CN106048176A - Method for producing low-carbon hot-rolled TRIP steel based on ESP thin slab continuous casting and rolling process - Google Patents
Method for producing low-carbon hot-rolled TRIP steel based on ESP thin slab continuous casting and rolling process Download PDFInfo
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- CN106048176A CN106048176A CN201610402636.8A CN201610402636A CN106048176A CN 106048176 A CN106048176 A CN 106048176A CN 201610402636 A CN201610402636 A CN 201610402636A CN 106048176 A CN106048176 A CN 106048176A
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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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- Metal Rolling (AREA)
Abstract
The invention provides a method for producing low-carbon hot-rolled TRIP steel based on the ESP thin slab continuous casting and rolling process. The method comprises the steps that raw materials are selected and comprises, by mass, 0.06%-0.12% of C, 1.0%-2.0% of Si, 1.0%-2.0% of Mn, 0.05%-0.25% of Mo, 0-0.012% of S, 0-0.020% of P, 0-0.006% of N and the balance Fe; the raw materials are sequentially subjected to converter smelting and LF furnace smelting; molten steel formed through LF furnace smelting passes an ESP production line to be generated into hot rolled strip steel of different thicknesses; in the ESP production line, the temperature of a rough rolling outlet is not lower than 800-860 DEG C, and the temperature of a finish rolling outlet is not lower than 800 DEG C; and the required ratio of ferrite and the required ratio of bainite in the hot rolled strip steel are sequentially determined through secondary cooling of the hot rolled strip steel, and then the hot rolled strip steel enters a recoiling machine to be coiled and put in storage. By means of the method for producing the low-carbon hot-rolled TRIP steel based on the ESP thin slab continuous casting and rolling process, the problem that the thickness of the head and the thickness of the tail of the low-carbon hot-rolled TRIP steel are out of tolerance can be solved, and the environment-friendly energy-saving effect can be achieved.
Description
Technical field
The present invention relates to iron and steel technical field, more specifically, relate to a kind of raw based on ESP bar strip continuous casting and rolling flow path
The method producing low-carbon hot-rolling TRIP steel.
Background technology
In recent years, along with persistently dropping of iron and steel market, iron and steel is constantly in slight diarrhea or without profit state, forces iron and steel producer
Having to inquire into Jiang Benzhi road, high-strength steel is mainly used in engineering machinery, transportation and vehicle manufacturing industry.Thin Specs high-strength steel
Use, not only can make 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 the severeest, and ferrous materials realizes high intensity, light
Quantify and energy-saving and cost-reducing become in the urgent need to.
Therefore, make full use of ESP exploitation application new product and meet national general planning and sector planning, meet country's modulation
Wound relevant policies regulation, it is possible to meet technique modernization, equipment enlarging, production intensification, resource and energy circulationization, energy consumption
Minimize, economic benefit optimized high start developing goal, for advancing steel industry energy-saving and emission-reduction and technological progress, promote
Enterprise transformation upgrading, scientific and technical innovation and product restructuring, all have and be of great significance.
Wherein, ESP (Endless Strip Production, strip steel without a head produces) line, is newly-built for A Weidi new one
For sheet billet continuous casting and rolling production line, owing to its casting speed reaches as high as 7m/min, one is watered and time can produce a whole piece steel band,
Centre does not has any cutting head cutting tail, thus has Total continuity strip steel and produce, wall scroll continuous casting line i.e. can reach outstanding production capacity,
Large-scale production big band wide flat steel and quality strip steel, conversion cost from molten steel to hot rolled coil are low, production-line technique is arranged the most
The feature such as compact.
TRIP steel has excellent performance, has high intensity and deep drawing quality energy, and relative inexpensiveness, TRIP steel in the world
In oil exploitation and transport, boats and ships and auto industry, metallurgical, mine and engineering machinery etc. are applied in field.
The tradition TRIP steel capital uses hot rolling cold rolling, traditional and the sheet continuous casting and rolling technique with CSP as representative, the hottest
Roll TRIP steel, the overproof problem of thickness the most end to end can be there is, affect user and use, bring difficulty for " cold with the torrid zone ".
In sum, for energy-conserving and environment-protective and reduce cost, the present invention proposes based on ESP CSP stream
The method of the low-carbon hot-rolling TRIP steel that journey produces.
