CN108998739A - A kind of hot rolling acid-cleaning strip and its production method with high reaming performance - Google Patents
A kind of hot rolling acid-cleaning strip and its production method with high reaming performance Download PDFInfo
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- CN108998739A CN108998739A CN201810861295.XA CN201810861295A CN108998739A CN 108998739 A CN108998739 A CN 108998739A CN 201810861295 A CN201810861295 A CN 201810861295A CN 108998739 A CN108998739 A CN 108998739A
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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
- 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
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
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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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses hot rolling acid-cleaning strip and its production method that a kind of low cost has high reaming performance, material chemical component mass percents (%) are as follows: C 0.05~0.1%；Si 0.1-0.7%；Mn 0.9~1.6%；P≤0.02%；S≤0.015%；Nb 0.01~0.05%；Al 0.01~0.07%；RE 0.002-0.05%；Remaining is Fe and inevitable impurity.The production method of the hot rolling acid-cleaning strip with high reaming performance includes: molten iron pretreatment, converter smelting, refining, continuous casting, hot rolling, smooth and pickling.The strip microscopic metallographic structure that the present invention produces is ferrite+bainite, and wherein volume ratio 10~20% shared by bainite structure, the strip tensile strength >=590MPa, hole expansibility λ >=95% have excellent strip surface quality.
Description
Technical field
The present invention relates to hot rolling acid-cleaning strips and its production method that a kind of low cost has high reaming performance, belong to hot rolling
Pickled steel strip technical field of producing.
Background technique
Hot rolling acid-cleaning product is the intermediate product between cold rolling and hot rolling, it has the surface quality close to cold plate, together
When remain the mechanical property of hot-rolled product, application range is very extensive, there is preferable market prospects.With common hot rolled plate phase
Than hot rolling acid-cleaning plate eliminates scale on surface, improves the surface quality of steel, replaces cold-reduced sheet with acid-cleaning plate, can be with
Cost is significantly reduced for enterprise, is widely used for manufacture automotive body structure part, chassis system etc. at present.And with garage
The development of industry, auto industry are higher and higher to the cost-effectiveness requirement of lightweight, safety, reduction cost control and fuel oil, using height
Strength steel and advanced high-strength steel are to adapt to the inexorable trend of automobile industry development.
The high reaming steel of hot rolling acid-cleaning is as a steel grade in advanced high-strength steel (AHSS), with traditional low-alloy high-strength
Degree, ferrito-martensite dual phase steel are compared, and with its high-intensitive, high reaming performance, are widely used for manufacture automobile spoke, bottom
The structural members such as the various frames of disk, car body.
Compared with traditional material Hi-Stren steel, ferrito-martensite dual phase steel, hot-rolled ferrite-bainite strip
Since two-phase (ferrite, bainite) difference of hardness is smaller in matrix, so that its cooperation with good cold formability, good
Good reaming performance and fatigue behaviour.
And in the existing high reaming steel production technology of hot rolling acid-cleaning, it is difficult to obtain higher hole expansibility and excellent belt steel surface
Quality.Such as the C when component system content high level, P element are unfavorable for strip due to more carbide and crystal boundary P segregation
Reaming performance, and higher Si content leads to fayalite (2FeO-SiO2) iron scale formation and be difficult to remove, it is difficult to
Obtain the hot rolling acid-cleaning strip of higher level surface quality.
For S element as harmful element, the field trash MnS generated seriously affects hole expansibility.In numerous steel mill's actual productions
In the process, S≤0.006% can be realized by refining procedures such as LF, LF+RH, it is unfavorable to hole expansibility with the S content for eliminating excessively high
It influences.This patent component system introduces rare earth elements RE, optimizes field trash MnS form, improves product hole expansibility, reaches S content
≤ 0.006% horizontal hole expansibility.By the method, high reaming steel can be significantly reduced to product S content requirement, can by it is lower at
This refining procedure realizes production.
Summary of the invention
The present invention is intended to provide it is a kind of can improve hole expansibility and excellent strip surface quality with high reaming performance
Hot rolling acid-cleaning strip and its production method.
The present invention relates to a kind of hot rolling acid-cleaning strip with high reaming performance, material chemical component mass percents
(%) are as follows: C 0.05~0.1%；Si 0.1-0.7%；Mn 0.9~1.6%；P≤0.02%；S≤0.015%；Nb 0.01
~0.05%；Al 0.01~0.07%；RE 0.002-0.05%；Remaining is Fe and inevitable impurity.
