CN110484827A - A kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates - Google Patents
A kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates Download PDFInfo
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- CN110484827A CN110484827A CN201810257000.8A CN201810257000A CN110484827A CN 110484827 A CN110484827 A CN 110484827A CN 201810257000 A CN201810257000 A CN 201810257000A CN 110484827 A CN110484827 A CN 110484827A
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- rolling acid
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- cleaning steel
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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
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention discloses a kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates, the punching performance and reaming performance for mainly solving existing 600MPa grades of hot rolling acid-cleaning steel plate mismatch, are not able to satisfy the technical issues of complicated shape auto parts and components manufacture demand.Hot rolling acid-cleaning steel plate provided by the invention, its chemical component weight percentage are as follows: C:0.06~0.08%, Mn:0.8~1.2%, Si:0~0.10%, P:0~0.020%, S:0~0.006%, Alt:0.015~0.050%, N:0~0.005%, Ti:0.03~0.05%, surplus are Fe and inevitable impurity element.Yield tensile ratio≤0.80 of the present invention 2.0~4.0mm thickness hot rolling acid-cleaning steel plate, elongation after fracture A50mmIt is 25~35%, reaming performance λ >=75%.Steel plate of the present invention makes for automobile structure.
Description
Technical field
The present invention relates to a kind of hot rolling acid-cleaning steel plate, in particular to a kind of tensile strength 600MPa grades of low yield strength ratios hot rolling acid
Steel plate and its manufacturing method are washed, steel plate of the present invention has good stamping performance and reaming performance, meets the manufacture of auto parts and components
Demand belongs to technical field of iron-base alloy.
Background technique
Hot rolling acid-cleaning automobile structural steel is one kind of hot rolled steel plate, has by pickling processes rear surface quality and mentions greatly very much
It rises, so that steel plate has both the low cost and preferable size, plate shape precision of hot plate, is widely used in the knot such as automobile chassis, wheel
Component.The weight of such structural member accounts for about the 25% of car body weight, therefore automobile industry is more next to the expectation of the high-strength loss of weight of material
It is higher.The decline of bring plasticity is very big on the influence of the formability of part therewith after intensity rank raising, and for equipment pressure
It is increasing, it is unfavorable for punching press, therefore processing enterprise wishes that yield strength is lower for material.Simultaneously because many components
Shape it is more complicated, and a variety of forming requirements are usually had both, such as stampability and hole expandability, as a result, it may also be desirable to which material has
Good combined shaping performance.
Existing tensile strength 600MPa grades of hot rolled steel plate there are two main classes production technology, one is low-alloy high-strength steels
(HSLA), main to be strengthened by Mn and addition Nb, V, Ti element, its advantage is that, manufacturing process is relatively easily realized, insufficient
Place is: yield tensile ratio is high, yield tensile ratio >=0.85；Elongation is low, elongation≤20%；Punching performance is poor, for punching press width
Biggish part is spent to be difficult to meet；Another kind is dual phase steel (DP), main F+M tissue, its advantage is that, yield tensile ratio is low, yield tensile ratio
≤ 0.6, elongation percentage is high, and elongation percentage >=25%, punching performance is superior, the disadvantage is that reaming performance is not high, generally below 50%.
The Chinese patent application file of application publication number CN106834949A disclose a kind of yield strength 500MPa grades it is low
Silicon titaniferous acid-cleaning plate and preparation method thereof, contained chemical component and weight percent are as follows: C:0.06~0.09%, Mn:0.35
~0.80%, Als:0.03~0.06%, Ti:0.07~0.09%, Si≤0.05%, Nb≤0.01%, S≤0.008%, P
≤ 0.015%, N≤0.004%, O≤0.003%, remaining is iron and inevitable impurity.It is prepared through following steps:
-- -- -- -- -- -- section cooling -- batching -- enters hot continuous rolling continuous casting RH application of vacuum the refining of LF furnace ladle argon-blown converter smelting
Continuous pickling line carries out pickling.Its tissue morphology is ferrite+a small amount of carbide+a small amount of pearlite, and grain size number is
11~12 grades, yield strength is 535~550MPa, and tensile strength is 625~645MPa, and elongation percentage is 22~25%, has FB
(02) ratings above strip surface quality and good processing performance.The yield tensile ratio of the program is higher 0.85 or more, is unfavorable for
Punching performance, Ti additive amount is more, Ti cannot such as be dissolved completely it is very big to performance inconsistency, control difficulty it is larger.
