CN110438401A - A kind of 800MPa level low alloy high-strength cold-rolled strip and its manufacturing method - Google Patents
A kind of 800MPa level low alloy high-strength cold-rolled strip and its manufacturing method Download PDFInfo
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- CN110438401A CN110438401A CN201910826008.6A CN201910826008A CN110438401A CN 110438401 A CN110438401 A CN 110438401A CN 201910826008 A CN201910826008 A CN 201910826008A CN 110438401 A CN110438401 A CN 110438401A
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- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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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- 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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Abstract
The present invention provides a kind of 800MPa level low alloy high-strength cold-rolled strip and its manufacturing methods, steel band ingredient includes: C:0.05-0.12% by mass percentage, Si:0.03-0.15%, Mn:1.00-1.70%, P :≤0.022%, S :≤0.010%, Alt:0.020-0.070%, Nb:0.01-0.07%, Ti:0.06-0.15%, surplus Fe；Manufacturing method: smelting, and is cast into base, slab heating, and finish rolling is batched, pickling, cold rolling, bell-type annealing, finishing.A kind of 800MPa level low alloy high-strength cold-rolled strip of the invention and its manufacturing method, realize that refined crystalline strengthening, precipitation strength are combined with processing hardening, performance is stablized, with excellent buckling performance, the inherent shortcoming of bell type annealing furnace is overcome, realizes the production of yield strength 800MPa level low alloy high-strength steel band.
Description
Technical field
The present invention relates to automobile low-alloy high-strength cold-rolled strips, high-strength more particularly to a kind of 800MPa level low alloy
Spend cold-rolled strip and its manufacturing method.
Background technique
Energy-saving and emission-reduction are the common challenges that current Global Auto industry faces, and advanced optimize conventional engines and vehicle
With property, alternative energy source and new-energy automobile, Efforts To Develop automotive light weight technology engineering etc. are accelerated development, is all very effective and arranges
It applies.As effective energy saving means, automotive light weight technology technology has become one of important subject of automobile industry development.Mesh
Before 800MPa grade cold-rolled steel sheet such as two-phase (DP) steel, phase change induction plasticity (TRIP) steel, twinning induced plasticity for developing
(TWIP) the automobile cold-rolled high strength steel such as steel and quenching partition (Q&P) steel industrial volume production, for automobile frame member,
On the components such as door anti-collision joist, bumper and seat slide, body of a motor car " lightweight " requirement is realized.But the above steel grade
It is phase transformation strengthening steel, it need to be after influence of high austenizing temp through microscopic structure needed for controlling cold acquisition, to capacity of equipment, alloy
Element and personnel's operation level have higher requirements.And the bell type annealing furnace as conventional annealing equipment, since cooling rate limits, one
It directly cannot achieve the production of 800MPa grades of high-strength steel of yield strength.As the components of this intensity rank, forming is relatively simple
Single, the deflection of steel plate is little, usually mainly by Bending Processing realization part forming, therefore its to buckling performance often require that compared with
It is high.
Summary of the invention
The present invention provides a kind of 800MPa level low alloy high-strength cold-rolled strip and its manufacturing method, steel band ingredient passes through
Micro Nb, Ti are added, matched rolling mill practice and annealing process are used in manufacturing method, and pass through control bell-type annealing work
The second phase of a certain proportion of deformation ferrite, tiny recrystallization ferrite and even dispersion can be obtained in skill, and can be in iron element
It is uniformly distributed tiny granular pearlite tissue on body matrix, is precipitated inside ferrite crystal grain with grain boundaries Dispersed precipitate microalloy
Object, performance are stablized, and have excellent buckling performance, overcome the inherent shortcoming of bell type annealing furnace, realize yield strength 800MPa grades
The production of Hi-Stren steel.
A kind of 800MPa level low alloy high-strength cold-rolled strip, steel band ingredient include: C:0.05- by mass percentage
0.12%, Si:0.03-0.15%, Mn:1.00-1.70%, P :≤0.022%, S :≤0.010%, Alt:0.020-
0.070%, Nb:0.01-0.07%, Ti:0.06-0.15%, surplus Fe.
It further include inevitable impurity in the steel band ingredient.
The steel band ingredient includes: C:0.06-0.10% by mass percentage.
The steel band ingredient includes: Si:0.03-0.10% by mass percentage.
The steel band ingredient includes: Mn:1.40-1.70% by mass percentage.
