CN109182672A - A method of producing the economical cold rolling DP590 steel of different yield strength ranks - Google Patents
A method of producing the economical cold rolling DP590 steel of different yield strength ranks Download PDFInfo
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- CN109182672A CN109182672A CN201811259318.6A CN201811259318A CN109182672A CN 109182672 A CN109182672 A CN 109182672A CN 201811259318 A CN201811259318 A CN 201811259318A CN 109182672 A CN109182672 A CN 109182672A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—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
- C22C38/12—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
-
- 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
- C21D2211/008—Martensite
Abstract
The present invention relates to a kind of methods of economical cold rolling DP590 steel for producing different yield strength ranks, the following steps are included: by with a thickness of the steel billet of 230mm, roll process, continuous annealing process and smooth process by heating process, hot-rolled process, acid, 280~330Mpa of preparation covering, 340~400MPa, 420~490 3 kinds of yield strength ranks DP590 steel.The present invention fully considers that iron and steel enterprise is directed to the organization of production feature of small lot cold rolling DP590 steel, it is designed by reasonable, economic, inexpensive ingredient and efficiently controls the key process parameter of each process section, it realizes the cold rolling DP590 steel product that can produce the good 280~330MPa of surface quality, 340~390MPa and 420~480MPa, tri- kinds of yield strength ranks using a kind of component system, can satisfy specific demand of the user to cold-rolled biphase steel product more parts, more performances.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, and in particular to a kind of to produce the economical cold of different yield strength ranks
Roll the method for DP590 steel.
Background technique
The steel of the production theory of Hyundai Motor body structural member non-for production, propose high hole expandability, excellent extension
The different demands of property, easy weldability and the multiple performances such as high intensity and endurance.590MPa grades of dual phase steels are as non-vehicle body knot
The preferred steel of component, not only conform with These characteristics, and it is low in cost, weight loss effect is good, just responsive motor lightweight
Trend, therefore shared ratio in the advanced high-strength steel of automobile remains unchanged maximum, persistently by automobile industry and iron and steel enterprise
Very big concern.
However the features such as small lot existing for automobile cold-rolled two-phase steel product is ordered goods, specification is more, performance requirement diversification,
Inconvenience is brought in actual production tissue to iron and steel enterprise, is mainly manifested in mix and pours base degradation oven improvement height, different steel grades
And specification is frequently excessive, causes the quality stability of two-phase steel product poor.Therefore, exploration low cost is economical, performance is gradable
Not Kong Zhi, the production method of the stable cold rolling DP590 steel of quality, the spy of the more parts of automobile industry, more performances can not only be met
Different demand, and be also the effective measures that competitiveness improves in iron and steel enterprise, become those skilled in the art's technology urgently to be resolved
Problem.
From the point of view of presently disclosed related patents, the above technical problem is not well solved.Existing disclosed skill
Art carries out production method, processing method or manufacturer just for the cold rolling DP590 dual phase steel of a kind of special-purpose and rank
Method illustrates, such as publication number CN 102644021A, CN 102758131A, CN 106011643A, CN 107502819A etc.
Deng.
Summary of the invention
To overcome the deficiency, the economical cold of different yield strength ranks is produced the purpose of the present invention is to provide a kind of
The method for rolling DP590 steel fully considers that iron and steel enterprise is directed to the organization of production feature of small lot cold rolling DP590 steel, by reasonable
, economic, inexpensive ingredient design and efficiently control the key process parameter of each process section, realize using a kind of at fission
It is that can produce the good 280~330MPa of surface quality, 340~390MPa and 420~480MPa, tri- kinds of yield strength ranks
Cold rolling DP590 steel product can satisfy specific demand of the user to cold-rolled biphase steel product more parts, more performances.
