CN107695099A - Method based on CSP flows production Thin Specs hot rolling DP600 steel - Google Patents
Method based on CSP flows production Thin Specs hot rolling DP600 steel Download PDFInfo
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- 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
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- 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
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
The invention discloses a kind of method based on CSP flows production Thin Specs hot rolling DP600 steel, comprise the following steps：1) molten iron component is adjusted；2) sheet blank continuous casting, it is 52~55mm to control slab thickness, and casting speed is 3.8~4.2m/min；3) conventional soaking, it is 1190~1210 DEG C to control tapping temperature, 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) two-stage cooling and batch, first paragraph water cooling is to 670~690 DEG C, then 4.0~6.6s of air cooling, and second segment water cooling is to 100~150 DEG C；7) carry out smooth.Properties of product of the present invention are stable, have the characteristics of low cost, high intensity, Thin Specs and low yield strength ratio, can reach the quality requirement of cold-rolled products, to promoting " being significant with hot Dai Leng " processes for auto industry.
Description
Technical field
The present invention relates to a kind of hot rolling DP600 steel, particularly relates to a kind of based on CSP flows production Thin Specs hot rolling DP600
The method of steel.
Background technology
With the increasingly depleted of the energy and the deterioration of ecological environment, the lightweight of automobile increasingly attracts attention.Use height
Performance automobiles are to realize that automobile loss of weight saves, improved the effective means of security with steel.Dual phase steel abbreviation DP steel, is by ferrite
The advanced high-strength steel formed with martensite two-phase structure, because of its low yield strength ratio, high initial manufacture hardening ratio, good strong plasticity
Match somebody with somebody and baking and hardening performance etc., the application demand of automobile various structures part, reinforcer and anti-striker can be met, turn into current application
Amount is maximum, the vehicle structure steel of most species.
DP steel is broadly divided into hot rolling DP steel and the class of cold rolling DP steel two, compared with cold rolling DP steel, hot rolling DP steel by the mode of production
Have the advantages that cost is low, production procedure is easy and combination property is good.At present, automobile market is in great demand to DP steel, " with
Hot Dai Leng " Thin Specs hot rolling DP steel 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 flow, because being limited by strip increasing speed rolling and technology controlling and process precision, its chilling temperature and time
It is difficult to accurately control so that the controllability of two-phase proportion is poor in duplex structure, and it is unstable to easily cause performance.Therefore,
Traditional hot continuous rolling producing line need to generally use Coil Box or stay-warm case to ensure the stability of technical process.Meanwhile part producing line is cold
But ability is relatively low, can only produce medium temperature and batch type hot rolling DP600 steel (this steel need to generally add the expensive alloying element such as Mo),
It is difficult to the duplex structure for economically obtaining ferrite and martensite, and product thickness specification is in more than 2.0mm.
Bar strip continuous casting and rolling flow path is organically combined the processes such as the continuous casting of traditional process, heating, rolling, flow letter
About efficiently, energy-conserving and environment-protective., can be with the stable low temperature of production performance using the characteristics of its mill speed is constant, cooling capacity is stronger
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 techniques
Method " (publication No. CN101906571A) discloses one kind and uses C-Mn-Cr component systems, and the good low temperature of surface quality batches type
The manufacture method of hot-rolled dual-phase steel, described hot-rolled dual-phase steel intensity rank in more than 590MPa, coiling temperature 210 DEG C with
Under, structure property control is stable, 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 manufacture method of the kind based on CSP techniques " (publication No. CN104593665A) discloses one kind and uses C-
Mn component systems, the manufacture method of industrialized mass production 590MPa level dual phase steels, described hot-rolled dual-phase steel coiling temperature are
150~250 DEG C, excellent performance is stable, thickness specification 11.0mm.Above-mentioned two document and existing CSP technique productions are
The hot-rolled dual-phase steel of think gauge, it is impossible to meet automobile industry to " the needs of with hot Dai Leng " Thin Specs hot-rolled dual-phase steel.