The steel band ingredient includes: Alt:0.030-0.050% by mass percentage.
The metallographic structure of the steel band is made of deformation ferrite, recrystallization ferrite and granular pearlite.
A kind of manufacturing method of 800MPa level low alloy high-strength cold-rolled strip, specifically carries out according to the following steps:
One, it is cast into base after routinely smelting, and slab is heated, heating temperature is kept the temperature at 1230-1270 DEG C
120-200min；
Two, finish rolling is carried out, and controls finishing temperature at 890-920 DEG C；
Three, it is batched, sets coiling temperature according to hot-rolled product thickness and batched, oiler temperature control 530-
580℃；
Four, cold rolling is carried out after conventional pickling, control cold rolling reduction ratio is 40-70%；
Five, bell-type annealing is carried out, with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h, is heated to soaking temperature
It 550-630 DEG C, soaking time 8-14h, then, cools to 120 DEG C or less with the furnace and comes out of the stove；
Six, finishing is carried out, finishing elongation control completes the low conjunction that yield strength is 800MPa grades in 0.8-1.6%
The manufacture of golden high-strength cold rolling steel band.
In the step 3, when product thickness≤3mm, oiler temperature control is 550-580 DEG C.
In the step 3, when product thickness > 3mm, oiler temperature control is 530-560 DEG C.
Advantages of the present invention: a kind of 800MPa level low alloy high-strength cold-rolled strip of the invention and its manufacturing method, steel
With ingredient by adding micro Nb, Ti, matched rolling mill practice and annealing process are used in manufacturing method, and pass through control cover
The second phase of a certain proportion of deformation ferrite, tiny recrystallization ferrite and even dispersion can be obtained in formula annealing process, and
Tiny granular pearlite tissue can be uniformly distributed on ferrite matrix, ferrite crystal grain inside and grain boundaries Dispersed precipitate are micro-
Alloy precipitate, performance are stablized, and have excellent buckling performance, overcome the inherent shortcoming of bell type annealing furnace, realize yield strength
The production of 800MPa level low alloy high-strength steel.
Detailed description of the invention
Fig. 1 is a kind of metallographic structure figure of 800MPa level low alloy high-strength cold-rolled strip of embodiment.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and examples and is further retouched in detail
It states, the embodiment is only for explaining the present invention, does not constitute and limits to protection scope of the present invention.
Embodiment one
A kind of 800MPa level low alloy high-strength cold-rolled strip is present embodiments provided, steel band ingredient wraps by mass percentage
It includes: C:0.07%, Si:0.09%, Mn:1.51%, P:0.018%, S:0.003%, Alt:0.031%, Nb:0.019%,
Ti:0.070%, surplus are Fe and other inevitable impurity.
Manufacturing method specifically carries out according to the following steps: one, it through routinely smelt after is cast into base, and slab is heated,
Heating temperature keeps the temperature 125min at 1255 DEG C；Two, finish rolling is carried out, and controls finishing temperature at 911 DEG C, finish rolling product thickness
For 4.6mm；Three, it is batched, oiler temperature control is 546 DEG C；Four, cold rolling is carried out after conventional pickling, is controlled under cold rolling
Rate is 60%；Five, it carries out bell-type annealing and is heated to soaking temperature with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
580 DEG C, soaking time 8h of degree, then, cools to 120 DEG C or less with the furnace and comes out of the stove；Six, finishing is carried out, finishing elongation control exists
0.8%, that is, complete the manufacture for the low-alloy high-strength cold-rolled strip that yield strength is 800MPa grades.
Embodiment two
A kind of 800MPa level low alloy high-strength cold-rolled strip is present embodiments provided, steel band ingredient wraps by mass percentage
It includes: C:0.09%, Si:0.04%, Mn:1.62%, P:0.013%, S:0.004%, Alt:0.035%, Nb:0.021%,
Ti:0.078%, surplus are Fe and other inevitable impurity.
Manufacturing method specifically carries out according to the following steps: one, it through routinely smelt after is cast into base, and slab is heated,
Heating temperature keeps the temperature 142min at 1247 DEG C；Two, finish rolling is carried out, and controls finishing temperature at 915 DEG C, finish rolling product thickness
For 4.2mm；Three, it is batched, oiler temperature control is 542 DEG C；Four, cold rolling is carried out after conventional pickling, is controlled under cold rolling
Rate is 58%；Five, it carries out bell-type annealing and is heated to soaking temperature with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
575 DEG C, soaking time 12h of degree, then, cools to 120 DEG C or less with the furnace and comes out of the stove；Six, finishing is carried out, finishing elongation control exists
1.2%, that is, complete the manufacture for the low-alloy high-strength cold-rolled strip that yield strength is 800MPa grades.