The technical solution adopted by the present invention to solve the technical problems is: a kind of economy producing different yield strength ranks
The method of type cold rolling DP590 steel, comprising the following steps: by with a thickness of the steel billet of 230mm, by heating process, hot-rolled process, acid
Process, continuous annealing process and smooth process are rolled, 280~330Mpa of preparation covering, 340~400MPa, 420~490 3 kinds of surrenders are strong
Spend the DP590 steel of rank；
Wherein the chemical component of the steel billet includes following components: C:0.08~0.10% by weight percentage, and Si≤
0.4%, Mn:1.20~1.40%, Alt:0.60~0.80%, Mo:0.20~0.30%, and N≤0.005% is limited, P≤
0.008%, S≤0.005%, surplus are Fe and other inevitable impurity.
Specifically, the thickness specification of the DP590 steel product is 0.8~2.0mm.
Specifically, the steel billet with a thickness of 230mm.
Specifically, in the hot-rolled process, as 2.00mm < hot rolling base-material thickness≤4.00mm, it is thick that roughing exports base
For 35mm, as 4.00mm < hot rolling base-material thickness≤6.00mm, it is 40mm that roughing, which exports base thickness,.
Specifically, the heating process, by heating steel billet, it is 1220~1250 DEG C that bringing-up section temperature, which is arranged, soaking time
For 40min.
Specifically, roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are set by level two in the hot-rolled process
Cover half type calculates, and specific process parameter is seen below:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, roughing outlet temperature 1060~
1090 DEG C, 880~910 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, (not really with~20 DEG C/s
Determine term, it is proposed that write a range) cooling rate be cooled to 670~700 DEG C, batched；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, roughing outlet temperature 1020~
1050 DEG C, 860~890 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, (not really with~20 DEG C/s
Determine term, it is proposed that write a range) cooling rate be cooled to 630~660 DEG C, batched；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, roughing outlet temperature 1020~
1050 DEG C, 810~840 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, with the cooling rate of~20 DEG C/s
550~580 DEG C are cooled to, is batched.
Specifically, the acid rolls in process, and pickling will remove oxide by the coil of strip of hot-rolled process, and technological parameter is shown in
Under:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, using 55.0~60.0%
Drafts carries out cold rolling；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, using 63.0~68.0%
Drafts carries out cold rolling；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, using 65.0~70.0%
Drafts carries out cold rolling.
Specifically, in the continuous annealing process, the steel band after acid to be rolled to process carries out continuous annealing, and technological parameter is seen below:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, soaking temperature is 810~830
DEG C, slow cooling section terminates 650~670 DEG C of temperature, and rapid cooling section terminates 280~300 DEG C of temperature, 270~290 DEG C of overaging section temperature；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, soaking temperature 800~820
DEG C, slow cooling section terminates 670~690 DEG C of temperature, and rapid cooling section terminates 260~280 DEG C of temperature, 250~270 DEG C of overaging section temperature；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, soaking temperature 780~800
DEG C, slow cooling section terminates 670~690 DEG C of temperature, and rapid cooling section terminates 260~280 DEG C of temperature, 250~270 DEG C of overaging section temperature.
Specifically, the smooth elongation control of the DP590 steel is 0.5 ± 0.1%.
The thickness specification of economical cold rolling DP590 steel product with different yield strength ranks is 0.8~2.0mm, is covered
280~330MPa of lid, 340~390MPa and 420~480MPa, tri- kinds of yield strength ranks, surface quality is good, can satisfy
Specific demand of the user to cold rolling DP590 steel product more parts, more performances.
The invention has the following advantages: the present invention fully considers iron and steel enterprise for small lot cold rolling DP590 steel
Organization of production feature designs by reasonable, economic, inexpensive ingredient and efficiently controls the critical process ginseng of each process section
Number, realize using a kind of component system can produce the good 280~330MPa of surface quality, 340~390MPa and 420~
The cold rolling DP590 steel product of tri- kinds of yield strength ranks of 480MPa can satisfy user to more parts of cold-rolled biphase steel product, more
The specific demand of performance.Wherein 280~330MPa yield strength rank DP590 steel is especially suitable for deep processing forming and geometry essence
Spend demanding automobile structure and part inner and outer plates；340~400MPa yield strength rank DP590 steel adds especially suitable for cold
Work forming requirements high automobile structure and reinforcer；420~490MPa yield strength rank DP590 steel is especially suitable for there is expansion
The automobile structure and reinforcer that hole flanging requires.
