CN106834886B - Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel - Google Patents

Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel Download PDF

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Publication number
CN106834886B
CN106834886B CN201611261696.9A CN201611261696A CN106834886B CN 106834886 B CN106834886 B CN 106834886B CN 201611261696 A CN201611261696 A CN 201611261696A CN 106834886 B CN106834886 B CN 106834886B
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steel
strip
esp
continuous casting
rolling
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CN106834886A (en
Inventor
秦哲
谢国海
刘宏志
朱经涛
王刚
狄丽华
严进宝
罗继锋
孙庆
郑万任
于长江
喻尧
谢基表
杜希恩
王学伦
秦建亮
安守勇
孙庆强
郑旭涛
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Rizhao Steel Holding Group Co Ltd
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Rizhao Baohua New Material Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel, including:Raw material are selected, raw material include by mass percentage:0.64~0.66% C, 0.19~0.28% Si, 0.90~0.97% Mn, 0.16~0.18% Cr ,≤0.0040% S ,≤0.0012% P ,≤0.10% Ni ,≤0.10% Cu;Raw material are successively carried out to converter smelting, the refining of LF furnace;The molten steel to be formed will be refined by the hot-strip of ESP producing line generation different-thickness from LF furnace;Wherein, in ESP producing line, roughing outlet temperature is 920~980 DEG C, and the temperature of finish rolling outlet is 810~870 DEG C;Hot-strip is cooled to 640~740 DEG C using section cooling air-cooled mode, batches the outbound after coiled strip steel slow cooling for coiled strip steel subsequently into coiling machine.Using the present invention, production process is solved there are the stability of ladle chemistry poor, slab element segregation serious, surface of steel plate decarburization layer depth, board dimension low precision, stability difference etc. and the problems such as tradition hot rolling is at high cost, energy consumption is high.

Description

Method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel
Technical field
The present invention relates to metal material processings and field shaping technique, more specifically, are related to a kind of based on ESP sheet billet The method of continuous casting and rolling flow production thin gauge RE65Mn 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, and the country at present further strengthens the attention degree of environmental protection, environmental requirement is again unprecedented stringent, because This inquires into drop originally and the process for producing steel and iron of environmental protection has become the road of very necessary existence.
Medium high carbon Fine Steel Casting iron, carbon tool steel, spring steel, structural alloy steel and alloy tool steel, have been widely used In fields such as automobile manufacture, engineering machinery, special equipment, high-end saw blade and special implements.With every profession and trade production technology Development, the high speed of enlargement and the sawing operation of saw blade specification, the obdurability and impact resistance of material seem more heavy It wants.65Mn steel is the main material that Now Domestic produces all kinds of saw blades, at low cost, specification is wide, easy heat treatment, performance stabilization The advantages that, saw blade production field still has irreplaceable status at home so far.The steel grade category Fine Steel Casting iron, can both do At single hardness saw blade, double hardness saw blades, after heat treatment available good comprehensive mechanical performance also can be made.
65Mn steel production technology is mainly with traditional heavy slab hot continuous rolling production technology both at home and abroad at present, and there are steel for production process The stability of Hydrochemical Composition is poor, slab element segregation is serious, surface of steel plate decarburization layer depth, board dimension low precision, performance are steady It is qualitative difference the disadvantages of, these problems directly affect the quality problem of process heat treatment process after steel plate, cause steel plate annealing or Steel plate annealing nodularization is incomplete or the problems such as quenching hardness is uneven after modifier treatment.
Thin gauge is produced based on ESP bar strip continuous casting and rolling flow path in view of the above-mentioned problems, the invention proposes one kind The method of RE65Mn steel.
Summary of the invention
In view of the above problems, the object of the present invention is to provide one kind produces thin rule based on ESP bar strip continuous casting and rolling flow path The method of lattice RE65Mn steel, that there are the stability of ladle chemistry to solve Conventional process is poor, slab element segregation is tight Weight, surface of steel plate decarburization layer depth, board dimension low precision, stability difference etc. and traditional hot rolling are at high cost, energy consumption is high Problem.
