CN107695099B - Method based on CSP process production thin gauge hot rolling DP600 steel - Google Patents
Method based on CSP process production thin gauge hot rolling DP600 steel Download PDFInfo
- Publication number
- CN107695099B CN107695099B CN201710854492.4A CN201710854492A CN107695099B CN 107695099 B CN107695099 B CN 107695099B CN 201710854492 A CN201710854492 A CN 201710854492A CN 107695099 B CN107695099 B CN 107695099B
- Authority
- CN
- China
- Prior art keywords
- steel
- hot rolling
- cooling
- rolling
- thin gauge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- B21B2001/228—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 skin pass rolling or temper rolling
Abstract
The invention discloses a kind of methods based on CSP process production thin gauge hot rolling DP600 steel, include the following steps: 1) to adjust molten iron component；2) sheet blank continuous casting, control slab thickness are 52~55mm, and drawing speed is 3.8~4.2m/min；3) conventional soaking, control tapping temperature are 1190~1210 DEG C, and soaking time is 25~35min；4) high-pressure water descaling is carried out；5) seven passage finish rolling are carried out, finishing temperature is 790~820 DEG C, and Final Stand Rolling speed is 6.6~10.2m/s；6) it two-stage cooling and batches, first segment water cooling is to 670~690 DEG C, then air-cooled 4.0~6.6s, and second segment water cooling is to 100~150 DEG C；7) it carries out smooth.Product of the present invention performance is stablized, and has the characteristics that low cost, high-intensitive, thin gauge and low yield strength ratio, can reach the quality requirement of cold-rolled products, is of great significance to " with the hot Dai Leng " process for pushing auto industry.
Description
Technical field
The present invention relates to a kind of hot rolling DP600 steel, particularly relate to a kind of based on CSP process production thin gauge hot rolling DP600
The method of steel.
Background technique
With increasingly depleted and ecological environment the deterioration of the energy, the lightweight of automobile more and more attention has been paid to.Use height
Performance automobiles are the effective means realized the energy conservation of automobile loss of weight, improve safety with steel.Dual phase steel abbreviation DP steel, is by ferrite
The advanced high-strength steel constituted with martensite two-phase structure, because of its low yield strength ratio, high initial work hardening rate, good strong plasticity
Match and baking and hardening performance etc., the application demand of automobile various structures part, reinforcer and anti-striker can be met, become current application
The vehicle structure steel of amount maximum, most species.
DP steel is broadly divided into two class of hot rolling DP steel and cold rolling DP steel, compared with cold rolling DP steel, hot rolling DP steel by production method
Have many advantages, such as that at low cost, production procedure is easy and comprehensive performance is good.Currently, automobile market is in great demand to DP steel, " with
The thin gauge hot rolling DP steel of hot Dai Leng " has more the market competitiveness, has a extensive future, and will be that inexpensive automobile high-strength steel will be sent out from now on
The important directions of exhibition.
Traditional hot continuous rolling process, because being limited by strip increasing speed rolling and technology controlling and process precision, cooling temperature and time
It is difficult to realize accurately control, so that the controllability of two-phase proportion is poor in duplex structure, be easy to cause performance unstable.For this purpose,
Traditional hot continuous rolling producing line need to usually use Coil Box or insulation cover to ensure the stability of technical process.Meanwhile part producing line is cold
But ability is lower, can only produce medium temperature and batch type hot rolling DP600 steel (alloying element that this steel need to usually add the valuableness such as Mo),
It is difficult to economically obtain the duplex structure of ferrite and martensite, and product thickness specification is in 2.0mm or more.
Bar strip continuous casting and rolling flow path organically combines the processes such as the continuous casting of traditional process, heating, rolling, process letter
About efficiently, energy conservation and environmental protection., cooling capacity stronger feature constant using its mill speed, low temperature that can be stable with production performance
Batch type hot rolling DP600 steel.
