CN107916363A - A kind of yield strength 550MPa grades of cold-rolled steel sheets and its manufacture method - Google Patents
A kind of yield strength 550MPa grades of cold-rolled steel sheets and its manufacture method Download PDFInfo
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- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 238000005452 bending Methods 0.000 claims abstract description 7
- 238000012797 qualification Methods 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims description 34
- 238000005097 cold rolling Methods 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 26
- 238000005098 hot rolling Methods 0.000 claims description 19
- 238000002791 soaking Methods 0.000 claims description 16
- 239000010936 titanium Substances 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001953 recrystallisation Methods 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000007704 transition Effects 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
- C22C38/02—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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of yield strength 550MPa grades of cold-rolled steel sheets and its manufacture method, the horizontal Oa buckling performances qualification that mainly solves existing yield strength 550MPa grades of cold-rolled steel sheets is low, manufacture is of high cost technical problem.A kind of yield strength 550MPa grades of cold-rolled steel sheets provided by the invention, its chemical component weight percentage are：C：0.04~0.12%, Si：0.15~0.30%, Mn：0.5~1.0%, P≤0.020%, S≤0.010%, Alt：0.015~0.060%, Ti：0.03~0.08%, surplus is iron and is unavoidably mingled with.550~650MPa of yield strength of cold-rolled steel sheet of the present invention, elongation after fracture A80For 12~18%, meet transverse direction 0a 180 ° of qualified performance requirements of bending；It is mainly used for the building field of the steel construction surfaces externally and internally such as roof, metope.
Description
Technical field
The present invention relates to a kind of yield strength 550MPa grades of cold-rolled steel sheets, more particularly to a kind of yield strength 550MPa grades cold
Rolled steel plate and its manufacture method, belong to technical field of iron-base alloy.
Background technology
As building trade is to the construction(al)steel suitable for the steel construction surfaces externally and internally such as roof, metope, it is desirable to have lightweight,
The characteristics such as high-strength, antidetonation, long lifespan.Wherein using corrugated sheet as Typical Representative, requirement of the user for steel is exactly to be provided simultaneously with
High-strength, high-ductility, small part high-end user propose horizontal 180 ° of qualified high requests of 0a bendings for steel.
The production technology of cold rolling high-strength steel mainly has at present：When low-carbon and low-alloy composition design, after cold rolling is strengthened
The technique for carrying out partial annealing, makes full use of the processing of cold rolling to harden, suitable for material plasticity product of less demanding, being somebody's turn to do
Technique is simple, and production cost is low；Second, by C, Mn solution strengthening, the strength of materials declines notable when annealing under the component, is applicable in
In the relatively not high product design of intensity；Third, V-N steel, forms Secondary phase particle and obtains the original grain for stablizing refinement, then
With reference to certain cold rolled annealed technique, this design is presently the most common, but the microalloy such as Nb, Ti, Cr price is high, and economy is not
Foot.
Application publication number is that the Chinese patent document of CN102199723A discloses a kind of high strength cold rolling hot dip galvanizing precipitation
Strengthen steel plate and its manufacture method, the chemical composition of its substrate are：C：0.09~0.12wt%, Si≤0.05wt%, Mn：0.8
~1.8wt%, P≤0.02wt%, S≤0.01wt%, N≤0.008wt%, Al：0.02~0.06wt%, Nb+Ti：0.05~
0.08wt%, remaining is Fe and inevitable impurity.Microstructure adds second phase particles for ferrite, and particle is straight in the second phase
Footpath is about being more than 14% (80 in 500~600MPa, tensile strength less than 6um, yield strength in 570~710MPa, breaking elongation
Gauge length, cross directional stretch).The technique with the addition of more alloy, and cost is higher, and C content design is in the slab quality control of peritectoid area
Make unstable.
Application publication number be CN103088261A Chinese patent document disclose a kind of tensile strength 600MPa grades it is high-strength
Cold-rolled steel sheet is spent, count by weight percentage, the content of its component is：C：0.07~0.10%；Si：0.15~0.20%；Mn：
1.00%~1.40%；P：≤ 0.030%；S：≤ 0.030%；Al：0.025%~0.075%；Ti：0.020~0.050%；
Nb：0.030~0.060%；N：≤ 0.005%.Above-mentioned technical proposal is by using the chemical composition of Hi-Stren steel, system
Fixed suitable continuous annealing temperature schedule, coordinates hot rolling, cold-rolling process, and it is high in more than 600MPa, elongation percentage to obtain tensile strength
In 12% high strength steel, while ensure good plate shape, surface quality, punching performance and welding performance.The design is equally closed
Golden additive amount is more, and not high to S controls, has certain detrimental effect for plasticity.
