CN110004377A - A kind of automobile dual phase steel and its processing method - Google Patents

A kind of automobile dual phase steel and its processing method Download PDF

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Publication number
CN110004377A
CN110004377A CN201910250355.9A CN201910250355A CN110004377A CN 110004377 A CN110004377 A CN 110004377A CN 201910250355 A CN201910250355 A CN 201910250355A CN 110004377 A CN110004377 A CN 110004377A
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CN
China
Prior art keywords
temperature
dual phase
phase steel
processing method
automobile
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Pending
Application number
CN201910250355.9A
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Chinese (zh)
Inventor
张振卫
白少金
宋振官
孙广兴
楚斌
王海梁
段家庆
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Rizhao Steel Holding Group Co Ltd
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Rizhao Steel Holding Group Co Ltd
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Filing date
Publication date
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Priority to CN201910250355.9A priority Critical patent/CN110004377A/en
Publication of CN110004377A publication Critical patent/CN110004377A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B3/00Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02Rolling special iron alloys, e.g. stainless steel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2201/00Special rolling modes
    • B21B2201/04Ferritic rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2201/00Special rolling modes
    • B21B2201/16Two-phase or mixed-phase rolling

Abstract

The present invention provides a kind of automobile dual phase steel and its processing method, the chemical constituent of automobile dual phase steel is C≤0.08wt%, Mn is 1.25-1.35wt%, Ti is 0.01-0.025wt%, Nb is 0.02-0.03wt%, Cr is 0.15-0.25wt%, and Als 0.02-0.05wt%, surplus is Fe and inevitable impurity;Processing method includes: smelting, casting, heating, rolling, cooling and coiling process.Pass through the control to parameters such as roughing inlet temperature, finish rolling mill speed, finishing temperature, layer cold boiling water valve group number, coiling temperatures, on the basis of traditional strip Hot Line, realize the sub-sectional cooling of dual phase steel, to obtain the ideal structure of dual phase steel, and finally realize the steady production of dual phase steel.

