CN108570627A - A method of producing the cold rolling DP980 steel of different yield strength ranks - Google Patents
A method of producing the cold rolling DP980 steel of different yield strength ranks Download PDFInfo
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- CN108570627A CN108570627A CN201810507356.2A CN201810507356A CN108570627A CN 108570627 A CN108570627 A CN 108570627A CN 201810507356 A CN201810507356 A CN 201810507356A CN 108570627 A CN108570627 A CN 108570627A
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/06—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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 for the cold rolling DP980 steel producing different yield strength ranks, use heating steel billet process, hot-rolled process, acid to roll process, continuous annealing process, smooth process successively, prepare 470~520MPa, tri- kinds of yield strength ranks of 550~680MPa and 700~800MPa cold rolling DP980 steel.The present invention fully considers that iron and steel enterprise is directed to the organization of production feature of small lot cold rolling DP980 steel, by rational composition design and efficiently control the key process parameter of each process section, good 470~the 520MPa of surface quality, 550~680MPa and the cold rolling DP980 steel product of the different yield strength ranks of tri- kinds of 700~800MPa can be produced using a kind of component system by realizing, not only it is conducive to iron and steel enterprise rapid digestion steel billet inventory, but also disclosure satisfy that the specific demand of automobile industry more parts, more performances.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, and in particular to a kind of cold rolling producing different yield strength ranks
The method of DP980 steel.
Background technology
In recent years, the environmental requirement that automobile industry faces is increasingly harsh, and orthodox car is regarded as the main dirt of urban atmosphere
One of dye source, improvement vehicle exhaust is very urgent, and future automobile technology will be with safety, energy-saving and environmental protection, intelligence for developing direction.
Dual phase steel in advanced high-strength steel is due to having the characteristics that low yield strength, high-tensile and good plasticity, dosage are pre-
Meter will be more than 70% in the advanced high-strength steel of automobile.Manufacture the economical dual phase steel of low cost that performance is stablized, at
The target for looking forward to pursuing by each steel, is persistently greatly paid close attention to.
In addition, each automobile main frame maker is less to the size of order of same levels cold-rolled biphase steel, about 20~60 tons every time, and
Domestic and international many iron and steel enterprises, tissue 1 stove high-strength steel of production is 210 tons, goes out strand about 8~10, can go out product volume 8~10
Volume is often rolled up and weighs about 20~25 tons.As it can be seen that fully consider that iron and steel enterprise is directed to the organization of production feature of small lot cold rolling DP980 steel,
By rational composition design and the key process parameter of each process section is efficiently controlled, realizing can give birth to using a kind of component system
The good cold rolling DP980 steel product with different yield strength ranks of surface quality is produced, is not only disappeared rapidly conducive to iron and steel enterprise
Change steel billet inventory, and disclosure satisfy that the specific demand of automobile industry more parts, more performances, is that those skilled in the art urgently solve
Certainly the technical issues of.
And existing disclosed technology, just for a kind of cold rolling DP980 steel of particular intensity level, carry out production method,
Processing method or manufacturing method illustrate, such as publication number CN 105803321A, CN 107043888A, CN 107058869A
Deng.
Invention content
To overcome the deficiency, the purpose of the present invention is to provide a kind of cold rollings producing different yield strength ranks
The method of DP980 steel by rational composition design and efficiently controls the key process parameter of each process section, realizes and use one
Kind component system can produce the good 470~520MPa of surface quality, 550~680MPa and 700~800MPa, tri- kinds of differences are bent
The cold rolling DP980 steel product of intensity rank is taken, is not only conducive to iron and steel enterprise rapid digestion steel billet inventory, but also disclosure satisfy that automobile
The specific demand of industry more parts, more performances.
