CN101914731A - High-magnetic induction non-oriented electrical steel containing vanadium and titanium and preparation method thereof - Google Patents
High-magnetic induction non-oriented electrical steel containing vanadium and titanium and preparation method thereof Download PDFInfo
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- CN101914731A CN101914731A CN 201010278193 CN201010278193A CN101914731A CN 101914731 A CN101914731 A CN 101914731A CN 201010278193 CN201010278193 CN 201010278193 CN 201010278193 A CN201010278193 A CN 201010278193A CN 101914731 A CN101914731 A CN 101914731A
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Abstract
The invention provides a high-magnetic induction non-oriented electrical steel containing vanadium and titanium, relating to the field of metallurgy. The high-magnetic induction non-oriented electrical steel containing the vanadium and the titanium comprises the following chemical components in percentage by weight: 0.001-0.005% of C, 0.50-0.65% of Si, 0.15-0.35% of Mn, P<=0.025%, S<=0.008%, 0.25-0.35% of Als, N<=0.007%, 0<Ti<=0.01%, 0<V<=0.01%, and the balance of Fe and inevitable impurities; and the precipitation of tiny dispersive vanadium-titanium carbonitrides is reduced through reasonable component design. In a preparation method of the high-magnetic induction non-oriented electrical steel containing the vanadium and the titanium, the temperature of a heating step is 1130-1160 DEG C; the start rolling temperature of precision rolling is not lower than 1020 DEG C, and the finish rolling temperature is 870-910 DEG C; coiling temperature is not lower than 650 DEG C; and the forming and the influence of vanadium-titanium precipitates are further inhibited from physical thermodynamics and dynamics through process design. The invention can produce the non-oriented electrical steel containing the vanadium and the titanium meeting the requirements for electromagnetic performance by inhibiting the negative influence of the vanadium and the titanium, enlarges the source range of smelting raw materials of the non-oriented electrical steel and especially effectively reduces the production cost of the non-oriented electrical steel due to the utilization of recovered steels.
Description
Technical field
The present invention relates to field of metallurgy, especially a kind of high-magnetic induction non-oriented electrical steel containing vanadium and titanium and preparation method thereof.
Background technology
The vanadium titanium is a steel alloying element commonly used, adds an amount of vanadium titanium and the vanadium titanium carbonitride that forms in steel, 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 thin more 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 provides a kind of high-magnetic induction non-oriented electrical steel containing vanadium and titanium that can satisfy the requirement of non-oriented electrical steel electromagnetic performance and preparation method thereof.
The technical solution adopted for the present invention to solve the technical problems is: high-magnetic induction non-oriented electrical steel containing vanadium and titanium, the weight percent of its chemical ingredients are that C 0.001～0.005%, Si 0.50～0.65%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.25～0.35%, N≤0.007%, 0＜Ti≤0.01%, 0＜V≤0.01%, surplus are 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 0.50～0.65%.
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 by forming the formation that AlN suppresses vanadium titanium carbonitride, and therefore non-oriented electrical steel of the present invention is controlled at 0.25～0.35% with aluminium content.
Sulphur is very harmful to magnetic, makes coercive force and magnetic hysteresis loss increase, and magneticinduction is emphasized to reduce, and crystal grain diminishes, and is therefore low more good more, for 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 routinely 0.15～0.35% when reducing sulphur content.
Phosphorus is easily poly-partially along crystal boundary, but from magnetic property, remains at present in different understanding, controls P≤0.025% routinely.
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 for cost consideration, carbon content is controlled at 0.001～0.005%, control N≤0.007%.
Further, described non-oriented electrical steel is that thickness is the steel band of 0.5mm.
Further, iron loss≤6.5W/kg.
Further, magnetic strength 〉=1.70T.
Design by 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 technology 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 preparation method of above-mentioned high-magnetic induction non-oriented electrical steel containing vanadium and titanium, processing step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, the temperature in the heating steps is 1130～1160 ℃; The start rolling temperature of finish rolling is 870～910 ℃ for 〉=1020 ℃, finishing temperature, and the temperature of batching in the step is 〉=650 ℃.
Further, described cold rolling be once cold rolling, cold rolling accumulative total draft is 75～80%.
Further, described 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 750～820 ℃, the exit plate temperature of heat section are 890～920 ℃, and the heat section time is 32～43s.
Further, be provided with de-scaling water device between described each passage of roughing step, roughing and the finish rolling, described finish rolling begins temperature and controls by 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 1130～1160 ℃, 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 870～910 ℃ for 〉=1020 ℃, 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 the grain growth in the cold rolling after annealing step and form favorable texture.By 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, by processing parameter and the coupling of separating out rule, especially hot rolling, finish rolling, the selection of batching parameter and optimization, on the basis that the formation and the influence of vanadium titanium precipitate is suppressed by 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 by the design of mentioned component design and processes, by composition and technology work along both lines can obtain optimal performance contain the vanadium and titanium non-oriented electrical steel, also promptly as a kind of high-magnetic induction non-oriented electrical steel containing vanadium and titanium of optimum, the weight percent of its chemical ingredients is that C 0.001～0.005%, Si 0.50～0.65%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.25～0.35%, N≤0.007%, 0＜Ti≤0.01%, 0＜V≤0.01%, surplus are 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 1130～1160 ℃, the start rolling temperature of finish rolling is 870～910 ℃ for 〉=1020 ℃, 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
The present invention is further described below in conjunction with drawings and Examples.