Embodiment three
A kind of 800MPa level low alloy high-strength cold-rolled strip is present embodiments provided, steel band ingredient wraps by mass percentage
It includes: C:0.06%, Si:0.08%, Mn:1.66%, P:0.020%, S:0.003%, Alt:0.046%, Nb:0.031%,
Ti:0.092%, surplus are Fe and other inevitable impurity.
Manufacturing method specifically carries out according to the following steps: one, it through routinely smelt after is cast into base, and slab is heated,
Heating temperature keeps the temperature 133min at 1244 DEG C；Two, finish rolling is carried out, and controls finishing temperature at 893 DEG C, finish rolling product thickness
For 4.2mm；Three, it is batched, oiler temperature control is 538 DEG C；Four, cold rolling is carried out after conventional pickling, is controlled under cold rolling
Rate is 47%；Five, it carries out bell-type annealing and is heated to soaking temperature with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
600 DEG C, soaking time 10h of degree, then, cools to 120 DEG C or less with the furnace and comes out of the stove；Six, finishing is carried out, finishing elongation control exists
1.1%, that is, complete the manufacture for the low-alloy high-strength cold-rolled strip that yield strength is 800MPa grades.
Example IV
A kind of 800MPa level low alloy high-strength cold-rolled strip is present embodiments provided, steel band ingredient wraps by mass percentage
It includes: C:0.07%, Si:0.06%, Mn:1.42%, P:0.017%, S:0.005%, Alt:0.035%, Nb:0.025%,
Ti:0.101%, surplus are Fe and other inevitable impurity.
Manufacturing method specifically carries out according to the following steps: one, it through routinely smelt after is cast into base, and slab is heated,
Heating temperature keeps the temperature 152min at 1258 DEG C；Two, finish rolling is carried out, and controls finishing temperature at 902 DEG C, finish rolling product thickness
For 2.9mm；Three, it is batched, oiler temperature control is 557 DEG C；Four, cold rolling is carried out after conventional pickling, is controlled under cold rolling
Rate is 62%；Five, it carries out bell-type annealing and is heated to soaking temperature with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
580 DEG C, soaking time 8h of degree, then, cools to 120 DEG C or less with the furnace and comes out of the stove；Six, finishing is carried out, finishing elongation control exists
1.5%, that is, complete the manufacture for the low-alloy high-strength cold-rolled strip that yield strength is 800MPa grades.
Embodiment five
A kind of 800MPa level low alloy high-strength cold-rolled strip is present embodiments provided, steel band ingredient wraps by mass percentage
It includes: C:0.08%, Si:0.04%, Mn:1.58%, P:0.017%, S:0.003%, Alt:0.040%, Nb:0.033%,
Ti:0.068%, surplus are Fe and other inevitable impurity.
Manufacturing method specifically carries out according to the following steps: one, it through routinely smelt after is cast into base, and slab is heated,
Heating temperature keeps the temperature 155min at 1260 DEG C；Two, finish rolling is carried out, and controls finishing temperature at 910 DEG C, finish rolling product thickness
For 2.5mm；Three, it is batched, oiler temperature control is 568 DEG C；Four, cold rolling is carried out after conventional pickling, is controlled under cold rolling
Rate is 52%；Five, it carries out bell-type annealing and is heated to soaking temperature with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
565 DEG C, soaking time 8h of degree, then, cools to 120 DEG C or less with the furnace and comes out of the stove；Six, finishing is carried out, finishing elongation control exists
1.4%, that is, complete the manufacture for the low-alloy high-strength cold-rolled strip that yield strength is 800MPa grades.