On the other hand, the invention further relates to a kind of production method of above-mentioned hot rolling acid-cleaning strip with high reaming performance,
Include:
(1) after pre-processing molten iron, continuous casting obtains slab after converter smelting, refining obtain the molten steel of mentioned component；
(2) after being heated the slab, hot rolled plate is obtained using roughing, finish rolling；
(3) hot rolled plate is cooled down stage by stage, coils into hot rolled coil after cooling；
(4) hot rolled coil is obtained into finished product after flattened, pickling.
The detailed description of the invention
The present invention provides a kind of hot rolling acid-cleaning strip with high reaming performance, material chemical component mass percents
(%) are as follows: C 0.05~0.1%；Si 0.1-0.7%；Mn 0.9~1.6%；P≤0.02%；S≤0.015%；Nb 0.01
~0.05%；Al 0.01~0.07%；RE 0.002-0.05%；Remaining is Fe and inevitable impurity.
It is the effect and its restriction explanation of main component according to the present invention below:
Carbon: carbon is Ovshinsky element of volume, and it is shadow that the height of carbon content, which largely determines the tensile strength rank of steel plate,
Ring the critically important index of carbon equivalent.By the content control of C element 0.05~0.1% in the present invention, under guaranteeing that steel grade is high-intensitive
Can high toughening, but also with good forming and welding performance.
Manganese: postponing perlitic transformation using manganese in the present invention, improves the harden ability of steel and reduces bainite transformation temperature, makes
The sub-structure of steel refines.Therefore, the present invention uses 0.8~1.2% Mn content, in the premise for ensureing product tensile strength
Under, while there is good formability.
Rare earth element: rare earth elements RE can optimize field trash MnS form, improve product hole expansibility, and the present invention is by RE content
It is limited to 0.002-0.05%.
Niobium: the present invention promotes the refined crystalline strengthening of ferrite crystal grain using microalloy element niobium, helps to reduce bainite/iron
Intensity difference between ferritic matrix, so as to improve the stretch flangeability of steel.The content control of Nb element is existed in the present invention
0.01~0.05%.
Aluminium: aluminium is nitride forming element, is mainly used to fix the nitrogen in steel, advantageous to the aging performance for improving steel.This
Al content is limited to 0.01~0.07% by invention.
Silicon: silicon has certain invigoration effect but deteriorates corrosion resistance, and Si content is limited to 0.3-1.0%, is used to by the present invention
Promote the degree of purity in ferrite matrix.
Phosphorus: phosphorus is generally solid-solubilized in ferrite in steel, there is very strong solution strengthening effect, for improving the intensity of steel, drop
The toughness of low steel, but the P of too high amount is unfavorable to welding performance, is harmful element, therefore phosphorus content should be reduced to the greatest extent, in the present invention
Content≤0.02% of P.
Sulphur: sulfur content and the form of sulfide are to influence the principal element of formability, and the quantity of sulfide is more, and size is got over
Greatly, more unfavorable to reaming performance performance, therefore the practical controlled level of product S content is not limited strictly in the present invention, this hair
Bright middle S content≤0.015%.
The internal microstructure of hot rolling acid-cleaning strip of the present invention is ferrite+bainite.
Further, the internal microstructure of the hot rolling acid-cleaning strip is 80-90% ferrite and 10- by volume fraction
20% bainite composition.The organization type of the ratio can guarantee the hot rolling acid-cleaning strip tensile strength >=590MPa, hole expansibility λ
>=95%, have excellent strip surface quality.
In the present patent application, the elements such as C, Si, Mn are strong by solution strengthening effect raising strip yield strength, tension
Degree；Nb element is strong by yield strength, the tension that solution strengthening, refined crystalline strengthening and precipitation strength effect further promote product
Degree, and improve elongation percentage and hole expansibility；Rare earth elements RE, which mainly passes through, improves field trash type to promote product hole expansibility.With
Upper element comprehensive function guarantees that the performance of material meets the requirement of standard.
The present invention also provides a kind of production methods of hot rolling acid-cleaning strip with high reaming performance, comprising:
(1) after pre-processing molten iron, continuous casting obtains slab after converter smelting, refining obtain the molten steel of mentioned component；
(2) after being heated the slab, hot rolled plate is obtained using roughing, finish rolling；
(3) hot rolled plate is cooled down stage by stage, coils into hot rolled coil after cooling；
(4) hot rolled coil is obtained into finished product after flattened, pickling.
The production method of the hot rolling acid-cleaning strip according to the present invention uses constant speed in the finish rolling in step (2)
Rolling, hot rolled plate thickness specification variation range control in 1.8~5.5mm, mill speed because of thickness change, control 5~
11m/s.The variation of mill speed mainly guarantees to guarantee that strip passes through milling train, by finish rolling entrance under target temperature point
It is fixed that the difference of temperature and finishing temperature is come.It is the stabilization for guaranteeing air cooling time when constant speed rolling, it is air-cooled if not using constant speed
Time is difficult to control, and is unfavorable for later period structure stability, influences hole expansibility.
