the present invention
Coil of strip slow cooling after the cold mode of skill parameter, finishing temperature, coiling temperature, layer, and rolling, it is easy to accomplish, it is described high-plastic tough
Property and high straightness high carbon steel sheet preparation method strong operability, practical value is high, the high-plasticity of production and high
The high carbon steel sheet of straightness with a thickness of 1.6mm~15.0mm, preferably high carbon steel sheet with a thickness of 4mm, 5mm, 6mm, 8mm,
10mm, 12mm or 14mm.
It can also include following chemical composition, one of Ni, Cr, Mo, Ca or V in the respective embodiments described above of the present invention
Or it is two or more；According to the high-plasticity of required production and the high carbon steel sheet of high straightness, it can choose and above-mentioned member is added
One or more of element.
Another aspect of the present invention proposes a kind of manufacturing method of the high carbon steel sheet of high-plasticity and high straightness, including with
Lower step:
Smelt --- refining --- continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling ---
--- it is flat that cross section --- is batched --- in coil of strip slow cooling to section cooling；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed, the adjustment offline slow cooling of slab to 300~700
DEG C carry out hot-loading and hot-conveying, setting section cooling be the sparse cooling of full section, and adjust roughing drafts be 80%~85%, finish to gauge
Temperature be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).Preferably, the drafts of the roughing be 80%~
83%, finishing temperature is 890~940 DEG C, and coiling temperature is 600~650 DEG C.
In embodiment of the present invention, slab is organized to undergo phase transition in this process, by γ by offline carry out slow cooling in slab
Phase transition is α phase, the austenite grain after refining heating of plate blank；In roughing operation adjust roughing drafts be 80%~
85%, finishing temperature is 850~950 DEG C, and roughing uses the big pressure of high temperature, carries out the controlled rolling of austenite recrystallization area to slab, into
Step refining austenite grain, finishing temperature are set as 850~950 DEG C, and austenite can be recrystallized sufficiently, and can reduce industry
Rolling load in production；In laminar cooling process, the high carbon steel sheet of the high-plasticity and high straightness is sparse using full section
It is cooling, cooling stress is reduced, while improving cooling uniformity；Coiling temperature be set as 550 DEG C~(Ar1-20 DEG C), strip exists
It is undergone phase transition before batching and after batching, forms micro- group of tiny dilute lamella pearlite and degenerate perlite collocation distribution
It knits, reduces hardness, improve plasticity and toughness.The technique that embodiment of the present invention passes through controlled rolling and the offline slow cooling of slab
Parameter refines the austenite grain in slab, form tiny dilute lamella pearlite and degenerate perlite collocation be distributed it is micro-
Tissue, and by the sparse cooling reduction internal stress of full section after rolling, manufacturing cost is reduced, lumber recovery is improved.
Using the manufacturing method of high-plasticity described in embodiment of the present invention and the high carbon steel sheet of high straightness, the height of preparation
The high carbon steel sheet of plasticity and toughness and high straightness, compared to existing high carbon steel sheet, hardness is lower, and plasticity and toughness are higher, straightness compared with
Height, hardness are 19~24HRC, and yield strength is 420~550MPa, 750~850MPa of tensile strength, and elongation after fracture is
12.0%~18.0%；120 ° of diameter 50mm elbow bending is not broken；20 DEG C of non-standard specimen impacts, being converted into standard impulse function is
5.0~7.0J, fracture skill facet are tiny；Open flatness value≤8mm/m on flat rear any direction.High-plasticity of the present invention
It will not crack because being bent or impacting during opening flat with the high carbon steel sheet of high straightness, brittle failure, while open the steel plate after putting down
Uneven angle value is low, and lumber recovery improves 3% or more compared with the prior art.
In as a preferred embodiment of the present invention, the coiling temperature batched is 600~650 DEG C.The band before batching
Steel is undergone phase transition, when the strip on roller-way enters Ar1 temperature or less, start phase transformation, at this time pearlite first austenite grain boundary at
Core is simultaneously grown up, because degree of supercooling is very small, cemetite lamellae interlamellar spacing is very big, and dilute sheet feature is presented, and hardness is lower；
And strip enter lower temperature when, the austenite for having not enough time to phase transformation will form pearlite at lower temperatures, at this time because
Larger for degree of supercooling, the carbide in pearlite is easy to be degenerated to corynebacterium, further decreases hardness and improves plasticity and toughness.Herein
The high carbon steel sheet of the high-plasticity and high straightness that produce under process conditions, compared to prior art, plasticity and toughness are higher, open after putting down
Straightness it is high.
In as a preferred embodiment of the present invention, the offline 2~8h of slow cooling of slab.
In as a preferred embodiment of the present invention, slab slow cooling is to 300~700 DEG C.
In as a preferred embodiment of the present invention, the hot-loading and hot-conveying includes that slab enters heating at 300~700 DEG C
Stove heating, heating temperature are 1150~1250 DEG C.