A kind of Chinese patent application " the manufacturer of the good economical hot-rolled dual-phase steel of surface quality based on CSP technique
Method " (publication No. CN101906571A) discloses a kind of use C-Mn-Cr component system, and the good low temperature of surface quality batches type
The manufacturing method of hot-rolled dual-phase steel, the hot-rolled dual-phase steel intensity rank in 590MPa or more, coiling temperature 210 DEG C with
Under, structure property control is stablized, and deviation is can be controlled within 5%, and thickness specification is 4.0~6.0mm.Chinese patent application " one
Think gauge hot-rolled dual-phase steel manufacturing method of the kind based on CSP technique " (publication No. CN104593665A) discloses a kind of using C-
Mn component system, the manufacturing method of 590MPa grades of dual phase steels of industrialized mass production, the hot-rolled dual-phase steel coiling temperature are
150~250 DEG C, it has excellent performance stabilization, thickness specification 11.0mm.Above-mentioned two document and existing CSP technique production be
The hot-rolled dual-phase steel of think gauge is not able to satisfy demand of the automobile industry to " with hot Dai Leng " thin gauge hot-rolled dual-phase steel.
In thin slab continuous casting and rolling production thin gauge especially mistake of the thickness specification in 1.5mm hot rolling DP600 steel below
Cheng Zhong, short by section cooling section length and Final Stand Rolling is fireballing influences, water cooling time and air cooling time is short so that iron is plain
Body transformation is insufficient, and martensite content is excessively high or even bainite and pearlite occurs, and product yield tensile ratio is higher.Simultaneously as adopting
Batched with low temperature, the plate shape of thin gauge hot rolling DP600 steel is poor, it is necessary to carry out it is smooth, and it is smooth after steel plate occur processing hardening,
Cause yield strength and yield tensile ratio further to increase, causes the forming property of hot rolling DP600 steel poor, increase part punching mistake
To the abrasion of mold and springback capacity in journey.Therefore, (thick for thin gauge under the conditions of existing bar strip continuous casting and rolling flow path
Degree≤2.0mm) hot rolling DP600 steel, it is difficult to realize chemical component, process window, structure property, strip shape quality stable matching,
Constrain the industrialized production of such fashioned iron and " with hot Dai Leng " process of auto industry.
Summary of the invention
The purpose of the present invention is to provide a kind of method based on CSP process production thin gauge hot rolling DP600 steel, Neng Gousheng
Produce high intensity, low yield strength ratio, the thin gauge hot rolling DP600 steel that can be used for substituting condition of equivalent thickness specification cold rolling DP600 steel.
To achieve the above object, the method provided by the present invention based on CSP process production thin gauge hot rolling DP600 steel,
Include the following steps:
1) molten iron component is adjusted by smelting the modes such as refining, is to guarantee that hot rolling DP600 steel finished product meets component requirements
It is quasi-；
2) sheet blank continuous casting is carried out, control slab thickness is 52~55mm, and drawing speed is 3.8~4.2m/min；
3) conventional soaking being carried out to slab, and controlling tapping temperature is 1190~1210 DEG C, soaking time is 25~
35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than
220bar, de-scaling water need to open in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
5) carry out seven passage finish rolling, control finishing temperature be 790~820 DEG C, control Final Stand Rolling speed be 6.6~
10.2m/s, and carry out constant speed rolling；Adjust F1~F4 rack roll gap cooling water timing, it is ensured that reach each rack in strip steel head
The gap cooling water of the rack is opened before；
6) it is cooled down and is batched, described cooling using two-stage cooling mode, belt steel temperature is down to by first segment water cooling
670~690 DEG C, then air-cooled 4.0~6.6s, makes the ferrite content in hot rolling DP600 steel reach required volume fraction；The
Belt steel temperature is down to 100~150 DEG C by two sections of water coolings, and the martensite content in hot rolling DP600 steel is made to reach required volume point
Number；It is batched after two-stage cooling；
7) it carries out smooth, is carried out after steel roll temperature is down to 50 DEG C or less smooth, work roll for temper mill is made using 20 μm of convex rollers
With positive roller control model, and skin pass rolling power is controlled within 160t, while guaranteeing finished strip strip shape quality, reduce material
The elevation amplitude of yield strength and yield tensile ratio is expected, to obtain the hot rolling DP600 steel of low yield strength ratio；
By hot rolling DP600 steel made from above-mentioned steps, the elemental constituent for being included and weight percent content (i.e. step
1) component requirements described in) as follows: C:0.040~0.065%, Si:0.20~0.40%, Mn:1.10~1.40%, Cr:
0.40~0.70%, Als:0.02~0.07%, P :≤0.020%, S :≤0.006%, remaining for Fe and inevitably it is miscellaneous
Matter.
