CN106011618B - Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel - Google Patents
Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel Download PDFInfo
- Publication number
- CN106011618B CN106011618B CN201610393922.2A CN201610393922A CN106011618B CN 106011618 B CN106011618 B CN 106011618B CN 201610393922 A CN201610393922 A CN 201610393922A CN 106011618 B CN106011618 B CN 106011618B
- Authority
- CN
- China
- Prior art keywords
- steel
- strip
- hot
- raw material
- esp
- 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
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, including：Raw material are selected, wherein, raw material include by mass percentage：0.06~0.20% C, 0.2~0.6% Si, 1.2~2.0% Mn, 0.1~0.5% Cr ,≤0.3% Mo, 0.02~0.05% Nb ,≤0.012% S ,≤0.015% P, 0.1%~0.5% Cu, remaining is ferro element；Raw material are subjected to converter smelting and LF stoves are smelted；Hot-strip of the molten steel to be formed by ESP producing lines generation different-thickness will be smelted from LF stoves, wherein, in ESP producing lines, the temperature of roughing outlet is 800 DEG C~860 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C；Determine ratio needed for the ferrite and martensite in hot-strip successively by secondary cooling hot-strip.It can achieve the purpose that energy conservation and environmental protection using the present invention and reduce cost.
Description
Technical field
The present invention relates to steel technical fields, more specifically, are related to a kind of based on the life of ESP bar strip continuous casting and rolling flow paths
The method for producing dual phase steel DP780 steel.
Background technology
In recent years, persistently dropping with steel market, steel are constantly in meagre profit or without sharp states, force steel producer
Have to inquire into Jiang Benzhi roads, and the domestic attention degree to environmental protection is further strengthened at present, therefore inquire into drop this environmental protection again
Process for producing steel and iron has become the road of the very necessary existence of steel producer.
Therefore, ESP development and application new products is made full use of to meet national overall planning and sector planning, meet national modulation
Relevant policies regulation is created, disclosure satisfy that technique modernization, equipment enlarging, production intensification, resource and energy cycleization, energy consumption
It minimizes, the optimized high start developing goal of economic benefit, for promoting steel industry energy-saving and emission-reduction and technological progress, promotes
Enterprise transformation upgrading, scientific and technical innovation and product restructuring, all have a very important significance.
Wherein, ESP (Endless Strip Production, strip production without a head) line, be that AVM hereinafter enlightening creates new one
For sheet billet continuous casting and rolling production line, since its casting speed reaches as high as 7m/min, one is poured and time can produce a whole steel band,
Centre is without any cutting head cutting tail, thus with the production of Total continuity strip, single continuous casting line can reach outstanding production capacity,
Large-scale production greatly with wide flat steel and quality strip steel, the conversion cost from molten steel to hot rolled coil be low, production-line technique arrangement the most
The features such as compact.
Wherein, dual phase steel has coordinating, well for low yield strength ratio, high initial manufacture hardening ratio, good intensity and plasticity
Forming property and the advantages that energy absorption, have been developed as a kind of stamping high-strength automobile steel.
In conclusion for energy conservation and environmental protection and reducing cost, the present invention is proposed based on ESP thin slab continuous casting and rolling streams
The method that journey produces dual phase steel DP780 steel.
Invention content
In view of the above problems, DP780 is produced based on ESP bar strip continuous casting and rolling flow paths the object of the present invention is to provide one kind
The method of steel achievees the purpose that energy conservation and environmental protection and reduces cost.