In the respective embodiments described above of the present invention, institute in the manufacturing method of the high carbon steel sheet of the high-plasticity and high straightness
The equipment needed, is common production equipment in steel and iron manufacturing technique, roughing work set by the respective embodiments described above of the present invention
Coil of strip slow cooling after the cold mode of skill parameter, finishing temperature, coiling temperature, layer, and rolling, it is easy to accomplish, it is described high-plastic tough
Property and high straightness high carbon steel sheet preparation method strong operability, practical value is high, the high-plasticity of production and high
The high carbon steel sheet of straightness with a thickness of 1.6mm~15.0mm, preferably high carbon steel sheet with a thickness of 4mm, 5mm, 6mm, 8mm,
10mm, 12mm or 14mm.
It is illustrated combined with specific embodiments below.
Embodiment 1
A kind of high-plasticity and high straightness high carbon steel sheet, including following chemical composition and its weight percent amount are as follows: C
0.752%, Si 0.213%, Mn 0.645%, P 0.0143%, S 0.004%, Cr 0.387%, Alt 0.0195%, Ca
0.0011%, remaining is Fe and inevitable impurity.
Molten steel is refined through 210 tons of converter smeltings, then through LF furnace, pours into slab in 2150mm slab caster, slab is thick
Degree is 230mm, out offline 2~8h of slow cooling after conticaster, and board briquette is at 700 DEG C or less at this time.Slab is carried out at 300 DEG C or more
Hot charging carries out roughing and finish rolling in 2250mm hot continuous rolling production line, and slab heating temperature is 1210 DEG C, and roughing drafts is
80.3%, workpiece thickness 45.2mm, finishing temperature are 890 DEG C, target thickness 4mm；Strip is dilute through laminar flow full section after rolling
It dredges and is cooled to 630 DEG C of target coiling temperature, coil of strip is batched rear air-cooled and quickly carried out into burial pit slow cooling.It is cooled to coil of strip temperature
After 20~35 DEG C, coil of strip is carried out out in traverse flat.
According to the high-plasticity of above manufacturing method production and the high carbon steel sheet of high straightness, yield strength is
485MPa, tensile strength 820MPa, elongation after fracture reach 14%；120 ° of diameter 50mm elbow bending is not broken；20 DEG C non-
Standard specimen impact, is converted into standard impulse function 6.3J, fracture skill facet is tiny；Open flatness value≤8mm/m on flat rear any direction.
Embodiment 2
A kind of high carbon steel sheet of high-plasticity and high straightness, including following chemical composition and its weight percent amount are as follows: C
0.786%, Si 0.197%, Mn 0.353%, P 0.0126%, S 0.004%, Cr 0.144%, Alt 0.0165%, Ca
0.0013%, remaining is Fe and inevitable impurity.
Molten steel is refined through 210 tons of converter smeltings, then through LF furnace, pours into slab in 2150mm slab caster, slab is thick
Degree is 230mm, out offline 2~8h of slow cooling after conticaster, and board briquette is at 700 DEG C or less at this time.Slab is in 300 DEG C or more warm
Dress carries out roughing and finish rolling in 2250mm hot continuous rolling production line, and slab heating temperature is 1190 DEG C, and roughing drafts is
82.1%, workpiece thickness 41.1mm, finishing temperature are 890 DEG C, target thickness 5mm；Strip is dilute through laminar flow full section after rolling
It dredges and is cooled to 620 DEG C of target coiling temperature, coil of strip is batched rear air-cooled and quickly carried out into burial pit slow cooling.It is cooled to coil of strip temperature
After 20~35 DEG C, coil of strip is carried out out in traverse flat.
According to the high-plasticity of above manufacturing method production and the high carbon steel sheet of high straightness, yield strength is
460MPa, tensile strength 770MPa, elongation after fracture reach 15.5%；120 ° of diameter 50mm elbow bending is not broken；20℃
Non- standard specimen impact, is converted into standard impulse function 5.4J, fracture skill facet is tiny；Open flatness value≤8mm/ on flat rear any direction
m。
Embodiment 3
A kind of high carbon steel sheet of high-plasticity and high straightness, including following chemical composition and its weight percent amount are as follows: C
0.758%, Si 0.158%, Mn 0.710%, P 0.0136%, S 0.003%, Alt 0.0207%, Ca 0.0009%,
Remaining is Fe and inevitable impurity.