Preferably, the component of the hot rolling DP600 steel and weight percent content are as follows: C:0.050~0.065%, Si:
0.25~0.35%, Mn:1.15~1.35%, Cr:0.40~0.60%, Als:0.02~0.06%, P :≤0.015%, S:
≤ 0.005%, remaining is Fe and inevitable impurity.
Preferably, in step 1), adjustment molten iron component include the following steps: 1.1) desulfurizing iron, and control S≤
0.001%, molten iron exposed surface >=96% after skimming；1.2) converter smelting is carried out, and carries out LF furnace refining.
Preferably, in step 5), F1~F4 rack roll gap cooling water timing settings are as follows: F1=12m, F2=17m, F3=
21.5m F4=26m.Rack roll gap cooling water opens timing on the basis of soaking outlet of still.For example, F1 rack roll gap cooling water
Timing settings are 12m, indicate to open F1 rack roll gap cooling water after slab head goes out 12 meters of soaking pit；F2 rack roll gap cooling water
Timing settings are 17m, indicate to open F2 rack roll gap cooling water after slab head goes out 17 meters of soaking pit.
Preferably, in step 5), F7 rack AGC (gauge automatic control) amplitude limit value is set as 0.6~1.0mm, F6 machine
Frame AGC amplitude limit value is set as 0.8~1.2mm, while ensuring thin material rolling stability, improves steel strip thickness precision.
Preferably, in step 6), adjusting ferritic volume fraction in hot rolling DP600 steel is 78~85%；Martensite
Volume fraction is 15~22%.
Preferably, in step 6), after the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of
Start side spray, and starting blower is purged, to remove belt steel surface residual water, realizes that temperature accurately controls, and mention
The accuracy of high detection device temperature measurement.
Preferably, hot rolling DP600 steel produced, thickness specification are 1.0~2.0mm, and the yield strength of material is 330
~420MPa, tensile strength >=600MPa, elongation percentage A50 >=23%, yield tensile ratio≤0.60 can be used for substituting condition of equivalent thickness specification
Cold rolling DP600 steel.
The selection of each step main technologic parameters of the present invention or preferred reason are as follows:
1) de-scaling water is opened in step 4) in advance, and completes to build pressure and reach de-scaling water pressure before strip steel head enters de-scaling
It opens F1~F4 rack roll gap cooling water in advance into target value and step 5), is for reducing strip steel head temperature, make
Strip overall length temperature is uniform, to guarantee operation of rolling constant airspeed, improves the controllability of two-phase proportion in duplex structure, reaches production
Moral character can be stable purpose.
2) in step 5), F7 rack AGC (gauge automatic control) amplitude limit value is preferably set as 0.6~1.0mm, F6 rack
AGC amplitude limit value is set as 0.8~1.2mm, while being to improve steel strip thickness precision, it is ensured that thin gauge hot rolling DP600 steel
The stability of rolling.AGC amplitude limit value sets the too small ability that will limit gauge automatic control, and the setting of AGC amplitude limit value is excessive, can lead
The Frequent Accidents such as the folding of the thin material operation of rolling, whipping are caused, or even steel scrap occurs, breaks and pours accident, influence stable and antegrade production.
3) control Final Stand Rolling speed is 6.6~10.2m/s in step 5), uses two stage type cooling in step 6)
Skill, first segment is cooling to be down to 670~690 DEG C for belt steel temperature, and then air-cooled 4.0~6.6s, is to make in hot rolling DP600 steel
Ferrite content reach required volume fraction；Second segment is cooling to be down to 100~150 DEG C for belt steel temperature, is to make heat
The volume fraction that the martensite content in DP600 steel reaches required is rolled, volume needed for ferrite point in the hot rolling DP600 steel
Number is 78~85%, and it is key technology of the invention that volume fraction needed for martensite, which is 15~22%,.