Detailed description of the invention
Fig. 1 is the microcosmic of 280~330MPa yield strength rank DP590 steel of technique 1-I preparation in the embodiment of the present invention 1
Organization chart；
Fig. 2 is the micro- of 340~400MPa yield strength rank DP590 steel of technique 1-III preparation in the embodiment of the present invention 1
See organization chart；
Fig. 3 is the micro- of 420~490MPa yield strength rank DP590 steel that in the embodiment of the present invention 1 prepared by technique 1- VI
See organization chart.
Specific embodiment
The microstructure of sample and mechanical property performance test are carried out using following method in the embodiment of the present invention:
It is cut into metallographic specimen from cold rolled annealed finished steel coils, 4% nital is used after Yan Mo ﹑ polishing
With Lepera reagent (1:1 is mixed 1%Na2S2O5 aqueous solution by volume with the picral of mass fraction 4%) into
Row corrosion, can be using tissue white in dividing tissue as martensite through Lepera reagent caustic solution, and the tissue of gray is
Ferrite；Using Leica image analysis software measure and calculation Martensite Volume Fraction.
From cold rolled annealed finished steel coils sampling and tensile sample is made by 228 standard of GB/T, effective gauge length is 80 ×
20mm carries out Mechanics Performance Testing on SANA universal testing machine；And hole expansion test is carried out by the sampling of standard GB/T 15825.4
And calculate hole expansibility.
Specific embodiments of the present invention will be described in further detail below, but embodiments of the present invention are not limited to
This.
Embodiment 1
The tapping ladle chemistry of steel billet includes C:0.10%, Si:0.06% by weight percentage in the present embodiment,
Mn:1.20%, Alt:0.80%, Mo:0.25%, N:0.003%, P:0.008%, S:0.004%, surplus be Fe and other not
Evitable impurity, steel billet thickness 230mm.
In the present embodiment in hot-rolled process, as 2.00mm < hot rolling base-material thickness≤4.00mm, it is thick that roughing exports base
For 35mm；As 4.00mm < hot rolling base-material thickness≤6.00mm, it is 40mm that roughing, which exports base thickness,.
Using the component system of above-mentioned steel billet, the economical cold rolling DP590 of 280~330MPa yield strength rank is produced
Steel carries out the technological parameter of control each process section in accordance with the following methods:
(1) heating process: by heating steel billet, it is 1220~1240 DEG C that soaking section temperature, which is arranged, soaking time 40min；
(2) hot-rolled process: roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two setting model meter
It calculates；1060~1065 DEG C of roughing outlet temperature, 880~886 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling
Technique is cooled to 675~684 DEG C with the cooling rate of 20 DEG C/s, is batched；
(3) acid rolls process: then the above-mentioned coils of hot-rolled steel of pickling uses 56.4~60.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process: the steel band after acid is rolled carries out continuous annealing, and 820~830 DEG C of soaking temperature, slow cooling section terminates
660~670 DEG C of temperature, rapid cooling section terminates 280~290 DEG C of temperature, 270 DEG C of overaging section temperature.
Using the component system of above-mentioned steel billet, the economical cold rolling DP590 of 340~400MPa yield strength rank is produced
Steel carries out the technological parameter of control each process section in accordance with the following methods:
(1) heating process: by heating steel billet, it is 1220~1240 DEG C that soaking section temperature, which is arranged, soaking time 40min；
(2) hot-rolled process: roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two setting model meter
It calculates；1024~1037 DEG C of roughing outlet temperature, 860~882 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling
Technique is cooled to 632~660 DEG C with the cooling rate of 20 DEG C/s, is batched；
(3) acid rolls process: then the above-mentioned coils of hot-rolled steel of pickling uses 63.6~64.4% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process: the steel band after acid is rolled carries out continuous annealing, and 800~810 DEG C of soaking temperature, slow cooling section terminates
670~675 DEG C of temperature, rapid cooling section terminates 270~280 DEG C of temperature, 250~260 DEG C of overaging section temperature.