In CSP production Thin Specs especially mistake of the thickness specification in below 1.5mm hot rolling DP600 steel
Cheng Zhong, water cooling time and air cooling time short so that iron plain short and Final Stand Rolling is fireballing influences by section cooling section length
Body transformation is insufficient, and martensite content is too high or even bainite and pearlite occurs, and product yield tensile ratio is higher.Simultaneously as adopt
Batched with low temperature, the plate shape of Thin Specs 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 raise, cause the forming property of hot rolling DP600 steel poor, add part punching mistake
Abrasion to mould and springback capacity in journey.Therefore, it is (thick for Thin Specs under the conditions of existing bar strip continuous casting and rolling flow path
Degree≤2.0mm) hot rolling DP600 steel, it is difficult to chemical composition, process window, structure property, the stable matching of strip shape quality are realized,
Constrain such shaped steel industrialized production and auto industry " with hot Dai Leng " processes.
The content of the invention
It is an object of the invention to provide a kind of method based on CSP flows production Thin Specs hot rolling DP600 steel, Neng Gousheng
Produce high intensity, low yield strength ratio, available for the Thin Specs hot rolling DP600 steel 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 flows production Thin Specs hot rolling DP600 steel,
Comprise the following steps：
1) by smelt refining etc. mode adjust molten iron component, using ensure hot rolling DP600 steel finished products meet component requirements as
It is accurate；
2) sheet blank continuous casting is carried out, it is 52~55mm to control slab thickness, and casting speed is 3.8~4.2m/min；
3) conventional soaking being carried out to strand, and it is 1190~1210 DEG C to control tapping temperature, soaking time is 25~
35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be 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 frame roll gap cooling water sequential, it is ensured that reach each frame in strip steel head
The gap cooling water of the frame is opened before；
6) cooled down and batched, the cooling uses two-stage cooling mode, and belt steel temperature is down to by first paragraph water cooling
670~690 DEG C, then 4.0~6.6s of air cooling, 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, the martensite content in hot rolling DP600 steel is reached required volume integral
Number；Batched after two-stage cooling；
7) carry out smooth, carried out after steel roll temperature is down to below 50 DEG C smooth, work roll for temper mill uses 20 μm of convex rollers, makes
With positive roller control model, and skin pass rolling power is controlled within 160t, while ensureing 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；
The hot rolling DP600 steel as made from above-mentioned steps, its elemental constituent included and weight percent content (i.e. step
1) component requirements described in) it is 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 be 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 comprises 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 stove refinings.
Preferably, in step 5), F1~F4 frame roll gap cooling water timing settings are：F1=12m, F2=17m, F3=
21.5m F4=26m.Frame roll gap cooling water opens sequential on the basis of soaking outlet of still.For example, F1 frame roll gap cooling waters
Timing settings are 12m, represent that F1 frame roll gap cooling waters are opened in slab head after going out 12 meters of soaking pit；F2 frame roll gap cooling waters
Timing settings are 17m, represent that F2 frame roll gap cooling waters are opened in slab head after going out 17 meters of soaking pit.
Preferably, in step 5), F7 frames AGC (gauge automatic control) amplitude limit value is set as 0.6~1.0mm, F6 machines
Frame AGC amplitude limit values are set as 0.8~1.2mm, while thin material rolling stability is ensured, improve belt steel thickness precision.
Preferably, in step 6), it is 78~85% to adjust ferritic volume fraction in hot rolling DP600 steel；Martensite
Volume fraction is 15~22%.
Preferably, in step 6), in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of
Start side spray, and start blower fan and purged, to remove belt steel surface residual water, realize that temperature accurately controls, and carry
The accuracy of high detection device temperature measurement.
Preferably, the hot rolling DP600 steel produced, its 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, available for replacement 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 building pressure into completion before de-scaling in strip steel head reaches de-scaling water pressure
Open F1~F4 frame roll gap cooling waters in advance into desired value, and step 5), be for reducing strip steel head temperature, make
Strip total length temperature is uniform, to ensure operation of rolling constant airspeed, improves the controllability of two-phase proportion in duplex structure, reaches production
The purpose of product stable performance.