4) in step 6), after the completion of preferably cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of
Starting side spray (positioned at the sprinkler of working side) carries out water spray and blower (be located at side spray the same side) is purged, be in order to
It removes belt steel surface and remains water, realize that temperature accurately controls, and improve the accuracy of detection device temperature measurement.
5) in step 7), work roll for temper mill uses 20 μm of convex rollers, using positive roller control model, and controls smooth two side pressure
Power is within 160 tons, while being to guarantee that finished strip strip shape quality is good, reduces material yield strength and yield tensile ratio
Elevation amplitude improves the forming property of material to obtain the hot rolling DP600 steel of low yield strength ratio, and it is right during part punching to reduce
The abrasion of mold and springback capacity are key technologies of the invention.
Compared with prior art, the invention has the following advantages that
1) thin gauge hot rolling DP600 steel is produced using CSP technique, for substituting the cold rolling DP600 steel of condition of equivalent thickness specification,
Subsequent cold rolling and annealing are not needed, cost can be greatly reduced, shortens production procedure, and energy conservation and environmental protection；It simultaneously can also
Enough avoid the problem that existing thin plate blank continuously casting and continuously rolling technology production thin gauge hot rolling DP600 steel yield tensile ratio is higher, deformed steel strip.
2) thin gauge hot rolling DP600 steel produced can effectively obtain ferrite+martensite duplex structure, thickness specification
For 1.0~2.0mm, the yield strength of material is bent up to 330~420MPa, tensile strength >=600MPa, elongation percentage A50 >=23%
Strong ratio≤0.60 has the characteristics of low cost, high-intensitive, thin gauge and low yield strength ratio.
3) process of the present invention is short, and properties of product are stablized, and strip shape quality is good, and thickness and precision is high, can reach cold-rolled products
Quality requirement can be used for substituting the cold rolling DP600 steel of condition of equivalent thickness specification, can smoothly complete complex deformation, and rebounds upon deformation
It is small, it is of great significance to " with the hot Dai Leng " process for pushing auto industry.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of the thin gauge hot rolling DP600 steel produced of the embodiment of the present invention 3.
Specific embodiment
Method provided by the present invention based on CSP process production thin gauge hot rolling DP600 steel, its step are as follows:
1) desulfurizing iron, and S≤0.001% is controlled, molten iron exposed surface >=96% after skimming；
2) converter smelting is carried out, and carries out LF furnace refining；
3) sheet blank continuous casting, control slab thickness are 52~55mm, and drawing speed is 3.8~4.2m/min；
4) conventional soaking being carried out to slab, and controlling tapping temperature is 1190~1210 DEG C, soaking time is 25~
35min；
5) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than
220bar, and de-scaling water is opened in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
6) carry out seven passage finish rolling, control finishing temperature be 790~820 DEG C, control Final Stand Rolling speed be 6.6~
10.2m/s, and carry out constant speed rolling；
F1-F4 rack roll gap cooling water timing is adjusted, F1 setting value is 12m, and F2 setting value is 17m, and F3 setting value is
21.5m, F4 setting value are 26m, to ensure to open before strip steel head reaches the rack；
F7 rack AGC amplitude limit value is set as 0.6~1.0mm, F6 rack AGC amplitude limit value is set as 0.8~1.2mm,
While ensuring thin material rolling stability, steel strip thickness precision is improved；
7) it is cooled down and is batched, described cooling using two-stage cooling mode, first segment uses water cooling by belt steel temperature
670~690 DEG C are down to, then air-cooled 4.0~6.6s, the ferrite content in hot rolling DP600 steel is made to reach required volume point
Number；Belt steel temperature is down to 100~150 DEG C using water cooling by second segment, needed for reaching the martensite content in hot rolling DP600 steel
Volume fraction, batched later；Volume fraction needed for ferrite is 78~85% in the hot rolling DP600 steel, geneva
Volume fraction needed for body is 15~22%；
After the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of start side spray, and
Starting blower is purged, and to remove belt steel surface residual water, realizes that temperature accurately controls, and improve the survey of detection device temperature
The accuracy of amount.
8) progress is smooth, carries out after steel roll temperature is down to 50 DEG C or less smooth；
Work roll for temper mill uses 20 μm of convex rollers, using positive roller control model, and controls skin pass rolling power within 160t,
While guaranteeing finished strip strip shape quality, reduce the elevation amplitude of material yield strength and yield tensile ratio, to obtain low yield strength ratio
Hot rolling DP600 steel.