The Chinese patent document that application publication number is CN102400035A discloses a kind of yield strength more than 550MPa's
Ultra-fine Grained common carbon steel board and its manufacture method, steel plate chemical composition are C 0.14%~0.18%, Si1.0%~1.5%, Mn
1.5%~1.8%, P≤0.01%, S≤0.01%, surplus are Fe and inevitable impurity.Manufacture method：By heating strand
To 1000~1100 DEG C of 1~2h of insulation, hot rolling slab is rolled into, is cooled to room temperature；Hot rolling slab after cooling is heated to
After 500~600 DEG C of 1~2h of insulation, multi- pass rolling is carried out, it is ＞ 60% to add up drafts, is taken out with 1h is kept the temperature after 600 DEG C
Room temperature is air-cooled to, obtains warm-rolling slab；Warm-rolling slab is heated to austenite low-temperature space after cold rolling, with the speed of >=10 DEG C/s
900~950 DEG C, after keeping the temperature 1~5s, 700~800 DEG C are cooled to the cooling velocity of >=5 DEG C/s, immediately continuous rolling, stagnation pressure
Lower amount is 50%~70%, is cooled to room temperature immediately, obtains diversified Organization Matching, ensures ferritic 2 μ of average-size ＜
M, breaking elongation ＞ 15%, can ensure good plasticity while high intensity is obtained.The technical solution does not add Ti, Nb
Deng alloy, designed by higher Mn solution strengthening and multiple rolling mill practice, obtain refined crystalline strengthening effect, cost of alloy it is not low and
Long flow path manufacture is of high cost, high for common building materials production cost.
Application publication number be CN102011056A Chinese patent document disclose a kind of yield strength 550MPa grades it is high-strength
Cold-rolled steel sheet and preparation method thereof is spent, this method is prepared using flows such as bar strip continuous casting and rolling flow path, cold rolling, annealing, finishing
Form.Wherein, the main chemical compositions of molten steel are after refining：C：0.03~0.07wt.%, Si：≤ 0.35wt.%, Mn：0.35
~1.2wt.%, P：≤ 0.020wt.%, S≤0.010wt.%, Cr：0.25~0.80wt.%, Ti：0.04~
0.12wt.%, remaining is Fe and inevitable residual elements；In the annealing process, in 500 DEG C of temperature to A1 transition points
In the range of the steel is annealed in bell type annealing furnace.The program is nearby covered using cold rolling small deformation rate, recrystallization temperature point
The technique of formula annealing, with the addition of more Cr, Ti alloy to ensure armor plate strength, and the cost is relatively high, and due to the small change of cold rolling
Shape is very thin for the product hot plate needs of Thin Specs, it is difficult to realize.
Generally speaking, in order to obtain the plate property of high intensity, high-ductility at the same time, the larger design of feasibility at present is
Microalloy is added, since finished product is cold rolling use, the influence of cold rolling and annealing to performance is very big, but there are the cost of alloy of steel plate
The defects of height, transverse direction Oa buckling performances are qualified low.
The content of the invention
The object of the present invention is to provide a kind of yield strength 550MPa grades of cold-rolled steel sheets and its manufacture method, mainly solves existing
There is the technical problem that the horizontal Oa buckling performances qualification of 550MPa grades of cold-rolled steel sheets of yield strength is low, manufacture is of high cost, meet high
Hold demand of the construction market to high intensity, high-ductility cold-rolled steel sheet.
The technical solution adopted by the present invention is：A kind of yield strength 550MPa grades of cold-rolled steel sheets, its chemical component weight hundred
Divide ratio：C：0.04%~0.12%, Si：0.15%~0.30%, Mn：0.5%~1.0%, P≤0.020%, S≤
0.010%, Alt：0.015%~0.060%, Ti：0.03%~0.08%, surplus is Fe and inevitable impurity element.