Molten steel is refined through 210 tons of converter smeltings, then through LF furnace, pours into slab in 2150mm slab caster, slab is thick
Degree is 230mm, out offline 2~8h of slow cooling after conticaster, and temperature is at 700 DEG C or less at this time.Slab in 300 DEG C or more hot chargings,
2250mm conventional hot continuous rolling machine production line is rolled, and slab heating temperature is 1210 DEG C, and roughing drafts is 81.6%, intermediate base
With a thickness of 42.3mm, finishing temperature is 890 DEG C, target thickness 6mm, and strip through laminar flow full section is sparse is cooled to target volume after rolling
620 DEG C of temperature are taken, coil of strip is batched rear air-cooled and quickly carried out into burial pit slow cooling.It, will after coil of strip temperature is cooled to 20~35 DEG C
Coil of strip carries out out flat in traverse.
According to the high-plasticity of above manufacturing method production and the high carbon steel sheet of high straightness, yield strength is
445MPa, tensile strength 840MPa, elongation after fracture reach 13.5%；120 ° of diameter 50mm elbow bending is not broken；20℃
Non- standard specimen impact, is converted into standard impulse function 5.8J, fracture skill facet is tiny；Open flatness value≤8mm/ on flat rear any direction
m。
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. the high carbon steel sheet of a kind of high-plasticity and high straightness, which is characterized in that including following chemical composition and its weight hundred
Component are as follows: C:0.7%~0.8%, Si≤0.50%, Mn≤1.0%, P≤0.025%, S≤0.010%, Al≤0.06%,
Ti≤0.01%, N≤0.006%, can be added as needed suitable Ni, Cr, Mo, V, surplus Fe, the high-plasticity with
The high carbon steel sheet of high straightness with a thickness of 1.6mm 15mm；The high carbon steel sheet of the high-plasticity and high straightness, by following
Step is prepared:
Smelt --- refining --- continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling --- laminar flow
It is cooling that --- it is flat that cross section --- is batched --- in coil of strip slow cooling；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed adjusts the temperature of slab slow cooling, and slab slow cooling is extremely
700 DEG C or less progress hot-loading and hot-conveyings；Setting section cooling be the sparse cooling of full section, and adjust roughing drafts be 80%~
85%, finishing temperature be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).
2. the high carbon steel sheet of high-plasticity according to claim 1 and high straightness, which is characterized in that the slab is offline
2~8h of slow cooling.
3. the high carbon steel sheet of high-plasticity according to claim 1 and high straightness, which is characterized in that slab slow cooling is extremely
300~700 DEG C.
4. the high carbon steel sheet of high-plasticity and high straightness described in any claim, feature exist according to claim 1-3
In the hot-loading and hot-conveying includes that slab enters heating stove heating at 300~700 DEG C, and heating temperature is 1150~1250 DEG C.
5. a kind of manufacturing method of the high carbon steel sheet of high-plasticity and high straightness, which comprises the following steps:
Smelt --- refining --- continuous casting --- the offline slow cooling of slab --- hot-loading and hot-conveying --- roughing --- finish rolling --- laminar flow
It is cooling that --- it is flat that cross section --- is batched --- in coil of strip slow cooling；
The high carbon steel sheet of the high-plasticity and high straightness that produce as needed, adjustment the offline slow cooling of slab to 300~700 DEG C into
Row hot-loading and hot-conveying, setting section cooling are the sparse cooling of full section, and the drafts for adjusting roughing is 80%~85%, finishing temperature
Be 850~950 DEG C, coiling temperature be 550 DEG C~(Ar1-20 DEG C).
6. the manufacturing method of the high carbon steel sheet of high-plasticity according to claim 5 and high straightness, which is characterized in that institute
The drafts for stating roughing is 80%~83%, and finishing temperature is 890~940 DEG C.
7. the manufacturing method of the high carbon steel sheet of high-plasticity according to claim 5 and high straightness, which is characterized in that institute
State the offline 2~8h of slow cooling of slab.
8. according to the manufacturer of high-plasticity described in claim 5~7 any claim and the high carbon steel sheet of high straightness
Method, which is characterized in that the hot-loading and hot-conveying includes that slab enters heating stove heating, heating temperature 1150 at 300~700 DEG C
~1250 DEG C.
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| CN201811343764.5A CN109321830A (en) | 2018-11-13 | 2018-11-13 | High-carbon steel plate with high ductility and toughness and high flatness and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110284047A (en) * | 2019-08-02 | 2019-09-27 | 武汉钢铁集团鄂城钢铁有限责任公司 | Carbon steel hot rolled strip and its manufacturing method in a kind of no blue shortness |
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| CN103173598A (en) * | 2013-03-11 | 2013-06-26 | 河北钢铁股份有限公司唐山分公司 | Annealing-free medium-high carbon steel plate making technology |
| CN104141093A (en) * | 2013-05-10 | 2014-11-12 | 河北钢铁股份有限公司承德分公司 | Automobile compartment body band steel with yield strength reaching 700MPa, and rolling method thereof |
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| CN103173598A (en) * | 2013-03-11 | 2013-06-26 | 河北钢铁股份有限公司唐山分公司 | Annealing-free medium-high carbon steel plate making technology |
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Application publication date: 20190212 |