9) process after carrying out.
By hot rolling DP600 steel made from above-mentioned steps, the elemental constituent and weight percent content for being included are as follows: C:
0.040~0.065%, Si:0.20~0.40%, Mn:1.10~1.40%, Cr:0.40~0.70%, Als:0.02~
0.07%, P :≤0.020%, S :≤0.006%, remaining is Fe and inevitable impurity.
Below by specific embodiment, the present invention is further illustrated.
Examples 1 to 6
By above-mentioned steps, in Examples 1 to 6, the chemical component and its weight percent of thin gauge hot rolling DP600 steel are shown in Table
1。
By above-mentioned steps, in Examples 1 to 6, the main technologic parameters that thin gauge hot rolling DP600 steel production process is related to are taken
Value is shown in Table 2.
By above-mentioned steps, in Examples 1 to 6, the structure property detection of thin gauge hot rolling DP600 steel and quality condition are shown in Table
3。
1 Examples 1 to 6 chemical component comparative example (wt%) of table
| Embodiment | C | Si | Mn | P | S | Cr | Als |
| 1 | 0.059 | 0.20 | 1.20 | 0.012 | 0.005 | 0.52 | 0.036 |
| 2 | 0.040 | 0.35 | 1.27 | 0.011 | 0.004 | 0.70 | 0.070 |
| 3 | 0.052 | 0.40 | 1.40 | 0.013 | 0.003 | 0.55 | 0.045 |
| 4 | 0.058 | 0.28 | 1.25 | 0.012 | 0.004 | 0.52 | 0.020 |
| 5 | 0.065 | 0.29 | 1.10 | 0.014 | 0.005 | 0.40 | 0.039 |
| 6 | 0.055 | 0.26 | 1.26 | 0.020 | 0.006 | 0.56 | 0.041 |
2 Examples 1 to 6 main technologic parameters comparative example of table
The detection of 3 Examples 1 to 6 structure property of table and quality in kind situation list
From table 1~3 as can be seen that the present invention is based on the thin gauge hot rolling DP600 steel that CSP process produces, thickness specification is
1.0~2.0mm, the yield strength of material is up to 330~420MPa, tensile strength >=600MPa, elongation percentage A50 >=23%, Qu Qiang
Than≤0.60, has the characteristics of low cost, high-intensitive, thin gauge and low yield strength ratio.It can be used for automobile A, B in automobile steel
Column inner panel etc..
Fig. 1 gives the metallographic structure figure of the thin gauge hot rolling DP600 steel produced of embodiment 3, as can be seen from the figure
DP600 finished product tissue is ferrite+Dispersed precipitate island-like martensite of polygon, and grain size number is 12.5~13.0 grades.
Claims (8)
1. a kind of method based on CSP process production thin gauge hot rolling DP600 steel, characterized by the following steps:
1) molten iron component is adjusted, is subject to and guarantees that hot rolling DP600 steel finished product meets component requirements；
2) sheet blank continuous casting is carried out, control slab thickness is 52~55mm, and drawing speed is 3.8~4.2m/min；
3) conventional soaking is carried out to slab, and controlling tapping temperature is 1190~1210 DEG C, soaking time is 25~35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than 220bar, removes
Squama water needs to open in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
5) seven passage finish rolling are carried out, control finishing temperature is 790~820 DEG C, and control Final Stand Rolling speed is 6.6~10.2m/
S, and carry out constant speed rolling；Adjust F1~F4 rack roll gap cooling water timing, it is ensured that open before strip steel head reaches each rack
Open the gap cooling water of the rack；
6) cooled down and batched, it is described it is cooling use two-stage cooling mode, belt steel temperature is down to 670 by first segment water cooling~
690 DEG C, then air-cooled 4.0~6.6s, makes the ferrite content in hot rolling DP600 steel reach required volume fraction；Second segment
Belt steel temperature is down to 100~150 DEG C by water cooling, and the martensite content in hot rolling DP600 steel is made to reach required volume fraction；Two
It is batched after segmentation is cooling；
7) carried out after steel roll temperature is down to 50 DEG C or less it is smooth, work roll for temper mill use 20 μm of convex rollers, controlled using positive roller
Mode, and skin pass rolling power is controlled within 160t；
By hot rolling DP600 steel made from above-mentioned steps, the elemental constituent and weight percent content for being included are as follows: C:
0.040~0.065%, Si:0.20~0.40%, Mn:1.10~1.40%, Cr:0.40~0.70%, Als:0.02~
0.07%, P :≤0.020%, S :≤0.006%, remaining is Fe and inevitable impurity.