The metallographic structure of yield strength 550MPa grades of cold-rolled steel sheets of the present invention is ferrite and disperse titanium carbide granule, is organized
Grain size number is I10~I11 grades, the yield strength R of cold-rolled steel sheetp0.2For 550~620MPa, tensile strength RmFor 600~
680MPa, elongation after fracture A80For 12~18%, horizontal 180 ° of qualifications of 0a bendings.
The reasons why chemical composition of yield strength 550MPa grades of cold-rolled steel sheets of the present invention limits within the above range
It is as follows：
Carbon：Carbon is the element of most economical reinforcing mechanical property, and the tensile strength and hardness of material are with the increasing of carbon content
Add and increase, C is added for enhancing armor plate strength, the tensile strength of steel plate can be increased by increasing the content of C, while with it is micro in steel
Element such as Ti etc., which forms TiC precipitates, has intensity enhancing effect, but when adding excessive C, the machinability of steel and weldering
Connecing performance can decline, and therefore, the C content that the present invention is set is 0.04%~0.12%.
Silicon：Silicon is the beneficial element in steel, and a kind of economical intensified element, has very strong solution strengthening effect,
The intensity and hardness of tie can be improved.But when content is higher, the plasticity for making tie and toughness are remarkably decreased, seriously affected at the same time
Product surface quality.Silicone content is too low, strengthens effect by weakening, influences product strength.Therefore, the present invention set Si contents as
0.15~0.30%.
Manganese：Manganese is both economical intensified element, can improve the tensile strength of steel plate, appropriate raising quenching degree, in right amount
Manganese not only improved toughness but also improve cold-rolling workability energy.In addition manganese can combine to form manganese sulfide with sulphur, largely reduce
Red brittleness caused by sulphur and cold brittleness.Therefore, the present invention sets manganese content as 0.5~1.0%.
Phosphorus：Phosphorus is the harmful element in steel, easily causes serious segregation, reduces the toughness of steel plate, causes brittle failure occurs.
In addition, excessive P content will significantly reduce the welding performance of tie, removal generally should give.Therefore, the present invention limit P≤
0.020%.
Height is required in view of buckling performance, as far as possible controls S with low content.Therefore, the present invention limits S≤sulphur：Sulphur is steel
In harmful element, easily cause welding performance that is hot-short, and weakening steel plate, 0.010%.
Aluminium：Aluminium is produced into effective small and dispersed thing with nitrogen or oxygen and suppresses crystal grain and grow up, and can obtain more tiny block
Columnar ferrite and pearlite colony improve the intensity and toughness of steel.Meanwhile aluminium is also excellent deoxidier.Therefore, the present invention limits
Al content is 0.015~0.060%.
Titanium：Titanium can with the C and N of steel with reference to and be deposited and separate out, reach the effect of refined crystalline strengthening, thus strengthen steel plate
Intensity, and ferritic recrystallization can be postponed, ensure the stability of the material structure in annealing process, Ti additions can excessively increase
Addition sheet, therefore, the present invention limit Ti contents as 0.03~0.08%.
A kind of production method of yield strength 550MPa grades of cold-rolled steel sheets, this method include：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the ladle chemistry percentage by weight：C：0.04%~
0.12%, Si：0.15%~0.30%, Mn：0.5%~1.0%, P≤0.020%, S≤0.010%, Alt：0.015%~
0.060%, Ti：0.03%-0.08%, surplus are Fe and inevitable impurity element；
The heated stove heat of continuous casting steel billet is two-part rolling to hot rolling, the hot rolling is carried out after 1200 DEG C~1250 DEG C
Technique, roughing are 5 passage tandem rollings, are rolled more than austenite recrystallization temperature, and roughing end temp is 1010 DEG C~1050 DEG C；
Finish rolling is 7 passage tandem rollings, and finish rolling rolls in austenite one phase section, and finish rolling end temp is 820 DEG C~860 DEG C, finish rolling pressure
Rate is 80%~86%, and steel plate thickness is 2.3mm~3.0mm after finish rolling, and the section cooling stage is cooled down using back segment, coiling temperature
Batch to obtain coils of hot-rolled steel for 550 DEG C~650 DEG C；
Coils of hot-rolled steel is again after uncoiling through pickling, cold rolling, Horizontal Continuous Furnace annealing, smooth, batch to obtain thickness be
0.45mm~1.2mm finished steel plates, the cold rolling reduction ratio are 60%~80%, roll hard state steel band sleeping after cold rolling
The soaking zone temperature of formula continuous annealing furnace annealing is 700 DEG C~800 DEG C, and steel band is 90s~180s in the annealing time of soaking zone；
Smooth elongation percentage is 0.5%~1.2%.