The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, including：Selection is former
Material, wherein, raw material include by mass percentage：0.06~0.20% C, 0.2~0.6% Si, 1.2~2.0%
Mn, 0.1~0.5% Cr ,≤0.3% Mo, 0.02~0.05% Nb ,≤0.012% S ,≤0.015% P,
0.1%~0.5% Cu, remaining is ferro element；Raw material are subjected to converter smelting and LF stoves are smelted；Shape will be smelted from LF stoves
Into molten steel by ESP producing lines generation different-thickness hot-strip, wherein, in ESP producing lines, roughing outlet temperature be
800~860 DEG C, the temperature of finish rolling outlet is not less than 800 DEG C；It is determined in hot-strip successively by secondary cooling hot-strip
Ferrite and martensite needed for ratio；Wherein, after hot-strip first being cooled to 600~750 DEG C, and 2~10s is kept the temperature, made
Ferrite content in hot-strip reaches ratio needed for DP780 steel；Then rapid cooling hot-rolled strip makes to 150~350 DEG C
Martensite content in strip reaches ratio needed for DP780 steel.
Furthermore it is preferred that scheme be that in ESP producing lines, the temperature of roughing entrance is not less than 950 DEG C, sensing heating outlet
Temperature be 1120~1180 DEG C.
Furthermore it is preferred that scheme be, by secondary cooling hot-strip successively determine hot-strip in ferrite and
During ratio needed for martensite, the ratio 5 of ferrite and martensite:1.
Furthermore it is preferred that scheme be that the thickness of hot-strip is 1.5mm~6.0mm.
Furthermore it is preferred that scheme be that during DP780 steel is generated, C in raw material is formed needed for DP780 steel
Martensite, to ensure the intensity of DP780 steel.
Furthermore it is preferred that scheme be that during DP780 steel is generated, Si in raw material is formed needed for DP780 steel
Ferrite.
From technical solution above it is found that provided by the invention produce DP780 steel based on ESP bar strip continuous casting and rolling flow paths
Method, by using ESP Process Production DP780 steel, directly generate various thickness specification strips from continuous casting, be not only able to energy saving
Environmental protection but also it can reduce cost.
In order to realize above-mentioned and related purpose, one or more aspects of the invention include will be explained in below and
The feature particularly pointed out in claim.Certain illustrative aspects of the present invention are described in detail in following explanation and attached drawing.
However, some modes in the various modes that the principle of the present invention only can be used that these aspects indicate.It is in addition, of the invention
It is intended to include all these aspects and their equivalent.
Description of the drawings
By reference to the explanation and the content of claims below in conjunction with attached drawing, and with to the present invention more comprehensively
Understand, other purposes of the invention and result will be more apparent and should be readily appreciated that.In the accompanying drawings：
Fig. 1 is the method flow that DP780 steel is produced based on ESP bar strip continuous casting and rolling flow paths according to the embodiment of the present invention
Schematic diagram.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific embodiment
In the following description, for purposes of illustration, it in order to provide the comprehensive understanding to one or more embodiments, explains
Many details are stated.It may be evident, however, that these embodiments can also be realized without these specific details.
The problem of this and environmental protection drop in needs is generated for the current steel of aforementioned proposition, the present invention proposes one kind and is based on
The method of the DP780 steel of ESP bar strip continuous casting and rolling flow paths production, using the manufacturing side of ESP technique productions DP780 steel
Method can directly be produced into various thickness specification strips from continuous casting, environmental protection and energy saving and can reduce cost.
Specific embodiments of the present invention are described in detail below with reference to attached drawing.
In order to illustrate the method provided by the invention based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, Fig. 1 shows
The method flow based on ESP bar strip continuous casting and rolling flow paths production DP780 steel according to embodiments of the present invention is gone out.
As shown in Figure 1, the method provided by the invention based on ESP bar strip continuous casting and rolling flow paths production DP780 steel includes：
S110：Raw material are selected, wherein, raw material include by mass percentage：0.06~0.20% C, 0.2~
0.6% Si, 1.2~2.0% Mn, 0.1~0.5% Cr ,≤0.3% Mo, 0.02~0.05% Nb ,≤
0.012% S ,≤0.015% P, 0.1%~0.5% Cu, remaining is ferro element；
S120：Raw material are subjected to converter smelting and LF stoves are smelted；
S130：Hot-strip of the molten steel to be formed by ESP producing lines generation different-thickness will be smelted from LF stoves, wherein,
In ESP producing lines, the temperature of roughing outlet is 800 DEG C~860 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C；
S140：Determine ratio needed for the ferrite and martensite in hot-strip successively by secondary cooling hot-strip；
Wherein,
After hot-strip first is cooled to 600 DEG C~750 DEG C, and 2~10s is kept the temperature, contain the ferrite in hot-strip
Amount reaches ratio needed for DP780 steel；
Then rapid cooling hot-rolled strip makes the martensite content in strip reach needed for DP780 steel to 150~350 DEG C
Ratio.