High-magnetic induction non-oriented electrical steel containing vanadium and titanium of the present invention, the weight percent of its chemical ingredients are that C 0.001～0.005%, Si 0.50～0.65%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.25～0.35%, N≤0.007%, 0＜Ti≤0.01%, 0＜V≤0.01%, surplus are Fe and unavoidable impurities.
By the reasonable component design, suppressed the disadvantageous effect of vanadium titanium to the non-oriented electrical steel electromagnetic performance.Therefore can produce by 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, described 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 50PW800, and is concrete, iron loss≤6.5W/kg, magnetic strength 〉=1.70T.
Best, the preparation method of above-mentioned high-magnetic induction non-oriented electrical steel containing vanadium and titanium, processing step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, the temperature in the heating steps is 1130～1160 ℃; The start rolling temperature of finish rolling is 870～910 ℃ for 〉=1020 ℃, 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, described 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, cost is high, in order further to reduce equipment cost, described 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, therefore, the temperature out of concrete wherein low-temperature heat section is 750～820 ℃, the exit plate temperature of heat section is 890～920 ℃, 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 are subjected to the influence of naturally cooling, rolling speed, the use of ordinary hot tandem rolling unit for convenience, convenient control to the finish rolling start rolling temperature, be provided with de-scaling water device between described each passage of roughing step, roughing and the finish rolling, described finish rolling begins temperature and controls by 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 design having carried out engineering test of the present invention, producing the trade mark is the non-oriented electrical steel of 50PW800 in certain factory, and other technologies except that the processing parameter that has illustrated 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 except that second and four-pass the de-scaling water of other passages, one group of dephosphorization water is set between roughing and the finish rolling.Concrete chemical ingredients sees Table 1, processing parameter sees Table 2, electromagnetic performance sees 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 | 5.5 | 1.75 |
| 2 | 5.6 | 1.75 |
| 3 | 5.9 | 1.73 |
| 4 | 5.8 | 1.73 |
| 5 | 6.3 | 1.72 |
Claims (8)
1. high-magnetic induction non-oriented electrical steel containing vanadium and titanium is characterized in that: the weight percent of its chemical ingredients is that C 0.001～0.005%, Si 0.50～0.65%, Mn 0.15～0.35%, P≤0.025%, S≤0.008%, Als 0.25～0.35%, N≤0.007%, 0＜Ti≤0.01%, 0＜V≤0.01%, surplus are Fe and unavoidable impurities.
2. according to high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 1, it is characterized in that: described non-oriented electrical steel is that thickness is the steel band of 0.5mm.
3. according to high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 2, it is characterized in that: iron loss≤6.5W/kg.
4. according to high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 2, it is characterized in that: magnetic strength 〉=1.70T.
5. the preparation method of high-magnetic induction non-oriented electrical steel containing vanadium and titanium according to claim 1, processing step comprises heating, roughing, finish rolling, batches, cold rolling, annealing, it is characterized in that: the temperature in the heating steps is 1130～1160 ℃; The start rolling temperature of finish rolling is 870～910 ℃ for 〉=1020 ℃, finishing temperature, and the temperature of batching in the step is 〉=650 ℃.
6. the preparation method of high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 5 is characterized in that: the described cold rolling once cold rolling that is, cold rolling accumulative total draft is 75～80%.
7. the preparation method of high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 5, it is characterized in that: described 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 750～820 ℃, the exit plate temperature of heat section are 890～920 ℃, and the heat section time is 32～43s.
8. the preparation method of high-magnetic induction non-oriented electrical steel containing vanadium and titanium as claimed in claim 5, it is characterized in that: be provided with de-scaling water device between described each passage of roughing step, roughing and the finish rolling, described finish rolling begins temperature and controls by the de-scaling water unlatching group number between the unlatching of de-scaling water passage, roughing and the finish rolling of roughing step.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111270123A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Method for optimizing electromagnetic performance of non-oriented silicon steel and non-oriented silicon steel |
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| JP2000199034A (en) * | 1998-12-28 | 2000-07-18 | Kawasaki Steel Corp | High tensile strength hot rolled steel plate excellent in workability and its production |
| CN101168819A (en) * | 2007-12-05 | 2008-04-30 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN101466851A (en) * | 2006-06-16 | 2009-06-24 | 新日本制铁株式会社 | High intensity electromagnetic steel plate and method of manufacturing the same |
| CN101654729A (en) * | 2009-09-17 | 2010-02-24 | 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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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000199034A (en) * | 1998-12-28 | 2000-07-18 | Kawasaki Steel Corp | High tensile strength hot rolled steel plate excellent in workability and its production |
| CN101466851A (en) * | 2006-06-16 | 2009-06-24 | 新日本制铁株式会社 | High intensity electromagnetic steel plate and method of manufacturing the same |
| CN101168819A (en) * | 2007-12-05 | 2008-04-30 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN101654729A (en) * | 2009-09-17 | 2010-02-24 | 攀钢集团研究院有限公司 | Hot rolling method of cold-rolling low-carbon non-oriented electrical steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111270123A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Method for optimizing electromagnetic performance of non-oriented silicon steel and non-oriented silicon steel |
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