The present invention provides a kind of method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel, including:
Select raw material, wherein raw material include by mass percentage:0.64~0.66% C, 0.19~0.28% Si, 0.90~0.97% Mn, 0.16~0.18% Cr ,≤0.0040% S ,≤0.0012% P ,≤0.10% Ni ,≤0.10% Cu, remaining is ferro element;
Raw material are successively carried out to converter smelting, the refining of LF furnace;
The molten steel to be formed will be refined by the hot-strip of ESP producing line generation different-thickness from LF furnace;Wherein, it is produced in ESP In line, roughing outlet temperature is 920~980 DEG C, and the temperature of finish rolling outlet is 810~870 DEG C;
Using the cooling hot-rolled strip of the air-cooled mode of section cooling, 640~740 DEG C are cooled to, is batched subsequently into coiling machine For coiled strip steel, outbound after coiled strip steel slow cooling.
Furthermore it is preferred that scheme be, in ESP producing line, 3.5~6.0m/min of pulling speed of continuous casting, slab thickness 90~ 110mm。
Furthermore it is preferred that scheme be, in ESP producing line, roughing inlet temperature be >=950 DEG C, induction heating outlet temperature Degree is 1100~1180 DEG C.
Furthermore it is preferred that scheme be, hot-strip with a thickness of 1.5~3.5mm.
It can be seen from the above technical scheme that provided by the invention produce thin gauge based on ESP bar strip continuous casting and rolling flow path The method of RE65Mn steel, slab is not required to soaking stove heating Direct Rolling under high pulling rate, and the technological process of production is short, and it is green to belong to low energy consumption Color manufacturing process scope, the hot-rolled product skin decarburization mild degree produced, properties of product are stable, dimensional tolerance is small, hot rolling State can reach 1.5mm Ultra-thin band, can reduce cold rolling process rolling pass, reach the mesh energy-saving " with Bao Daihou " 's.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention includes the spy being particularly described below Sign.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.However, these aspect instructions are only It is that some of the various ways in the principles of the present invention can be used.In addition, the present invention is intended to include all such aspects with And their equivalent.
Detailed description of the invention
By reference to the content of the explanation below in conjunction with attached drawing, and with a more complete understanding of the present invention, the present invention Other purposes and result will be more clearly understood and understood.In the accompanying drawings:
Fig. 1 is to produce thin gauge RE65Mn 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 aforementioned proposition traditional hot rolling cost high energy consumption it is big the problems such as, the invention proposes one kind be based on ESP thin plate Continuous-casting tandem-rolling process produce thin gauge RE65Mn steel method, using this method can it is low production RE65Mn steel saw blade cost, Meet the requirement that properties of product are stable, dimensional tolerance is small, service life is high.
Wherein, ESP (Endless Strip Production, strip production without a head) producing line is newly-built new of AVM hereinafter enlightening Generation sheet billet continuous casting and rolling production line, a whole steel band can be produced by casting since it is primary, the no any cutting head cutting tail in centre, Thus has the advantages that the production of Total continuity strip, single continuous casting line has outstanding production capacity, large-scale production band broadband greatly The features such as steel and quality strip steel, the conversion cost from molten steel to hot rolled coil are low, production-line technique arrangement is the compactest.
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 thin gauge RE65Mn 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 thin gauge RE65Mn 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 thin gauge RE65Mn steel Method includes:
S110:Select raw material, wherein raw material include by mass percentage:0.64~0.66% C, 0.19~ 0.28% Si, 0.90~0.97% Mn, 0.16~0.18% Cr ,≤0.0040% S ,≤0.0012% P ,≤ 0.10% Ni ,≤0.10% Cu, remaining is ferro element;
S120:Raw material are successively carried out to converter smelting, the refining of LF furnace;
S130:The molten steel to be formed will be refined by the hot-strip of ESP producing line generation different-thickness from LF furnace;Wherein, exist In ESP producing line, roughing outlet temperature is 920~980 DEG C, and the temperature of finish rolling outlet is 810~870 DEG C;
S140:Hot-strip is cooling using the air-cooled mode of section cooling, 640~740 DEG C is cooled to, subsequently into coiling machine It batches, outbound after coiled strip steel slow cooling.
Above-mentioned steps are the specific method using ESP Process Production RE65Mn steel, and the present invention produces thin gauge RE65Mn steel Method specifically include smelting procedure, completely without head ESP thin slab continuous casting and rolling process, cooling process, coiling process, i.e.,:Mixed iron Furnace → molten iron pretreatment → BOF (converter smelting) → LF → ESP continuous casting and rolling → batches → slow cooling → finished product.