Above-mentioned steps are the specific method using ESP technique productions DP780 steel, in the present invention, are given birth to using ESP techniques
Production DP780 steel obtains a certain proportion of ferrite and martensite and ensures that steel mechanical property is crucial, it is therefore necessary to ensure
ESP production technologies are produced and using cooling controlling and rolling controlling process.
In step s 110, in the selection of the raw material of generation DP780 steel, in order to inhibit pearlite and obtain enough
Martensite, while consider cost problem ,≤0.3% Mo is added in raw material；In view of the intensity of the DP780 steel of generation
For the intensity of 780MPa, then 0.02~0.05% Nb is added in raw material；Requirement for product corrosive nature, in original
There is 0.1%~0.5% Cu in material.
In the composition design of raw material, the ratio of C is 0.06~0.20%, mainly forms DP780 steel requirements
Martensite and ensure DP780 steel intensity.In view of the performance of DP780 steel, such as weldability, it is desirable that C content 0.2% with
Under, if C too low (being less than 0.02%), is not readily available duplex structure.C is the important element for improving the strength of materials, and C's contains
Amount can ensure that the performance of DP780 steel reduces production cost simultaneously.
Ratios of the Si in raw material is 0.2~0.6%, and ferro element is formed in generating process.Si can expand α+γ
Area widens the temperature range that critical zone is handled, and improves the processing performance of two-phase DP780 steel, be conducive to keep two-phase hardness of steel,
The stability and reproducibility of the performances such as ductility.The form of austenite formed during the heating of critical zone can be changed by adding in Si, thus
The martensite of fine uniform distribution is easy to get, ensures that dual phase steel obtains and good strengthens the good of effect and intensity and ductility
Cooperation.Si or ferritic solution strengthening element, it accelerates segregation of the carbon to austenite, avoids gap solution strengthening and can keep away
Exempt from the generation of coarse carbide during cooling, improve the extension property of dual phase steel.In addition, Si can also improve the through hardening of dual phase steel
Property.
Ratio shared in raw material Mn has the function of solution strengthening for 1.0~2.0%, Mn, can expand γ areas, drops
Low γ → α phase transition temperatures, crystal grain thinning, and Mn can postpone perlitic transformation strongly, be conducive to bainite and formed, by reasonable
Control, can reduce Mn temperature to room temperature hereinafter, further improving remained austenite content, but it is excessively high may be such that grain coarsening, weaken
The resistance to corrosion of steel reduces welding performance.But if Mn contents increase, martensite quenching degree can be improved, is unfavorable for extending
Rate improves.
Ratio shared in raw material Cr is austenitic temperature element for 0.1~0.5%, Cr, particularly its medium temperature
It is more strong to spend range effect.Cr is middle carbide, it has stronger affinity with C atoms, can hinder C atoms
Diffusion, in addition Mn increase stability comprehensive function, significantly improve the quenching degree of steel, perlitic transformation can not only be postponed strongly
And bainite transformation, and expand coiling temperature section.Although Cr is weak solution strengthening element, but can increase austenite
Supercooling ability, so as to thinning microstructure, strengthened effect.In addition, Cr can promote carbon to be spread to austenite, and iron element can be reduced
The yield strength of body is more advantageous to obtaining the dual phase steel of low yield strength.