The production method of the hot rolling acid-cleaning strip according to the present invention, in step (2), the roughing final temperature control
It is 1000~1080 DEG C, the finish rolling final temperature control is 830~890 DEG C.Temperature is excessively high to be easily formed acicular ferrite, modeling
Property is poor；And the ferrite crystal grain or entrance γ+α two-phase section of the too low elongation then easy to form of temperature.By roughing final temperature control
System is at 1000~1080 DEG C, and for the control of finish rolling final temperature at 820~900 DEG C, it is good which can guarantee that steel plate has
Intensity and elongation percentage matching.
The production method of the hot rolling acid-cleaning strip according to the present invention, in step (3), the cooling stage by stage includes will
The hot rolled plate is first quickly cooled to 600~680 DEG C, then carries out the air-cooled of 5~10s again, finally carry out again water cooling to 400~
500℃.600~680 DEG C of quick forming core areas for ferrite (α) phase are quickly cooled to the shape that the temperature spot is conducive to ferritic phase
Core, and the air cooling time of 5~10S guarantee ferritic phase have the enough time of growing up, 400~500 DEG C of cooling temperatures be in order to
Bainite structure is formed, temperature is excessively high to be easily formed pearlite, and the too low martensite etc. that is easily formed is organized.
The hot rolled coil is first cooled to by the production method of the hot rolling acid-cleaning strip according to the present invention in step (4)
Then room temperature carries out smooth again, smooth elongation control is 1~3%.
The production method of the hot rolling acid-cleaning strip according to the present invention, the hot rolling in step (4), after smooth
Speed of service when volume carries out pickling is controlled in 60~100m/min.Pickling speed is too low to easily cause overpickling, excessive velocities
Deficient pickling is easily caused, is not able to satisfy FB grades of surface quality requirements of belt steel surface.
Further, the control of the last one descaling bath pickling temperature is 80~90 DEG C, iron concentration control in acid cleaning process
It is made as 30~40g/L, so that the strip of production department meets surface FB grades of surface quality requirements.
Hot rolling acid-cleaning strip and its production method provided by the invention with high reaming performance, by chemical component
Control and rolling, the control of acid cleaning process parameter, so that be ferrite+bainite at the strip microscopic metallographic structure that output is come,
Wherein volume ratio 10~20% shared by bainite structure, the strip tensile strength >=590MPa, hole expansibility λ >=95% have excellent
Different strip surface quality.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Embodiment 1
The embodiment of the invention provides a kind of hot rolling acid-cleaning strips with high reaming performance, and chemical component is according to weight
Percentage is calculated as: C 0.07%, Si 0.3%, Mn 1.2%, P 0.012%, S 0.012%, Nb 0.03%, Al
0.05%, RE 0.05%, remaining is Fe and inevitable impurity.
Its production method includes: molten iron pretreatment, converter smelting, refining, continuous casting, hot rolling, smooth and pickling.Wherein, slightly
Rolling final temperature control is 1040 DEG C, and the control of finish rolling final temperature is 860 DEG C；Constant speed rolling, roughing are used in roughing, finish rolling
Speed control is controlled in 5m/s, finish rolling mill speed in 10m/s；Using cooling technique stage by stage after rolling, the hot rolled plate after finish rolling
620 DEG C are quickly cooled to the cooling rate of 80 DEG C/S, then carries out the air-cooled of 7s again, water cooling is finally carried out to 410 with 90 DEG C/S again
℃.The strip that will be cooled to room temperature carries out smooth, control strip elongation percentage 1.5%.The pickling of shallow slot turbulent flow type, band are used when pickling
Steel speed of service 80m/min, and control 5# descaling bath (the last one descaling bath) pickling temperature is 85 DEG C, iron concentration is
34g/L.After pickling belt steel surface color be canescence, using drying, after batching, packing after two-sided electrostatic painting anticorrosive oil at
For finished product, the hot rolling acid-cleaning strip with high reaming performance is produced.
The strip microscopic metallographic structure that the present embodiment final production comes out is ferrite+bainite, wherein bainite structure
Shared volume ratio is 15%, which is 600MPa, and hole expansibility λ is 100%, and surface quality is FB grades.
Embodiment 2
The embodiment of the invention provides a kind of hot rolling acid-cleaning strips with high reaming performance, and chemical component is according to weight
Percentage is calculated as: C 0.09%, Si 0.3%, Mn 1.5%, P 0.015%, S 0.015%, Nb 0.015%, Al
0.04%, RE 0.002%, remaining is Fe and inevitable impurity.