In step S110 of the invention, in the raw material selection for generating low RE65Mn steel, content of the C in raw material For:0.64~0.66%, C element is the main element for guaranteeing the strength of materials, hardness and wearability, and medium and high carbon steel requires to have Higher intensity and fatigue limit, typically by being used in the state of quenching+average tempering, to obtain higher elasticity The limit and toughness.For the intensity for guaranteeing steel, enough carbon must be contained in medium and high carbon steel, to guarantee the yield strength, anti-of material The indices such as tensile strength, hardness can meet the requirements.Carbon can be dissolved in steel and form solid solution, play solution strengthening Effect, is the main intensified element in steel.It can be played together with carbide in conjunction with when forming Carbide Precipitation The effect of precipitation strength, carbon be to the intensity contribution of steel maximum element, and influence steel elasticity attenuation resistance it is maximum Element.Therefore C content control in the present invention is in C:0.64%~0.66%.
Content of the Si in raw material be:Other than it can improve the intensity of steel, Si can improve horse by 0.19~0.28%, Si The stability of retained austenite between family name's body lath, while the temperature range that the Low-Temperature Temper Brittleness for also improving steel occurs, it is very heavy What is wanted is that silicon can prevent Carbon diffusion, delays the precipitation and accumulation of cementite, improves the stability of martensite, therefore can be effective The anti-temper softening ability for improving steel is tempered developed steel at a higher temperature, and it is suitable to be conducive to raising Heat-Treatment of Steel It should be able to power.Therefore Si content control in the present invention is 0.19%~0.28%.
Content of the Mn in raw material be:The maximum effect of 0.90~0.97%, Mn are the harden ability of raising steel, while It is important solution strengthening element.Manganese is carbide former, can also be existed with solid solution condition, also has refinement pearlite group The effect knitted, thus the intensity and hardness of ferrite austenite can be improved.Mn also has one to the anti-temper softening ability for improving steel Fixed effect, but when Mn content is higher, has the tendency that coarsened grain and increases temper brittleness, brings difficulty to processing.Therefore in this hair Bright middle Mn content control is 0.90%~0.97%.
Content of the Cr in raw material be:0.16%~0.18%, Cr element can reduce the activity of carbon in steel, and be strong carbon Compound formation element, chromium are to significantly improve the harden ability of steel, and the effect shared with manganese can be more preferable, can mitigate the decarburization of steel Tendency, improves the activation energy of carbon spread in steel.Therefore Cr content control in the present invention is 0.16%~0.18%.
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.
In step s 130, in ESP producing line, the temperature that slab enters roughing entrance is >=950 DEG C, and intermediate base is entering It is initially entered in induction heater before mm finishing mill unit, (induction heating outlet temperature is 1100~1180 DEG C to IH, from induction heater Enter mm finishing mill unit out, and the temperature of finish rolling outlet is not less than 810 DEG C, also, in ESP producing line, according to actual needs, Different parameters is set in generating device, to generate the RE65Mn steel of 1.5~3.5mm not equal thickness.
In an embodiment of the present invention, at anti-between the thickness and its yield strength, tensile strength of the RE65Mn steel of generation Than if the thickness of the RE65Mn steel generated is big, yield strength and tensile strength can reduce, if what is generated is low The thickness of RE65Mn steel is small, then its yield strength and tensile strength will increase.
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 RH furnace enters conticaster, with the pulling rate of 3.5~5.5m/min It casts, the slab come out from conticaster is directly entered 3 frame roughing mills and intermediate base is made, and then passes through rocking shears, by slab Head wedge-shaped segment is segmented and is cut away, then slab enter piler (effect of piler be ought below equipment break down When, can be offline at this piler).Directly pass through when normal rolling, then intermediate base is through rotary hub type flying shear crop end, then 1100~1180 DEG C are heated into induction heater, subsequently enters mm finishing mill unit, is come out from mm finishing mill unit and generates hot-strip. The hot-strip generated from mm finishing mill unit batches storage after section cooling.
In short, ESP produces RE65Mn Thin Strip Steel completely without head continuous casting and rolling technique of sheet bar, Molten Steel Cleanliness is high, at sub-control System is stablized, and casting blank solidification speed is fast, as-cast structure is more uniform, Segregation of Chemical Composition is small, and slab is realized straight without soaking stove heating Casting is connect, slab is low in operation of rolling temperature, and rolling time is short, and reduction in pass is big, helps to reduce plate surface decarburization, thin Change pearlite piece interlamellar spacing, can obviously eliminate component segregation, skin decarburization, tissue existing for traditional process production high-carbon strip The problems such as performance is unstable.ESP thickness of strand 90mm~110mm, ESP do not need threading completely without head casting and rolling process, heat It is uniform to roll the elongated thickness of volume, dimensional accuracy height, performance is stablized, and the service life for improving saw blade product is conducive to, and hot rolling product is thick Metric lattice reduce subsequent cold rolling process rolling pass up to 1.5mm, reduce cold rolling process production cost.