Ratio shared in raw material Mo is middle carbide for≤0.3%, Mo, is risen simultaneously in steel solid
Molten reinforcing and the effect of precipitation strength, and have desirable influence to the quenching degree of austenite.Mo can significantly improve metastable Ovshinsky
The stability of body inhibits ferrite and pearlite transformation so that CCT curves (Continuous Cooling
Transformation, overcooling austenite continuous coo1ing turn) high temperature ferrite and pearlite phase transformation significantly moves to right, is conducive to
Technological parameter is controlled in actual production.Adding in Mo can make steel grade be substantially reduced the sensibility for controlling cold technological parameter, it is easier to
Ferrito-martensite duplex structure is obtained by cooling controlling and rolling controlling process on hot tandem；And add in Mo can also improve it is anti-
Tensile strength reduces yield tensile ratio, and plasticity is kept to be basically unchanged.
Ratio shared in raw material Nb is 0.02~0.05%, Nb to C in crystal grain refinement, transformation behavior, austenite
Enrichment plays remarkable effect.Static and dynamic recrystallization and austenite are to ferrite in the Nb delay thermal deformation process of solid solution condition
Phase transformation, so as to expand the temperature range between dynamic recrystallization final temperature and Ac3, for Unhydrated cement rolling provide
It is convenient.Nb is combined with C and N to be formed tiny carbonitride and can also postpone to recrystallize, and ferrite crystal grain is prevented to grow up, so as to have
Strong refined crystalline strengthening effect and stronger precipitating reinforcing effect.
In the step s 120, converter is carried out according to the ingredient of above-mentioned (step S110), LF stoves are smelted.That is, molten iron
Refine to obtain the molten steel of ingredient needed for generation DP780 steel using LF stoves after converter smelting.Wherein, pneumatic steelmaking
(converter steelmaking) is using molten iron, steel scrap, ferroalloy as primary raw material, not by external energy, by iron liquid sheet
Chemical reaction generates heat and steelmaking process is completed in converter between the physical thermal of body and iron liquid component.Converter mainly for the production of
The smelting of carbon steel, steel alloy and copper and mickel.
LF (ladle furnace) stove, that is, ladle refining furnace is main external refining equipment in steel production.LF stoves
Refer generally to the refining furnace in steel industry, practical is exactly a kind of special shape of electric arc furnaces.
In step S130 and step S140, in ESP producing lines, the temperature that strand enters roughing entrance cannot be below 950
DEG C, the temperature of finish rolling roughing outlet is 800~860 DEG C, during intermediate base initially enters induction heater before entrance mm finishing mill unit,
IH (sensing heating outlet temperature is 1120~1180 DEG C, is come out from induction heater and enters mm finishing mill unit, and finish rolling outlet
Temperature is not less than 800 DEG C, also, in ESP producing lines, and according to actual demand, different parameters is set in generation equipment, from
And generate the middle carbon analysis of producing hot rolled TRIP of 1.5~6.0mm not equal thickness.
A certain proportion of ferrite and martensite are obtained by control cooling temperature after rolling, under normal circumstances DP780 steel
In ferrite and martensite ratio be 5:1, it can be done in practical applications according to the intensity of steel and the situation of elongation percentage suitable
When adjustment.
Ferrite and martensite of the hot-strip needed for by the DP780 steel of cooling generation twice, finally batch storage.Its
In, it is cooled to hot-strip for the first time and is cooled to 600 DEG C~750 DEG C, and 2 are kept the temperature within the temperature range of this cooling on layer cold line
~10s generates a certain proportion of ferrite；Then 150~350 DEG C are rapidly cooled to, generates a certain proportion of martensite, most
After batch storage.
Wherein, in ESP producing lines, the molten steel for smelting out from LF stoves enters conticaster, and the strand come out from conticaster is straight
It taps into and intermediate base (wherein, strand enters group inlet temperature of milling train group not less than 950 DEG C) is made into roughing mills, then pass through
Strand head wedge-shaped segment is segmented and is cut away by rocking shears, and then strand enters piler (effect of piler is ought be below
It, can be offline at this piler when equipment breaks down).Directly pass through during normal rolling, then intermediate base is cut off through flying shear
Tail enters mm finishing mill unit, from mm finishing mill unit come out generate hot-strip (wherein, from mm finishing mill unit come out temperature be not less than
800℃).From the hot-strip that mm finishing mill unit generates by cooling down ferrite and martensite needed for generation DP780 steel twice, lead to
It crosses runout table and batches storage through pinch roller feeding coiling machine.