Further, steel band is 700 DEG C~750 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed, and steel band is in soaking
The annealing time of section is 120s~180s；Steel band is 750 DEG C~800 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed,
Steel band is 90s~120s in the annealing time of soaking zone.
The reasons why production technology that the present invention takes, is as follows：
1st, continuous casting steel billet heating-up temperature
The setting of slab heating temperature temperature is related to component in steel, due to the addition of the tiny TiC of Ti expectation acquisition disperses,
TiN Secondary phase particles strengthen tissue, using higher slab heating temperature the Secondary phase particle of bulky grain need to be weighed
It is new to incorporate substrate disperse educt again, therefore, hot rolling heating and temperature control is set as 1200 DEG C~1250 DEG C；
2nd, finish rolling end temp is set
Since carbon and manganese content is higher in steel, the more conventional product phase point temperature of transformation temperature has declined, in order to obtain uniformly
Tiny hot rolling microstructure, need to use relatively low finishing temperature, meanwhile, finishing temperature is excessive, and original austenite tissue is thick also
Widmannstatten structure is formed, brings material plasticity to decline, therefore, the control of finish rolling end temp is 820 DEG C~860 DEG C；
3rd, hot-rolling coiling temperature is set
Coiling temperature is set, and low temperature, which batches, to be conducive to obtain as far as possible tiny ferritic structure, and high temperature coiling is then to more
More tiny titanium carbide granule separates out favorably, therefore considers the raising strength of materials and obtain good plasticity, hot rolling reeling
Temperature control is 550 DEG C~650 DEG C.
4th, cold rolling reduction ratio is set
Cold rolling of the present invention carries out once cold rolling using 6 roller UCM (roller band intermediate calender rolls play) 5 Stands Cold Tandem Mills, using 5
Passes.In view of hot plate yield strength in 500MPa or so, belong to higher-strength, according to the research of applicant, at this
Under the conditions of the component and hot rolling technology of invention steel, if cold rolling total reduction is less than 60%, one side work-hardening capacity is inadequate,
The strength of materials does not reach requirement, on the other hand then too small for the hot rolling plate thickness needed for cold plate Thin Specs, increase hot rolling production
Difficulty and cost of material；And if total reduction is higher than 80%, work-hardening capacity is excessive, drastically increases for tandem mill difficulty
Greatly, roll wear increases and easily broken belt occurs and the defects of side is split, will increase processing cost；Consider, the present invention is preferably
The reduction ratio of cold rolling is 60%~80%.
5th, the setting of annealing temperature and annealing time
The present invention is annealed using Horizontal Continuous Furnace, in order to meet cold-rolled steel sheet transverse direction 0a buckling performance requirements, application
Principle is recrystallized, the strip of processing hardening is needed to match suitable annealing time and temperature, annealed structure is granular ferrite
With Dispersed precipitate carbide tissue.Annealing temperature is high, organizes the speed of recovery and recrystallization just fast, reaches the required of target plasticity and moves back
The fiery time is with regard to short, but excessive annealing temperature causes the too fast intensity of tissue recrystallization coarsening rate to decline excessively.Present invention setting
Steel band Horizontal Continuous Furnace soaking zone annealing temperature be 700 DEG C~800 DEG C, be set as in the time of soaking zone 90s~
180s；Preferably, steel band is 700 DEG C~750 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed, and steel band is in soaking zone
Annealing time is 120s~180s；Steel band is 750 DEG C~800 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed, steel band
It is 90s~120s in the annealing time of soaking zone.
The metallographic structure of the 550MPa grades of cold-rolled steel sheets of yield strength of the method for the present invention production is plain for the iron of the shaft-like such as approximation
Body and disperse titanium carbide granule, tissue grain size number are I10.0~I11.0 grades, the yield strength R of cold-rolled steel sheetp0.2For 550
~620MPa, tensile strength RmFor 600~680MPa, elongation after fracture A80For 12~18%, horizontal 180 ° of qualifications of 0a bendings.