Summary of the invention
In view of the above problems, it is an object of the invention to provide one and produce low-carbon (LC) based on ESP bar strip continuous casting and rolling flow path
The method of analysis of producing hot rolled TRIP, to solve, low-carbon hot-rolling TRIP steel toe tail thickness is overproof and the problem of environmental protection and energy saving.
The present invention provides a kind of method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path, including:
Select raw material, wherein, raw material includes by mass percentage: 0.06～the Si of the C of 0.12%, 1.0～2.0%, 1.0～
The Mo of Mn, 0.05～0.25% of the 2.0% ,≤S of the 0.012% ,≤P of the 0.020% ,≤N of 0.006%, remaining is ferrum unit
Element；Raw material carries out converter smelting and LF stove successively smelt；Line generation is produced not through ESP by smelting the molten steel formed from LF stove
The hot-strip of stack pile, wherein, in ESP produces 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 the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip,
Warehouse-in is batched subsequently into coiling machine；Wherein, after first hot-strip being cooled to 700～780 DEG C, and it is incubated 2～10s, makes heat
Roll the ferrite content in strip steel and reach ratio needed for low-carbon hot-rolling TRIP steel, the rapidest cooling hot-rolled strip steel to 350～450
DEG C, make the bainite content in hot-strip reach ratio needed for low-carbon hot-rolling TRIP steel.
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 to produce in line at ESP, the temperature of roughing entrance is not less than 950 DEG C, senses heating exit
Temperature is 1080～1200 DEG C.
Furthermore it is preferred that scheme be to generate during low-carbon hot-rolling TRIP steel, the C in raw material is for improving low-carbon (LC)
The yield strength of analysis of producing hot rolled TRIP and the element of tensile strength.
Furthermore it is preferred that scheme be to generate during low-carbon hot-rolling TRIP steel, the Si in raw material forms low-carbon (LC) heat
Roll the ferrite needed for TRIP steel.
Furthermore it is preferred that scheme be to generate during low-carbon hot-rolling TRIP steel, the Mn in raw material generates low-carbon (LC) heat
Roll the bainite needed for TRIP.
Knowable to technical scheme above, what the present invention provided produces low-carbon (LC) heat based on ESP bar strip continuous casting and rolling flow path
The method rolling TRIP steel, by using ESP Process Production low-carbon hot-rolling TRIP steel, it is not necessary to cold rolling and annealing after continuous, it is possible to big
Amplitude ground reduces cost, shortens the production cycle, and energy-conserving and environment-protective；Common hot rolling can also be avoided to produce low-carbon hot-rolling simultaneously
The thickness and precision problem end to end of TRIP steel.
In order to realize above-mentioned and relevant purpose, one or more aspects of the present invention include will be explained in below and
The feature particularly pointed out in claim.Description below and accompanying drawing are described in detail some illustrative aspects of the present invention.
But, some modes in the various modes of the principle that only can use the present invention of these aspects instruction.Additionally, the present invention
It is intended to include all these aspect and their equivalent.
Accompanying drawing explanation
By with reference to below in conjunction with the explanation of accompanying drawing and the content of claims, and along with to the present invention more comprehensively
Understanding, other purpose of the present invention and result will be more apparent and should be readily appreciated that.In the accompanying drawings:
Fig. 1 be according to the embodiment of the present invention based on ESP bar strip continuous casting and rolling flow path produce low-carbon hot-rolling TRIP steel
Method flow schematic diagram.
The most identical label indicates similar or corresponding feature or function.
Detailed description of the invention
In the following description, for purposes of illustration, in order to provide the comprehensive understanding to one or more embodiments, explain
Many details are stated.It may be evident, however, that these embodiments can also be realized in the case of not having these details.
For also existing in the generation method of the most traditional TRIP steel of aforementioned proposition, thickness the most end to end is overproof
Problem, the present invention proposes a kind of method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path, uses
ESP technique produces the method for manufacturing of low-carbon hot-rolling TRIP steel can be directly produced into various thickness specification hot-rolled strip from continuous casting
Steel, can preferably avoid the overproof problem of thickness end to end and energy-conserving and environment-protective, and therefore the present invention can examine thin gauge strip, again can
Reach the maximized demand of profits of customers.
Below with reference to accompanying drawing, the specific embodiment of the present invention is described in detail.
In order to the side producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path that the present invention provides is described
Method, Fig. 1 shows the side producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path according to embodiments of the present invention
Method flow process.