According to the method for above-mentioned generation DP780 steel, the present invention is further described using examples below.
Embodiment 1
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 3.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 842 DEG C, and the temperature of finish rolling outlet is 812 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 250 DEG C
Example.
The specification of DP780 steel：3.0 × 1250mm, yield strength：512MPa, tensile strength：822MPa, elongation percentage：
19.5%.
Embodiment 2
Raw material are selected, wherein, raw material include by mass percentage：0.20% C, 0.2% Si, 1.2%
Mn, 0.1% Cr, 0.3% Mo, 0.03% Nb, 0.012% S, 0.015% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 5.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 842 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 600 DEG C, and 10s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel
Required ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel to 150 DEG C
Ratio.
The specification of DP780 steel：5.0 × 1250mm, yield strength：532MPa, tensile strength：722MPa, elongation percentage：
21.5%.
Embodiment 3
Raw material are selected, wherein, raw material include by mass percentage：0.10% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 2.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 800 DEG C, and the temperature of finish rolling outlet is 812 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in the hot-strip reach DP780 steel institute to 250 DEG C
Need ratio.
The specification of DP780 steel：2.5 × 1250mm, yield strength：576MPa, tensile strength：843MPa, elongation percentage：
23.5%.
Embodiment 4
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.6% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.21% Cu, remaining is iron
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 4.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 860 DEG C, and the temperature of finish rolling outlet is 820 DEG C；
After hot-strip is cooled to 750 DEG C, and 6s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 150 DEG C
Example.
The specification of DP780 steel：4.0 × 1250mm, yield strength：509MPa, tensile strength：793MPa, elongation percentage：
18.5%.
Embodiment 5
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 2.0%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.25% Cu, remaining is iron
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 6.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 950 DEG C, and the temperature of finish rolling outlet is 812 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 150 DEG C
Example.
The specification of DP780 steel：6.0 × 1250mm, yield strength：506MPa, tensile strength：789MPa, elongation percentage：
18.4%.
Embodiment 6
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 2.0%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.15% Cu, remaining is iron
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 3.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 834 DEG C, and the temperature of finish rolling outlet is 812 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 250 DEG C
Example.
The specification of DP780 steel：3.0 × 1250mm, yield strength：556MPa, tensile strength：833MPa, elongation percentage：
23%.
Embodiment 7
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 2.0%
Mn, 0.3% Cr, 0.1% Mo, 0.03% Nb, 0.008% S, 0.012% P, 0.3% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 1.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 800 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 680 DEG C, and 8s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 350 DEG C
Example.
The specification of DP780 steel：1.5 × 1250mm, yield strength：591MPa, tensile strength：843MPa, elongation percentage：
25%.
Embodiment 8
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.03% Nb, 0.0012% S, 0.015% P, 0.1% Cu, remaining is iron
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 2.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 842 DEG C, and the temperature of finish rolling outlet is 812 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 350 DEG C
Example.
The specification of DP780 steel：2.5 × 1250mm, yield strength：545MPa, tensile strength：842MPa, elongation percentage：
19.5%.
Embodiment 9
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 4.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing entrance is 950 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 680 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 250 DEG C
Example.
The specification of DP780 steel：4.5 × 1250mm, yield strength：512MPa, tensile strength：822MPa, elongation percentage：
19.5%.
Embodiment 10
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 3.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing entrance is 980 DEG C, and the temperature of finish rolling outlet is 850 DEG C；
After hot-strip is cooled to 680 DEG C, and 10s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel
Required ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel to 250 DEG C
Ratio.
The specification of DP780 steel：3.5 × 1250mm, yield strength：523MPa, tensile strength：806MPa, elongation percentage：
20%.
