CN101543837B - Method for manufacturing Fe-Mn-C series high-manganese steel thin strip by continuous casting and tandem rolling - Google Patents
Method for manufacturing Fe-Mn-C series high-manganese steel thin strip by continuous casting and tandem rolling Download PDFInfo
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- CN101543837B CN101543837B CN2008100350211A CN200810035021A CN101543837B CN 101543837 B CN101543837 B CN 101543837B CN 2008100350211 A CN2008100350211 A CN 2008100350211A CN 200810035021 A CN200810035021 A CN 200810035021A CN 101543837 B CN101543837 B CN 101543837B
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Abstract
The invention discloses a method for manufacturing a Fe-Mn-C series high-manganese steel thin strip by continuous casting and tandem rolling, which comprises the following steps of continuous casting of the thin strip and on-line thermal rolling, wherein the rate of a rotary line is 0 to 150 meters per minute; the superheating degree of a pouring box during pouring is between 25 and 60 DEG C, the liquid level is 150 to 350 millimeters, and the roll gap of a casting roll is 1.5 to 8.0 millimeters; the surface of molten steel can burn natural gases; and the rolling temperature range is between 1,150 and 750 DEG C. Compared with the prior art, the method has the advantages that the burning loss of Mn elements is little and the equal-axis crystal ratio of casting strips is high.
Description
Technical field
The present invention relates to high-manganese steel thin strip continuous casting and rolling manufacturing approach, belong to the sheet-band continuous casting and rolling technology of Fe-Mn-C series high-manganese steel especially.
Background technology
Strength and toughness is two important indicators of exosyndrome material mechanical performance.Generally speaking, intensity increases, and simultaneous toughness descends, the tough long-pending definite value that is.How to overcome this law, the novel steel grade of making high-strength tenacity becomes the significant challenge of metallurgical material industry.TRIP (Transformation inducedplastic) steel; It is transformation induced plasticity steel; Typical composition (wt.%) is: C 0.2, Mn1～2, Si1～2; Tissue is made up of 50～60% ferrites, 25～40% bainites or a small amount of martensite and 5～15% retained austenites, and retained austenite is introduced phase transformation strengthening and plasticity growth when martensite transfor mation in deformation process, and the retained austenite of gradual transformation reaches the strength of materials and the synchronous target that increases of plasticity.But, because the caused percentage elongation increase of martensite phase transformation is very limited, so it is more suitable that this steel is called the TRIP-assisted steel.
The tensile strength of TRIP steel (Rm) * percentage elongation (A) generally is lower than 25,000Mpa%, and have tangible black brittleness transition phenomenon, and its Extending flange Perfor is lower, further improves its combination property through follow-up deep processing, and effect is effective.In addition, the TRIP steel is very high to the precision control requirement of manufacturing parameter, complex procedures.
Germany Grassel etc. (O Grassel, " High strength Fe-Mn-(Al, Si) TRIP/TWIP steelsdevelopment-properties-application "; International Journal of Plasticity, 2000,16:1391), research Fe-Mn-Si-Al finds when being the TRIP steel; When Mn content reaches 25～30%; Al, Si are 2～3% o'clock, after suitably processing, and its R
m* A reaches low-alloy TRIP steel twice, thereby produces a kind of novel high tough Fe-Mn-Si-Al series high-manganese steel.This novel steel grade evenly forms a large amount of austenite strain inducing twins in deformation process.This serial potassium steel generally has moderate strength (yield strength 280MPa, tensile strength are 650MPa) and very high percentage elongation (80～90%); Potassium steel does not have the black brittleness transition temperature, even in the time of-150 ℃, its percentage elongation still can reach 75%.As far as being used for deep punching steel, the major parameter of weighing the bump behavior is the Charpy ballistic work relevant with temperature and the bump absorption ability (ESIAE) of unit volume, and the ESIAE that experiment showed, potassium steel is 2～3 times of common deep punching steel.
The typical composition of Fe-Mn-Si-Al series high-manganese steel is:＜0.2C, 10～30Mn, 1～6Si; 1～8Al, Germany mainly concentrate on physical and mechanical properties (the G Frommeyer of potassium steel to the research of this system potassium steel level that is in a leading position; Et al, " Physical and mechanical properties ofiron-aluminium-(Mn, Si) lightweight steels "; La Revue de Metallurgie, 2000,1245.); Cold rolling performance and texture research (S Vercammen, et al, " Cold rolling behaviour ofan austenitic Fe-30Mn-3Al-3Si TWIP-steel:the importance of deformationtwinning "; Acta Materialia, 2004,52:2005).Domestic University of Science & Technology, Beijing has carried out Primary Study (Mi Zhenli etc., " developmental research of high-strength high-plasticity TWIP steel ", iron and steel to the composition-mechanical performance of material; 2005,40 (1): 58), and inquired into relation (the P Yang of potassium steel distortion twin orientation with manufacturing process; Et al, " Dependence of deformation twinning on grainorientation in a high manganese steel ", Scripta Materialia; 2006,1), and Nb influence rule (B X Huang; Et al, " Mechanial behavior and martensitictransformation of an Fe-Mn-Si-Al-Nb alloy ", Materials Science and Engineering; 2006,1).
The characteristics of Fe-Mn-Si-Al series high-manganese steel are low C, high Mn, smelt difficulty.Recently, day disclosure series of patents, C21-007/68, C21-005/28, C21C-007/04, C21C-007/076, C21C-007/10, the low-carbon high-manganese steel smelting is obtained certain progress.In addition, the Al constituent content is higher in the Fe-Mn-Si-Al series high-manganese steel, and its process of setting and orthodox car are used steel, like IF steel, mild steel etc., has very big difference.In sheet billet continuous casting or die casting process, segregation usually can take place at the crystal boundary place in Al when solidifying, and forms compound (Fe between the low-melting-point metal that fusing point is about 1170 ℃
2Al
5), cause the defective of as-cast structure, easy to crack during hot continuous rolling, the thermoplasticity of material is very poor; In addition, Al can be with the SiO in the molten steel
2With the MnO reduction, increase the viscosity of molten steel, destroy the surface and the internal soundness of strand.Therefore, industry thinks that there is very big difficulty in industry extensive (continuous casting or the die casting-hot rolling) manufacturing of Fe-Mn-Si-Al series high-manganese steel at present, how to study as problem in science, does not still have practical applications and promotes precedent.
Arcelor company and TyhssenKrupp company are also cooperating to carry out the exploitation of Fe-Mn-C potassium steel as the main supplier of global automobile steel, specifically comprise smelting process, institutional framework, processed of potassium steel etc.; X-IP1000 product ((method) D Cornette, P Cugy, A Hildenbrand have been developed at present; The automotive safety parts are with the strong Fe-Mn TWIP of superelevation steel, world steel, 2006; (3): 39), typical composition is: 0.6C, 23Mn; 0.05～1.0Si, 0～0.008Al, 0.001～0.01N.X-IP1000 tensile strength 1162Mpa, yield strength 599Mpa, uniform elongation reaches 52.8%, and has very good deep drawability, processability and impact resistance.
If reach the index of 1162Mpa, uniform elongation 52.8%, need Mn (>=23%), C (>=0.6%) content all higher, so high Mn content proposes very high specification requirement to utilizing continuous casting process production, and risk is very big.The difficulty of potassium steel casting mainly is: the microsegregation of Mn element causes solidified shell intensity very low in (1) process of setting; Intensity was too high when (2) temperature reduced, the straightening difficulty; (3) gross segregation of alloying element; (4) scaling loss of alloying element on the liquid level.For this reason, iron company attempts utilizing traditional die casting-cogging Forging Technology, perhaps utilizes near-net-shape moulding process of new generation, produces like CSP, sheet-band continuous casting and rolling.
An Sailemi tal fibre and Thyssen Krupp two tame iron companies sign an agreement, and both sides research and develop this automobile with cooperation and use potassium steel.The scope of joint study exploitation comprises smelting, composition and the processing technology of potassium steel.R&D work will be undertaken by R&D team's cooperation of two companies, and the intellectual property that forms in the research and development (like patent) will be shared by both party, and the producing and selling of the potassium steel of developing and popularization will be carried out respectively by An Sailemi tal fibre and Thyssen Krupp.The electrogalvanizing product had produced automobile component in 2007, had had the ability of putting on market.
WO 2006/094718A1 discloses the equipment and technology that utilizes CSP to make potassium steel.Potassium steel composition:＜0.8C, 27Mn, 1～6Si, 1～6Al.Behind continuous casting thickness≤120mm slab, make its temperature even through middle heating furnace, then the direct heat tandem rolling.
Strip continuous casting technology has the characteristics of short flow process, near-net-shape, is fit to very much make the difficult rolled material of high-strength plasticity; And the characteristic of strip continuous casting technology rapid solidification can effectively reduce elements segregation in the high-alloy steel, improves the processability of material.Thus it is clear that, utilize strip continuous casting technology to make potassium steel and have the advantage on the flow process.
TyhssenKrupp company attempts adopting belt thin strap continuous casting test milling train to produce and produces potassium steel torrid zone volume (the Karl Heinz Spitzer that thickness is 6mm, width 300mm; Et al; The basic technology technical research of the direct Foundry Production new steel grade of band steel, first Sino-German (Europe) metallurgical technology Conference Papers collection, 212); The surface is good with quality of edges, and this has tentatively proved and has adopted strip continuous casting technology to produce the feasibility of the potassium steel roll coil of strip.US20040074628A1 discloses a kind of method of utilizing twin-roll thin strip continuous casting to produce potassium steel.More than two patents all relate to the Fe-Mn-Si-Al series high-manganese steel, C content extremely low (0.003%) and Mn content is high.As previously mentioned, this potassium steel smelting difficulty is big, is the extensive bottleneck of making of industry.
Korea S's Posco (POSCO) is very big to Fe-Mn-C series high-manganese steel thin strip continuous casting technology input, is in world lead level.Patent KR100650559B, KR100650562B disclose the strip continuous casting technology of potassium steel, and produce the good original shape steel band of surface quality.Around the high-manganese steel thin strip continuous casting technology, patent KR20040055925 discloses the characteristics of crystallization roller; In addition, patent KR20040020465, KR20040020464, KR20040020463, KR20060074638 have set forth technical problems such as processing of crystallization roller and surface quality control.
In the Fe-Mn-C series high-manganese steel, the Mn constituent content generally surpasses 13%.The vapour pressure of Mn is very high in the molten steel, volatilization easily, Composition Control difficulty.Especially under the thin strap continuous casting process conditions, molten steel unprotect slag.Therefore, the control of Mn content is the guardian technique of high-manganese steel thin strip continuous casting.Above patent does not all relate to this.
For the Fe-Mn-C series high-manganese steel, its solid-liquid phase temperature range is bigger, like common Fe22Mn0.6C potassium steel; Temperature range is near 200 ℃ of (C.Scott, et al, The developmentof a new Fe-Mn-C austenitic steel for automotive applications; La Revue de M é tallurgie-CIT; 2006, (6): 293-302), be austenite (no phase transformation) from solidifying to room temperature; Simultaneously, the strip casting process freezing rate is high, 100～10, between the 000 ℃/s.Therefore, this potassium steel solidifies and tends to the column crystal growth, and the strip tissue is made up of the column crystal of two-layer prosperity, and the normal shrinkage porosite in interface place also is prone to assemble field trash, and binding ability is poor, is prone to during use ftractureing at the interface.The patent of the relevant high-manganese steel thin strip continuous casting of POSCO does not relate to this.
Summary of the invention
The technical problem that the present invention will solve provides a kind of Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach, and this method can effectively be controlled the composition of Mn element, produces the good band steel of side and surface quality; In conjunction with suitable online hot-rolled process parameter, produce the higher even congruent axialite potassium steel tissue of equiaxial crystal ratio, avoid tangible column crystal interface, prevent shrinkage porosite or field trash clustering phenomena, guarantee that material has excellent properties for follow potentiality.
Design of the present invention is: thin strap continuous casting carries out on the vertical unit in footpath together at two rollers, and potassium steel liquid pours in the molten bath of being made up of crystallization roller and two side seal boards through big bag, tundish, and the crystallization roller is equipped with the fast self-checking device of roller, guarantees that rotational line speed is adjustable continuously; During casting, the control of the degree of superheat of tundish, liquid level control, and the crystallization roller gap all has a scope; Utilize the roll-force closed-loop control system, adjust crystallization roller speed, roll gap, liquid level in real time, guarantee that roll-force is floated within the specific limits in the strip casting process, the both sides solidified shell goes out band in the contact of Kiss point after crystallization rolling system.Because the very high easy oxidation of potassium steel alloy content reduces the quality of original shape steel band and influences its performance.In the high-manganese steel thin strip casting process, the molten steel surface can utilize combustion of natural gas, can play the effect of insulation on the one hand, prevents to form on current distribution device and the side seal board cold bloom; In addition, can above molten steel, form CO
2Atmosphere, the oxidation that alleviates molten steel; Particularly Mn element vapour pressure is high, high volatility, and the gas that combustion of natural gas forms can effectively reduce the scaling loss of Mn element, Mn elemental composition in the control high-manganese steel thin strip casting process.Or above the molten bath that the crystallization roller forms, also can directly lead to argon gas, CO
2, perhaps both mists can effectively reduce the Mn melting loss of elements, alleviate oxidation.
For solving the problems of the technologies described above, a kind of Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach of the present invention comprises following steps:
1) thin strap continuous casting: rotational line speed: 0～150m/min; Tundish degree of superheat during casting: 25～60 ℃, liquid level: 150～350mm, crystallization roller gap: 1.5～8.0mm; The molten steel surface can gas-firing;
2) online hot rolling: the rolling temperature scope is 1150～750 ℃.
Preferably; In the step 1), thin strap continuous casting adopts two rollers with the vertical unit in footpath, utilizes the roll-force closed-loop control system; The roller of adjustment crystallization in real time speed, roll gap, liquid level; Guarantee that roll-force is floated within the specific limits in the strip casting process, the both sides solidified shell goes out band in the contact of Kiss point after crystallization rolling system.
Preferably, in the step 1), all right argon gas, the CO of directly leading in molten steel surface in the molten bath in the strip casting process
2, perhaps both mists.
Preferably, step 2) in, the scope of rolling temperature is 1050～800 ℃.
Preferably, step 2) in,
For the potassium steel of C+Mn/6＜3.0, can be without hot rolling, perhaps less drafts 15%～25%; For C+Mn/6 is 3.0～4.0 potassium steel, and drafts 25%～50%, rate of deformation are greater than 10s
-1And for C+Mn/6＞4.0 potassium steel, drafts greater than 50%, rate of deformation is greater than 30s
-1
The present invention compared with prior art has following beneficial effect: in the strip casting process, and potassium steel liquid surface gas-firing in the molten bath, perhaps directly logical argon gas, CO
2, perhaps both mists play the effect that alleviates the alloying element scaling loss.On the online hot rolling technology,, can make that equiax crystal content does not exist tangible column crystal interface and shrinkage porosite and field trash clustering phenomena than higher in the sheet-band continuous casting and rolling potassium steel tissue through selecting suitable online hot-rolled process parameter.The Fe-Mn-C series high-manganese steel thin strip that the present invention makes, the Mn melting loss of elements is few, and content is controlled, and side and surface quality are good.
Description of drawings
Below will combine accompanying drawing and embodiment that the present invention is further specified.
Fig. 1 is the correlation sketch map of column crystal/proportion of equiaxed grain and C, Mn constituent content.
Fig. 2 is vertical twin-roll thin strip continuous casting tandem rolling testing machine sketch map.
Fig. 3 is the metallographic structure figure of instance 1 sample.
Fig. 4 is the metallographic structure figure of instance 2 samples.
Fig. 5 is the metallographic structure figure of instance 3 samples.
The specific embodiment
The Mn element is lower than 35% in the following example employing thin strap continuous casting potassium steel, particularly below 21%.The C element is lower than 1.0% in the thin strap continuous casting potassium steel, particularly below 0.8%.Al, Si content are below 1.0%.Crystallization roller gap scope is 1.5 ~ 8.0mm, and potassium steel casting tape thickness scope is 0.5 ~ 6mm.
As shown in Figure 1, wherein, A partly is a column crystal, and B partly is an equiax crystal.In the strip as-cast structure, column crystal/proportion of equiaxed grain is relevant with C, Mn constituent content.Visible among the figure, when C, Mn constituent content were low, equiax crystal content was high; C, Mn constituent content increase, and tend to form column crystal.Online hot rolling can directly change the austenite crystal shape; The more important thing is that at a certain temperature, after rate of deformation and deflection surpassed to a certain degree, dynamic recrystallization can take place crystal grain, formed equiax crystal.
In-line hot rolling mill is right after the thin strap continuous casting casting machine, and the rolling temperature scope is 1150 ~ 750 ℃, and best scope is between 1050 ~ 800 ℃.For C, potassium steel that Mn content is low, 1 left side, line of demarcation down can be without hot rolling among the figure, perhaps less drafts (＞15%); Along with C, Mn constituent content improve, among the figure, line of demarcation 1, between 2, drafts greater than 25%, rate of deformation is greater than 10s
-1The time satisfactory for result; And for high C, Mn content potassium steel, line of demarcation 2 is upper right among the figure, drafts greater than 50%, rate of deformation is greater than 30s
-1The time satisfactory for result.Equiaxial crystal ratio increases and improves with drafts, rate of deformation.
As shown in Figure 2, visible among the figure in the vertical twin-roll thin strip continuous casting tandem rolling testing machine, in the molten bath that potassium steel flow to the crystallization roller 2,3 in the tundish 1 is formed, above the molten bath, blow natural gas 4 burnings, perhaps directly logical argon gas, CO
2, or both mists play the effect that alleviates the alloying element scaling loss, the scaling loss of Mn element especially, and burn out rate is lower than 5%.Strip is through pinch roll 5 to in-line hot rolling mill 6.
Embodiment 1:
Electric furnace smelting is inserted in the big bag after composition is qualified, 1550 ℃ of tapping temperatures, and potassium steel liquid main component is (wt%): 15.83Mn as follows, 0.56C.Water between the water flowing copper material casting roller through tundish, the centre is unwrapped and is watered 1480 ℃ of temperature, molten steel surface by utilizing combustion of natural gas; Casting roller rotational line speed 28 ~ 80m/min, liquid level is measured by the eddy current monitor, is controlled at about 280mm; Domain of walker ± 10mm, intermesh determination 1.8mm.Do not carry out online hot rolling.
Composition and fabric analysis are carried out in sampling.The composition of strip steel is: 15.59Mn, 0.6C.Mn melting loss of elements rate is lower than 1.6%.Metallographic structure is as shown in Figure 3, and strip is made up of two-layer column crystal and middle equiax crystal, and equiaxial crystal ratio about 40% is not less than 30%.
Embodiment 2:
Electric furnace smelting is inserted in the big bag after composition is qualified, 1550 ℃ of tapping temperatures, and potassium steel liquid main component is (wt%): 21.08Mn as follows, 0.24C.Water between the water flowing copper material casting roller through tundish, the centre is unwrapped and is watered 1470 ℃ of temperature, the logical argon shield in molten steel surface; Casting roller rotational line speed 28 ~ 90m/min, liquid level is measured by the eddy current monitor, is controlled at about 280mm; Domain of walker ± 10mm, intermesh determination 2.5mm.Do not carry out online hot rolling.
Fabric analysis is carried out in sampling, and is as shown in Figure 4, significantly column crystal interface and shrinkage porosite and field trash clustering phenomena.
Embodiment 3:
Electric furnace smelting is inserted in the big bag after composition is qualified, 1550 ℃ of tapping temperatures, and potassium steel liquid main component is (wt%): 20.07Mn as follows, 0.16C.Water between the water flowing copper material casting roller through tundish, the centre is unwrapped and is watered 1470 ℃ of temperature, the logical argon shield in molten steel surface; Casting roller rotational line speed 28 ~ 90m/min, liquid level is measured by the eddy current monitor, is controlled at about 280mm; Domain of walker ± 10mm, intermesh determination 2.5mm.Online hot rolling, drafts 50%, through calculating, the rate of deformation of stabilization sub stage is roughly 27 ~ 40.5s
-1
Fabric analysis is carried out in sampling, and as shown in Figure 5, column crystal and shrinkage porosite and field trash clustering phenomena are not obvious.
Claims (4)
1. Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach is characterized in that comprising following steps:
1) thin strap continuous casting: rotational line speed: 0～150m/min; Tundish degree of superheat during casting: 25～60 ℃, liquid level: 150～350mm, crystallization roller gap: 1.5～8.0mm; Molten steel surface combustion natural gas;
2) online hot rolling: the rolling temperature scope is 1150～750 ℃; For the potassium steel of C+Mn/6＜3.0, without hot rolling, perhaps drafts 15%～25%; For C+Mn/6 is 3.0～4.0 potassium steel, and drafts 25%～50%, rate of deformation are greater than 10s
-1And for C+Mn/6＞4.0 potassium steel, drafts greater than 50%, rate of deformation is greater than 30s
-1
2. Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach as claimed in claim 1; It is characterized in that in the step 1) that thin strap continuous casting adopts two rollers with the vertical unit in footpath, utilizes the roll-force closed-loop control system; The roller of adjustment crystallization in real time speed, roll gap, liquid level; Guarantee that roll-force is floated within the specific limits in the strip casting process, the both sides solidified shell goes out band in the contact of Kiss point after crystallization rolling system.
3. Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach as claimed in claim 2 is characterized in that in the step 1) that the surface combustion of molten steel described in strip casting process natural gas replaces with molten steel surface combustion argon gas, CO
2, perhaps both mists.
4. Fe-Mn-C series high-manganese steel thin strip continuous casting and rolling manufacturing approach as claimed in claim 3 is characterized in that step 2) in, the scope of rolling temperature is 1050～800 ℃.
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| CN102069167B (en) * | 2010-11-11 | 2012-11-14 | 东北大学 | Method for preparing oriented silicon steel isometric crystal thin strip blank by twin-roll thin strip continuous casting |
| CN102206785B (en) * | 2011-04-23 | 2012-10-03 | 中国科学院合肥物质科学研究院 | Twinning induced plasticity alloy steel with columnar crystal structure and preparation method thereof |
| CN104379277B (en) * | 2013-11-27 | 2016-08-31 | 青岛玉兰祥商务服务有限公司 | A kind of twin crystal inducing plasticity steel and production method thereof |
| CN104138899A (en) * | 2014-06-23 | 2014-11-12 | 梧州恒声电子科技有限公司 | Control technology of hot-rolled steel plate |
| CN114034836A (en) * | 2021-11-03 | 2022-02-11 | 山东理工大学 | Method for measuring double-roller casting and rolling Kiss angle |
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