Using the component system of above-mentioned steel billet, the economical cold rolling DP590 of 420~490MPa yield strength rank is produced
Steel carries out the technological parameter of control each process section in accordance with the following methods:
(1) heating process: by heating steel billet, it is 1200~1220 DEG C that soaking section temperature, which is arranged, soaking time~30min；
(2) hot-rolled process: roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two setting model meter
It calculates；1036~1050 DEG C of roughing outlet temperature, 814~840 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling
Technique is cooled to 550~574 DEG C with the cooling rate of~20 DEG C/s, is batched；
(3) acid rolls process: then the above-mentioned coils of hot-rolled steel of pickling uses 68.0~70.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process: the steel band after acid is rolled carries out continuous annealing, and 780~790 DEG C of soaking temperature, slow cooling section terminates
670~685 DEG C of temperature, rapid cooling section terminates 270~280 DEG C of temperature, 250~260 DEG C of overaging section temperature.
With the economical cold rolling DP590 steel of different yield strength ranks in the present embodiment, smooth elongation control is 0.5
± 0.1%.
Main technique control parameter is as shown in table 1 in the present embodiment.
Main technique control parameter in 1 embodiment 1 of table
Microscopic examination and Mechanics Performance Testing are carried out to the cold rolling DP590 sampling being prepared, test is tied with analysis
Fruit is specifically shown in Table 2, and attached drawing 1 is 280~330MPa yield strength rank DP590 steel of technique 1-I preparation in the embodiment of the present invention 1
Micro-organization chart, attached drawing 2 be the embodiment of the present invention 1 in technique 1-III preparation 340~400MPa yield strength rank
The micro-organization chart of DP590 steel, attached drawing 3 are 420~490MPa yield strength grade that in the embodiment of the present invention 1 prepared by technique 1- VI
The micro-organization chart of other DP590 steel.By the test analysis calculated result of Analysis on Microstructure and each phase volume fraction it is found that this hair
The economical cold rolling DP590 steel for the different yield strength ranks being prepared in bright embodiment is made of ferrite and martensite.
Martensite Volume Fraction in the mechanical property and microscopic structure of 2 embodiment 1 of table
Embodiment 2
The tapping ladle chemistry of steel billet includes C:0.08%, Si:0.40% by weight percentage in the present embodiment,
Mn:1.40%, Alt:0.60%, Mo:0.20%, N:0.005%, P:0.006%, S:0.005%, surplus be Fe and other not
Evitable impurity, steel billet thickness 230mm.
Using the component system of above-mentioned steel billet, 280~330MPa, 340~400,420~490 3 kinds of yield strengths are produced
The economical cold rolling DP590 steel of rank carries out the technological parameter of control each process section, specific work according to the method in embodiment 1
Skill control parameter is as shown in table 3, carries out microscopic structure point to the cold rolling DP590 sampling for the different yield strength ranks being prepared
Analysis and Mechanics Performance Testing, test are specifically shown in Table 4 with analysis result.
Main technique control parameter in 3 embodiment 2 of table
Martensite Volume Fraction in the mechanical property and microscopic structure of 4 embodiment 2 of table
Embodiment 3
The tapping ladle chemistry of steel billet includes C:0.08%, Si:0.08% by weight percentage in the present embodiment,
Mn:1.35%, Alt:0.78%, Mo:0.30%, N:0.005%, P:0.008%, S:0.005%, surplus be Fe and other not
Evitable impurity, steel billet thickness 230mm.
Using the component system of above-mentioned steel billet, 280~330MPa, 340~400,420~490 3 kinds of yield strengths are produced
The economical cold rolling DP590 steel of rank carries out the technological parameter of control each process section, specific work according to the method in embodiment 1
Skill control parameter is as shown in table 5, carries out microscopic structure point to the cold rolling DP590 sampling for the different yield strength ranks being prepared
Analysis and Mechanics Performance Testing, test are specifically shown in Table 6 with analysis result.