The present invention produces hot rolling thin gauge RE65Mn steel completely without head bar strip continuous casting and rolling flow path using ESP, can stablize and roll System production 1.5mm~3.5mm thin gauge hot-rolling high-strength steel, the elongated thickness of hot rolled coil is uniform, and performance is stablized, and metallographic structure is Soxhlet Body, pearlite, ferrite.Very thin hot-rolled band is able to produce using this technique, subsequent cold rolling process rolling pass can be reduced, reached To the purpose energy-saving " with Bao Daihou ", there are very high economic results in society, slab without soaking stove heating Direct Rolling, The technological process of production is short, energy saving, reduces CO2 emission, belongs to low energy consumption green steel and iron manufacturing process regime.
According to the method for above-mentioned generation RE65Mn steel, the present invention is further described according to following embodiment.
Embodiment 1
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.64%, Si:0.22Wt%, Mn:0.92Wt%, Cr:0.018Wt%, P:0.010Wt%, S:0.0020Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 22 DEG C of the tundish degree of superheat, pulling rate 4.9m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 970 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1170 DEG C;
Base among sensed heating is rolled into 1.5mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 850 DEG C;
Steel band is air-cooled to 720 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 1:
Table 1
Embodiment 2
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.65%, Si:0.25Wt%, Mn:0.93Wt%, Cr:0.017Wt%, P:0.011Wt%, S:0.0015Wt%, Cu: 0.0060Wt%, Ni:0.0050Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 20 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 970 DEG C of roughing inlet temperature, 940 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1180 DEG C;
Base among sensed heating is rolled into 1.6mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 850 DEG C;
Steel band is air-cooled to 710 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 2:
Table 2
Embodiment 3
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.66%, Si:0.23Wt%, Mn:0.94Wt%, Cr:0.017Wt%, P:0.009Wt%, S:0.0022Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 19 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 960 DEG C of roughing inlet temperature, 930 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1160 DEG C;
Base among sensed heating is rolled into 1.8mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 840 DEG C;
Steel band is air-cooled to 710 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 3:
Table 3
Embodiment 4
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.66%, Si:25Wt%, Mn:0.94Wt%, Cr:0.017Wt%, P:0.010Wt%, S:0.0020Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 20 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 950 DEG C of roughing inlet temperature, 920 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1180 DEG C;
Base among sensed heating is rolled into 2.0mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 840 DEG C;
Steel band is air-cooled to 700 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 4:
Table 4
Embodiment 5
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.65%, Si:0.25Wt%, Mn:0.95Wt%, Cr:0.018Wt%, P:0.010Wt%, S:0.0022Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 22 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 950 DEG C of roughing inlet temperature, 920 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1180 DEG C;
Base among sensed heating is rolled into 2.5mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 820 DEG C;
Steel band is air-cooled to 700 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 5:
Table 5
Embodiment 6
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.66%, Si:0.26Wt%, Mn:0.96Wt%, Cr:0.017Wt%, P:0.010Wt%, S:0.0023Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 23 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 950 DEG C of roughing inlet temperature, 920 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1170 DEG C;
Base among sensed heating is rolled into 3.0mm thickness hot-strip, exit temperature at finishing control through 7 passage finish rolling At 820 DEG C;
Steel band is air-cooled to 700 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 6:
Table 6
Embodiment 7
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.65%, Si:0.27Wt%, Mn:0.97Wt%, Cr:0.017Wt%, P:0.010Wt%, S:0.0020Wt%, Cu: 0.0060Wt%, Ni:0.005Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 23 DEG C of the tundish degree of superheat, pulling rate 4.80m/min, slab thickness 95mm;
Slab is rolled through three passage roughing, 950 DEG C of roughing inlet temperature, 920 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1180 DEG C;
Base among sensed heating is rolled into 3.5mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 820 DEG C;
Steel band is air-cooled to 700 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 7:
Table 7
Embodiment 8
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.66%, Si:0.28Wt%, Mn:0.90Wt%, Cr:0.016Wt%, P:0.009Wt%, S:0.0021Wt%, Cu: 0.0050Wt%, Ni:0.004Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 23 DEG C of the tundish degree of superheat, pulling rate 3.5m/min, slab thickness 90mm;
Slab is rolled through three passage roughing, 960 DEG C of roughing inlet temperature, 980 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1100 DEG C;
Base among sensed heating is rolled into 2.5mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 810 DEG C;
Steel band is air-cooled to 640 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 8:
Table 8
Embodiment 9
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.64%, Si:0.20Wt%, Mn:0.91Wt%, Cr:0.018Wt%, P:0.008Wt%, S:0.0023Wt%, Cu: 0.0040Wt%, Ni:0.003Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 23 DEG C of the tundish degree of superheat, pulling rate 5.0m/min, slab thickness 110mm;
Slab is rolled through three passage roughing, 970 DEG C of roughing inlet temperature, 980 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1160 DEG C;
Base among sensed heating is rolled into 2.0mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 870 DEG C;
Steel band is air-cooled to 740 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 9:
Table 9
Embodiment 10
In embodiment completely without head ESP bar strip continuous casting and rolling flow path production RE65Mn steel process flow be mixed iron blast → → slow cooling → finished product is batched in molten iron pretreatment → BOF → LF → ESP continuous casting and rolling →.
The raw material such as the present embodiment molten iron, steel scrap successively carry out converter smelting, LF refining, and molten steel composition control is:C: 0.65%, Si:0.24Wt%, Mn:0.97Wt%, Cr:0.017Wt%, P:0.007Wt%, S:0.0024Wt%, Cu: 0.00450Wt%, Ni:0.0045Wt%, remaining is Fe and inevitable impurity.
The passed through ESP producing line continuous casting of molten steel through LF refining, roughing, finish rolling, batch, retarded cooling process generates different-thickness Hot-strip.
Continuous casting working procedure controls 23 DEG C of the tundish degree of superheat, pulling rate 6.0m/min, slab thickness 100mm;
Slab is rolled through three passage roughing, 950 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature;
It will control through the sensed stove heating of base product among roughing, induction furnace IH outlet temperature at 1150 DEG C;
Base among sensed heating is rolled into 2.0mm thickness hot-strip, exit temperature at finishing control through 5 passage finish rolling At 850 DEG C;
Steel band is air-cooled to 640 DEG C through laminar flow section, is batched subsequently into coiling machine as coil of strip;
By outbound after coil of strip slow cooling 48 hours.
The performance of the RE65Mn steel of generation is as shown in table 10:
Table 10
It should be noted that floating of the RE65Mn steel of above-described embodiment generation on thickness is very small can be ignored not Meter, 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 thin based on the production of ESP bar strip continuous casting and rolling flow path The method of specification RE65Mn steel, slab is not required to soaking stove heating Direct Rolling under high pulling rate, and the technological process of production is short, belongs to low energy Green manufacturing process regime is consumed, the hot-rolled product skin decarburization mild degree produced, properties of product are stable, dimensional tolerance is small, Hot-rolled state can reach 1.5mm Ultra-thin band, can reduce cold rolling process rolling pass, reach energy-saving " with Bao Daihou " Purpose.
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 thin gauge RE65Mn 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 thin gauge RE65Mn 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 (3)

1. a kind of method based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel, which is characterized in that including:
Select raw material, wherein the raw material include by mass percentage:0.64~0.66% C, 0.19~0.28% Si, 0.90~0.97% Mn, 0.16~0.18% Cr ,≤0.0040% S ,≤0.0012% P ,≤0.10% Ni ,≤0.10% Cu, remaining is ferro element;
The raw material are successively carried out to converter smelting, the refining of LF furnace;
The molten steel to be formed will be refined by the hot-strip of ESP producing line generation different-thickness from the LF furnace;Wherein, described In ESP producing line, roughing outlet temperature is 920~980 DEG C, and the temperature of finish rolling outlet is 810~870 DEG C, induction heating outlet Temperature be 1100~1180 DEG C, the hot-strip with a thickness of 1.5~3.5mm;
Using the cooling hot-strip of the air-cooled mode of section cooling, 640~740 DEG C are cooled to, is batched subsequently into coiling machine For coiled strip steel, outbound after the coiled strip steel slow cooling.
2. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel, special Sign is,
In the ESP producing line, 3.5~6.0m/min of pulling speed of continuous casting, 90~110mm of slab thickness.
3. the method as described in claim 1 based on ESP bar strip continuous casting and rolling flow path production thin gauge RE65Mn steel, special Sign is,
In the ESP producing line, roughing inlet temperature is >=950 DEG C.
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