The present invention has following good effect compared with prior art：1st, the present invention strengthens after annealing realization height by rolling
By force, high-ductility, production process is few, is not required to using the heat treatment mode such as lead annealing or two-phase section quenching, low processing cost.2、
The present invention makes full use of the control technique of carbon, the reinforcing effect of element silicon and hot rolling refined crystalline strengthening, and adds appropriate titanium and form carbon
Compound is strengthened, and obtains required intensity and plasticity, meets the indehiscent performance requirement of transverse direction Oa bendings, in equality strength level
Cost of alloy is lower in other design.3rd, cold rolling and annealing process of the invention have matched composition design, hot rolling technology, take into account
Cold rolling and the production difficulty of hot rolling, make the processing route of this full process easy to implement, there is preferable application.
Brief description of the drawings
Fig. 1 is the metallographic structure photo of the cold-rolled steel sheet after the embodiment of the present invention 1 is annealed.
Embodiment
With reference to embodiment 1~5, the present invention will be further described.
Table 1 is the chemical composition (by weight percentage) of steel of the embodiment of the present invention, and surplus is iron and inevitable impurity.
The chemical composition of 1 steel of the embodiment of the present invention of table, unit：Percentage by weight.
The molten steel for meeting chemical composition requirement is obtained by converter melting, molten steel blows Ar through LF ladle refining furnace refining procedures
Processing, the rear sheet billet continuous casting that carries out obtain continuous casting steel billet；Continuous casting steel billet thickness is 210~230mm, and width is 900~1600mm, long
Spend for 8500~11000mm.
The scale slab of STEELMAKING PRODUCTION send to heating furnace and reheats, and send to hot tandem and rolls after de-scaling of coming out of the stove.Pass through
Roughing and finish rolling Continuous mill train controlled rolling, are batched after section cooling, and section cooling takes back segment to cool down, and output is qualified
Coils of hot-rolled steel.The thickness of hot rolled steel plate is 2.3~3.0mm.Hot rolling technology control parameter is shown in Table 2.
2 hot rolling technology control parameter of the embodiment of the present invention of table
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, in 6 roller UCM (roller band intermediate calender rolls play) the cold company of 5 racks
Milling train carries out once cold rolling, and the reduction ratio of cold rolling is 60%~80%, and the steel band that hard state is rolled after cold rolling passes through horizontal company
Continuous anneal, it is smooth, batch to obtain the finished steel plate of thickness 0.45mm~1.2mm.Annealing process is：Steel band is in horizontal company
The annealing region of the soaking zone of continuous annealing furnace is 700 DEG C~800 DEG C, is 90s~180s in the time of soaking zone；It is smooth to prolong
Rate is stretched for 0.5%~1.2%.Cold rolling, annealing process control parameter are shown in Table 3.
3 cold rolling of the embodiment of the present invention of table, annealing process control parameter
550MPa grades of cold-rolled steel sheets of yield strength obtained using the above method, referring to Fig. 1, the metallographic group of cold-rolled steel sheet
Ferrite and disperse titanium carbide granule are woven to, tissue grain size number is I10.0~I11.0 grades, the yield strength of hot rolled steel plate
Rp0.2For 550-620MPa, tensile strength RmFor 600-680MPa, elongation after fracture A80For 12-18%, horizontal 180 ° of 0a bendings
It is qualified.
550MPa grades of cold-rolled steel sheets of yield strength that the present invention is obtained are according to Tensile Testing Method of Metallic Materials (GB/T
228.1), the microscopic structure assessment method (GB/T 13299) of steel, bend test of metal materials method (GB/T 232) are drawn
Stretch, microscopic structure and crooked test, the mechanical property of cold-rolled steel sheet are shown in Table 4.
The mechanical property of 4 cold-rolled steel sheet of the embodiment of the present invention of table
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the protection domains of application claims.
Claims (3)
1. a kind of thickness is 550MPa grades of cold-rolled steel sheets of 0.45mm~1.20mm yield strengths, its chemical component weight percentage：
C：0.04~0.12%, Si：0.15~0.30%, Mn：0.5~1.0%, P≤0.020%, S≤0.010%, Alt：0.015
~0.060%, Ti：0.03~0.08%, surplus is Fe and inevitable impurity element；The microscopic structure of the cold-rolled steel sheet
For ferrite+disperse titanium carbide granule, the tissue grain size number is I10.0~I11.0 grades；The surrender of the cold-rolled steel sheet
Intensity Rp0.2 it is 550-620MPa, tensile strength RmFor 600-680MPa, elongation after fracture A80For 12-18%, horizontal 0a bendings
180 ° of qualifications.