2) in step 5), F7 frames AGC (gauge automatic control) amplitude limit value is preferably set as 0.6~1.0mm, F6 frames
AGC amplitude limit values are set as 0.8~1.2mm, while being to improve belt steel thickness precision, it is ensured that Thin Specs hot rolling DP600 steel
The stability of rolling.The ability that the too small meeting limited thickness of AGC amplitude limit values setting automatically controls, the setting of AGC amplitude limit values 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 production stable and antegrade.
3) it is 6.6~10.2m/s to control Final Stand Rolling speed in step 5), and two stage type cooling is used in step 6)
Belt steel temperature is down to 670~690 DEG C by skill, first paragraph cooling, and then 4.0~6.6s of air cooling, is in order that in hot rolling DP600 steel
Ferrite content reach required volume fraction；Belt steel temperature is down to 100~150 DEG C by second segment cooling, is in order that heat
Roll the volume fraction that the martensite content in DP600 steel reaches required, the volume integral in the hot rolling DP600 steel needed for ferrite
Number is 78~85%, and the volume fraction needed for martensite is 15~22%, is the key technology of the present invention.
4) in step 6), preferably in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of
Start that the side spray sprinkler of active side (be located at) carries out water spray and blower fan (being located at side spray the same side) is purged, be in order to
Belt steel surface residual water is removed, realizes that temperature accurately controls, and improve the accuracy of detection device temperature survey.
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 ensure that finished strip strip shape quality is good, reduces material yield strength and yield tensile ratio
Elevation amplitude, to obtain the hot rolling DP600 steel of low yield strength ratio, improve the forming property of material, it is right during part punching to reduce
The abrasion of mould and springback capacity, it is the key technology of the present invention.
Compared with prior art, the present invention has advantages below：
1) CSP technique productions Thin Specs hot rolling DP600 steel is used, for substituting the cold rolling DP600 steel of condition of equivalent thickness specification,
Follow-up cold rolling and annealing are not needed, cost can be greatly reduced, shortens production procedure, and energy-conserving and environment-protective；Simultaneously can also
The problem of enough avoiding higher existing thin plate blank continuously casting and continuously rolling technology production Thin Specs hot rolling DP600 steel yield tensile ratios, deformed steel strip.
2) the Thin Specs hot rolling DP600 steel produced can effectively obtain ferrite+martensite duplex structure, thickness specification
For 1.0~2.0mm, the yield strength of material tensile strength >=600MPa, elongation percentage A50 >=23%, is bent up to 330~420MPa
Strong ratio≤0.60, possesses the characteristics of low cost, high intensity, Thin Specs and low yield strength ratio.
3) flow of the present invention is short, and properties of product are stable, and strip shape quality is good, and thickness and precision is high, can reach cold-rolled products
Quality requirement, available for the cold rolling DP600 steel for substituting condition of equivalent thickness specification, complex deformation, and rebounds upon deformation can be smoothly completed
It is small, to promoting " being significant with hot Dai Leng " processes for auto industry.
Brief description of the drawings
The metallographic structure figure for the Thin Specs hot rolling DP600 steel that Fig. 1 is produced by the embodiment of the present invention 3.
Embodiment
Method provided by the present invention based on CSP flows production Thin Specs 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 stove refinings；
3) sheet blank continuous casting, it is 52~55mm to control slab thickness, and casting speed is 3.8~4.2m/min；
4) conventional soaking being carried out to strand, and it is 1190~1210 DEG C to control tapping temperature, soaking time is 25~
35min；
5) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be 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 frame roll gap cooling water sequential is adjusted, F1 setting values are 12m, and F2 setting values are 17m, and F3 setting values are
21.5m, F4 setting value are 26m, to ensure to open before strip steel head reaches the frame；
F7 frame AGC amplitude limit values are set as 0.6~1.0mm, F6 frame AGC amplitude limit values are set as 0.8~1.2mm,
While ensuring thin material rolling stability, belt steel thickness precision is improved；
7) cooled down and batched, the cooling uses two-stage cooling mode, and first paragraph uses water cooling by belt steel temperature
670~690 DEG C are down to, then 4.0~6.6s of air cooling, the ferrite content in hot rolling DP600 steel is reached required volume integral
Number；Belt steel temperature is down to 100~150 DEG C by second segment using water cooling, the martensite content in hot rolling DP600 steel is reached required
Volume fraction, batched afterwards；Volume fraction in the hot rolling DP600 steel needed for ferrite is 78~85%, geneva
Volume fraction needed for body is 15~22%；
In the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of start side spray, and
Start blower fan to be purged, to remove belt steel surface residual water, realize that temperature accurately controls, and improve the survey of detection device temperature
The accuracy of amount.