The Chinese patent application file of application publication number CN106086627A discloses a kind of 600MPa grades of hot-rolled dual-phase steel,
The chemical component of the dual phase steel is C:0.05~0.07% by weight percent, Si:0.1~0.3%, Mn:1.10~
1.50%, Cr:0.5~0.8%, surplus Fe.The dual phase steel of the invention is ferrite and martensitic structure, and yield strength is
300~375MPa, tensile strength are 590~650MPa, and yield tensile ratio is 0.56~0.60, and percentage of total elongation of having no progeny is 24~30%,
The index for not providing hole expansibility, it is lower from the hole expansibility of program product from the point of view of tissue, it is not suitable for the phase with flanging property
Complicated shape part is used.
The Chinese patent application file of application publication number CN107099739A disclose a kind of tensile strength 600MPa grades it is low
Cost high-chambering steel plate and its production method, the high-chambering steel plate chemical component composition and mass percentage are as follows: C:0.15
~0.20%, Si≤0.30%, Mn:0.80~1.00%, P≤0.020%, S≤0.010%, Als:0.020~0.050%,
Ti:0.010~0.030%, N≤0.0060%, surplus are Fe and inevitable impurity；Its production method includes steel-making, adds
Heat, rolling and cooling process.The invention is led to by obtaining the duplex structure of ferrite and bainite to cooling path clustering
Increase C is crossed to improve intensity, obtains tensile strength 600-650Mpa, lower yield strength 500-550MPa, elongation percentage A50 >=
25%, the hot rolled strip of hole expansibility >=95%.The program is by increasing C content come inexpensive raising intensity, but high C is to plasticity
It is unfavorable, and it is easy to appear banded structure, while also improving yield tensile ratio, it is left from yield tensile ratio 0.85 from the point of view of the embodiment of the program
It is right.
The Chinese patent application file of application publication number CN105220065A discloses a kind of high hole expansibility low yield strength ratio heat
High-strength steel sheet is rolled, microstructure is ferrite+martensite+bainite, the high hole expansibility low yield strength ratio hot-rolled high-strength steel
The chemical element mass percentage of plate are as follows: C:0.02~0.08%；Mn:1.0~2.0%；Al:0.025~0.060%；It is remaining
Amount is Fe and other inevitable impurity.The invention also discloses a kind of high hole expansibility low yield strength ratio hot-rolled high-strength steel plates
Manufacturing method, successively comprising steps of (1) smelts and is cast as slab；(2) it heats；(3) it rolls；(4) sub-sectional cooling；(5) it rolls up
It takes；(6) it is air-cooled to room temperature.The invention is improved on the basis of DP dual phase steel, obtains ferrite+martensite+bainite
Three-phase contexture, the ferrite of compensating for over+bainite structure intensity is insufficient and ferrite+martensite hole expansibility is too low lacks
Point, so that tensile strength >=590MPa, yield tensile ratio≤0.6, hole expansibility >=60%, comprehensive performance are very superior.But from side
From the point of view of case embodiment, in order to promote ferrite to produce in multi-phase Steels, it is big to reach 1.0%, Si content for Si content in the component system
Will be than more serious in the red iron sheet of 0.5% surface of steel plate, the part high for surface quality requirements is beyond affordability.In addition, for double
(3) for phase steel, the phase composition in tissue is controlled by two-part section cooling, is difficult to realize tissue high-precision and performance
Stablize, therefore it is larger to produce control difficulty.
As automobile industry processing efficiency improves, the demand that part is integrated, process shortens increasingly increases, high-strength, shape is multiple
Miscellaneous part processing will be more and more, and therefore, the hot rolling acid-cleaning steel plate for having both high-intensitive, good stamping performance and reaming performance will
With the bigger market demand.
Summary of the invention
The object of the present invention is to provide a kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates and its manufacturers
Method, the punching performance and reaming performance for mainly solving existing 600MPa grades of hot rolling acid-cleaning steel plate mismatch, are not able to satisfy complex shape
Shape auto parts and components manufacture the technical issues of demand.Hot rolling acid-cleaning steel plate of the present invention has good stamping performance and reaming performance,
Surface quality is good, meets the manufacture demand of complicated shape auto parts and components, meets automobile automobile structure lightweight need
It asks.