2. the method according to claim 1 based on CSP process production thin gauge hot rolling DP600 steel, it is characterised in that: institute
Component and the weight percent content for stating hot rolling DP600 steel are as follows: C:0.050~0.065%, Si:0.25~0.35%, Mn:
1.15~1.35%, Cr:0.40~0.60%, Als:0.02~0.06%, P :≤0.015%, S :≤0.005%, remaining is
Fe and inevitable impurity.
3. the method according to claim 1 based on CSP process production thin gauge hot rolling DP600 steel, it is characterised in that: step
It is rapid 1) in, adjustment molten iron component includes the following steps: 1.1) desulfurizing iron, and controls S≤0.001%, molten iron is exposed after skimming
Face >=96%；1.2) converter smelting is carried out, and carries out LF furnace refining.
4. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP600 steel,
It is characterized in that: in step 5), F1~F4 rack roll gap cooling water timing settings are as follows: F1=12m, F2=17m, F3=21.5m, F4
=26m.
5. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP600 steel,
It is characterized in that: in step 5), F7 rack AGC amplitude limit value being set as 0.6~1.0mm, F6 rack AGC amplitude limit value is set as 0.8
~1.2mm.
6. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP600 steel,
Be characterized in that: in step 6), adjusting ferritic volume fraction in hot rolling DP600 steel is 78~85%, the volume point of martensite
Number is 15~22%.
7. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP600 steel,
Be characterized in that: in step 6), after the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of start
Side spray is sprayed water, and starting blower is purged, to remove belt steel surface residual water.
8. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP600 steel,
Be characterized in that: hot rolling DP600 steel produced, thickness specification are 1.0~2.0mm, the yield strength of material is 330~
420MPa, tensile strength >=600MPa, elongation percentage A50 >=23%, yield tensile ratio≤0.60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710854492.4A CN107695099B (en) | 2017-09-20 | 2017-09-20 | Method based on CSP process production thin gauge hot rolling DP600 steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710854492.4A CN107695099B (en) | 2017-09-20 | 2017-09-20 | Method based on CSP process production thin gauge hot rolling DP600 steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107695099A CN107695099A (en) | 2018-02-16 |
| CN107695099B true CN107695099B (en) | 2019-07-09 |
Family
ID=61171687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710854492.4A Active CN107695099B (en) | 2017-09-20 | 2017-09-20 | Method based on CSP process production thin gauge hot rolling DP600 steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107695099B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108546872B (en) * | 2018-04-13 | 2020-08-04 | 武汉钢铁有限公司 | Hot-rolled dual-phase thin steel plate with tensile strength not lower than 600MPa produced by CSP production line and method |
| CN109266960B (en) * | 2018-09-26 | 2019-11-26 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN108971224B (en) * | 2018-09-27 | 2020-11-06 | 武汉钢铁有限公司 | Production method of patterned steel plate |
| CN108971225B (en) * | 2018-09-27 | 2020-10-30 | 武汉钢铁有限公司 | Production method of weather-resistant patterned steel plate |
| CN112430772A (en) * | 2020-09-28 | 2021-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | CSP flow-based medium-temperature coiling type hot rolling DP600 production method |
| CN112453070A (en) * | 2020-10-27 | 2021-03-09 | 邯郸钢铁集团有限责任公司 | Shape control method for thin hot-rolled structural steel plate |
| CN114231837A (en) * | 2021-11-17 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | 600 MPa-grade dual-phase steel for wheel spoke and production method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330785C (en) * | 2005-12-27 | 2007-08-08 | 东北大学 | Strength of extension 1000 MPa grade complex phase steel plate and mfg. method thereof |
| JP4980163B2 (en) * | 2007-07-20 | 2012-07-18 | 新日本製鐵株式会社 | Composite steel sheet having excellent formability and method for producing the same |