2. a kind of manufacture method of yield strength 550MPa grades of cold-rolled steel sheets, including：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the ladle chemistry percentage by weight：C：0.04~0.12%, Si：
0.15~0.30%, Mn：0.5~1.0%, P≤0.020%, S≤0.010%, Alt：0.015~0.060%, Ti：0.03~
0.08%, surplus is Fe and inevitable impurity element；
The heated stove heat of continuous casting steel billet rolls work to hot rolling, the hot rolling is carried out after 1200 DEG C~1250 DEG C for two-part
Skill, roughing are 5 passage tandem rollings, are rolled more than austenite recrystallization temperature, and roughing end temp is 1010 DEG C~1050 DEG C；Essence
Roll and rolled for 7 passage tandem rollings, finish rolling in austenite one phase section, finish rolling end temp is 820 DEG C~860 DEG C, finish rolling reduction ratio
For 80%~86%, after finish rolling the section cooling stage cooled down using back segment, coiling temperature batches to obtain heat for 550 DEG C~650 DEG C
Rolled steel coils；
Coils of hot-rolled steel is again after uncoiling through pickling, cold rolling, Horizontal Continuous Furnace annealing, smooth, batch to obtain thickness be
0.45mm~1.20mm finished steel plates, the cold rolling reduction ratio are 60%~80%, and the hard state steel band that rolls after cold rolling exists
The soaking zone temperature of Horizontal Continuous Furnace annealing is 700 DEG C~800 DEG C, and steel band is 90-180s in the annealing time of soaking zone；
Smooth elongation percentage is 0.5-1.2%.
3. the manufacture method of yield strength 550MPa grades of cold-rolled steel sheets as claimed in claim 2, it is characterized in that, hot fine rolling
Afterwards, it is 2.3~3.0mm to control hot rolled steel plate thickness.
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| CN109680129A (en) * | 2019-02-22 | 2019-04-26 | 武汉钢铁有限公司 | A kind of 500MPa grades of cold rolling micro-alloy high-strength steel and preparation method thereof |
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| CN109680129A (en) * | 2019-02-22 | 2019-04-26 | 武汉钢铁有限公司 | A kind of 500MPa grades of cold rolling micro-alloy high-strength steel and preparation method thereof |
| CN109778069A (en) * | 2019-03-29 | 2019-05-21 | 武汉钢铁有限公司 | A kind of the steel multistage cold rolling Hi-Stren steel and its manufacturing method of yield strength covering 240 ~ 270Mpa rank |
| CN109811267A (en) * | 2019-03-29 | 2019-05-28 | 武汉钢铁有限公司 | A kind of the steel multistage cold rolling Hi-Stren steel and its manufacturing method of yield strength covering 300~340Mpa rank |
| CN110004360A (en) * | 2019-03-29 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of yield strength is not less than 650MPa grades of bendings cold rolling hard steel band and manufacturing methods |
| CN110079735A (en) * | 2019-05-17 | 2019-08-02 | 武汉钢铁有限公司 | 460MPa grades of yield strength of cold rolling Hi-Stren steel and production method |
| CN112553522A (en) * | 2019-09-25 | 2021-03-26 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip aluminum-zinc plated steel plate with excellent bending performance and manufacturing method thereof |
| CN112779386A (en) * | 2019-11-05 | 2021-05-11 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof |
| CN111647816A (en) * | 2020-05-12 | 2020-09-11 | 首钢集团有限公司 | 550 MPa-level continuous hot-dip galvanized structural steel plate and preparation method thereof |
| CN113943888A (en) * | 2021-09-01 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
| CN113846261A (en) * | 2021-09-28 | 2021-12-28 | 唐山瑞丰钢铁（集团）有限公司 | Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition |
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| CN117196317B (en) * | 2023-10-08 | 2024-10-22 | 鞍钢股份有限公司 | A method for predicting the risk of strip breakage during cold-rolled high-strength steel rolling based on raw material properties |
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