Embodiment 11
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 2.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 850 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 600 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 250 DEG C
Example.
The specification of DP780 steel：2.5.0 × 1250mm, yield strength：517MPa, tensile strength：807MPa, elongation percentage：
21%.
Embodiment 12
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 3.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 842 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 750 DEG C, and 10s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel
Required ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel to 250 DEG C
Ratio.
The specification of DP780 steel：3.0 × 1250mm, yield strength：566MPa, tensile strength：816MPa, elongation percentage：
22.3%.
Embodiment 13
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 4.5mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 860 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 600 DEG C, and 2s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 250 DEG C
Example.
The specification of DP780 steel：4.5 × 1250mm, yield strength：534MPa, tensile strength：807MPa, elongation percentage：
21%.
Embodiment 14
Raw material are selected, wherein, raw material include by mass percentage：0.06% C, 0.5% Si, 1.6%
Mn, 0.5% Cr, 0.1% Mo, 0.02% Nb, 0.008% S, 0.012% P, 0.2% Cu, remaining is iron member
Element；
Raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation 6.0mm thickness will be smelted from LF stoves, wherein, passing through
During ESP producing lines, the temperature of roughing outlet is 841 DEG C, and the temperature of finish rolling outlet is 800 DEG C；
After hot-strip is cooled to 600 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach DP780 steel institute
Need ratio；Then rapid cooling hot-rolled strip makes the martensite content in hot-strip reach needed for DP780 steel and compares to 350 DEG C
Example.
The specification of DP780 steel：6.0 × 1250mm, yield strength：509MPa, tensile strength：792MPa, elongation percentage：
25%.
It can be ignored it should be noted that floating of the DP780 steel of above-described embodiment generation on thickness is very small,
Yield strength and tensile strength have floating up and down for 30MPa, illustrate hereby in the present invention.
By the above embodiment as can be seen that provided by the invention produced based on ESP bar strip continuous casting and rolling flow paths
The method of DP780 steel by using ESP Process Production DP780 steel, directly generates various thickness specification strips, not only from continuous casting
Energy conservation and environmental protection but also it can reduce cost.
It is described in an illustrative manner above with reference to attached drawing according to proposed by the present invention based on ESP thin slab continuous casting and rolling streams
The method that journey produces DP780 steel.It will be understood by those skilled in the art, however, that for the invention described above proposed based on ESP
The method that bar strip continuous casting and rolling flow path produces DP780 steel, can also make various on the basis of the content of present invention is not departed from
It improves.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (6)
1. a kind of method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, including：
Raw material are selected, wherein, the raw material include by mass percentage：0.06~0.20% C, 0.2~0.6%
Si, 1.2~2.0% Mn, 0.1~0.5% Cr ,≤0.3% Mo, 0.02~0.05% Nb ,≤0.012% S ,≤
0.015% P, 0.1%~0.5% Cu, remaining is ferro element；
The raw material are subjected to converter smelting and LF stoves are smelted；
Hot-strip of the molten steel to be formed by ESP producing lines generation different-thickness will be smelted from the LF stoves, wherein, described
In ESP producing lines, the temperature of roughing outlet is 800~860 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C, sensing heating outlet
Temperature is 1120~1180 DEG C；
Determine ratio needed for the ferrite and martensite in the hot-strip successively by hot-strip described in secondary cooling；Its
In,
After the hot-strip first is cooled to 600~750 DEG C, and 2~10s is kept the temperature, make the ferrite in the hot-strip
Content reaches ratio needed for DP780 steel；
Then the hot-strip is cooled down rapidly to 150~350 DEG C, reaches the martensite content in the hot-strip
Ratio needed for DP780 steel.
2. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, wherein,
In the ESP producing lines, the temperature of roughing entrance is not less than 950 DEG C.
3. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, wherein,
Ratio needed for ferrite and martensite in the hot-strip is determined successively by hot-strip described in secondary cooling
During, the ratio 5 of the ferrite and the martensite:1.
4. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, wherein,
The thickness of the hot-strip is 1.5mm~6.0mm.
5. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, wherein,
During DP780 steel is generated, the C in the raw material forms the martensite needed for DP780 steel, to ensure
The intensity of DP780 steel.
6. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow paths production DP780 steel, wherein,
During DP780 steel is generated, the Si in the raw material forms the ferrite needed for DP780 steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610393922.2A CN106011618B (en) | 2016-06-06 | 2016-06-06 | Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610393922.2A CN106011618B (en) | 2016-06-06 | 2016-06-06 | Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106011618A CN106011618A (en) | 2016-10-12 |
| CN106011618B true CN106011618B (en) | 2018-07-03 |
Family
ID=57090617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610393922.2A Active CN106011618B (en) | 2016-06-06 | 2016-06-06 | Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106011618B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834886B (en) * | 2016-12-30 | 2018-11-27 | 日照宝华新材料有限公司 | Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel |
| CN106756508B (en) * | 2016-12-30 | 2018-11-06 | 日照钢铁控股集团有限公司 | The method for producing Thin Specs REH380LA steel based on ESP bar strip continuous casting and rolling flow paths |
| CN106801195B (en) * | 2016-12-30 | 2018-11-27 | 日照宝华新材料有限公司 | Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE75Cr1 steel |
| CN106834885B (en) * | 2016-12-30 | 2018-11-06 | 日照钢铁控股集团有限公司 | The method for producing Thin Specs Q345 Series Steels based on ESP bar strip continuous casting and rolling flow paths |
| CN107641699B (en) * | 2017-09-20 | 2019-06-18 | 武汉钢铁有限公司 | Method based on CSP process production thin gauge hot rolling DP780 steel |
| CN107739799A (en) * | 2017-09-30 | 2018-02-27 | 日照宝华新材料有限公司 | Based on the method that SPFH590 steel is produced completely without head sheet continuous casting and rolling |
| CN109055867B (en) * | 2018-08-30 | 2021-06-29 | 日照钢铁控股集团有限公司 | Method for producing high-hole-expansion hot-dip galvanized plate with tensile strength of 540MPa |
| CN110004362B (en) * | 2019-04-01 | 2021-06-18 | 山东钢铁集团日照有限公司 | Production method for improving yield ratio and hole expanding performance of cold-rolled DP780 steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793400A (en) * | 2005-12-27 | 2006-06-28 | 东北大学 | Strength of extension 750-795 MPa grade double-phase steel plate and mfg. method thereof |
| CN101906571A (en) * | 2010-06-24 | 2010-12-08 | 武汉钢铁(集团)公司 | CSP process-based manufacturing method of economical hot-rolled dual-phase steel with high surface quality |
| CN104593665A (en) * | 2015-02-03 | 2015-05-06 | 东北大学 | Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process |
| CN104838026A (en) * | 2012-12-11 | 2015-08-12 | 新日铁住金株式会社 | Hot-rolled steel sheet and production method therefor |
| JP2015214718A (en) * | 2014-05-08 | 2015-12-03 | 新日鐵住金株式会社 | Hot rolled steel sheet and production method therefor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3719007B2 (en) * | 1998-08-12 | 2005-11-24 | Ｊｆｅスチール株式会社 | Manufacturing method of hot-rolled steel strip with two-phase structure |
| WO2012067379A2 (en) * | 2010-11-15 | 2012-05-24 | (주)포스코 | Method for manufacturing high-strength cold-rolled/hot-rolled dp steel having a tensile strength grade of 590 mpa and excellent workability, as well as little deviation in the material properties thereof |
| KR101245701B1 (en) * | 2010-11-15 | 2013-04-01 | 주식회사 포스코 | METHOD FOR MANUFACTURING TENSILE STRENGTH 590MPa CLASS HOT ROLLED DP STEEL WITH EXCELLENT WORKABILITY AND VARIATION OF MECHANICAL PROPERTY |
-
2016
- 2016-06-06 CN CN201610393922.2A patent/CN106011618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793400A (en) * | 2005-12-27 | 2006-06-28 | 东北大学 | Strength of extension 750-795 MPa grade double-phase steel plate and mfg. method thereof |