Mentality of designing of the invention is, using ferrite+a small amount of pearlite+diffusion carbide organization design, reaming performance
Preferably, refined crystalline strengthening effect is suitably weakened on this basis, is promoted precipitating reinforcing effect and is integrated reduction using straightening technique
Yield tensile ratio improves its punching performance.
The technical solution adopted by the present invention is that a kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates, change
Learn composition by weight percent are as follows: C:0.06~0.08%, Mn:0.8~1.2%, Si:0~0.10%, P:0~0.020%, S:0
~0.006%, Alt:0.015~0.050%, N:0~0.005%, Ti:0.03~0.05%, surplus is for Fe and unavoidably
Impurity element.
The metallographic structure of hot rolling acid-cleaning steel plate of the present invention is ferrite+a small amount of pearlite+disperse titanium carbide granule, the gold
The volume content of phase constitution medium pearlite is 5~8%, and ferritic grain size is 10.5~11.5 grades；The thick heat of 2.0~4.0mm
Roll the yield strength R of pickled platep0.2For 460~520MPa, tensile strength RmFor 600~660MPa, yield tensile ratio≤0.80 is broken
Elongation A afterwards50mmIt is 25~35%, reaming performance λ >=75%.
The chemical component of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates of the present invention is limited to above-mentioned
Reason in range is as follows:
Carbon: carbon is the most effective element for improving the intensity of steel.The present invention uses low-carbon design route, when C content is higher than
When 0.085%, steel-making enters peritectoid area, and slab quality, which is difficult to control, the defects of slag, while steel medium pearlite content easily occurs
Increase, the plasticity and toughness and welding performance of steel are deteriorated；When C amount is lower than 0.06%, the intensity of steel is difficult to ensure.To guarantee the steel
Obdurability and welding performance, the C content that the present invention is set is 0.06~0.08%.
Silicon: silicon is as harmful element, and silicone content height damages plasticity, and silicone content height is easy to produce surface red iron sheet, influences
Surface quality, Si≤0.1% that the present invention is set.
Manganese: manganese is deoxidant element, and large-sized field trash is in removal steel to guarantee degree of purity in steel, while manganese is formed with sulphur
Manganese sulfide can avoid FeS to the adverse effect of plasticity.Manganese has a solution strengthening effect to Steel Properties, can also fining ferrite grains,
Manganese content is reduced as far as possible on the basis of keeping and being several times as much as the content of sulphur, advantageously reduces cost of alloy, and reduce the strength of materials and mention
High formability.Compared to refined crystalline strengthening mode and precipitation strength mode, the rate that solution strengthening mode improves yield tensile ratio is minimum, because
This is most advantageous to acquisition low yield strength ratio come proof strength with solution strengthening, but it is inclined to increase the tissue in steel when Mn too high levels
Analysis, influences the structural homogenity and impact property of steel, also will affect welding performance.Therefore, Mn content is controlled 0.8 in the present invention
~1.2%.
Phosphorus: P is the harmful element in steel, easily causes serious segregation, reduces the toughness of steel plate, leads to that brittle failure occurs.
In addition, excessively high P content will significantly reduce the welding performance of steel, removal generally should give.Therefore, in the present invention, control P≤
0.020%.
Sulphur: S is the harmful element in steel, and the elements such as Mn form sulphide inculsion and microstructure segregation in Yi Yugang, is reduced
The intensity and toughness of steel deteriorate fatigue and welding performance, should reduce its content as far as possible.Therefore, the control of S content exists in the present invention
0.006% or less.
Titanium: Ti is a kind of strong carbonitride-forming elements, and carbon, the nitride particles Precipitation in ferrite can be effective
Improve the intensity of ferrite matrix.The setting of Ti alloy content will consider cost and required intensity, when Ti is lower than 0.03%
When, precipitating reinforcing effect is inadequate, and when more than 0.05%, superfluous Ti can deteriorate the toughness of steel.Therefore, Ti content control in the present invention
System is 0.03~0.05%.
Nitrogen: nitrogen and carbon phase are when being interstitial atom, and in order to which the formability needs of steel are fixed, N and Ti are at high temperature
Solidification, the TiN of bulky grain easy to form in continuous casting, the waste for causing Ti alloy and the disperse educt for influencing subsequent Ti are strengthened.
Therefore the content of nitrogen need to be limited, the present invention controls N≤0.005%.