As it is shown in figure 1, the side producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path that the present invention provides
Method includes:
S110: select raw material, wherein, raw material includes by mass percentage: 0.06～the C of 0.12%, 1.0～
The Mo of the Mn of Si, 1.0～2.0%, 0.05～0.25% of 2.0% ,≤the S of 0.012% ,≤the P of 0.020% ,≤0.006%
N, remaining is ferrum element；
S120: raw material is carried out successively converter smelting and LF stove is smelted；
S130: will from LF stove smelt formed molten steel through ESP produce line generate different-thickness hot-strip, wherein,
ESP produces in line, and 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, senses heating exit
Temperature is 1080～1200 DEG C, and the temperature of finish rolling outlet is not less than 800 DEG C；
S140: determine ratio needed for the ferrite in hot-strip and bainite successively by cooling twice hot-strip,
Warehouse-in is batched subsequently into coiling machine；Wherein,
After first hot-strip being cooled to 700 DEG C～780 DEG C, and it is incubated 2～10s, makes the ferrite in hot-strip contain
Amount reaches ratio needed for low-carbon hot-rolling TRIP steel；
The rapidest cooling hot-rolled strip steel, to 350～450 DEG C, makes the bainite content in hot-strip reach low-carbon hot-rolling
Ratio needed for TRIP steel.
Above-mentioned steps is to use the concrete grammar of ESP Process Production low-carbon hot-rolling TRIP steel, in the present invention, obtains required
The austenite of the ferrite of ratio, bainite and remnants, and guarantee that strip steel thickness precision and mechanical property are the keys of the present invention, because of
This is in the present invention, it is ensured that carry out generating and using cooling controlling and rolling controlling process in ESP produces line.
In step s 110, generate low-carbon hot-rolling TRIP steel raw material select in, the mass percent of C be 0.06～
0.12%, wherein, C is the important element improving the strength of materials, and the design of rational composition can ensure that low-carbon hot-rolling TRIP steel is good
Yield strength and the performance such as tensile strength, simultaneously and production cost can be reduced.
Si ratio in raw material is 1.0～2.0%, and Si is ferrite former, is generating low-carbon hot-rolling TRIP
During steel, Si generates the ferrite required for low-carbon hot-rolling TRIP steel, adds silicon as reducing agent and deoxidation in steelmaking process
Agent, makes C to austenite diffusion inside, when its isothermal in bainite transformation temperature interval, is changed into bainite, due to Si energy
Enough precipitations effectively suppressing carbide, can produce retained austenite body thin film, the precipitation meeting of bainite between bainite and ferrite
Part carbon is made to be enriched with to austenite, thus stable austenite further.
Ratio shared in raw material for Mn is 1.0～2.0%, has the effect of solution strengthening, can expand γ district, reduces
γ → α phase transition temperature, crystal grain thinning, Mn can strongly postpone perlitic transformation, beneficially bainite and be formed, by conservative control,
Ms temperature can be reduced to below room temperature, improve remained austenite content further, but too high make grain coarsening, weaken the anti-of steel
Corrosive power, reduces welding performance.And Mn content increases, and can improve martensite quenching degree, but be detrimental to elongation percentage.
In the step s 120, carry out converter according to the composition of above-mentioned (step S110), LF stove is smelted.It is to say, molten iron
Obtain the molten steel of required composition again through LF stove refine after converter smelting.Wherein, pneumatic steelmaking (converter
Steelmaking) it is with molten iron, steel scrap, ferroalloy as primary raw material, not by external energy, by the physical thermal of ferrum liquid itself
With chemical reaction produces heat and completes steelmaking process in converter between ferrum liquid component.Converter is mainly for the production of carbon steel, alloy
Steel and the smelting of copper and mickel.
LF stove (ladle furnace) i.e. ladle refining furnace, is external refining equipment main during iron and steel produces.LF stove one
As refer to the refining furnace in steel industry, actual is exactly a kind of specific form of electric arc furnace.
In step s 130, in ESP produces line, strand enters the temperature of roughing entrance and cannot be below 950 DEG C, and intermediate blank exists
Initially entering in induction heater before entering mm finishing mill unit, (sensing heating exit temperature is 1080～1200 DEG C to IH, adds from sensing
Hot stove out enters mm finishing mill unit, and the temperature of finish rolling outlet is not less than 800 DEG C, and, in ESP produces line, according to reality
Demand, sets different parameters on generation equipment, thus generates the hot-strip of 1.5～6.0mm not equal thickness.