The technical solution adopted by the present invention to solve the technical problems is：A kind of cold rolling producing different yield strength ranks
The method of DP980 steel uses heating steel billet process, hot-rolled process, acid to roll process, continuous annealing process, smooth process successively, prepares
The cold rolling DP980 steel of 470~520MPa, 550~680MPa and 700~800MPa, tri- kinds of yield strength ranks.
Specifically, the chemical composition of the steel billet includes C by weight percentage：0.080~0.130%, Si：0.28~
0.50%, Mn：2.00~2.50%, Alt：0.040~0.070%, Cr：0.40~0.70%, Mo：0.20~0.30%, Nb：
0.020~0.050%, and N≤0.005% is limited, P≤0.008%, S≤0.005%, surplus is Fe and other are inevitable
Impurity.
Specifically, it is 1.0~1.8mm that the thickness of the cold rolling DP780 steel product obtained, which is thickness specification,.
Specifically, the steel billet thickness that the heating steel billet process uses is 230mm.
Specifically, in the hot mutual aid system devised for poor peasants sequence, as 2.00mm ＜ hot rollings base-materials thickness≤4.00mm, it is thick that roughing exports base
For 40mm, as 4.00mm ＜ hot rollings base-materials thickness≤6.00mm, it is 50mm that roughing, which exports base thickness,.
Specifically, when preparing the cold rolling DP980 steel of 470~520MPa yield strength ranks, the ginseng of production process
Number is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1250~1280 DEG C, 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 roughing setting up mould
Type calculates；1070~1100 DEG C of roughing outlet temperature, 900~930 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion
Cooling technique is cooled to 680~710 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 48.0~52.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 800~820 DEG C of soaking temperature, slow cooling section is terminated
640~660 DEG C of temperature, 300~320 DEG C of rapid cooling section end temp, 290~310 DEG C of overaging section temperature.
Specifically, when preparing the cold rolling DP980 steel of 550~680MPa yield strength ranks, process parameter is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1220~1250 DEG C, 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 roughing setting up mould
Type calculates；1040~1070 DEG C of roughing outlet temperature, 870~900 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion
Cooling technique is cooled to 640~670 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 60.0~66.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid rolls carries out continuous annealing, and 780~800 DEG C of soaking temperature, temperature is terminated in slow cooling section
670~690 DEG C of degree, 280~300 DEG C of rapid cooling section end temp, 270~290 DEG C of overaging section temperature.
Specifically, when preparing the cold rolling DP980 steel of 700~800MPa yield strength ranks, process parameter is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1180~1220 DEG C, 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 roughing setting up mould
Type calculates；Roughing outlet temperature is 1020~1050 DEG C；860~890 DEG C of finish rolling finishing temperature, and ensure finishing stand last two
Percentage pass reduction >=10%；It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, be quickly cooled down with the cooling rate of >=40 DEG C/s
To 550~580 DEG C, batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 65.0~70.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 770~790 DEG C of soaking temperature, slow cooling section is terminated
680~700 DEG C of temperature, 250~270 DEG C of rapid cooling section end temp, 240~260 DEG C of overaging section temperature.
The invention has the advantages that：The present invention fully considers iron and steel enterprise for small lot cold rolling DP980 steel
Organization of production feature by rational composition design and efficiently controls the key process parameter of each process section, realizes and use one
Kind component system can produce the good 470~520MPa of surface quality, 550~680MPa and 700~800MPa, tri- kinds of differences are bent
The cold rolling DP980 steel product of intensity rank is taken, is not only conducive to iron and steel enterprise rapid digestion steel billet inventory, but also disclosure satisfy that automobile
The specific demand of industry more parts, more performances.Wherein 470~520MPa yield strengths rank DP980 steel adds especially suitable for deep
Work shapes and geometric accuracy requires high automobile structure；550~680MPa yield strength rank DP980 steel is especially suitable for cold
It shapes and requires high automobile structure and reinforcer；700~800MPa yield strength rank DP980 steel is especially suitable for having
The automobile structure and reinforcer that reaming or flange require.