Its production method includes: molten iron pretreatment, converter smelting, refining, continuous casting, hot rolling, smooth and pickling.Wherein, slightly
Rolling final temperature control is 1000 DEG C, and the control of finish rolling final temperature is 840 DEG C；Constant speed rolling, roughing are used in roughing, finish rolling
Speed control is controlled in 8m/s, finish rolling mill speed in 11m/s；Using cooling technique stage by stage after rolling, the hot rolled plate after finish rolling
610 DEG C are quickly cooled to the cooling rate of 90 DEG C/S, then carries out the air-cooled of 6s again, water cooling is finally carried out to 430 with 80 DEG C/S again
℃.The strip that will be cooled to room temperature carries out smooth, control strip elongation percentage 1.8%.The pickling of shallow slot turbulent flow type, band are used when pickling
Steel speed of service 90m/min, and control 5# descaling bath pickling temperature is 82 DEG C, iron concentration 36g/L.Strip table after pickling
Face color is canescence, using drying, becomes finished product after batching, packing after two-sided electrostatic painting anticorrosive oil, producing has
The hot rolling acid-cleaning strip of high reaming performance.
The strip microscopic metallographic structure that the present embodiment final production comes out is ferrite+bainite, wherein bainite structure
Shared volume ratio is 12%, which is 595MPa, and hole expansibility λ is 105%, and surface quality is FB grades.
Embodiment 3
The embodiment of the invention provides a kind of hot rolling acid-cleaning strips with high reaming performance, and chemical component is according to weight
Percentage is calculated as: C 0.06%, Si 0.6%, Mn 1.2%, P 0.01%, S 0.015%, Nb 0.04%, Al 0.03%,
RE 0.02%, remaining is Fe and inevitable impurity.
Its production method includes: molten iron pretreatment, converter smelting, refining, continuous casting, hot rolling, smooth and pickling.Wherein, slightly
Rolling final temperature control is 1020 DEG C, and the control of finish rolling final temperature is 850 DEG C；Constant speed rolling, roughing are used in roughing, finish rolling
Speed control is controlled in 6m/s, finish rolling mill speed in 9m/s；Using cooling technique stage by stage after rolling, hot rolled plate after finish rolling with
The cooling rate of 68 DEG C/S is quickly cooled to 670 DEG C, then carries out the air-cooled of 8s again, finally carries out water cooling to 480 DEG C with 70 DEG C/S again.
The strip that will be cooled to room temperature carries out smooth, control strip elongation percentage 2.0%.The pickling of shallow slot turbulent flow type, strip are used when pickling
Speed of service 70m/min, and control 5# descaling bath pickling temperature is 88 DEG C, iron concentration 39g/L.Belt steel surface after pickling
Color is canescence, using drying, becomes finished product after batching, packing after two-sided electrostatic painting anticorrosive oil, producing has height
The hot rolling acid-cleaning strip of reaming performance.
The strip microscopic metallographic structure that the present embodiment final production comes out is ferrite+bainite, wherein bainite structure
Shared volume ratio is 12%, which is 600MPa, and hole expansibility λ is 98%, and surface quality is FB grades.
Embodiment 4
The embodiment of the invention provides a kind of hot rolling acid-cleaning strips with high reaming performance, and chemical component is according to weight
Percentage is calculated as: C 0.08%, Si 0.3%, Mn 1.1%, P 0.008%, S 0.012%, Nb 0.05%, Al
0.02%, RE 0.015%, remaining is Fe and inevitable impurity.
Its production method includes: molten iron pretreatment, converter smelting, refining, continuous casting, hot rolling, smooth and pickling.Wherein, slightly
Rolling final temperature control is 1060 DEG C, and the control of finish rolling final temperature is 870 DEG C；Constant speed rolling, roughing are used in roughing, finish rolling
Speed control is controlled in 7m/s, finish rolling mill speed in 10.5m/s；Using cooling technique stage by stage after rolling, the hot rolling after finish rolling
Plate is quickly cooled to 630 DEG C with the cooling rate of 85 DEG C/S, then carries out the air-cooled of 9s again, finally carries out water cooling extremely with 65 DEG C/S again
490℃.The strip that will be cooled to room temperature carries out smooth, control strip elongation percentage 2.5%.Using shallow slot turbulent flow type acid when pickling
It washes, strip speed 68m/min, and control 5# descaling bath pickling temperature is 84 DEG C, iron concentration 37g/L.After pickling
Belt steel surface color is canescence, using drying, becomes finished product, production after batching, packing after two-sided electrostatic painting anticorrosive oil
Provide the hot rolling acid-cleaning strip of high reaming performance.