Wherein it is desired to explanation, IH is sensing heating exit temperature, and induction heater is positioned at after rotating hub cuts, finish rolling
Position before machine, the effect of sensing heating is heating strip steel, it is ensured that final rolling temperature, it may also be said to be the temperature of regulation intermediate blank
Degree, depending on IH temperature is according to strip steel finish rolling requirement and consideration to strip steel surface quality, can cause final rolling temperature not less than a certain temperature
Close, then waste the energy higher than a certain temperature.
Wherein, in ESP produces line, the molten steel entrance conticaster smelting out from LF stove pours, from conticaster out
Strand be directly entered roughing mill and make intermediate blank (wherein, the inlet temperature of strand entrance group milling train group is not less than 950 DEG C), so
After through rocking shears, strand head wedge-shaped segment is carried out segmentation and cuts away, then strand enter piler (effect of piler is
When equipment breaks down below, can roll off the production line at this piler).Directly passing through during normal rolling, intermediate blank is through flying subsequently
Shear end to end, be heated to more than 1080 DEG C (1080～1200 DEG C, temperature is too high can increase power consumption) subsequently into induction heater,
Subsequently enter mm finishing mill unit, out generate hot-strip from mm finishing mill unit (wherein, from mm finishing mill unit temperature out for being not less than
800℃)。
In step S140, by controlling the chilling temperature a certain proportion of ferrite of acquisition and bainite after hot rolling, one
In the case of as, the ratio of the ferrite in low-carbon hot-rolling TRIP steel and bainite is 4:1, in actual applications can be according to steel
The situation of intensity and elongation percentage does suitable adjustment.During generating low-carbon hot-rolling TRIP steel, the Si in raw material is formed
Ferrite needed for low-carbon hot-rolling TRIP steel, C, Si, Mn, the Mo in raw material generates the bainite needed for low-carbon hot-rolling TRIP.
Hot-strip generates the ferrite needed for low-carbon hot-rolling TRIP steel and bainite through twice cooling, the most directly enters
Enter coiling machine and batch warehouse-in.Wherein, being cooled to hot-strip is cooled to 700 DEG C～780 DEG C for the first time, and this is cold on layer cold line
But it is incubated 2～10s within the temperature range of, generates a certain proportion of ferrite；Then it is rapidly cooled to 350～450 DEG C, generates one
The bainite of certainty ratio, sends into coiling machine by runout table through pinch roll and batches warehouse-in.
According to the method for above-mentioned generation low-carbon hot-rolling TRIP steel, the present invention uses examples below to make further
Bright.
Embodiment 1
Select raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 1.6mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 1.6 × 1250mm, yield strength: 503MPa, tensile strength: 748MPa, extend
Rate: 32%.
Embodiment 2
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.06%, the Si of 1.42%, 1.60%
Mn, the Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 2.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.0 × 1250mm, yield strength: 560MPa, tensile strength: 762MPa, extend
Rate: 28%.
Embodiment 3
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.12%, the Si of 1.42%, 1.60%
Mn, the Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 2.5mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1120 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.5 × 1250mm, yield strength: 545MPa, tensile strength: 724MPa, extend
Rate: 30%.
Embodiment 4
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.0%, 1.60%
Mn, the Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 2.8mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1080 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
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
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 2.0%, 1.60%
Mn, the Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 3.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1200 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 3.0 × 1250mm, yield strength: 500MPa, tensile strength: 706MPa, extend
Rate: 28%.
Embodiment 6
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 2.0%
Mn, the Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 3.5mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 800 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 780 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 3.5 × 1250mm, yield strength: 498MPa, tensile strength: 592MPa, extend
Rate: 31%.
Embodiment 7
Selecting raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.0%
Mn, the Mo of 0.10%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 4.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 4.0 × 1250mm, yield strength: 482MPa, tensile strength: 691MPa, extend
Rate: 29%.
Embodiment 8
Select raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.25%, the S of 0.012%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 4.5mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 700 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
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 includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.05%, the S of 0.003%, the P of 0.020%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 5.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 780 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 400 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
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 includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.006%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 5.5mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 700 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 350 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 5.5 × 1250mm, yield strength: 429MPa, tensile strength: 627MPa, extend
Rate: 32%.
Embodiment 11
Select raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 6.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1140 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 780 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 450 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 6.0 × 1250mm, yield strength: 411MPa, tensile strength: 602MPa, extend
Rate: 35%.
