CN106048176B - Method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel - Google Patents
Method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel Download PDFInfo
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- CN106048176B CN106048176B CN201610402636.8A CN201610402636A CN106048176B CN 106048176 B CN106048176 B CN 106048176B CN 201610402636 A CN201610402636 A CN 201610402636A CN 106048176 B CN106048176 B CN 106048176B
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- 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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel, it include: selection raw material, wherein, raw material include: 0.06~0.12% C, 1.0~2.0% Si, 1.0~2.0% Mn, 0.05~0.25% Mo ,≤0.012% S ,≤0.020% P ,≤0.006% N by mass percentage, remaining is ferro element；Raw material are subjected to successively converter smelting and LF furnace is smelted；The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation different-thickness from LF furnace, wherein in ESP producing line, the temperature of roughing outlet is not less than 800~860 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C；Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip, batches storage subsequently into coiling machine.The problem of being able to solve overproof low-carbon hot-rolling TRIP steel toe tail thickness and environmental protection and energy saving using the present invention.
Description
Technical field
The present invention relates to iron and steel technical fields, more specifically, are related to a kind of raw based on ESP bar strip continuous casting and rolling flow path
The method for producing low-carbon hot-rolling TRIP steel.
Background technique
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 the road Jiang Benzhi, high-strength steel is mainly used for engineering machinery, communications and transportation and vehicle manufacturing industry.Thin gauge high-strength steel
Use, can not only make to manufacture vehicle part, the enterprise of handling equipment reduces steel usage amount and production cost, drop simultaneously
Low user's oil consumption cost.Currently, world energy sources, resource and environmental protection problem are increasingly severe, and steel material is realized high-intensitive, light
Quantization and it is energy-saving become there is an urgent need to.
Therefore, it makes full use of ESP development and application new product to meet national overall planning and sector planning, meets national modulation
Relevant policies regulation is created, can satisfy technique modernization, equipment enlarging, production intensification, resource and energy circulationization, 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 AVM hereinafter enlightening it is newly-built 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 has the production of Total continuity strip without any cutting head cutting tail, single continuous casting line can reach outstanding production capacity,
With wide flat steel and quality strip steel, the conversion cost from molten steel to hot rolled coil, low, production-line technique is arranged the most greatly for large-scale production
The features such as compact.
TRIP steel, which has, to be had excellent performance, and has high-intensitive and deep drawing quality energy, and relative inexpensiveness, in the world TRIP steel
It is applied in oil exploitation and transport, ship and auto industry, the fields such as metallurgy, mine and engineering machinery.
Traditional steel capital TRIP uses cold rolling, traditional hot rolling and using CSP as the sheet continuous casting and rolling technique of representative, especially hot
TRIP steel is rolled, there can be the apparent overproof problem of thickness end to end, influences user's use, brings difficulty for " cold with the torrid zone ".
In conclusion for energy conservation and environmental protection and reducing cost, the invention proposes be based on ESP thin slab continuous casting and rolling stream
The method of the low-carbon hot-rolling TRIP steel of journey production.
Summary of the invention
In view of the above problems, the object of the present invention is to provide one kind produces low-carbon based on ESP bar strip continuous casting and rolling flow path
The method of analysis of producing hot rolled TRIP, to solve the problems, such as that low-carbon hot-rolling TRIP steel toe tail thickness is overproof and environmental protection and energy saving.
The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel, comprising:
Select raw material, wherein raw material include: by mass percentage 0.06~0.12% C, 1.0~2.0% Si, 1.0~
2.0% Mn, 0.05~0.25% Mo ,≤0.012% S ,≤0.020% P ,≤0.006% N, remaining is iron member
Element；Raw material are subjected to successively converter smelting and LF furnace is smelted；It is generated the molten steel to be formed is smelted from LF furnace not by ESP producing line
The hot-strip of stack pile, wherein in ESP producing line, the temperature of roughing outlet is not less than 800~860 DEG C, the temperature of finish rolling outlet
Degree is not less than 800 DEG C；Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip,
Storage is batched subsequently into coiling machine；Wherein, after hot-strip being first cooled to 700~780 DEG C, and 2~10s is kept the temperature, makes heat
Ratio needed for the ferrite content in strip reaches low-carbon hot-rolling TRIP steel is rolled, then rapid cooling hot-rolled strip to 350~450
DEG C, ratio needed for making the bainite content in hot-strip reach low-carbon hot-rolling TRIP steel.