The strip microscopic metallographic structure that the present embodiment final production comes out is ferrite+bainite, wherein bainite structure
Shared volume ratio is 18%, which is 605MPa, and hole expansibility λ is 100%, and surface quality is FB grades.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these modification and variations and exists
It is interior.
Claims (10)
1. a kind of hot rolling acid-cleaning strip with high reaming performance, material chemical component mass percent (%) are as follows: C 0.05
~0.1%；Si 0.1-0.7%；Mn 0.9~1.6%；P≤0.02%；S≤0.015%；Nb 0.01~0.05%；Al
0.01~0.07%；RE 0.002-0.05%；Remaining is Fe and inevitable impurity.
2. hot rolling acid-cleaning strip as described in claim 1, which is characterized in that the internal microstructure of the hot rolling acid-cleaning strip
For ferrite+bainite.
3. hot rolling acid-cleaning strip as claimed in claim 2, which is characterized in that the internal microstructure of the hot rolling acid-cleaning strip
It is that 80-90% ferrite and 10-20% bainite form by volume fraction.
4. a kind of production method of the hot rolling acid-cleaning strip with high reaming performance as described in claim 1, comprising:
(1) after pre-processing molten iron, continuous casting obtains slab after converter smelting, refining obtain the molten steel of mentioned component；
(2) after being heated the slab, hot rolled plate is obtained using roughing, finish rolling；
(3) hot rolled plate is cooled down stage by stage, coils into hot rolled coil after cooling；
(4) hot rolled coil is obtained into finished product after flattened, pickling.
5. hot rolling acid-cleaning strip production method as claimed in claim 4, which is characterized in that in step (2), in the finish rolling
Shi Caiyong constant speed rolling, hot rolled plate thickness specification variation range control in 1.8~5.5mm, mill speed because of thickness change,
Control is in 5~11m/s.
6. hot rolling acid-cleaning strip production method as claimed in claim 4, which is characterized in that in step (2), the roughing is whole
Only temperature control is 1000~1080 DEG C, and the finish rolling final temperature control is 830~890 DEG C.
7. hot rolling acid-cleaning strip production method as claimed in claim 4, which is characterized in that in step (3), it is described stage by stage
Cooling includes that the hot rolled plate is first quickly cooled to 600~680 DEG C, then carries out the air-cooled of 5~10s again, is finally carried out again
Water cooling is to 400~500 DEG C.
8. hot rolling acid-cleaning strip production method as claimed in claim 4, which is characterized in that in step (4), first by the heat
It rolls volume to be cooled to room temperature and then carry out again smooth, smooth elongation control is 1~3%.
9. hot rolling acid-cleaning strip production method as claimed in claim 4, which is characterized in that the hot rolled coil after smooth
Speed of service when pickling is carried out to control in 60~100m/min.
10. hot rolling acid-cleaning strip production method as claimed in claim 9, which is characterized in that last in the acid cleaning process
A descaling bath pickling temperature control is 80~90 DEG C, iron concentration control is 30~40g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861295.XA CN108998739B (en) | 2018-08-01 | 2018-08-01 | Hot-rolled pickled strip steel with high hole expanding performance and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861295.XA CN108998739B (en) | 2018-08-01 | 2018-08-01 | Hot-rolled pickled strip steel with high hole expanding performance and production method thereof |
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| CN108998739A true CN108998739A (en) | 2018-12-14 |
| CN108998739B CN108998739B (en) | 2020-12-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109536845A (en) * | 2019-02-01 | 2019-03-29 | 本钢板材股份有限公司 | A kind of tensile strength 590MPa grades of wheels hot-rolled ferrite-bainite dual-phase steel steel band and preparation method thereof |
| CN109898016A (en) * | 2019-03-01 | 2019-06-18 | 鞍钢股份有限公司 | 500MPa grades or more high reaming hot rolling acid-cleaning steel plate and its manufacturing method |
| CN111519107A (en) * | 2020-06-03 | 2020-08-11 | 首钢集团有限公司 | Hot-rolled and acid-washed low-alloy high-strength steel with enhanced hole expanding performance and production method thereof |
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| CN114107798A (en) * | 2020-08-31 | 2022-03-01 | 宝山钢铁股份有限公司 | 980 MPa-grade bainite high-reaming steel and manufacturing method thereof |
| CN112195404A (en) * | 2020-09-28 | 2021-01-08 | 首钢集团有限公司 | 700MPa grade boron-containing steel for automobile torsion beam and preparation method thereof |
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