Main technique control parameter in 5 embodiment 3 of table
Martensite Volume Fraction in the mechanical property and microscopic structure of 6 embodiment 3 of table
The present invention is not limited to the embodiment, anyone should learn that the structure made under the inspiration of the present invention becomes
Change, the technical schemes that are same or similar to the present invention are fallen within the scope of protection of the present invention.
Technology not described in detail in the present invention, shape, construction portion are well-known technique.
Claims (9)
1. a kind of method for the economical cold rolling DP590 steel for producing different yield strength ranks, it is characterised in that: including following step
It is rapid: by with a thickness of the steel billet of 230mm, to roll process, continuous annealing process and smooth process by heating process, hot-rolled process, acid, prepare
Cover 280~330Mpa, 340~400MPa, 420~490 3 kinds of yield strength ranks DP590 steel；
Wherein the chemical component of the steel billet includes following components: C:0.08~0.10% by weight percentage, Si≤0.4%,
Mn:1.20~1.40%, Alt:0.60~0.80%, Mo:0.20~0.30%, and N≤0.005% is limited, P≤0.008%,
S≤0.005%, surplus are Fe and other inevitable impurity.
2. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: the thickness specification of the DP590 steel product is 0.8~2.0mm.
3. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: the steel billet with a thickness of 230mm.
4. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: in the hot-rolled process, as 2.00mm < hot rolling base-material thickness≤4.00mm, roughing outlet base thickness is
35mm, as 4.00mm < hot rolling base-material thickness≤6.00mm, it is 40mm that roughing, which exports base thickness,.
5. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: the heating process, by heating steel billet, it is 1220~1250 DEG C that bringing-up section temperature, which is arranged, and soaking time is
40min。
6. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two setting model in the hot-rolled process
It calculates, specific process parameter is seen below:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, roughing outlet temperature 1060~1090
DEG C, 880~910 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, it is cooling with the cooling rate of about 20 DEG C/s
To 670~700 DEG C, batched；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, roughing outlet temperature 1020~1050
DEG C, 860~890 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, it is cooling with the cooling rate of about 20 DEG C/s
To 630~660 DEG C, batched；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, roughing outlet temperature 1020~1050
DEG C, 810~840 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling technique, it is cooling with the cooling rate of~20 DEG C/s
To 550~580 DEG C, batched.
7. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: the acid rolls in process, and pickling will remove oxide by the coil of strip of hot-rolled process, and technological parameter is seen below:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, using 55.0~60.0% pressure
Amount carries out cold rolling；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, using 63.0~68.0% pressure
Amount carries out cold rolling；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, using 65.0~70.0% pressure
Amount carries out cold rolling.
8. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: in the continuous annealing process, the steel band after acid to be rolled to process carries out continuous annealing, and technological parameter is seen below:
When producing the economical cold rolling DP590 steel of 280~330MPa yield strength rank, soaking temperature is 810~830 DEG C,
Slow cooling section terminates 650~670 DEG C of temperature, and rapid cooling section terminates 280~300 DEG C of temperature, 270~290 DEG C of overaging section temperature；
When producing the economical cold rolling DP590 steel of 340~400MPa yield strength rank, 800~820 DEG C of soaking temperature, delay
Cold section 670~690 DEG C of temperature of end, rapid cooling section terminates 260~280 DEG C of temperature, 250~270 DEG C of overaging section temperature；
When producing the economical cold rolling DP590 steel of 420~490MPa yield strength rank, 780~800 DEG C of soaking temperature, delay
Cold section 670~690 DEG C of temperature of end, rapid cooling section terminates 260~280 DEG C of temperature, 250~270 DEG C of overaging section temperature.
9. a kind of method of economical cold rolling DP590 steel for producing different yield strength ranks according to claim 1,
Be characterized in that: the smooth elongation control of the DP590 steel is 0.5 ± 0.1%.
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