The numerical value of each ingredient percent into the steel band of embodiment five of embodiment one is as shown in the table:
| Embodiment | C | Si | Mn | P | S | Alt | Nb | Ti |
| Embodiment one | 0.07 | 0.09 | 1.51 | 0.018 | 0.003 | 0.031 | 0.019 | 0.070 |
| Embodiment two | 0.09 | 0.04 | 1.62 | 0.013 | 0004 | 0.035 | 0.021 | 0.078 |
| Embodiment three | 0.06 | 0.08 | 1.66 | 0.020 | 0.003 | 0.046 | 0.031 | 0.092 |
| Example IV | 0.07 | 0.06 | 1.42 | 0.017 | 0.005 | 0.035 | 0.025 | 0.101 |
| Embodiment five | 0.08 | 0.04 | 1.58 | 0.017 | 0.003 | 0.040 | 0.033 | 0.068 |
The major parameter into the steel band manufacturing method of embodiment five of embodiment one is as shown in the table:
To the performance detection of the steel band of embodiment one to embodiment five, detection data is as shown in the table:
By the performance detection of the steel band to embodiment one to embodiment five, from the available embodiment one of upper table to implementation
The obtained steel band of example five, longitudinal (rolling direction) R of steel bandp0.2>=800MPa, Rm>=810MPa, A80>=9%；It is laterally (vertical
In rolling direction) Rp0.2>=830MPa, Rm>=840MPa, A80>=4%, the equal 1T of transverse and longitudinal buckling performance does not crack, mechanical property
Stablize.
Each ingredient of the embodiment one into the steel band of embodiment five:
C: for the basic element and most economical, effective intensified element in steel, but too high levels then reduce the modeling of steel
Property and impact flexibility, and be easy to produce center segregation, it is unfavorable to bending property, deteriorate cold formability and welding performance, carbon content
It is too low, in order to reach predetermined strength, it is necessary to add a large amount of alloys and make up, increase cost of alloy, therefore, the mass percent of C
Content is controlled in 0.05-0.12%, preferably 0.06-0.10%；
Si: for ferrite generating elements, promote carbon to austenite segregation and inhibit the formation of carbide, to solid in ferrite
Molten carbon has removing and catharsis, to avoid gap solution strengthening；The steel band of embodiment need to be by the carbonitride of Nb, Ti in iron
Precipitation strength and crystal grain refinement in ferritic phase improve ferrite intensity, to reach high-yield strength, therefore, the matter of Si
Degree control is measured in 0.03-0.15%, preferably 0.03-0.10%；
Mn: playing solution strengthening effect, be it is a kind of it is economical can significantly improve one of alloying element of intensity, while can
Improve the harden ability of steel plate, but excessively high manganese content can the influence that generates of plasticity to steel and welding performance, therefore, the quality of Mn
Degree is controlled in 1.00-1.70%, preferably 1.40-0.17%；
P, S: for the harmful element in steel, P segregation easily on crystal boundary causes embrittlement, and S easily forms MnS etc. in steel and is mingled with
Object makes the toughness plasticity of steel be deteriorated, and the mass percentage content of P, S are controlled respectively in 0.022% and 0.010% or less；
Alt:Al is main deoxidier, while Al can also form AlN precipitation, play certain Grain refinement,
When Al is added for deoxidation, unsuitable too low, otherwise Mn, Si etc. coarse oxide largely disperses in steel, deteriorates steel, but
Excessive tufted aluminium oxide inclusion increases, and so that the plasticity of steel and weldability is deteriorated, and will affect steel-making and continuous casting, because
This, Alt content is controlled in 0.020-0.070%, preferably 0.030-0.050%；
Nb, Ti: having precipitation strength effect, is the element for the yield strength and refinement crystal grain for effectively improving steel, Nb is added
With Ti element, carbonitride is formed, plays the role of refining grain size and keeps carbon, ferrite matrix is made to be strengthened, reduced
It recrystallizes ferrite and deforms the difference of hardness of ferrite and pearlite phase, effectively improve the buckling performance of steel plate, to make to refine iron
Ferritic crystallite dimension and the ferritic intensity of raising, the mass percentage content of Nb, Ti are controlled in 0.01-0.07% and 0.06-
0.15%.