8) progress is smooth, is carried out after steel roll temperature is down to below 50 DEG C 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 ensureing finished strip strip shape quality, reduce material yield strength and the elevation amplitude of yield tensile ratio, to obtain low yield strength ratio
Hot rolling DP600 steel.
9) process after carrying out.
The hot rolling DP600 steel as made from above-mentioned steps, its elemental constituent included and weight percent content 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.
Embodiment 1~6
By above-mentioned steps, in embodiment 1~6, the chemical composition and its percetage by weight of Thin Specs hot rolling DP600 steel are shown in Table
1。
By above-mentioned steps, in embodiment 1~6, the main technologic parameters that Thin Specs hot rolling DP600 steel production processes are related to take
Value is shown in Table 2.
By above-mentioned steps, in embodiment 1~6, the structure property detection of Thin Specs hot rolling DP600 steel and quality condition are shown in Table
3。
The chemical composition comparative example (wt%) of 1 embodiment of table 1~6
| 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 |
The main technologic parameters comparative example of 2 embodiment of table 1~6
The structure property of 3 embodiment of table 1~6 detects and quality in kind situation list
From table 1~3 as can be seen that Thin Specs hot rolling DP600 steel of the present invention based on the production of CSP flows, thickness specification are
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, possesses the characteristics of low cost, high intensity, Thin Specs and low yield strength ratio.It can be used for automobile A, B in automobile steel
Post inner panel etc..
Fig. 1 gives the metallographic structure figure for the Thin Specs hot rolling DP600 steel that embodiment 3 is produced, as can be seen from the figure
DP600 finished products are organized as the island-like martensite of ferrite+Dispersed precipitate of polygon, and grain size number is 12.5~13.0 grades.
Claims (8)
- A kind of 1. method based on CSP flows production Thin Specs hot rolling DP600 steel, it is characterised in that：Comprise the following steps：1) molten iron component is adjusted, to ensure that hot rolling DP600 steel finished products meet that component requirements are defined；2) sheet blank continuous casting is carried out, it is 52~55mm to control slab thickness, and casting speed is 3.8~4.2m/min；3) conventional soaking is carried out to strand, and it is 1190~1210 DEG C to control tapping temperature, soaking time is 25~35min；4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be not less than 180bar, outlet pressure is not less than 220bar, removed 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, it is 790~820 DEG C to control finishing temperature, and it is 6.6~10.2m/ to control Final Stand Rolling speed S, and carry out constant speed rolling；Adjust F1~F4 frame roll gap cooling water sequential, it is ensured that opened before strip steel head reaches each frame Open the gap cooling water of the frame；6) being cooled down and batched, the cooling uses two-stage cooling mode, and belt steel temperature is down to 670 by first paragraph water cooling~ 690 DEG C, then 4.0~6.6s of air cooling, 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, the martensite content in hot rolling DP600 steel is reached required volume fraction；Two Batched after segmentation cooling；7) carried out after steel roll temperature is down to below 50 DEG C smooth, work roll for temper mill uses 20 μm of convex rollers, is controlled using positive roller Pattern, and skin pass rolling power is controlled within 160t；The hot rolling DP600 steel as made from above-mentioned steps, its elemental constituent included and weight percent content 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 flows production Thin Specs 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 flows production Thin Specs hot rolling DP600 steel, it is characterised in that：Step It is rapid 1) in, adjustment molten iron component comprise the following steps：1.1) desulfurizing iron, and S≤0.001% is controlled, molten iron is exposed after skimming Face >=96%；1.2) converter smelting is carried out, and carries out LF stove refinings.
- 4. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP600 steel method, its It is characterised by：In step 5), F1~F4 frame roll gap cooling water timing settings are：F1=12m, F2=17m, F3=21.5m, F4 =26m.