The manufacturing method of above-mentioned tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates, this method comprises:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the weight percent of the ladle chemistry are as follows: and C:0.06~
0.08%, Mn:0.8~1.2%, Si:0~0.10%, P:0~0.020%, S:0~0.006%, Alt:0.015~
0.050%, N:0~0.005%, Ti:0.03~0.05%, surplus are Fe and inevitable impurity element；
The heated stove heating of continuous casting steel billet is that two-part rolls work to hot rolling, the hot rolling is carried out after 1200~1250 DEG C
Skill, roughing are 5 passage tandem rollings, are rolled more than austenite recrystallization temperature, and roughing end temp is 1030~1050 DEG C；Finish rolling
For 7 passage tandem rollings, finish rolling is rolled in austenite Unhydrated cement, and it is 850~880 DEG C that finish rolling, which terminates temperature, and finish rolling reduction ratio is
85~95%, after finish rolling, control steel plate thickness is 2.0~4.0mm, and section cooling is cooling using leading portion, coiling temperature for 580~
It batches to obtain coils of hot-rolled steel at 620 DEG C；
Coils of hot-rolled steel uncoiling again on uncoiler batches to obtain finished product hot rolling acid-cleaning steel plate through straightening, pickling, described
Straightening elongation percentage is 0.40~0.60%.
The reasons why production technology that the present invention takes, is as follows:
1, the setting of continuous casting steel billet heating temperature
It is added to Ti expectation in the design of this ingredient and obtains dispersed and tiny Secondary phase particle, and TiN, Ti4C2S2Because fusing point height exists
Bulky grain is generated and be gathered into continuous casting process, need to enable the Secondary phase particle of bulky grain using higher slab heating temperature
Substrate disperse educt again is enough reintegrated, therefore, the present invention sets continuous casting steel billet heating temperature as 1200~1250 DEG C.
2, the setting of roughing end temp
In rough rolling process, to make crystal grain carry out Recovery and recrystallization, roughing end temp should be higher than that the austenite of the steel again
Crystallization temperature, the austenite recrystallization temperature of the steel are about 930 DEG C, and in order to which subsequent finish rolling can be realized austenitic area rolling,
Roughing end temp cannot be too low, but roughing end temp cannot be too high, otherwise must improve the heating temperature of continuous casting steel billet, increases
Add energy consumption.Therefore, roughing end temp is set as 1030~1050 DEG C.
3, finish rolling terminates the setting of temperature
To prevent finish rolling from rolling in two-phase section, there is mixed grain structure, finishing temperature need to be higher than Ar3Transformation temperature, the A of the steelr3
Transformation temperature is 840 DEG C.In addition, finishing temperature can be slightly higher to obtain relatively large-sized crystal grain, but temperature it is excessively high so that
Coarse grains are unfavorable for punching performance.Therefore, the present invention, which sets finish rolling, terminates temperature as 850~880 DEG C.
4, the setting of section cooling mode and hot-rolling coiling temperature
Hot-rolling coiling temperature is one of the key factor for influencing mechanical performance, TiC particle Precipitation Temperature it is lower about 580~
Between 900 DEG C, therefore section cooling and hot-rolling coiling temperature are very big on TiC precipitation influence.Coiling temperature is excessively high, and crystal grain is grown up very
Fastly, intensity decline is excessive；Coiling temperature is too low, and precipitating reinforcing effect fails to embody.Therefore, section cooling and coiling temperature are set
Surely to comprehensively consider the effect of crystallite dimension and precipitation strength, therefore the present invention takes the leading portion type of cooling, and sets hot rolling reeling
Temperature is 580~620 DEG C.
5, the setting of straightening elongation percentage
Originally there are three function, one is to provide mechanical external force destroys between hotplate surface iron scale and matrix tool for straightening
In conjunction with realization scale breading effect improves the efficiency of subsequent acid solution removal iron scale；Second is that making original by alternating bending and aligning
This extends the biggish steel plate of inconsistent or residual stress and realizes that extending consistent or reduction remnants answers by micro plastic deformation
Power, to achieve the effect that improve plate shape；Third is that applying micro plastic deformation to steel plate by straightening, yield point elongation is eliminated, with
The defects of eliminating the skid wire that piece surface is likely to occur in punching course.By the extensive work of the applicant, straightening is found
There is also large effects, not only elimination yield point elongation for performance of the technique to hot rolled steel plate, also have to yield strength very big
It influences.Steel plate yield strength is found by the experimental work of the applicant for the low-carbon micro steel-alloy component system of this programme
Rp0.2There is the relationship such as attached drawing 2 with straightening elongation percentage, principle mainly passes through certain small deformation, originally pinned position
The de- nail of mistake becomes mobile dislocation, promotes dislocation movement by slip, and the entanglement of dislocation fast breeding then will lead to cunning after being plastically deformed increase
Difficult, yield strength is moved to increase.Therefore, the present invention sets straightening elongation percentage as 0.40-0.60%, and it is strong to can get minimum surrender
Degree, and tensile strength and elongation are influenced little.