Description of the drawings
Fig. 1 is the cold rolling DP980 for 470~520MPa yield strength ranks that in the embodiment of the present invention 1 prepared by technique 1-II
The micro-organization chart of steel；
Fig. 2 is the cold rolling DP980 for 550~680MPa yield strength ranks that in the embodiment of the present invention 1 prepared by technique 1-III
The micro-organization chart of steel；
Fig. 3 is the cold rolling DP980 for 700~800MPa yield strength ranks that in the embodiment of the present invention 1 prepared by technique 1- V
The micro-organization chart of steel.
Specific implementation mode
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 ﹑ polishings
With Lepera reagents (1%Na2S2O5The picral of aqueous solution and mass fraction 4% by volume 1：1 mixing) it carries out
Corrosion can be organized as martensite through Lepera reagents caustic solution with white in dividing tissue, and gray is organized as iron
Ferritic；Using Leica image analysis software measure and calculation Martensite Volume Fractions.
Sampling and it being made tensile sample by 228 standards of GB/T from cold rolled annealed finished steel coils, effective gauge length is 80 ×
20mm carries out Mechanics Performance Testing on SANA universal testing machines.
It is sampled from cold rolled annealed finished steel coils, is sampled by standard GB/T 15825.4 and carry out hole expansion test and calculate reaming
Rate.
In conjunction with the accompanying drawings, the present invention is further explained in detail.
Embodiment 1
The tapping ladle chemistry of steel billet includes C by weight percentage in the present embodiment：0.080%, Si：0.50%,
Mn：2.00%, Alt：0.040%, Cr：0.40%, Mo：0.30%, Nb：0.020%, N：0.004%, P：0.006%, S：
0.005%, surplus is Fe and other inevitable impurity, steel billet thickness 230mm.
The roughing outlet base thickness of hot rolling base-material thickness 2.00mm ＜ hot rollings base-materials thickness≤4.00mm is in the present embodiment
40mm；The roughing outlet base thickness of 4.00mm ＜ hot rollings base-materials thickness≤4.50mm is 50mm.
The production method of 470~520MPa yield strengths rank DP980 steel, is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1250~1280 DEG C, 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 roughing setting up mould
Type calculates；1076~1100 DEG C of roughing outlet temperature, 900~928 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion
Cooling technique is cooled to 692~710 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 51.5~52.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 810~820 DEG C of soaking temperature, slow cooling section is terminated
640~655 DEG C of temperature, 310~320 DEG C of rapid cooling section end temp, 290~300 DEG C of overaging section temperature.
The production method of 550~680MPa yield strengths rank DP980 steel is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1220~1250 DEG C, 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 roughing setting up mould
Type calculates；1040~1054 DEG C of roughing outlet temperature, 870~881 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion
Cooling technique is cooled to 640~653 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 60.0~65.1% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 790~800 DEG C of soaking temperature, slow cooling section is terminated
675~690 DEG C of temperature, 280~300 DEG C of rapid cooling section end temp, 270~290 DEG C of overaging section temperature.
The production method of 700~800MPa yield strengths rank DP980 steel is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1180~1220 DEG C, 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 roughing setting up mould
Type calculates；Roughing outlet temperature is 1043~1050 DEG C；884~890 DEG C of finish rolling finishing temperature, and ensure finishing stand last two
Percentage pass reduction >=10%；It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, be quickly cooled down with the cooling rate of >=40 DEG C/s
To 574~580 DEG C, batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 65.0~68.9% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 780~790 DEG C of soaking temperature, slow cooling section is terminated
680~700 DEG C of temperature, 260~270 DEG C of rapid cooling section end temp, 240~250 DEG C of overaging section temperature.
Cold rolling DP980 steel with different yield strength ranks in the present embodiment, smooth elongation control 0.5 ±
0.1%.
Main technique control parameter is as shown in table 1 in the present embodiment.