- 5. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP600 steel method, its It is characterised by：In step 5), F7 frame AGC amplitude limit values are set as 0.6~1.0mm, F6 frame AGC amplitude limit values are set as 0.8 ~1.2mm.
- 6. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP600 steel method, its It is characterised by：In step 6), it is 78~85% to adjust ferritic volume fraction in hot rolling DP600 steel, the volume integral of martensite Number is 15~22%.
- 7. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP600 steel method, its It is characterised by：In step 6), in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of start Side spray is sprayed water, and is started blower fan and purged, to remove belt steel surface residual water.
- 8. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP600 steel method, its It is characterised by：The hot rolling DP600 steel produced, its thickness specification are 1.0~2.0mm, the yield strength of material for 330~ 420MPa, tensile strength >=600MPa, elongation percentage A50 >=23%, yield tensile ratio≤0.60.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108546872A (en) * | 2018-04-13 | 2018-09-18 | 武汉钢铁有限公司 | Tensile strength >=600MPa hot rolling two-phase sheet metals and method are produced with CSP producing lines |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793398A (en) * | 2005-12-27 | 2006-06-28 | 东北大学 | Strength of extension 1000 MPa grade complex phase steel plate and mfg. method thereof |
| JP2009024227A (en) * | 2007-07-20 | 2009-02-05 | Nippon Steel Corp | Dual-phase steel sheet superior in formability, and manufacturing method therefor |
| CN103290320A (en) * | 2013-04-28 | 2013-09-11 | 首钢总公司 | Hot rolling multiphase steel and production method thereof |
| 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 |
| WO2014149505A1 (en) * | 2013-03-15 | 2014-09-25 | Thyssenkrupp Steel Usa, Llc | Method of producting hot rolled high strength dual phase steels using room temperature water quenching |
| CN106399820A (en) * | 2016-06-21 | 2017-02-15 | 宝山钢铁股份有限公司 | 980-MPa-grade hot-rolled high-hole-expansion double-phase steel and manufacturing method thereof |
| CN106734200A (en) * | 2016-12-27 | 2017-05-31 | 中冶南方工程技术有限公司 | A kind of method that application continuous casting and rolling technique of sheet bar produces Thin Specs dual phase steel |
| CN107043890A (en) * | 2017-03-28 | 2017-08-15 | 马钢(集团)控股有限公司 | A kind of 1.5~3.0mm of thickness yield strengths are more than 700MPa Hot Rolling Automobile steel and its manufacture method |
-
2017
- 2017-09-20 CN CN201710854492.4A patent/CN107695099B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793398A (en) * | 2005-12-27 | 2006-06-28 | 东北大学 | Strength of extension 1000 MPa grade complex phase steel plate and mfg. method thereof |
| JP2009024227A (en) * | 2007-07-20 | 2009-02-05 | Nippon Steel Corp | Dual-phase steel sheet superior in formability, and manufacturing method therefor |
| 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 |
| WO2014149505A1 (en) * | 2013-03-15 | 2014-09-25 | Thyssenkrupp Steel Usa, Llc | Method of producting hot rolled high strength dual phase steels using room temperature water quenching |
| CN103290320A (en) * | 2013-04-28 | 2013-09-11 | 首钢总公司 | Hot rolling multiphase steel and production method thereof |
| CN106399820A (en) * | 2016-06-21 | 2017-02-15 | 宝山钢铁股份有限公司 | 980-MPa-grade hot-rolled high-hole-expansion double-phase steel and manufacturing method thereof |
| CN106734200A (en) * | 2016-12-27 | 2017-05-31 | 中冶南方工程技术有限公司 | A kind of method that application continuous casting and rolling technique of sheet bar produces Thin Specs dual phase steel |
| CN107043890A (en) * | 2017-03-28 | 2017-08-15 | 马钢(集团)控股有限公司 | A kind of 1.5~3.0mm of thickness yield strengths are more than 700MPa Hot Rolling Automobile steel and its manufacture method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108546872A (en) * | 2018-04-13 | 2018-09-18 | 武汉钢铁有限公司 | Tensile strength >=600MPa hot rolling two-phase sheet metals and method are produced with CSP producing lines |
| 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 |
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN108971224A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of checkered steel plate and its production method |
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| 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 |
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