| CN101906571A (en) * | 2010-06-24 | 2010-12-08 | 武汉钢铁(集团)公司 | CSP process-based manufacturing method of economical hot-rolled dual-phase steel with high surface quality |
| CN104838026A (en) * | 2012-12-11 | 2015-08-12 | 新日铁住金株式会社 | Hot-rolled steel sheet and production method therefor |
| JP2015214718A (en) * | 2014-05-08 | 2015-12-03 | 新日鐵住金株式会社 | Hot rolled steel sheet and production method therefor |
| CN104593665A (en) * | 2015-02-03 | 2015-05-06 | 东北大学 | Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106011618A (en) | 2016-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106011618B (en) | Method based on ESP bar strip continuous casting and rolling flow paths production DP780 steel | |
| CN106756508B (en) | The method for producing Thin Specs REH380LA steel based on ESP bar strip continuous casting and rolling flow paths | |
| CN106011421B (en) | Method based on ESP bar strip continuous casting and rolling flow path production thin gauge S500MC steel | |
| CN106191680B (en) | Method based on ESP bar strip continuous casting and rolling flow paths production DP600 steel | |
| CN106756560B (en) | The method for producing Thin Specs RE700L steel based on ESP bar strip continuous casting and rolling flow paths | |
| CN106834887B (en) | Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE510L steel | |
| CN106077090B (en) | The method for producing Thin Specs checkered steel plate based on ESP bar strip continuous casting and rolling flow paths | |
| CN106834924B (en) | The method for producing Thin Specs SAPH440 steel based on ESP bar strip continuous casting and rolling flow paths | |
| CN106191681B (en) | The ferritic method of mild steel is produced based on ESP bar strip continuous casting and rolling flow paths | |
| CN101376944B (en) | High-strength high-tensile ratio cold-rolled steel sheet and manufacturing method thereof | |
| CN100478479C (en) | Hot-rolled low-silicon multiphase steel and preparation method thereof | |
| CN106222561B (en) | Method based on ESP bar strip continuous casting and rolling flow paths production low-carbon fire-fighting equipment steel | |
| CN106367686B (en) | Method based on ESP bar strip continuous casting and rolling flow paths production weathering steel | |
| CN105177422B (en) | Ultra-long thin EH36 steel and production method of ultra-long thin EH36 steel on steckle mill | |
| CN106834886A (en) | The method that Thin Specs RE65Mn steel is produced based on ESP bar strip continuous casting and rolling flow paths | |
| CN103237906A (en) | Method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof | |
| CN106756511A (en) | A kind of bimetal saw blade backing D6A broad hot strips and its production method | |
| CN109055651A (en) | A method of 600MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP | |
| CN103249847A (en) | Method for manufacturing high-strength cold-rolled/hot-rolled trip steel having a tensile strength of 590 mpa grade, superior workability, and low mechanical-property deviation | |
| CN107604256A (en) | A kind of preparation method of 700MPa levels automotive frame steel band | |
| CN107723602A (en) | 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method | |
| CN102952998A (en) | 800MPa-grade hot-rolling transformation induced plasticity steel plate and its manufacturing method | |
| CN106756561B (en) | Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE52Mn steel | |
| CN106834885B (en) | The method for producing Thin Specs Q345 Series Steels based on ESP bar strip continuous casting and rolling flow paths | |
| CN106048176B (en) | Method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190308 Address after: 276806 600 Binhai Road, Arashiyama District, Rizhao City, Shandong. Patentee after: Rizhao Steel Holding Group Co., Ltd. Address before: 276806 West of Xiamen Road, Yuquan Road, South of Steel City Avenue and North of Chemical Avenue, Lanshan Town, Rizhao City, Shandong Province Patentee before: RIZHAO BAOHUA NEW MATERIAL CO., LTD. |
|
| TR01 | Transfer of patent right |