Embodiment 12
Select raw material, wherein, raw material includes by mass percentage: the C of 0.08%, the Si of 1.42%, 1.60%Mn,
The Mo of 0.05%, the S of 0.003%, the P of 0.017%, the N of 0.004%, remaining is ferrum element；
Raw material carries out converter smelting successively, LF stove is smelted；
The molten steel smelting formation from LF stove is produced line through ESP and generates the hot-strip of 2.0mm thickness, wherein, produce at ESP
In line, the temperature of roughing outlet is 842 DEG C, and sensing outlet temperature is 1080 DEG C, the temperature 810 DEG C of finish rolling outlet；
Ratio needed for the ferrite in hot-strip and bainite is determined successively by cooling twice hot-strip；Wherein,
After first hot-strip being cooled to 740 DEG C, and it is incubated 4s, makes the ferrite content in hot-strip reach low-carbon (LC) heat
Roll ratio needed for TRIP steel；
The rapidest cooling hot-rolled strip steel, to 450 DEG C, makes the martensite content in strip steel reach low-carbon hot-rolling TRIP steel institute
Need ratio.
The specification of low-carbon hot-rolling TRIP steel: 2.0 × 1250mm, yield strength: 575MPa, tensile strength: 766MPa, extend
Rate: 35%.
Can neglect it should be noted that the low-carbon hot-rolling TRIP steel floating on thickness that generates of above-described embodiment is the least
Slightly disregarding, yield strength and tensile strength all have fluctuating of 30MPa, the most hereby illustrate.
By above-mentioned embodiment it can be seen that the present invention provide based on ESP bar strip continuous casting and rolling flow path produce low
The method of carbon analysis of producing hot rolled TRIP, by using ESP Process Production low-carbon hot-rolling TRIP steel, it is not necessary to cold rolling and annealing, energy after continuous
Cost is enough greatly reduced, shortens the production cycle, and energy-conserving and environment-protective；Common hot rolling can also be avoided to produce low-carbon (LC) heat simultaneously
Roll the thickness and precision problem end to end of TRIP steel.
Describe in an illustrative manner above with reference to accompanying drawing according to the present invention propose based on ESP CSP stream
Journey produces the method for low-carbon hot-rolling TRIP steel.It will be understood by those skilled in the art, however, that the invention described above is proposed
The method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path, it is also possible to without departing from present invention
On the basis of make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (7)
1. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path, including:
Selecting raw material, wherein, described raw material includes by mass percentage: 0.06～the C of 0.12%, 1.0～2.0%
The Mo of the Mn of Si, 1.0～2.0%, 0.05～the 0.25% ,≤S of the 0.012% ,≤P of the 0.020% ,≤N of 0.006%, its
Remaining is ferrum element；
Described raw material is carried out successively converter smelting and LF stove is smelted；
The molten steel smelting formation from described LF stove is produced line through ESP and generates the hot-strip of different-thickness, wherein, described
ESP produces in line, and 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 the ferrite in described hot-strip and bainite is determined successively, so by hot-strip described in cooling twice
Rear entrance coiling machine batches warehouse-in；Wherein,
After first described hot-strip being cooled to 700～780 DEG C, and it is incubated 2～10s, makes the ferrite in described hot-strip
Content reaches ratio needed for described low-carbon hot-rolling TRIP steel；
Then the described hot-strip of cooling, to 350～450 DEG C, makes the bainite content in described hot-strip reach described rapidly
Ratio needed for low-carbon hot-rolling TRIP steel.
2. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
The thickness of described hot-strip is 1.5mm～6.0mm.
3. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
In described ESP produces line, the temperature of roughing entrance is not less than 950 DEG C, and sensing heating exit temperature is 1080～1200 DEG C.
4. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
Ratio needed for determined the ferrite in described hot-strip and bainite successively by hot-strip described in cooling twice
During, described ferrite and ratio 4:1 of described bainite.
5. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
During generating described low-carbon hot-rolling TRIP steel, the C in described raw material is for improving described low-carbon hot-rolling TRIP steel
Yield strength and the element of tensile strength.
6. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
Generating during described low-carbon hot-rolling TRIP steel, the Si in described raw material forms described low-carbon hot-rolling TRIP steel institute
The ferrite needed.
7. the method producing low-carbon hot-rolling TRIP steel based on ESP bar strip continuous casting and rolling flow path as claimed in claim 1, its
In,
During generating described low-carbon hot-rolling TRIP steel, C, Si, Mn, the Mo in described raw material generates described 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. |