Furthermore it is preferred that scheme be, hot-strip with a thickness of 1.5mm~6.0mm.
Furthermore it is preferred that scheme be that in ESP producing line, the temperature of roughing entrance is not less than 950 DEG C, induction heating outlet
Temperature is 1080~1200 DEG C.
Furthermore it is preferred that scheme be that during generating low-carbon hot-rolling TRIP steel, C in raw material is to improve low-carbon
The yield strength of analysis of producing hot rolled TRIP and the element of tensile strength.
Furthermore it is preferred that scheme be that during generating low-carbon hot-rolling TRIP steel, Si in raw material forms low-carbon heat
Ferrite needed for rolling TRIP steel.
Furthermore it is preferred that scheme be that during generating low-carbon hot-rolling TRIP steel, Mn in raw material generates low-carbon heat
Bainite needed for rolling TRIP.
It can be seen from the above technical scheme that provided by the invention based on ESP bar strip continuous casting and rolling flow path production low-carbon heat
The method for rolling TRIP steel does not need continuous rear cold rolling and annealing, Neng Gou great by using ESP Process Production low-carbon hot-rolling TRIP steel
Cost is reduced to amplitude, shortens the production cycle, and energy conservation and environmental protection；Common hot rolling production low-carbon hot-rolling can also be avoided simultaneously
The thickness and precision problem end to end of TRIP steel.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention include be particularly described below and
The feature particularly pointed out in claim.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.
However, these aspects indicate only usable some of the various ways in the principles of the present invention.In addition, of the invention
It is intended to include all such aspects and their equivalent.
Detailed description of the invention
By reference to the following description in conjunction with the accompanying drawings and the contents of the claims, and with to it is of the invention more comprehensively
Understand, other objects and results of the present invention will be more clearly understood and understood.In the accompanying drawings:
Fig. 1 is to produce low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path according to the embodiment of the present invention
Method flow 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.
For there is significantly thickness is overproof end to end in the generation method of current traditional TRIP steel of aforementioned proposition
Problem, the invention proposes a kind of methods based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel, use
The method for manufacturing of ESP technique production low-carbon hot-rolling TRIP steel can directly be produced into various thickness specification hot-rolled strips from continuous casting
Steel, can preferably avoid the problem that thickness is overproof end to end and energy conservation and environmental protection, thus the present invention can examine thin gauge strip and
Reach the maximized demand of profits of customers.
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to illustrate the side provided by the invention based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel
Method, Fig. 1 show the side according to an embodiment of the present invention based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel
Method process.
As shown in Figure 1, the side provided by the invention based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel
Method includes:
S110: selection raw material, wherein raw material include: by mass percentage 0.06~0.12% C, 1.0~
2.0% Si, 1.0~2.0% Mn, 0.05~0.25% Mo ,≤0.012% S ,≤0.020% P ,≤0.006%
N, remaining is ferro element；
Raw material: successively being carried out converter smelting by S120 and LF furnace is smelted；
S130: the molten steel to be formed will be smelted by the hot-strip of ESP producing line generation different-thickness from LF furnace, wherein
In ESP producing line, the temperature of roughing entrance is not less than 950 DEG C, and the temperature of roughing outlet is 800 DEG C~860 DEG C, induction heating outlet
Temperature is 1080~1200 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C；
S140: ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip,
Storage is batched subsequently into coiling machine；Wherein,
After hot-strip is first cooled to 700 DEG C~780 DEG C, and 2~10s is kept the temperature, contains the ferrite in hot-strip
Ratio needed for amount reaches low-carbon hot-rolling TRIP steel；
Then cooling hot-rolled strip makes the bainite content in hot-strip reach low-carbon hot-rolling to 350~450 DEG C rapidly
Ratio needed for TRIP steel.