Description

A kind of automobile dual phase steel and its processing method
Technical field
The present invention relates to technical field of ferrous metallurgy, and in particular to a kind of automobile dual phase steel and its processing method.
Background technique
With resource increasingly shortage and people to the growing of environmental protection attention degree, auto industry is gradually to vehicle Body lightweight, energy saving, safety coefficient is high, the methods of environmental-friendly development.To meet the energy conservation of car body loss of weight, endurance Performance and the strong requirement of anticollision performance, become the main trend of automobile production using the higher steel of thinner but intensity.
Dual phase steel refers to the steel being mainly made of ferrite and martensitic phase, can be by mild steel or low-alloy steel through critical zone heat It is obtained after processing or controlled rolling, by correct control composition and heat treatment process, dual phase steel can be made to be provided simultaneously with two-phase structure The characteristics of.Dual phase steel not only has good strong plasticity, and easy processing molding also has low yield tensile ratio and high elongation, together When dual phase steel baking hardenability and impact absorption performance it is also very excellent, be a kind of ideal automobile steel material.
Although dual phase steel has excellent processing performance and service performance, essence of the hot-rolled dual-phase steel to rolling mill practice temperature Spend more demanding, the problem of control bundle, control refrigeration technique always restriction hot-rolled dual-phase steel production.Traditional Hot Line, which generally comprises, to be added Hot-zone, roughing area, delay table, finish rolling area, cooling facility for laminar flow and coiling machine, wherein cooling facility for laminar flow only has conventional sparse Refrigerating mode, sub-sectional cooling technique needed for cannot achieve dual phase steel processing;And the rolling processing request coiling temperature of dual phase steel Lower, generally within the scope of 200-400 DEG C, and the finish-rolling process of traditional Hot Line is generally increasing speed rolling, air-cooled temperature, sky Cool time and coiling temperature can not stability contortings.
Summary of the invention
For the above-mentioned deficiency of the prior art, the present invention provides a kind of automobile dual phase steel and its processing method, by thick The control for rolling the parameters such as inlet temperature, finish rolling mill speed, finishing temperature, layer cold boiling water valve group number, coiling temperature, in conventional belt On the basis of steel Hot Line, the sub-sectional cooling of dual phase steel is realized, to obtain the ideal structure of dual phase steel, and finally realize The steady production of dual phase steel.
On the one hand, the present invention provides a kind of automobile dual phase steel, and the chemical constituent of automobile dual phase steel is C≤0.08wt%, Mn It is for 1.25-1.35wt%, Ti 0.01-0.025wt%, Nb 0.02-0.03wt%, Cr 0.15-0.25wt%, Als 0.02-0.05wt%, surplus are Fe and inevitable impurity.
On the other hand, the present invention provides a kind of processing method of automobile dual phase steel, and processing method includes: smelting, casting, adds Heat, rolling, cooling and coiling process.
Further, the processing method includes:
1) molten iron containing automobile two-phase tempering component is pre-processed and is smelted;
2) liquid metals after smelting is cast, obtains slab;
3) slab is placed in heating furnace and is heated;
4) it is rolled using two-part, controls 1020-1060 DEG C of roughing outlet temperature, control finish rolling constant speed rolling;
5) section cooling sub-sectional cooling mode is used, temperature drop pass corresponding with collector is calculated by Finite Element Simulation Software System calculates first and second section of boiled water collector radical according to finishing temperature, air-cooled temperature, coiling temperature, by controlling first segment layer The length of the cold not boiled water of the initial position control layer of cold final position and second segment controls air cooling time.
Further, the soaking temperature of heating furnace is 1220-1260 DEG C.
Further, the acceleration for limiting milling equipment is controlled by level-one, cancels second-level model temperature scaling factor, limit Determining final rolling temperature acceleration is 0m/s2
Realize finish rolling constant speed rolling, velocity deviation by 0.5~2.0m/s is before reduced to 0m/s to strip end to end.Speed is steady It is set to the cold technique of succeeding layer and provides very favorable basis.
Further, the corresponding relationship of temperature drop and collector is every collector temperature drop of coarse adjustment section at 15-30 DEG C, accurate adjustment section every Collector temperature drop is at 10-20 DEG C.
According to the corresponding relationship regulating course cold boiling water length of temperature drop and collector, sub-sectional cooling needed for realizing dual phase steel, and Air-cooled temperature, air cooling time, coiling temperature are stably and controllable.
Further, reduce the temperature deviation of intermediate base end to end using Coil Box, be equipped with cooling water between finishing rolling mill, according to The interstand cooling water of the manually opened 30%-60% of real-time finishing temperature curve.
Finishing speeds are constant, and intermediate base head and tail temperature difference can not be eliminated, and will necessarily cause the fluctuation of finishing temperature, use heat It rolls up case and manual mode opens interstand cooling water, practical finishing temperature is made to be reduced to ± 15 DEG C by -30-40 DEG C of target deviation, Reduce air-cooled temperature and coiling temperature fluctuation because of caused by finishing temperature fluctuation.