Microscopic examination is carried out to the different yield strength rank cold rolling DP980 samplings being prepared and mechanical property is surveyed
Examination, test are specifically shown in Table 2 with analysis result.Attached drawing 1 is that 470~520MPa that in the embodiment of the present invention 1 prepared by technique 1-II is bent
Take the micro-organization chart of the cold rolling DP980 steel of intensity rank；Attached drawing 2 is 550 that in the embodiment of the present invention 1 prepared by technique 1-III
The micro-organization chart of the cold rolling DP980 steel of~680MPa yield strength ranks；Attached drawing 3 is technique 1- V in the embodiment of the present invention 1
The micro-organization chart of the cold rolling DP980 steel of the 700~800MPa yield strength ranks prepared.By Analysis on Microstructure and each phase body
The test analysis result of calculation of fraction is it is found that the different yield strength rank cold rollings being prepared in the embodiment of the present invention
DP980 steel is made of ferrite and martensite.
Main technique control parameter in 1 embodiment 1 of table
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 by weight percentage in the present embodiment：0.130%, Si：0.28%,
Mn：2.50%, Alt：0.070%, Cr：0.45%, Mo：0.20%, Nb：0.050%, N：0.005%, P：0.004%, S：
0.003%, surplus is Fe and other inevitable impurity, steel billet thickness 230mm.
The roughing outlet base thickness of hot rolling base-material thickness 2.00mm ＜ hot rollings base-materials thickness≤4.00mm is in the present embodiment
40mm；The roughing outlet base thickness of 4.00mm ＜ hot rollings base-materials thickness≤5.50mm is 50mm.
Cold rolling DP980 steel with different yield strength ranks in the present embodiment, according to the step of described in embodiment 1
The technological parameter of control each process section is carried out, concrete technology control parameter is as shown in table 3.
Main technique control parameter in 3 embodiment 2 of table
Microscopic examination is carried out to the different yield strength rank cold rolling DP980 samplings being prepared and mechanical property is surveyed
Examination, test are specifically shown in Table 4 with analysis result.
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 by weight percentage in the present embodiment：0.010%, Si：0.30%,
Mn：2.40%, Alt：0.045%, Cr：0.70%, Mo：0.26%, Nb：0.045%, N：0.005%, P：0.008%, S：
0.003%, surplus is Fe and other inevitable impurity, steel billet thickness 230mm.
The roughing outlet base thickness of hot rolling base-material thickness 3.00mm is 40mm in the present embodiment；4.00mm ＜ hot rolling base-material thickness
The roughing outlet base thickness of≤5.00mm is 50mm.
Cold rolling DP980 steel with different yield strength ranks in the present embodiment, according to the step of described in embodiment 1
The technological parameter of control each process section is carried out, concrete technology control parameter is as shown in table 5.
Main technique control parameter in 5 embodiment 3 of table
Microscopic examination is carried out to the different yield strength rank cold rolling DP980 samplings being prepared and mechanical property is surveyed
Examination, test are specifically shown in Table 6 with analysis result.
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 each fallen within protection scope of the present invention.
Technology that the present invention is not described in detail, shape, construction part are known technology.
Claims (8)
1. a kind of method for the cold rolling DP980 steel producing different yield strength ranks, it is characterised in that：Steel billet is used into steel successively
Base heating process, hot-rolled process, acid roll process, continuous annealing process, smooth process, prepare 470~520MPa, 550~680MPa and
The cold rolling DP980 steel of 700~800MPa, tri- kinds of yield strength ranks.
2. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：The chemical composition of the steel billet includes C by weight percentage：0.080~0.130%, Si：0.28~0.50%, Mn：2.00
~2.50%, Alt：0.040~0.070%, Cr：0.40~0.70%, Mo：0.20~0.30%, Nb：0.020~
0.050%, and N≤0.005% is limited, P≤0.008%, S≤0.005%, surplus is Fe and other inevitable impurity.
3. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：It is 1.0~1.8mm that the thickness of the cold rolling DP780 steel product obtained, which is thickness specification,.
4. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：The steel billet thickness that the heating steel billet process uses is 230mm.
5. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：In the hot mutual aid system devised for poor peasants sequence, as 2.00mm ＜ hot rollings base-materials thickness≤4.00mm, it is 40mm that roughing, which exports base thickness, when
When 4.00mm ＜ hot rollings base-materials thickness≤6.00mm, it is 50mm that roughing, which exports base thickness,.
6. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：When preparing the cold rolling DP980 steel of 470~520MPa yield strength ranks, the parameter of production process is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1250~1280 DEG C, 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 roughing setting up model meter
It calculates；1070~1100 DEG C of roughing outlet temperature, 900~930 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling
Technique is cooled to 680~710 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 48.0~52.0% drafts to carry out to remove oxide
Cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, 800~820 DEG C of soaking temperature, slow cooling section end temp
640~660 DEG C, 300~320 DEG C of rapid cooling section end temp, 290~310 DEG C of overaging section temperature.
7. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：When preparing the cold rolling DP980 steel of 550~680MPa yield strength ranks, process parameter is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1220~1250 DEG C, 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 roughing setting up model meter
It calculates；1040~1070 DEG C of roughing outlet temperature, 870~900 DEG C of finish rolling finishing temperature；It is taken after finish rolling and rolls rear leading portion cooling
Technique is cooled to 640~670 DEG C with the cooling rate of about 20 DEG C/s, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 60.0~66.0% drafts to carry out to remove oxide
Cold rolling；
(4) continuous annealing process：Steel band after acid rolls carries out continuous annealing, 780~800 DEG C of soaking temperature, slow cooling section end temp 670
~690 DEG C, 280~300 DEG C of rapid cooling section end temp, 270~290 DEG C of overaging section temperature.
8. a kind of method of cold rolling DP980 steel producing different yield strength ranks according to claim 1, feature exist
In：When preparing the cold rolling DP980 steel of 700~800MPa yield strength ranks, process parameter is seen below：
(1) heating steel billet process：By heating steel billet, setting soaking zone temperature is 1180~1220 DEG C, 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 roughing setting up model meter
It calculates；Roughing outlet temperature is 1020~1050 DEG C；860~890 DEG C of finish rolling finishing temperature, and ensure last two passage of finishing stand
Reduction ratio >=10%；It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, 550 are quickly cooled to the cooling rate of >=40 DEG C/s
It~580 DEG C, is batched；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 65.0~70.0% drafts to carry out to remove oxide
Cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, 770~790 DEG C of soaking temperature, slow cooling section end temp
680~700 DEG C, 250~270 DEG C of rapid cooling section end temp, 240~260 DEG C of overaging section temperature.
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| CN109182672A (en) * | 2018-10-26 | 2019-01-11 | 山东钢铁集团日照有限公司 | A method of producing the economical cold rolling DP590 steel of different yield strength ranks |
| CN109881106A (en) * | 2019-04-01 | 2019-06-14 | 山东钢铁集团日照有限公司 | A kind of 780MPa grade hot dip galvanized dual phase steel producing different yield strength ranks and its production method |
| CN110004361A (en) * | 2019-04-01 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of production method improving cold rolling DP980 steel yield tensile ratio and reaming performance |
| CN110564928A (en) * | 2019-10-18 | 2019-12-13 | 山东钢铁集团日照有限公司 | method for producing hot-galvanized DP980 steel with different yield strength levels |
| CN112553531A (en) * | 2020-12-04 | 2021-03-26 | 山东钢铁集团日照有限公司 | Low-cost hot forming steel for pipe making and production and preparation method thereof |
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| CN112553531A (en) * | 2020-12-04 | 2021-03-26 | 山东钢铁集团日照有限公司 | Low-cost hot forming steel for pipe making and production and preparation method thereof |
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