Above-mentioned steps are the specific method using ESP Process Production low-carbon hot-rolling TRIP steel, in the present invention, needed for acquisition
The austenite of the ferrite of ratio, bainite and remnants, and ensure strip thickness precision and mechanical property be the key that it is of the invention, because
This guarantees to carry out generating in ESP producing line and using cooling controlling and rolling controlling process in the present invention.
In step s 110, in the raw material selection for generating low-carbon hot-rolling TRIP steel, the mass percent of C is 0.06~
0.12%, wherein C is the important element for improving the strength of materials, and reasonable ingredient, which designs, can guarantee that low-carbon hot-rolling TRIP steel is good
Yield strength and the performances such as tensile strength, while and can reduce production cost.
Ratio of the Si in raw material is that 1.0~2.0%, Si is ferrite former, is generating low-carbon hot-rolling TRIP
During steel, Si generates ferrite required for low-carbon hot-rolling TRIP steel, and in steelmaking process plus silicon is as reducing agent and deoxidation
Agent makes C to spreading inside austenite, when its isothermal in bainite transformation temperature section, is changed into bainite, due to Si energy
Enough precipitations for effectively inhibiting carbide, can generate retained austenite body thin film, the precipitation meeting of bainite between bainite and ferrite
It is enriched with part carbon to austenite, thus further stable austenite.
Ratio Mn shared in raw material is 1.0~2.0%, has the function of solution strengthening, can expand the area γ, is reduced
γ → α phase transition temperature refines crystal grain, and Mn can postpone perlitic transformation strongly, be conducive to bainite and be formed, by rationally controlling,
Ms temperature can be reduced to room temperature hereinafter, further increasing remained austenite content, but it is excessively high may make grain coarsening, weaken the anti-of steel
Corrosive power reduces welding performance.And Mn content increases, and martensite harden ability can be improved, but be detrimental to elongation percentage.
In the step s 120, converter is carried out according to the ingredient of above-mentioned (step S110), LF furnace is smelted.That is, molten iron
It refines to obtain the molten steel of required ingredient using LF furnace after converter smelting.Wherein, pneumatic steelmaking (converter
It steelmaking is) using molten iron, steel scrap, ferroalloy as primary raw material, not by external energy, by the physical thermal of iron liquid itself
Chemical reaction generates heat and completes steelmaking process in converter between iron liquid component.Converter is mainly for the production of carbon steel, alloy
The smelting of steel and copper and mickel.
LF furnace (ladle furnace) i.e. ladle refining furnace is main external refining equipment in steel production.LF furnace one
As refer to refining furnace in steel industry, practical is exactly a kind of special shape of electric arc furnaces.
In step s 130, in ESP producing line, the temperature that slab enters roughing entrance cannot be below 950 DEG C, and intermediate base exists
It is initially entered in induction heater before into mm finishing mill unit, (induction heating outlet temperature is 1080~1200 DEG C to IH, is added from induction
Hot stove, which comes out, enters mm finishing mill unit, and the temperature of finish rolling outlet is not less than 800 DEG C, also, in ESP producing line, according to reality
Demand sets different parameters in generating device, to generate the hot-strip of 1.5~6.0mm not equal thickness.
Wherein, it should be noted that IH is induction heating outlet temperature, and induction heater is located at after rotating hub cuts, finish rolling
Position before machine, the effect of induction heating are heating strips, guarantee final rolling temperature, it may also be said to be the temperature for adjusting intermediate base
Degree, depending on IH temperature is according to strip finish rolling requirement and consideration to strip steel surface quality, will cause final rolling temperature not lower than a certain temperature
It closes, is higher than a certain temperature then waste of energy.
Wherein, in ESP producing line, the molten steel for smelting out from LF furnace enters conticaster and is poured, and comes out from conticaster
Slab be directly entered roughing mill intermediate base (wherein, slab enters group inlet temperature of milling train group not less than 950 DEG C) be made, so
Afterwards by rocking shears, slab head wedge-shaped segment is segmented and is cut away, then slab enters piler (effect of piler is
It, can be offline at this piler when equipment breaks down below).Directly pass through when normal rolling, then intermediate base is through flying
Shearing end to end, is heated to 1080 DEG C (1080~1200 DEG C, temperature is excessively high to will increase energy consumption) or more subsequently into induction heater,
Subsequently enter 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℃)。
In step S140, a certain proportion of ferrite and bainite are obtained by controlling cooling temperature after hot rolling, one
As in the case of the ratio of ferrite and bainite in low-carbon hot-rolling TRIP steel be 4:1, in practical applications can be according to steel
The case where intensity and elongation percentage, does adjustment appropriate.During generating low-carbon hot-rolling TRIP steel, the Si in raw material is formed
Ferrite needed for low-carbon hot-rolling TRIP steel, bainite needed for C, Si, Mn, Mo in raw material generate low-carbon hot-rolling TRIP.