Embodiment one is into the manufacturing method of the steel band of embodiment five:
In step 1, heating temperature is between 1230-1270 DEG C, soaking time 120-200min, wherein soaking temperature
Control can increase the solid solution capacity of Nb at 1230 DEG C or more, improve precipitating reinforcing effect, but soaking temperature is not above 1270 DEG C,
To avoid slab overheat and burning；Soaking time controls between 120-200min, to keep tissue and the ingredient of slab sufficiently equal
It homogenizes, and avoids the energy consumption of heating time too long generation；
In step 2, finishing temperature control is to be precipitated for alloying element solid solution in annealing with thin at 890-920 DEG C
Change crystal grain, also, in Ar3The above high-temperature final rolling, is conducive to structural homogenity, prevents the generation of mixed crystal, banded structure；Finish to gauge temperature
Degree is no more than 920 DEG C, and to prevent the excessive abnormal growth of recrystal grain, excessively high finishing temperature leads to the production quantity of oxide
It increased dramatically, the plate surface quality after pickling and cold-rolling is deteriorated, and reduces the plasticity of steel plate；
In step 3, when using different coiling temperatures, i.e. hot-rolled product thickness≤3mm by thickness specification, coiling temperature exists
550-580℃；As product thickness > 3mm, coiling temperature is at 530-560 DEG C；It batches, can effectively refine under this temperature range
Pearlite is also possible to prevent the Carbonitride Precipitation object roughening of Nb, Ti, prevents ferrite crystal grain from growing up, pressed by coiling temperature
The second phase of uniformly tiny crystal grain, even dispersion can be obtained away from the mode controlled respectively in thickness group, while obtaining different-thickness
The unification of the mechanical property of steel plate of specification, stabilization；
In step 4, cold rolling reduction ratio is improved as far as possible within the scope of cold mill complex rolling power, the big reduction ratio that rolls increases
Deformation and energy storage reduces recrystallization temperature, refines crystal grain, and therefore, the control of cold rolling reduction ratio is 40-70%；
In step 5,400 DEG C of bell-type annealing process selection or less are controlled with stove heating, 400 DEG C or more heating speeds 50
DEG C/h, it 550-630 DEG C of soaking temperature, soaking time 8-14h, cools to 120 DEG C or less with the furnace and comes out of the stove；Wherein, from room temperature to 400
DEG C, heating speed is without restriction, and according to the principle in crystallization process, strip is from room temperature to 400 DEG C, and strip interior tissue is without aobvious
Variation is write, the crystal grain being elongated in the operation of rolling is just restored, and not yet forms recrystallization, therefore in the heating of this section steel
The faster the better for speed；It is heated to holding temperature by 400 DEG C, thermal velocity control is heated in 50 DEG C/h since bell type annealing furnace exists
Temperature unevenness problem, 50 DEG C/h heating speed can not only guarantee the temperature uniformity of strip entire volume within the acceptable range, but also
It is unlikely to cause production efficiency to reduce slowly very much；550-630 DEG C of soaking temperature, guarantee to obtain proper ratio in this temperature range
Ferrite volume fraction is recrystallized, while recrystal grain will not excessively grow up again, on the one hand guarantees final finished yield strength
>=800MPa, on the other hand tiny recrystal grain reduces the intensity difference with non-recrystallization tissue, guarantees in deformation process
Strain is uniformly distributed in each phase, and crackle is inhibited to generate, and increases finished product buckling performance；Soaking time 8-14h guarantees entire volume steel band
Temperature low spot also can reach required recrystallization temperature, while be unlikely to that production efficiency is caused to be substantially reduced again；Cool to 120 with the furnace
DEG C or less come out of the stove, guarantee that strip contacts the generation of the defects of will not aoxidizing, lead to surface chromatic aberration with air；
In step 6, on the one hand finishing elongation control ensure that the requirement of steel belt plate shape, on the other hand in 0.8-1.6%
By the smooth generating portion mobile dislocation inside recrystal grain, guarantee final finished Rp0.2With RmDifference >=10MPa.
The 800MPa level low alloy high-strength cold-rolled strip that above embodiments provide, steel band ingredient are micro by adding
Nb, Ti use matched rolling mill practice and annealing process in manufacturing method, and by control bell-type annealing technique, can be obtained one
The deformation ferrite of certainty ratio, tiny the second phase for recrystallizing ferrite and even dispersion, and can be on ferrite matrix
The tiny granular pearlite tissue of even distribution, ferrite crystal grain inside and grain boundaries Dispersed precipitate microalloy precipitate, performance are steady
It is fixed, there is excellent buckling performance, overcome the inherent shortcoming of bell type annealing furnace, realize that yield strength 800MPa level low alloy is high-strength
Spend the production of steel.
Above-described embodiment is only the best example, should not in any way limit the present invention, all to use equivalent replacement or equivalent
The technical solution that the mode of conversion obtains is fallen within the scope of protection of the present invention.