Further, finishing speeds 2-5m/s.
The beneficial effects of the present invention are,
A kind of automobile dual phase steel provided by the invention and its processing method, by limiting first device, second-level model is realized Finish rolling constant speed rolling is provided with niche plinth for key process parameters such as the air-cooled temperature of rear process, air cooling time, coiling temperatures;It gives Set the goal speed, stablizes roughing outlet temperature, by controlling the unlatching and water of finishing rolling mill cooling water, controls finishing temperature; Section cooling manually controls position and the radical of collector unlatching, realizes sub-sectional cooling, and empty according to the cooling temperature of every collector Cool time, air-cooled temperature are stably and controllable;It ensure that technological temperature stability, successfully roll out the qualified two-phase of performance, tissue Steel, and realize batch production.
Pass through the yield strength >=300MPa for the dual phase steel that this processing method is processed, tensile strength >=540MPa, elongation percentage >=28%.
Detailed description of the invention
Fig. 1 is the finishing speeds figure of the prior art;
Fig. 2 is 1 finishing speeds figure of the embodiment of the present invention;
Fig. 3 is the finishing temperature figure of the prior art;
Fig. 4 is the finishing temperature figure of the embodiment of the present invention 1;
Fig. 5 is the SEM organization chart of the automobile dual phase steel of the embodiment of the present invention 1.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention below will be implemented the present invention Technical solution in example is clearly and completely described, it is clear that described embodiment is only that present invention a part is implemented Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness Every other embodiment obtained, should fall within the scope of the present invention under the premise of labour.
Embodiment 1
As Figure 1-Figure 5, the chemical constituent of automobile dual phase steel is C:0.06wt%, and Mn 1.28wt%, Ti are 0.015wt%, Nb 0.023wt%, Cr 0.18wt%, Als 0.03wt%, surplus be Fe and inevitable impurity, Dual phase steel with a thickness of 6mm, the preparation method of dual phase steel includes:
1) molten iron containing automobile two-phase tempering component is pre-processed and is smelted;
2) liquid metals after smelting is cast, obtains slab;
3) slab is placed in heating furnace and is heated, the soaking temperature of heating furnace is 1235 DEG C;
4) it uses two-part to roll, controls 1025 DEG C of roughing outlet temperature, controlled by level-one and limit adding for milling equipment Speed limits final rolling temperature acceleration as 0m/s2, cancel second-level model temperature scaling factor, reduce intermediate base using Coil Box Temperature deviation end to end is equipped with 1 group of cooling water between finishing rolling mill, according to the real-time manually opened 30%-60% of finishing temperature curve Interstand cooling water, realize finish rolling constant speed carry out, finishing speeds 3.92m/s, finishing temperature be 820 ± 15 DEG C;
5) section cooling sub-sectional cooling mode is used, temperature drop pass corresponding with collector is calculated by Finite Element Simulation Software System, every collector temperature drop of coarse adjustment section are 25 DEG C, and every collector temperature drop of accurate adjustment section is at 15 DEG C, according to finishing temperature, air-cooled temperature, volume The boiled water collector radical for taking first and second section of temperature computation, by the start bit for controlling first segment layer cold final position and second segment The length of the cold not boiled water of control layer is set, air cooling time is controlled, specific cooling parameter is as shown in table 1 below.
Table 1
Through the above as can be seen that automobile dual phase steel provided in this embodiment and its processing method, pass through control essence Temperature, speed and cooling velocity are rolled, keeps two-phase steel organization ratio more reasonable, performance is more stable.
Fig. 1 and Fig. 2 is the finishing speeds figure of the prior art and the present embodiment respectively, it can be seen that the present embodiment passes through level-one Control limits the acceleration of milling equipment, limits final rolling temperature acceleration as 0m/s2The constant speed for realizing finish rolling carries out.
Fig. 3 and Fig. 4 is respectively the final rolling temperature figure of the prior art and the present embodiment, it can be seen that the present embodiment passes through cancellation Second-level model temperature scaling factor reduces the temperature deviation of intermediate base end to end using Coil Box, is equipped with 1 group of cooling between finishing rolling mill Water ensure that technological temperature stability according to the interstand cooling water of the real-time manually opened 30%-60% of finishing temperature curve.
Fig. 5 is the SEM figure for the automobile dual phase steel that the present embodiment obtains, and as seen from Figure 5, the tissue of the dual phase steel is iron Ferritic+martensite, and have beneficial uniformity.Specific performance is as shown in table 2 below.
Table 2
Embodiment 2
The chemical constituent of automobile dual phase steel is C:0.05wt%, and Mn 1.33wt%, Ti 0.020wt%, Nb are 0.028wt%, Cr 0.22wt%, Als 0.04wt%, surplus be Fe and inevitable impurity, dual phase steel with a thickness of The preparation method of 11mm, dual phase steel includes:
1) molten iron containing automobile two-phase tempering component is pre-processed and is smelted;
2) liquid metals after smelting is cast, obtains slab;
3) slab is placed in heating furnace and is heated, the soaking temperature of heating furnace is 1235 DEG C;
4) it uses two-part to roll, controls 1040 DEG C of roughing outlet temperature, controlled by level-one and limit adding for milling equipment Speed limits final rolling temperature acceleration as 0m/s2, cancel second-level model temperature scaling factor, reduce intermediate base using Coil Box Temperature deviation end to end is equipped with 3 groups of cooling waters between finishing rolling mill, according to the real-time manually opened 30%-60% of finishing temperature curve Interstand cooling water, finishing speeds 2.5m/s, finishing temperature be 830 ± 15 DEG C;
5) section cooling sub-sectional cooling mode is used, temperature drop pass corresponding with collector is calculated by Finite Element Simulation Software System, every collector temperature drop of coarse adjustment section are 20 DEG C, and every collector temperature drop of accurate adjustment section is at 15 DEG C, according to finishing temperature, air-cooled temperature, volume The boiled water collector radical for taking first and second section of temperature computation, by the start bit for controlling first segment layer cold final position and second segment The length of the cold not boiled water of control layer is set, air cooling time is controlled, specific cooling parameter is as shown in table 3 below.
Table 3
First segment heat water valve collector number Second segment heat water valve collector number Not boiled water length Air cooling time
It is upper and lower: 6/8 It is upper and lower: 18/24 18.2m 7.2s
Although the present invention is not limited thereto to the present invention have been described in detail by way of preferred embodiment.? Under the premise of not departing from spirit and substance of the present invention, those of ordinary skill in the art can carry out the embodiment of the present invention each Kind equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/any be familiar with this technology neck The technical staff in domain in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover of the invention Within protection scope.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. a kind of automobile dual phase steel, which is characterized in that the chemical component of automobile dual phase steel is C≤0.08wt%, Mn 1.25- 1.35wt%, Ti 0.01-0.025wt%, Nb 0.02-0.03wt%, Cr 0.15-0.25wt%, Als 0.02- 0.05wt%, surplus are Fe and inevitable impurity.
2. a kind of processing method of automobile dual phase steel as described in claim 1, which is characterized in that processing method include: smelt, Casting, heating, rolling, cooling and coiling process.
3. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that the processing method packet It includes:
1) molten iron containing automobile two-phase tempering component is pre-processed and is smelted;
2) liquid metals after smelting is cast, obtains slab;
3) slab is placed in heating furnace and is heated;
4) it is rolled using two-part, controls 1020-1060 DEG C of roughing outlet temperature, control finish rolling constant speed rolling;
5) section cooling sub-sectional cooling mode is used, the corresponding relationship of temperature drop and collector is calculated by Finite Element Simulation Software, The boiled water collector radical that first and second section is calculated according to finishing temperature, air-cooled temperature, coiling temperature, it is cold by control first segment layer The length of the cold not boiled water of the initial position control layer of final position and second segment controls air cooling time.
4. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that the soaking temperature of heating furnace It is 1220-1260 DEG C.
5. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that controlled and limited by level-one The acceleration of milling equipment cancels second-level model temperature scaling factor, limits final rolling temperature acceleration as 0m/s2
6. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that temperature drop is corresponding with collector Relationship is every collector temperature drop of coarse adjustment section at 15-30 DEG C, and every collector temperature drop of accurate adjustment section is at 10-20 DEG C.
7. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that using in Coil Box reduction Between the temperature deviation of base end to end, cooling water is equipped between finishing rolling mill, according to the real-time manually opened 30%-60% of finishing temperature curve Interstand cooling water.
8. a kind of processing method of automobile dual phase steel according to claim 2, which is characterized in that finishing speeds 2-5m/ s。
CN201910250355.9A 2019-03-29 2019-03-29 A kind of automobile dual phase steel and its processing method Pending CN110004377A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113106219A (en) * 2021-04-13 2021-07-13 攀钢集团西昌钢钒有限公司 Method for improving thickness precision of ultrahigh-strength cold-rolled dual-phase steel
CN113680833A (en) * 2021-08-06 2021-11-23 唐山钢铁集团有限责任公司 Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling

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* Cited by examiner, † Cited by third party
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CN113106219A (en) * 2021-04-13 2021-07-13 攀钢集团西昌钢钒有限公司 Method for improving thickness precision of ultrahigh-strength cold-rolled dual-phase steel
CN113680833A (en) * 2021-08-06 2021-11-23 唐山钢铁集团有限责任公司 Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling

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Application publication date: 20190712