Hot-strip by it is cooling twice generate low-carbon hot-rolling TRIP steel needed for ferrite and bainite, then directly into
Enter coiling machine and batches storage.Wherein, it is cooled to hot-strip for the first time and is cooled to 700 DEG C~780 DEG C, and this is cold on layer cold line
But 2~10s is kept the temperature within the temperature range of, generates a certain proportion of ferrite；Then 350~450 DEG C are rapidly cooled to, generates one
The bainite of certainty ratio is sent into coiling machine through pinch roller by runout table and batches storage.
According to the method for above-mentioned generation low-carbon hot-rolling TRIP steel, the present invention is made further using following embodiment
It is bright.
Embodiment 1
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 1.6mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 1.6 × 1250mm, yield strength: 503MPa, tensile strength: 748MPa extends
Rate: 32%.
Embodiment 2
Select raw material, wherein raw material include: 0.06% C, 1.42% Si, 1.60% by mass percentage
Mn, 0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 2.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.0 × 1250mm, yield strength: 560MPa, tensile strength: 762MPa extends
Rate: 28%.
Embodiment 3
Select raw material, wherein raw material include: 0.12% C, 1.42% Si, 1.60% by mass percentage
Mn, 0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 2.5mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1120 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.5 × 1250mm, yield strength: 545MPa, tensile strength: 724MPa extends
Rate: 30%.
Embodiment 4
Select raw material, wherein raw material include: 0.08% C, 1.0% Si, 1.60% by mass percentage
Mn, 0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 2.8mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1080 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: thickness: 2.8 × 1250mm, yield strength: 526MPa, tensile strength:
711MPa, elongation percentage: 32%.
Embodiment 5
Select raw material, wherein raw material include: 0.08% C, 2.0% Si, 1.60% by mass percentage
Mn, 0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 3.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1200 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 3.0 × 1250mm, yield strength: 500MPa, tensile strength: 706MPa extends
Rate: 28%.
Embodiment 6
Select raw material, wherein raw material include: 0.08% C, 1.42% Si, 2.0% by mass percentage
Mn, 0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 3.5mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 800 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 780 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 3.5 × 1250mm, yield strength: 498MPa, tensile strength: 592MPa extends
Rate: 31%.
Embodiment 7
Select raw material, wherein raw material include: 0.08% C, 1.42% Si, 1.0% by mass percentage
Mn, 0.10% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 4.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 4.0 × 1250mm, yield strength: 482MPa, tensile strength: 691MPa extends
Rate: 29%.
Embodiment 8
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.25% Mo, 0.012% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 4.5mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 700 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: thickness: 4.5 × 1250mm, yield strength: 476MPa, tensile strength:
684MPa, elongation percentage: 27%.
Embodiment 9
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.05% Mo, 0.003% S, 0.020% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 5.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 780 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 400 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: thickness: 5.0 × 1250mm, yield strength: 450MPa, tensile strength:
652MPa, elongation percentage: 29%.
Embodiment 10
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.05% Mo, 0.003% S, 0.017% P, 0.006% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 5.5mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 700 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 350 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 5.5 × 1250mm, yield strength: 429MPa, tensile strength: 627MPa extends
Rate: 32%.
Embodiment 11
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 6.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1140 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 780 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 450 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 6.0 × 1250mm, yield strength: 411MPa, tensile strength: 602MPa extends
Rate: 35%.