The hot rolling acid-cleaning steel plate of the method for the present invention production, metallographic structure are ferrite+a small amount of pearlite+disperse titanium carbide
Particle, the volume content of the metallographic structure medium pearlite are 5~8%, and ferritic grain size is 10.5~11.5 grades；2.0
The yield strength R of~4.0mm thickness hot rolling acid-cleaning steel platep0.2For 460~520MPa, tensile strength RmFor 600~660MPa, Qu Qiang
Than≤0.80, elongation after fracture A50mmIt is 25~35%, reaming performance λ >=75%.
The present invention is designed by using suitable component, hot rolling technology and acid cleaning process design, and obtains ideal metallographic group
It knits, steel plate, with excellent good stamping performance and reaming performance, guarantees user vehicle to multiple while meeting product strength
The requirement of miscellaneous components forming.Vehicle structure components production of the hot rolling acid-cleaning steel plate of the present invention for complicated forming.
The present invention has following good effect compared with prior art: 1, the present invention is using ferrite and a small amount of pearlite
And the matrix of diffusion carbide, by the cooperation of solution strengthening and precipitation strength, in conjunction with specific straightening technique, in tension
0.80 yield tensile ratio below is obtained on 600MPa grades of hot rolling steel grades, 75% or more hole expansibility has both good punching performance and expansion
Pore performance.2, hot rolling acid-cleaning plate of the invention, compared to the ferritic-pearlitic tissue of conventional ad eundem intensity, yield tensile ratio is low；Phase
Than two-phase (F+M) tissue of ad eundem intensity, hole expansibility is high；Compared to three-phase (F+B+M) tissue of ad eundem intensity, surface quality
Good, easy to produce and performance is stablized.3,600MPa grades of hot rolling acid-cleaning plates of tension of the invention, comprehensive forming property preferably, surface matter
Amount is good, manufacturing cost is low, manufacturing process is easily realized, performance is stablized, the hot rolling acid-cleaning automobile knot suitable for manufacturing complex shapes
Component.
Detailed description of the invention
Attached drawing 1 is the metallographic structure photo of 2 hot rolling acid-cleaning steel plate of the embodiment of the present invention.
Attached drawing 2 is the yield strength of 2 hot rolling acid-cleaning steel plate of the embodiment of the present invention, the data of tensile strength and straightening elongation percentage
Figure.
Specific embodiment
Below with reference to Examples 1 to 5, the present invention will be further described, as shown in 1~table of table 5, it should be understood that following specific
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
Table 1 is the chemical component (by weight percentage) of steel of the embodiment of the present invention, and surplus is Fe and inevitable impurity.
The chemical component of 1 steel of the embodiment of the present invention of table, unit: weight percent.
The molten steel for meeting chemical component requirement is obtained by converter melting, molten steel blows Ar through LF ladle refining furnace refining procedure
Processing, molten steel blow Ar protection continuous casting through whole process and obtain continuous casting steel billet；Continuous casting steel billet is with a thickness of 210~230mm, width
800~1300mm, length are 5000~10000mm.
The scale slab of STEELMAKING PRODUCTION send to heating furnace and reheats, and is sent after dephosphorization of coming out of the stove to rolling on continuous hot tandem rolling mill
System.It by roughing milling train and finish rolling Continuous mill train controlled rolling, is batched after section cooling, section cooling is cold using leading portion
But, output qualification coils of hot-rolled steel；Hot rolled steel plate with a thickness of 2.0~4.0mm.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
The hot rolled steel plate that the present invention is obtained is according to " GB/T228.1-2010 metal material stretching test part 1: room temperature
Test method " tension test is carried out, mechanical property is shown in Table 3.
The mechanical property of 3 hot rolled steel plate of the embodiment of the present invention of table
The uncoiling again on uncoiler by above-mentioned coils of hot-rolled steel batches to obtain finished product hot rolling acid-cleaning steel through straightening, pickling
Plate, the straightening elongation percentage are 0.40-0.60%.Straightening elongation percentage used in the embodiment of the present invention is shown in Table 4.