Claims (10)
1. a kind of 800MPa level low alloy high-strength cold-rolled strip, it is characterised in that: steel band ingredient includes: C by mass percentage:
0.05-0.12%, Si:0.03-0.15%, Mn:1.00-1.70%, P :≤0.022%, S :≤0.010%, Alt:0.020-
0.070%, Nb:0.01-0.07%, Ti:0.06-0.15%, surplus Fe.
2. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
It further include inevitable impurity in ingredient.
3. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
Ingredient includes: C:0.06-0.10% by mass percentage.
4. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
Ingredient includes: Si:0.03-0.10% by mass percentage.
5. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
Ingredient includes: Mn:1.40-1.70% by mass percentage.
6. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
Ingredient includes: Alt:0.030-0.050% by mass percentage.
7. a kind of 800MPa level low alloy high-strength cold-rolled strip according to claim 1, it is characterised in that: the steel band
Metallographic structure by deformation ferrite, recrystallization ferrite and granular pearlite constitute.
8. a kind of manufacturing method of 800MPa level low alloy high-strength cold-rolled strip, it is characterised in that: specifically according to the following steps into
Capable:
One, it is cast into base after routinely smelting, slab is heated, heating temperature keeps the temperature 120- at 1230-1270 DEG C
200min；
Two, finish rolling is carried out, and controls finishing temperature at 890-920 DEG C；
Three, it is batched, sets coiling temperature according to hot-rolled product thickness and batched, oiler temperature control 530-580
℃；
Four, cold rolling is carried out after conventional pickling, control cold rolling reduction ratio is 40-70%；
Five, it carries out bell-type annealing and is heated to soaking temperature 550- with stove heating to 400 DEG C, then under the heating speed of 50 DEG C/h
It 630 DEG C, soaking time 8-14h, then, cools to 120 DEG C or less with the furnace and comes out of the stove；
Six, finishing is carried out, finishing elongation control is high for 800MPa grades of low-alloy in 0.8-1.6%, i.e. completion yield strength
The manufacture of strong cold-rolled strip.
9. a kind of manufacturing method of 800MPa level low alloy high-strength cold-rolled strip according to claim 8, feature exist
In: in the step 3, when product thickness≤3mm, oiler temperature control is 550-580 DEG C.
10. a kind of manufacturing method of 800MPa level low alloy high-strength cold-rolled strip according to claim 8, feature exist
In: in the step 3, when product thickness > 3mm, oiler temperature control is 530-560 DEG C.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111676422A (en) * | 2020-06-17 | 2020-09-18 | 苏州翔楼新材料股份有限公司 | Cold-rolled high-carbon steel strip for V-saw blade matrix and production method thereof |
| CN112442635A (en) * | 2020-11-13 | 2021-03-05 | 唐山钢铁集团高强汽车板有限公司 | High-performance low-alloy high-strength steel plate with strength of above 800MPa and preparation method thereof |
| CN113930599A (en) * | 2021-09-24 | 2022-01-14 | 首钢集团有限公司 | Manufacturing method for improving homogeneity of galvanized HSLA structure |
| CN113930677A (en) * | 2021-09-24 | 2022-01-14 | 首钢集团有限公司 | Steel belt for packaging and production method thereof |
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| WO2016005811A1 (en) * | 2014-07-11 | 2016-01-14 | Arcelormittal | Hot-rolled steel sheet and associated manufacturing method |
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| WO2016005811A1 (en) * | 2014-07-11 | 2016-01-14 | Arcelormittal | Hot-rolled steel sheet and associated manufacturing method |
| CN107460404A (en) * | 2017-07-17 | 2017-12-12 | 河钢股份有限公司 | A kind of yield strength 800MPa ultra-high strength strip steels and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111676422A (en) * | 2020-06-17 | 2020-09-18 | 苏州翔楼新材料股份有限公司 | Cold-rolled high-carbon steel strip for V-saw blade matrix and production method thereof |
| CN112442635A (en) * | 2020-11-13 | 2021-03-05 | 唐山钢铁集团高强汽车板有限公司 | High-performance low-alloy high-strength steel plate with strength of above 800MPa and preparation method thereof |
| CN113930599A (en) * | 2021-09-24 | 2022-01-14 | 首钢集团有限公司 | Manufacturing method for improving homogeneity of galvanized HSLA structure |
| CN113930677A (en) * | 2021-09-24 | 2022-01-14 | 首钢集团有限公司 | Steel belt for packaging and production method thereof |
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