Embodiment 12
Select raw material, wherein raw material include: by mass percentage 0.08% C, 1.42% Si, 1.60%Mn,
0.05% Mo, 0.003% S, 0.017% P, 0.004% N, remaining is ferro element；
Raw material are successively carried out to converter smelting, LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation 2.0mm thickness from LF furnace, wherein produce in ESP
In line, the temperature of roughing outlet is 842 DEG C, and induction outlet temperature is 1080 DEG C, 810 DEG C of temperature of finish rolling outlet；
Ratio needed for successively determining the ferrite and bainite in hot-strip by secondary cooling hot-strip；Wherein,
After hot-strip is first cooled to 740 DEG C, and 4s is kept the temperature, the ferrite content in hot-strip is made to reach low-carbon heat
Ratio needed for rolling TRIP steel；
Then cooling hot-rolled strip makes the martensite content in strip reach low-carbon hot-rolling TRIP steel institute to 450 DEG C rapidly
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.0 × 1250mm, yield strength: 575MPa, tensile strength: 766MPa extends
Rate: 35%.
It should be noted that floating of the low-carbon hot-rolling TRIP steel of above-described embodiment generation on thickness is very small to neglect
Slightly disregard, yield strength and tensile strength have floating up and down for 30MPa, illustrate hereby in the present invention.
It is by above embodiment as can be seen that provided by the invention low based on the production of ESP bar strip continuous casting and rolling flow path
The method of carbon analysis of producing hot rolled TRIP does not need continuous rear cold rolling and annealing, energy by using ESP Process Production low-carbon hot-rolling TRIP steel
Cost is enough greatly reduced, shortens the production cycle, and energy conservation and environmental protection；Common hot rolling production low-carbon heat can also be avoided simultaneously
Roll the thickness and precision problem end to end of TRIP steel.
Described in an illustrative manner above with reference to attached drawing propose according to the present invention based on ESP thin slab continuous casting and rolling stream
The method of journey production low-carbon hot-rolling TRIP steel.It will be understood by those skilled in the art, however, that aforementioned present invention is proposed
Based on the method for ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel, the content of present invention can also not departed from
On the basis of make various improvement.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (5)
1. a kind of method based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel, comprising:
Select raw material, wherein the raw material include: by mass percentage 0.06~0.08% C, 1.0~2.0%
Si, 1.0~2.0% Mn, 0.05~0.25% Mo ,≤0.012% S ,≤0.020% P ,≤0.006% N,
Remaining is ferro element；
The raw material are successively carried out to converter smelting and LF furnace is smelted；
The molten steel to be formed will be smelted by the hot-strip of ESP producing line generation different-thickness from the LF furnace, wherein described
In ESP producing line, the temperature of roughing entrance is not less than 950 DEG C, and the temperature of roughing outlet is 800~860 DEG C, the temperature of finish rolling outlet
Not less than 800 DEG C, induction heating outlet temperature is 1080~1200 DEG C；Wherein, the hot-strip with a thickness of 1.5mm~
6.0mm；
Ratio needed for successively determining ferrite and bainite in the hot-strip by hot-strip described in secondary cooling, so
Enter coiling machine afterwards and batches storage；Wherein,
After the hot-strip is first cooled to 700~780 DEG C, and 2~10s is kept the temperature, makes the ferrite in the hot-strip
Ratio needed for content reaches the low-carbon hot-rolling TRIP steel；
Then the hot-strip is cooled down rapidly to 350~450 DEG C, and the bainite content in the hot-strip is made to reach described
Ratio needed for low-carbon hot-rolling TRIP steel.
2. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel,
In,
The ratio needed for successively determining ferrite and bainite in the hot-strip by hot-strip described in secondary cooling
During, the ratio 4:1 of the ferrite and the bainite.
3. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel,
In,
During generating the low-carbon hot-rolling TRIP steel, the C in the raw material is to improve the low-carbon hot-rolling TRIP steel
Yield strength and tensile strength element.
4. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel,
In,
During generating the low-carbon hot-rolling TRIP steel, the Si in the raw material forms low-carbon hot-rolling TRIP steel institute
The ferrite needed.
5. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production low-carbon hot-rolling TRIP steel,
In,
During generating the low-carbon hot-rolling TRIP steel, C, Si, Mn, Mo in the raw material generate the low-carbon hot-rolling
Bainite needed for TRIP.
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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. |