4 straightening elongation percentage of the embodiment of the present invention of table
| Hot Rolling Parameters | Hot rolling acid-cleaning steel plate thickness/mm | Straightening elongation percentage/% |
| The present invention | 2.0-4.0 | 0.40-0.60 |
| Embodiment 1 | 2.0 | 0.60 |
| Embodiment 2 | 2.5 | 0.55 |
| Embodiment 3 | 3.0 | 0.50 |
| Embodiment 4 | 3.5 | 0.45 |
| Embodiment 5 | 4.0 | 0.40 |
Using hot rolling acid-cleaning steel plate obtained by the above method, referring to Fig. 1 (tissue obtained of embodiment 2), hot rolling acid-cleaning
The metallographic structure of steel plate is ferrite+a small amount of pearlite+disperse titanium carbide granule, and the volume of the metallographic structure medium pearlite contains
Amount is 5~8%, and ferritic grain size is 10.5~11.5 grades；The yield strength of 2.0~4.0mm thickness hot rolling acid-cleaning steel plate
Rp0.2For 460~520MPa, tensile strength RmFor 600~660MPa, yield tensile ratio≤0.80, elongation after fracture A50mmFor 25~
35%, reaming performance λ >=75%.
By the obtained hot rolling acid-cleaning steel plate of the present invention according to " GB/T228.1-2010 metal material stretching test part 1:
Room temperature test method " tension test is carried out, according to " GB/T 24524-2009 metal sheet and strip hole expansion test method "
Hole expansion test is carried out, mechanical property is shown in Table 5.
The mechanical property of 5 hot rolling acid-cleaning steel plate of the embodiment of the present invention of table
Referring to fig. 2, after from table 3 and table 5 as it can be seen that handling by straightening, the yield strength of hot rolled steel plate declines, and resists
Tensile strength slightly improves, and elongation change is little, and yield tensile ratio is reduced to 0.8 or less.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (4)
1. a kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates, chemical component weight percentage are as follows: C:0.06
~0.08%, Mn:0.8~1.2%, Si:0~0.10%, P:0~0.020%, S:0~0.010%, Alt:0.015~
0.050%, N:0~0.005%, Ti:0.03~0.05%, surplus are Fe and inevitable impurity element；Hot rolling acid-cleaning steel
The metallographic structure of plate is ferrite+a small amount of pearlite+disperse titanium carbide granule, the volume content of the metallographic structure medium pearlite
It is 5~8%, ferritic grain size is 10.5~11.5 grades.
2. tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates as described in claim 1, characterized in that 2.0~
4.0mm the yield strength R of thick hot rolling acid-cleaning steel platep0.2For 460~520MPa, tensile strength RmFor 600~660MPa, yield tensile ratio
≤ 0.80, elongation after fracture A50mmIt is 25~35%, reaming performance λ >=75%.
3. a kind of manufacturing method of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates, characterized in that including following step
It is rapid:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the weight percent of the ladle chemistry are as follows: C:0.06~0.08%,
Mn:0.8~1.2%, Si:0~0.10%, P:0~0.020%, S:0~0.006%, Alt:0.015~0.050%, N:0~
0.005%, Ti:0.03~0.05%, surplus are Fe and inevitable impurity element；
The heated stove heating of continuous casting steel billet is two-part rolling mill practice to hot rolling, the hot rolling is carried out after 1200~1250 DEG C,
Roughing is 5 passage tandem rollings, is rolled more than austenite recrystallization temperature, and roughing end temp is 1030~1050 DEG C；Finish rolling is 7
Passage tandem rolling, finish rolling austenite Unhydrated cement roll, finish rolling terminate temperature be 850~880 DEG C, finish rolling reduction ratio be 85~
95%, after finish rolling, section cooling is cooling using leading portion, and coiling temperature batches to obtain coils of hot-rolled steel when being 580~620 DEG C；
Coils of hot-rolled steel uncoiling again on uncoiler batches to obtain finished product hot rolling acid-cleaning steel plate, the straightening through straightening, pickling
Elongation percentage is 0.40~0.60%.
4. the manufacturing method of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates as claimed in claim 3, feature
It is that after finish rolling, control steel plate thickness is 2.0~4.0mm.
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