CN101906580B - Non-oriented electrical steel containing vanadium and titanium and preparation method thereof - Google Patents
Non-oriented electrical steel containing vanadium and titanium and preparation method thereof Download PDFInfo
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- CN101906580B CN101906580B CN2010102781784A CN201010278178A CN101906580B CN 101906580 B CN101906580 B CN 101906580B CN 2010102781784 A CN2010102781784 A CN 2010102781784A CN 201010278178 A CN201010278178 A CN 201010278178A CN 101906580 B CN101906580 B CN 101906580B
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Abstract
The invention relates to the field of metallurgy and provides a non-oriented electrical steel containing vanadium and titanium, which comprises the following chemical components in percentage by weight: 0.001-0.005% of C, 0.85-1.00% of Si, 0.15-0.35% of Mn, less than or equal to 0.025% of P, less than or equal to 0.008% of S, 0.30-0.40% of Als, less than or equal to 0.004% of N, greater than 0 and less than or equal to 0.01% of Ti, greater than 0 and less than or equal to 0.01% of V, the balance Fe and unavoidable impurities. Precipitation of fine dispersive vanadium and titanium carbonitrides are reduced by reasonable component design. In the preparation method, the temperature in a heating step is 1140-1170 DEG C, the initial rolling temperature of finish rolling is greater than or equal to 1030 DEG C, the finishing temperature is 890-930 DEG C, and the temperature in the coiling step is greater than or equal to 650 DEG C. The formation and effect of the vanadium and titanium precipitate are further inhibited thermodynamically and dynamically by process design. By inhibiting the adverse effects of vanadium and titanium, the non-oriented electrical steel containing vanadium and titanium meeting the requirement of electromagnetic performance can be produced, thereby enlarging the source range of smelting raw material of the non-oriented electrical steel, especially the utilization of recycled steel products, and effectively reducing the production cost of the non-oriented electrical steel.
Description
Technical field
The present invention relates to field of metallurgy, especially a kind of vanadium and titanium non-oriented electrical steel and preparation method thereof that contains.
Background technology
The vanadium titanium is a steel alloying element commonly used, in steel, adds an amount of vanadium titanium and the vanadium titanium carbonitride that forms, can play the effect of crystal grain thinning, precipitation strength; Simultaneously, the vanadium titanium can also improve reheat stage grain coarsening temperature.Therefore, the vanadium titanium micro-alloyed steel possesses good intensity, toughness, resistance to corrosion, wear resistance and the ability etc. of load that withstands shocks, and extensively applies to fields such as building, engineering machinery, bridge automobile, railway as structure iron.
For non-oriented electrical steel, when average crystal grain diameter was big, the crystal boundary area occupied reduced, and coercive force and magnetic hysteresis loss reduce; But grain-size is big, and its domain size increases, and eddy current damages and increases.Therefore in order to guarantee good electromagnetic performance, require crystal grain more carefully good different more with structure iron, non-oriented electrical steel requires grain-size at 30～200 microns usually.Growing up of vanadium titanium restriction non-oriented electrical steel crystal grain makes non-oriented electrical steel reduce in hot rolling and cold rolling back recrystallization crystal particle dimension; Simultaneously, the vanadium titanium precipitate of small and dispersed also causes forming { the 111} texture, so the existence of vanadium titanium will cause the deterioration of non-oriented electrical steel electromagnetic performance that is unfavorable for the non-oriented electrical steel electromagnetic performance.Therefore to those skilled in the art, in the smelting process of non-oriented electrical steel, vanadium and titanium Chang Zuowei harmful element need be controlled at extremely low level.But in smelting process, remove the contained vanadium of molten steel fully and the titanium difficulty is very big, cost is high.In order to reduce the smelting difficulty, just need the source of the raw materials for metallurgy of strict control non-oriented electrical steel, so the selectable range of raw materials for metallurgy is little, has increased production cost, is unfavorable for reclaiming the utilization of steel.
Summary of the invention
Technical problem to be solved by this invention provide a kind of can satisfy the requirement of non-oriented electrical steel electromagnetic performance contain vanadium and titanium non-oriented electrical steel and preparation method thereof.
The technical solution adopted for the present invention to solve the technical problems is: contain the vanadium and titanium non-oriented electrical steel; The weight percent of its chemical ingredients is C 0.001～0.005%, Si 0.85～1.00%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.30～0.40%, N≤0.004%, 0＜Ti≤0.01%, 0＜V≤0.01%, and surplus is Fe and unavoidable impurities.
Silicon can significantly reduce iron loss, but silicon also makes magnetic induction density descend when reducing iron loss, therefore for obtaining satisfied electromagnetic performance, silicone content is controlled at 0.85～1.00%.
Aluminium is in 0.005～0.014% scope, and iron loss obviously increases, therefore in non-oriented electrical steel aluminium content be≤0.003% or>=0.15%.Aluminium content >=0.15% o'clock can play the effect identical with improving the silicon amount.High aluminium content can be through forming the formation that AlN suppresses vanadium titanium carbonitride, and therefore non-oriented electrical steel of the present invention is controlled at 0.30～0.40% with aluminium content.
Sulphur is very harmful to magnetic, makes coercive force and magnetic hysteresis loss increase, and magneticinduction is stressed to reduce, and crystal grain diminishes, and is therefore low more good more, from cost consideration, and control S≤0.008%.
Manganese preferential with steel in sulphur form MnS, so the effect of manganese and sulphur content have substantial connection, when sulphur content was 0.004%～0.017%, raising manganese content can promote grain growth; Sulphur content＜0.004% o'clock, manganese content improve separates out tiny MnSiN easily
2, make crystal grain attenuate; But when reducing sulphur and manganese content at the same time, more can promote growing up of crystal grain, so the present invention controls Mn 0.15～0.35% by routine when reducing sulphur content.
Phosphorus is prone to gather partially along crystal boundary, but from magnetic property, remains at present in different understanding, by routine control P≤0.025%.
Carbon, nitrogen are very harmful to magnetic property, and simultaneously in order to suppress the formation of vanadium titanium carbonitride, content is low more good more, and from cost consideration, carbon content is controlled at 0.001～0.005%, control N≤0.004%.
Further, said non-oriented electrical steel is that thickness is the steel band of 0.5mm.
Further, iron loss≤5.5W/kg.
Further, magnetic strength >=1.70T.
Design through reasonable component; Separating out of the vanadium titanium carbonitride of minimizing small and dispersed; Suppress the disadvantageous effect of vanadium titanium to the non-oriented electrical steel electromagnetic performance; The vanadium and titanium non-oriented electrical steel that contains that the requirement of non-oriented electrical steel electromagnetic performance is satisfied in feasible production becomes possibility, has overcome those skilled in the art's technological prejudice.Enlarge the source range that comes of non-oriented electrical steel raw materials for metallurgy, especially can promote to reclaim the use of steel in non-oriented electrical steel is produced, can effectively reduce the production cost of non-oriented electrical steel.
The above-mentioned preparation method who contains the vanadium and titanium non-oriented electrical steel, process step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, the temperature in the heating steps is 1140～1170 ℃; The start rolling temperature of finish rolling is 890～930 ℃ for >=1030 ℃, finishing temperature, and the temperature of batching in the step is >=650 ℃.
Further, said cold rolling be once cold rolling, cold rolling accumulative total draft is 75～80%.
Further; Said annealing steps adopts the dual-purpose unit of zinc-plated/continuous annealing that comprises low-temperature heat section and heat section; The temperature out of wherein low-temperature heat section is that 780～850 ℃, the exit plate temperature of heat section are 920～950 ℃, and the heat section time is 32～43s.
Further, be provided with de-scaling water device between said each passage of roughing step, roughing and the finish rolling, said finish rolling begins temperature and controls through the de-scaling water unlatching group number between the unlatching of de-scaling water passage, roughing and the finish rolling of roughing step.
Heating temperature is 1140～1170 ℃, can reduce the solid solution content of the second phase forming element, and guarantees the finish rolling start rolling temperature.The start rolling temperature of finish rolling step is 890～930 ℃ for >=1030 ℃, finishing temperature, can guarantee the stability that finish rolling is rolling, and the motivating force that improves the ferrite crystal grain recrystallize and grow up guarantees the thick of crystal grain after the finish rolling.The temperature of batching in the step is >=650 ℃, and high coiling temperature helps forming thick recrystal grain, and promotes separating out and alligatoring of AlN, vanadium titanium carbonitride, can promote grain growth and formation favorable texture in the cold rolling after annealing step.Through selection of process parameters and optimization; The above-mentioned the present invention of being used for contains the preparation method of vanadium and titanium non-oriented electrical steel; Can use common hot continuous rolling unit to carry out hot rolling and finish rolling, cooperate the use of zinc-plated/dual-purpose unit of continuous annealing, when the grain size that guarantee to obtain favourable electromagnetic performance and texture, assurance contain the electromagnetic performance of vanadium and titanium non-oriented electrical steel; Also equipment cost, production cost be will reduce greatly, production, the popularization of vanadium and titanium non-oriented electrical steel helped containing.
Simultaneously; Through processing parameter and the coupling of separating out rule; Especially hot rolling, finish rolling, batch parameters of choice and optimization; On the basis that the formation and the influence of vanadium titanium precipitate is suppressed through composition, formation and influence to vanadium titanium precipitate on thermodynamic, the kinetics further suppress, and can further improve the electromagnetic performance that the present invention contains the vanadium and titanium non-oriented electrical steel.
In sum; Combination through the design of mentioned component design and processes; Through composition and technology work along both lines can obtain optimal performance contain the vanadium and titanium non-oriented electrical steel; Also promptly contain the vanadium and titanium non-oriented electrical steel as a kind of optimum; The weight percent of its chemical ingredients is C 0.001～0.005%, Si 0.85～1.00%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.30～0.40%, N≤0.004%, 0＜Ti≤0.01%, 0＜V≤0.01%, and surplus is Fe and unavoidable impurities; Its production craft step comprises heating, roughing, finish rolling, batches, cold rolling, annealing; Wherein the temperature in the heating steps is 1140～1170 ℃; The start rolling temperature of finish rolling is 890～930 ℃ for>=1030 ℃, finishing temperature; The temperature of batching in the step is>=650 ℃, and cold rolling employing accumulative total draft is 75～80% once cold rolling.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
The vanadium and titanium non-oriented electrical steel that contains of the present invention; The weight percent of its chemical ingredients is C 0.001～0.005%, Si0.85～1.00%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.30～0.40%, N≤0.004%, 0＜Ti≤0.01%, 0＜V≤0.01%, and surplus is Fe and unavoidable impurities.
Through the reasonable component design, suppressed the disadvantageous effect of vanadium titanium to the non-oriented electrical steel electromagnetic performance.Therefore can produce through the production unit and the production technique of existing non-oriented electrical steel, and can produce the non-oriented electrical steel of each trade mark according to the selection of manufacturing condition.Concrete, said non-oriented electrical steel is that thickness is the steel band of 0.5mm.Further, according to the GB/T2521-2008 standard, above-mentioned non-oriented electrical steel is the non-oriented electrical steel that a kind of corresponding trade mark is 50PW600, and is concrete, iron loss≤5.5W/kg, magnetic strength>=1.70T.
Best, the above-mentioned preparation method who contains the vanadium and titanium non-oriented electrical steel, process step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, the temperature in the heating steps is 1140～1170 ℃; The start rolling temperature of finish rolling is 890～930 ℃ for >=1030 ℃, finishing temperature, and the temperature of batching in the step is >=650 ℃.
Above-mentioned parameter is when the grain size that guarantee to obtain favourable electromagnetic performance and texture, assurance contain the electromagnetic performance of vanadium and titanium non-oriented electrical steel; Formation and influence to vanadium titanium precipitate on thermodynamic, the kinetics further suppress, and can further improve the electromagnetic performance that the present invention contains the vanadium and titanium non-oriented electrical steel.
For reducing process cost, improve output, adopt in the production of once cold rolling method; But the recrystallization texture of cold rolling after annealing and cold rolling draft have obvious relation; Along with the increase of cold rolling draft, in the recrystallization texture the disadvantageous texture component of magnetic is increased, the favorable texture component reduces; Magnetic strength reduces, and the iron loss anisotropy increases.Therefore, best, said cold rolling be once cold rolling, cold rolling accumulative total draft is 75～80%.Concrete, cold rolling before the thickness of slab be 2.0～2.5mm, the nominal thickness after cold rolling is 0.5mm.
Annealing after cold rolling can be adopted existing annealing device and annealing process.But existing non-oriented electrical steel annealing device is specific equipment, and cost is high, in order further to reduce equipment cost; Said annealing steps adopts the dual-purpose unit of zinc-plated/continuous annealing that comprises low-temperature heat section and heat section; But this dual-purpose unit does not comprise the high temperature constant temperature section, and therefore, the temperature out of concrete wherein low-temperature heat section is that 780～850 ℃, the exit plate temperature of heat section are 920～950 ℃; The heat section time is 32～43s; Can guarantee to be with the sufficient soaking time of steel, promote ferrite crystal grain to grow up, obtain thick, uniform recrystal grain.
In Heating temperature also is under the certain prerequisite of roughing start rolling temperature; Except that forcing cooling; The rolling temperature of each passage and coiling temperature mainly receive the influence of naturally cooling, rolling speed; The use of ordinary hot tandem rolling unit for ease; Convenient control to the finish rolling start rolling temperature is provided with de-scaling water device between said each passage of roughing step, roughing and the finish rolling, and said finish rolling begins temperature and controls through the de-scaling water unlatching group number between the unlatching of de-scaling water passage, roughing and the finish rolling of roughing step.
Embodiment
According to composition design and processes of the present invention design having carried out engineering test, that produces the trade mark and be 50PW600 contains the vanadium and titanium non-oriented electrical steel in certain factory, and other technologies except that the processing parameter of having explained are implemented by existing requirement.
Equipment comprises 120 tons of LD converters, comprise five passage roughing and the hot continuous rolling unit of six frame finish rolling, the dual-purpose unit of zinc-plated/continuous annealing.Concrete production process is followed successively by: steel billet, heating, roughing, finish rolling, batch, cold rolling, annealing.In the production process, open in the roughing step, one group of dephosphorization water is set between roughing and the finish rolling except that second and the the de-scaling water of other passages the four-pass.Concrete chemical ingredients sees that table 1, processing parameter see that table 2, electromagnetic performance see table 3.Cold rolling finished product nominal thickness is 0.5mm.
The chemical ingredients of table 1 embodiment
The processing parameter of table 2 embodiment
The electromagnetic performance of table 3 embodiment
| Embodiment | Iron loss (W/kg) | Magnetic strength (T) |
| 1 | 4.9 | 1.74 |
| 2 | 5.0 | 1.74 |
| 3 | 5.2 | 1.73 |
| 4 | 5.1 | 1.73 |
| 5 | 5.4 | 1.71 |
Claims (5)
1. the preparation method who contains the vanadium and titanium non-oriented electrical steel; The weight percent of its chemical ingredients is C 0.001～0.005%, Si 0.85～1.00%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.30～0.40%, N≤0.004%, 0＜Ti≤0.01%, 0＜V≤0.01%, and surplus is Fe and unavoidable impurities; Process step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, and wherein the temperature in the heating steps is 1140～1170 ℃, and the start rolling temperature of finish rolling is 890～930 ℃ for>=1030 ℃, finishing temperature, and the temperature of batching in the step is>=650 ℃.
2. the preparation method who contains the vanadium and titanium non-oriented electrical steel as claimed in claim 1 is characterized in that: the said cold rolling once cold rolling that is, cold rolling accumulative total draft is 75～80%.
3. the preparation method who contains the vanadium and titanium non-oriented electrical steel as claimed in claim 1; It is characterized in that: said annealing steps adopts the dual-purpose unit of zinc-plated/continuous annealing that comprises low-temperature heat section and heat section; The temperature out of wherein low-temperature heat section is that 780～850 ℃, the exit plate temperature of heat section are 920～950 ℃, and the heat section time is 32～43s.
4. the preparation method who contains the vanadium and titanium non-oriented electrical steel as claimed in claim 1; It is characterized in that: be provided with de-scaling water device between said each passage of roughing step, roughing and the finish rolling, said finish rolling begins temperature and controls through the de-scaling water unlatching group number between the unlatching of de-scaling water passage, roughing and the finish rolling of roughing step.
5. that adopts that preparation method according to claim 1 produces contains the vanadium and titanium non-oriented electrical steel, and it is characterized in that: said non-oriented electrical steel is that thickness is the steel band of 0.5mm; Iron loss≤5.5W/kg; Magnetic strength>=1.70T.
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| CN2010102781784A CN101906580B (en) | 2010-09-10 | 2010-09-10 | Non-oriented electrical steel containing vanadium and titanium and preparation method thereof |
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| CN103397249B (en) * | 2013-07-30 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Hypoxemia low-carbon electrical steel and production method thereof |
| CN103447149A (en) * | 2013-09-02 | 2013-12-18 | 攀枝花市长森工贸有限公司 | Iron-titanium ore magnetic separator |
| CN105013819B (en) * | 2015-07-20 | 2017-11-28 | 北京首钢股份有限公司 | A kind of preparation method of hot rolling electrical steels |
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| EP2031079B1 (en) * | 2006-06-16 | 2021-01-13 | Nippon Steel Corporation | High-strength electromagnetic steel sheet and process for producing the same |
| CN100519808C (en) * | 2007-12-05 | 2009-07-29 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN101654729B (en) * | 2009-09-17 | 2011-04-27 | 攀钢集团研究院有限公司 | Hot rolling method of cold-rolling low-carbon non-oriented electrical steel |
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