| KR20140066594A (en) * | 2012-11-23 | 2014-06-02 | 현대제철 주식회사 | Dual phase steel sheet with excellent galvanizing property and method of manufacturing the steel sheet |
| US20140261914A1 (en) * | 2013-03-15 | 2014-09-18 | Thyssenkrupp Steel Usa, Llc | Method of producing hot rolled high strength dual phase steels using room temperature water quenching |
| CN103290320B (en) * | 2013-04-28 | 2015-06-24 | 首钢总公司 | Hot rolling multiphase steel and production method thereof |
| CN106399820B (en) * | 2016-06-21 | 2018-10-02 | 宝山钢铁股份有限公司 | A kind of 980MPa grades of hot rolling high-chambering dual phase steel and its manufacturing method |
| CN106734200B (en) * | 2016-12-27 | 2018-05-08 | 中冶南方工程技术有限公司 | A kind of method using continuous casting and rolling technique of sheet bar production Thin Specs dual phase steel |
| CN107043890B (en) * | 2017-03-28 | 2019-03-26 | 马钢(集团)控股有限公司 | A kind of 1.5~3.0mm of thickness yield strength is greater than the Hot Rolling Automobile steel and its manufacturing method of 700MPa |
-
2017
- 2017-09-20 CN CN201710854492.4A patent/CN107695099B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107695099A (en) | 2018-02-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107695099B (en) | Method based on CSP process production thin gauge hot rolling DP600 steel | |
| CN107641699B (en) | Method based on CSP process production thin gauge hot rolling DP780 steel | |
| CN107716551B (en) | Method based on CSP process production thin gauge hot rolling DP980 steel | |
| CN107619993B (en) | Cold-rolled martensite steel plate with yield strength of 750MPa and manufacturing method thereof | |
| CN104278201B (en) | There is the preparation method of good cold formability high-carbon steel | |
| CN107641759A (en) | Method based on CSP flows production Thin Specs hot forming steel | |
| CN109161805B (en) | 590 MPa-grade automobile lightweight cold-rolled dual-phase steel and production method thereof | |
| CN104651734B (en) | 1000MPa grade high-strength high-ductility medium managese steel containing aluminum and its manufacture method | |
| CN101265550B (en) | Cold rolling automobile plate for micro-alloy high-strength steel stamping | |
| CN105838994B (en) | Chrome plating and its manufacture method, crown plug | |
| CN107058869A (en) | Ultralow yield tensile ratio 980MPa grades of cold-rolled biphase steels and its manufacture method | |
| CN111485177A (en) | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof | |
| CN104141099B (en) | A kind of manufacture method of super thick specification X70 hot-rolled sheet coil | |
| US20130104616A1 (en) | Method of production of pressed sheet parts with integrated preparation of blanks of non-uniform thickness | |
| CN105441786A (en) | Sheet steel with tensile strength of 1500 MPa levels and used for hot stamping forming and cast steel plate (CSP) production method thereof | |
| CN108411202A (en) | A kind of think gauge cold-rolled biphase steel and preparation method thereof | |
| CN112210724B (en) | ESP (electronic stability program) production-based high-strength hot forming steel and method | |
| CN105803313B (en) | A kind of Thin Specs hot-dip galvanizing sheet steel and its production method | |
| CN111534739A (en) | 980 MPa-grade high-formability cold-rolled phase-change induced plasticity steel and preparation method thereof | |
| CN107641700B (en) | Method based on CSP process production thin gauge hot rolling DP1180 steel | |
| CN105838991A (en) | Cold-rolled steel plate for household appliances and production method of cold-rolled steel plate | |
| CN107354376B (en) | Roll-forming 550MPa grades of cold-rolled steel sheets of yield strength and production method | |
| CN109321825B (en) | 450 MPa-grade automobile lightweight cold-rolled dual-phase steel and production method thereof | |
| CN105779888B (en) | A kind of hot rolling production method of carbon structural steels | |
| CN112226681A (en) | Low-cost high-strength galvanized sheet SGC570 for structure and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |