CN108504926B - New-energy automobile non-oriented electrical steel and its production method - Google Patents
New-energy automobile non-oriented electrical steel and its production method Download PDFInfo
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- CN108504926B CN108504926B CN201810310722.5A CN201810310722A CN108504926B CN 108504926 B CN108504926 B CN 108504926B CN 201810310722 A CN201810310722 A CN 201810310722A CN 108504926 B CN108504926 B CN 108504926B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The invention discloses a kind of new-energy automobile non-oriented electrical steel and its production methods, are related to non-oriented electrical steel and its production method.The present invention is the following steps are included: step A: smelting；Step B: continuous casting；Step C: heating；Step D: dephosphorization；Step E: roughing；Step F: it is sent into Coil Box processing；Step G: finish rolling；Step H: it batches；Step I: once cold rolling；Step J: intermediate annealing；Step K: secondary cold-rolling；Step L: final annealing.It is an object of the invention to overcome the shortcomings of that existing production technology is difficult to meet new-energy automobile non-oriented electrical steel requirement, a kind of new-energy automobile non-oriented electrical steel and its production method are provided, low iron loss under high frequency, high magnetic strength and the good ultra-thin non-oriented electrical steel of new-energy automobile of surface quality are able to produce out.
Description
Technical field
The present invention relates to non-oriented electrical steel and its production methods, more specifically to a kind of new-energy automobile nothing
Oriented electrical steel and its production method.
Background technique
Non-oriented electrical steel is carbon containing very low silicon-iron soft magnetic alloy, is indispensable in electric power, electronics and war industry
Important materials.Non-oriented electrical steel is the motor to work in rotating excitation field and the core material of generator amature, it is desirable that
With good magnetic property and processing performance.In recent years, right with the new-energy automobile development of motor high speed and miniaturization
More stringent requirements are proposed for the performance of non-oriented electrical steel, such as has low iron loss and high magnetic induction in high frequency.
Basic demand of electronic (the EV)/hybrid vehicle (HEV) of new-energy automobile-to electrical sheet: (1) it in automobile sends out
High torque is needed when dynamic acceleration, it is desirable that electric steel plate there should be high magnetic induction；(2) it under motor high-speed rotation, accounts for
It is iron loss that ratio is maximum in motor loss, and therefore, being specially required to high-speed motor with non-oriented electrical steel has low high frequency
Iron loss, and reducing eddy-current loss most efficient method is plate thickness to be thinned, therefore the motor in new-energy automobile is all using ultra-thin
The high high-efficiency non-oriented electrical sheet of the trade mark.
The patent applications such as patent publication No. CN 103882293A, CN 1611616A and CN 1888111A are all made of various
The exploitation of technique progress non-oriented electrical steel, but disadvantage is that: (1) most finished product thicknesses are 0.5mm, and
Cold rolling reduction ratio is all larger than 70%, and when cold rolling reduction ratio further increases, and when especially greater than 80%, (111) texture is quick
Increasing, (100) texture is suppressed, and it is totally unfavorable to magnetic strength, it is unable to satisfy the high magnetic strength requirement of new-energy automobile non-orientation silicon steel；
(2) Calcium treatment is used in the technical solution of part of the patent application, although Calcium treatment can modify field trash, cannot significantly reduced
The amount of inclusions；(3) hot-rolled process hot rolled coil need to be batched in 700 DEG C or more high temperature, cause hot rolled coil scale on surface
Densification increases burden when pickling；(4) silicone content is lower in the technical solution of part of the patent application, belong in the low trade mark, iron
Damage is higher, is unable to satisfy the low iron loss requirement of new-energy automobile non-orientation silicon steel；(5) its magnetic core loss value under the conditions of high-frequency
It is unable to satisfy the requirement of new-energy automobile.
In conclusion to reach the requirement of low iron loss under new-energy automobile non-oriented electrical steel high frequency, it is necessary to using high
Grade silicon steel, but silicone content is improved, and will lead to the generation of surface corrugations shape defect；And under thickness ultrathin inevitable requirement cold rolling
Rate increases, unfavorable to magnetic strength so as to cause the increase of (111) plane texture.Therefore, how to produce low iron loss under high frequency, high magnetic strength and
The ultra-thin non-oriented electrical steel of the good new-energy automobile of surface quality, be in the prior art urgent need to resolve the technical issues of.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome existing production technology to be difficult to meet new-energy automobile to be used with non-oriented electrical steel
It is required that deficiency, provide a kind of new-energy automobile non-oriented electrical steel and its production method, be able to produce out under high frequency
Low iron loss, high magnetic strength and the good ultra-thin non-oriented electrical steel of new-energy automobile of surface quality.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
New-energy automobile non-oriented electrical steel of the invention, chemical component mass percent are as follows:
Si:3.0~4.0%, Al:1.0~2.0%, [Si+Al] >=4.5%, Mn:1.0~2.0%, S≤30ppm, O≤
30ppm, C≤20ppm, N≤20ppm, Ti≤30ppm, [S+O+C+N+Ti]≤80ppm, [Sn or Sb or Sn+Sb]: 0.01~
0.1%, rare earth element: 0.001~0.1%, surplus is Fe and other impurities element.
The production method of new-energy automobile non-oriented electrical steel of the invention, comprising the following steps:
Step A: it smelts；
Step B: continuous casting；
Step C: heating；
Step D: dephosphorization；
Step E: roughing；
Step F: it is sent into Coil Box processing；
Step G: finish rolling；
Step H: it batches；
Step I: once cold rolling；
Step J: intermediate annealing；
Step K: secondary cold-rolling；
Step L: final annealing.
As further improvement of the present invention, in step A smelting process, then progress converter smelting first carries out RH
Refining treatment, molten steel terminal chemical component mass percent after processing are as follows:
Si:3.0~4.0%, Al:1.0~2.0%, [Si+Al] >=4.5%, Mn:1.0~2.0%, S≤30ppm, O≤
30ppm, C≤20ppm, N≤20ppm, Ti≤30ppm, [S+O+C+N+Ti]≤80ppm, [Sn or Sb or Sn+Sb]: 0.01~
0.1%, rare earth element: 0.001~0.1%, surplus is Fe and other impurities element；
The rare earth element is added in 1~2 minute after RH refined alloy, is carried out after the rare earth element is added
Stirring, mixing time >=3 minute；The rare earth element is any one in La, Ce, Nd or any two kinds of mixing or three kinds
Mixing.
As further improvement of the present invention, in step B continuous casting process, when controlling continuous casting pulling rate be 0.6~2.0 meter/
Minute, the slab that continuous casting obtains with a thickness of 200~300mm；Step B continuous casting process uses electromagnetic agitation, and controls tundish
The degree of superheat (- 5~0) DEG C guarantees equiaxial crystal ratio >=90%.
As further improvement of the present invention, in step C heating process, using hot-loading and hot-conveying, slab is into furnace temperature ﹥
650 DEG C, 950~1150 DEG C of heating temperature, heating time >=3 hour；In step E rough rolling process, start rolling temperature 950~1100
DEG C, obtain the intermediate base with a thickness of 20~30mm, wherein control roughing total reduction >=90%.
As further improvement of the present invention, step F is sent into Coil Box treatment process, and intermediate base exchanges end to end.
As further improvement of the present invention, in step G finishing stands, 950~1050 DEG C of start rolling temperature, finishing temperature
880~920 DEG C, obtain the hot rolled plate with a thickness of 0.8~1.0mm；In step H coiling process, oiler temperature control be 600~
700℃；During step I once cold rolling, once cold rolling is to a thickness of 0.40~0.50mm；During step J intermediate annealing, control
Intermediate anneal temperature processed is 800~900 DEG C, soaking time 2~5 minutes；During step K secondary cold-rolling, secondary cold-rolling to thickness
Degree is 0.20~0.25mm；During step L final annealing, control final annealing temperature is 950~1200 DEG C, soaking time 2
~5 minutes.
As further improvement of the present invention, step G finishing stands control finish rolling reduction ratio >=95%；Step I is primary
Process control of cold rolling reduction ratio 50~60%；Step K secondary cold-rolling process control reduction ratio 50~60%.
As further improvement of the present invention, step I once cold rolling process, step K secondary cold-rolling process are all made of cold
Tandem rolling.
As further improvement of the present invention, step J intermediate annealing process, step L final annealing process are all made of company
Continuous annealing furnace, heat-treating atmosphere are 100% hydrogen.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) production method of new-energy automobile non-oriented electrical steel of the invention, each technique of step A to step L
Parameter cooperates, and is able to produce out low iron loss under high frequency, high magnetic strength and the good new-energy automobile of surface quality and is taken with ultra-thin nothing
To electrical sheet.
(2) production method of new-energy automobile non-oriented electrical steel of the invention, wherein step A smelt when, molten steel at
Set up raising manganese content in meter separately, magnetic strength can be improved in addition Sn, Sb；Increase rare earth element can deep purifying molten steel, guarantee it is ultra-pure
Net molten steel controls the amount of inclusions, improves magnetic strength；It designs in molten steel [Si+Al] >=4.5%, 0.20~0.25mm of finished product thickness,
Guarantee to obtain low iron loss under high frequency；Step B continuous casting process is poured using electromagnetic agitation+negative degree of superheat, and guarantee equiaxial crystal ratio >=
90%, reduce the high temperature coiling and normalizing process in traditional handicraft, eliminates surface corrugations defect；Cold-rolled process uses in secondary
Equal reduction ratios control, obtains preferential orientation texture, improves magnetic strength；Step F is sent into Coil Box treatment process, and intermediate base is mutual end to end
It changes, so that intermediate base temperature is uniform, to guarantee the stability of finished product magnetic property；1~2 minute after RH refined alloy
Interior addition rare earth element is stirred, mixing time >=3 minute after rare earth element is added, and guarantees inclusion floating；Once cold rolling
And secondary cold-rolling is all made of cold continuous rolling, can significantly improve yield；The above designing points collective effect, to obtain low iron under high frequency
The good ultra-thin non-orientation silicon steel of new-energy automobile of damage, high magnetic strength, surface quality.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the flow chart of the production method of new-energy automobile non-oriented electrical steel of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Therefore, below to the embodiment of the present invention provided in the accompanying drawings
Detailed description be not intended to limit the range of claimed invention, but be merely representative of selected embodiment of the invention.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
With reference to Fig. 1, the production method of new-energy automobile non-oriented electrical steel of the invention, comprising the following steps:
Step A: it smelts；
In step A smelting process, converter smelting is carried out first, then carries out RH refining treatment, molten steel terminal after processing
Learn ingredient percent are as follows:
Si:3.0~4.0%, Al:1.0~2.0%, [Si+Al] >=4.5%, Mn:1.0~2.0%, S≤30ppm, O≤
30ppm, C≤20ppm, N≤20ppm, Ti≤30ppm, [S+O+C+N+Ti]≤80ppm, [Sn or Sb or Sn+Sb]: 0.01~
0.1%, rare earth element: 0.001~0.1%, surplus is Fe and other impurities element；
Rare earth element is added in 1~2 minute after RH refined alloy, is stirred, stirs after rare earth element is added
It mixes the time >=3 minutes；The above rare earth element is any one in La, Ce, Nd or any two kinds of mixing or three kinds of mixing.
Step B: continuous casting；
In step B continuous casting process, pulling rate is 0.6~2.0 m/min when controlling continuous casting, continuous casting obtains with a thickness of 200~
The slab of 300mm；Step B continuous casting process uses electromagnetic agitation, and controls the tundish degree of superheat (- 5~0) DEG C, guarantees isometric
Brilliant rate >=90%；
Step C: heating；
In step C heating process, using hot-loading and hot-conveying, slab into 650 DEG C of furnace temperature ﹥, 950~1150 DEG C of heating temperature,
Heating time >=3 hour；
Step D: dephosphorization；
Step E: roughing；
In step E rough rolling process, 950~1100 DEG C of start rolling temperature, the intermediate base with a thickness of 20~30mm is obtained, wherein
Control roughing total reduction >=90%；
Step F: it is sent into Coil Box processing；
Step F is sent into Coil Box treatment process, and intermediate base exchanges end to end；It is quasi- after i.e. intermediate base is handled in Coil Box
Before entering finishing rolling step, intermediate base is exchanged end to end；
Step G: finish rolling；
In step G finishing stands, 950~1050 DEG C of start rolling temperature, 880~920 DEG C of finishing temperature, obtain with a thickness of 0.8
The hot rolled plate of~1.0mm；Control finish rolling reduction ratio >=95%；
Step H: it batches；
In step H coiling process, oiler temperature control is 600~700 DEG C；
Step I: once cold rolling；
During step I once cold rolling, using cold continuous rolling, once cold rolling is to a thickness of 0.40~0.50mm；Control pressure
Rate 50~60%；
Step J: intermediate annealing；
During step J intermediate annealing, control intermediate anneal temperature is 800~900 DEG C, soaking time 2~5 minutes；It adopts
With continuous annealing furnace, heat-treating atmosphere is 100% hydrogen；
Step K: secondary cold-rolling；
During step K secondary cold-rolling, using cold continuous rolling, secondary cold-rolling is to a thickness of 0.20~0.25mm；Control pressure
Rate 50~60%；
Step L: final annealing；
During step L final annealing, control final annealing temperature is 950~1200 DEG C, soaking time 2~5 minutes；It adopts
With continuous annealing furnace, heat-treating atmosphere is 100% hydrogen.
Reach the requirement of low iron loss under new-energy automobile non-oriented electrical steel high frequency, it is necessary to high grade silicon steel is used,
But silicone content is improved, and will lead to the generation of surface corrugations shape defect；And thickness ultrathin inevitable requirement cold rolling reduction ratio increases, from
And (111) plane texture is caused to increase, it is unfavorable to magnetic strength.In view of the above problems, new-energy automobile of the invention is with No yield point electrician
Each technological parameter of the production method of steel, step A to step L cooperates, and is able to produce out low iron loss under high frequency, high magnetic strength
And the ultra-thin non-oriented electrical steel of new-energy automobile that surface quality is good.
The production method of new-energy automobile non-oriented electrical steel of the invention, wherein when step A smelts, molten steel composition
Manganese content is improved in design, magnetic strength can be improved in addition Sn, Sb；Increase rare earth element can deep purifying molten steel, guarantee superelevation it is pure
Molten steel controls the amount of inclusions, improves magnetic strength；It designs in molten steel [Si+Al] >=4.5%, 0.20~0.25mm of finished product thickness is protected
Low iron loss is obtained under card high frequency；Step B continuous casting process is poured using electromagnetic agitation+negative degree of superheat, and guarantee equiaxial crystal ratio >=
90%, reduce the high temperature coiling and normalizing process in traditional handicraft, eliminates surface corrugations defect；Cold-rolled process uses in secondary
Equal reduction ratios control, obtains preferential orientation texture, improves magnetic strength；Step F is sent into Coil Box treatment process, and intermediate base is mutual end to end
It changes, so that intermediate base temperature is uniform, to guarantee the stability of finished product magnetic property；1~2 minute after RH refined alloy
Interior addition rare earth element is stirred, mixing time >=3 minute after rare earth element is added, and guarantees inclusion floating；Once cold rolling
And secondary cold-rolling is all made of cold continuous rolling, can significantly improve yield；The above designing points collective effect, to obtain low iron under high frequency
The good ultra-thin non-orientation silicon steel of new-energy automobile of damage, high magnetic strength, surface quality.
To further appreciate that the contents of the present invention, the present invention is described in detail in conjunction with the embodiments.
Embodiment 1
The production method of the new-energy automobile non-oriented electrical steel of the present embodiment, comprising the following steps:
Step A: it smelts；
In step A smelting process, converter smelting is carried out first, then carries out RH refining treatment, molten steel terminal after processing
Learn ingredient percent are as follows:
Si:3.0%, Al:2.0%, Mn:2.0%, S:15ppm, O:20ppm, C:10ppm, N:17ppm, Ti:8ppm, [S
+ O+C+N+Ti]≤80ppm, [Sn+Sb]: 0.03%, [La+Ce+Nd]: 0.002%, surplus is Fe and other impurities element；
It is added rare earth element after 1 minute after RH refined alloy, is stirred after rare earth element is added, when stirring
Between 3.5 minutes；
Step B: continuous casting；
In step B continuous casting process, pulling rate is 0.6 m/min when controlling continuous casting, the slab that continuous casting obtains with a thickness of 220mm；
Step B continuous casting process uses electromagnetic agitation, and controls -2 DEG C of the tundish degree of superheat, equiaxial crystal ratio 95%；
Step C: heating；
In step C heating process, using hot-loading and hot-conveying, slab is into 680 DEG C of furnace temperature, 1080 DEG C of heating temperature, when heating
Between 3.5 hours；
Step D: dephosphorization；
Step E: roughing；
In step E rough rolling process, 1050 DEG C of start rolling temperature, the intermediate base with a thickness of 20mm is obtained, wherein under roughing stagnation pressure
Rate 90.91%；
Step F: it is sent into Coil Box processing；
Step F is sent into Coil Box treatment process, and intermediate base exchanges end to end；
Step G: finish rolling；
In step G finishing stands, 1000 DEG C of start rolling temperature, 880 DEG C of finishing temperature, the hot rolling with a thickness of 0.80mm is obtained
Plate；Control finish rolling reduction ratio 96%；
Step H: it batches；
In step H coiling process, oiler temperature control is 600 DEG C；
Step I: once cold rolling；
During step I once cold rolling, using cold continuous rolling, once cold rolling is to a thickness of 0.40mm；Control reduction ratio 50%；
Step J: intermediate annealing；
During step J intermediate annealing, control intermediate anneal temperature is 800 DEG C, soaking time 3 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen；
Step K: secondary cold-rolling；
During step K secondary cold-rolling, using cold continuous rolling, secondary cold-rolling is to a thickness of 0.20mm；Control reduction ratio 50%；
Step L: final annealing；
During step L final annealing, control final annealing temperature is 1000 DEG C, soaking time 2 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen.
Embodiment 2
The production method of the new-energy automobile non-oriented electrical steel of the present embodiment, comprising the following steps:
Step A: it smelts；
In step A smelting process, converter smelting is carried out first, then carries out RH refining treatment, molten steel terminal after processing
Learn ingredient percent are as follows:
Si:3.5%, Al:1.5%, Mn:1.5%, S:12ppm, O:15ppm, C:10ppm, N:15ppm, Ti:5ppm,
Sn:0.05%, La:0.005%, surplus are Fe and other impurities element；
It is added rare earth element when 2 minutes after RH refined alloy, is stirred after rare earth element is added, when stirring
Between 3 minutes；
Step B: continuous casting；
In step B continuous casting process, pulling rate is 1.0 ms/min when controlling continuous casting, the slab that continuous casting obtains with a thickness of 250mm；
Step B continuous casting process uses electromagnetic agitation, and controls -5 DEG C of the tundish degree of superheat, equiaxial crystal ratio 92%；
Step C: heating；
In step C heating process, using hot-loading and hot-conveying, slab is into 750 DEG C of furnace temperature, 1150 DEG C of heating temperature, when heating
Between 3 hours；
Step D: dephosphorization；
Step E: roughing；
In step E rough rolling process, 1100 DEG C of start rolling temperature, the intermediate base with a thickness of 25mm is obtained, wherein control roughing is total
Reduction ratio 90%；
Step F: it is sent into Coil Box processing；
Step F is sent into Coil Box treatment process, and intermediate base exchanges end to end；
Step G: finish rolling；
In step G finishing stands, 1050 DEG C of start rolling temperature, 920 DEG C of finishing temperature, the hot rolling with a thickness of 0.90mm is obtained
Plate；Control finish rolling reduction ratio 96.4%；
Step H: it batches；
In step H coiling process, oiler temperature control is 650 DEG C；
Step I: once cold rolling；
During step I once cold rolling, using cold continuous rolling, once cold rolling is to a thickness of 0.45mm；Control reduction ratio 50%；
Step J: intermediate annealing；
During step J intermediate annealing, control intermediate anneal temperature is 850 DEG C, soaking time 4 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen；
Step K: secondary cold-rolling；
During step K secondary cold-rolling, using cold continuous rolling, secondary cold-rolling is to a thickness of 0.20mm；Control reduction ratio
55.56%；
Step L: final annealing；
During step L final annealing, control final annealing temperature is 1150 DEG C, soaking time 4 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen.
Embodiment 3
The production method of the new-energy automobile non-oriented electrical steel of the present embodiment, comprising the following steps:
Step A: it smelts；
In step A smelting process, converter smelting is carried out first, then carries out RH refining treatment, molten steel terminal after processing
Learn ingredient percent are as follows:
Si:4.0%, Al:1.0%, Mn:1.0%, S:18ppm, O:12ppm, C:10ppm, N:15ppm, Ti:5ppm,
Sb:0.1%, [La+Ce]: 0.1%, surplus is Fe and other impurities element；
It is added rare earth element when 2 minutes after RH refined alloy, is stirred after rare earth element is added, when stirring
Between 4 minutes；
Step B: continuous casting；
In step B continuous casting process, pulling rate is 2.0 ms/min when controlling continuous casting, the slab that continuous casting obtains with a thickness of 300mm；
Step B continuous casting process uses electromagnetic agitation, and controls -5 DEG C of the tundish degree of superheat, guarantees equiaxial crystal ratio 90%；
Step C: heating；
In step C heating process, using hot-loading and hot-conveying, slab is into 700 DEG C of furnace temperature, 1150 DEG C of heating temperature, when heating
Between 4 hours；
Step D: dephosphorization；
Step E: roughing；
In step E rough rolling process, 1100 DEG C of start rolling temperature, the intermediate base with a thickness of 30mm is obtained, wherein control roughing is total
Reduction ratio 90%；
Step F: it is sent into Coil Box processing；
Step F is sent into Coil Box treatment process, and intermediate base exchanges end to end；
Step G: finish rolling；
In step G finishing stands, 1050 DEG C of start rolling temperature, 920 DEG C of finishing temperature, the hot rolled plate with a thickness of 1.0mm is obtained；
Control finish rolling reduction ratio 96.67%；
Step H: it batches；
In step H coiling process, oiler temperature control is 700 DEG C；
Step I: once cold rolling；
During step I once cold rolling, using cold continuous rolling, once cold rolling is to a thickness of 0.50mm；Control reduction ratio 50%；
Step J: intermediate annealing；
During step J intermediate annealing, control intermediate anneal temperature is 900 DEG C, soaking time 5 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen；
Step K: secondary cold-rolling；
During step K secondary cold-rolling, using cold continuous rolling, secondary cold-rolling is to a thickness of 0.25mm；Control reduction ratio 50%；
Step L: final annealing；
During step L final annealing, control final annealing temperature is 1200 DEG C, soaking time 5 minutes；Using continuously moving back
Stove, heat-treating atmosphere are 100% hydrogen.
The magnetic property for the non-oriented electrical steel that specific embodiment 1-3 is produced is shown in that table 1 below, embodiment 1-3 are produced
Non-oriented electrical steel finished surface without corrugation defect, surface quality is good.
1 magnetic property of table
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (2)
1. the production method of new-energy automobile non-oriented electrical steel, it is characterised in that the following steps are included:
Step A: it smelts；
In step A smelting process, first progress converter smelting, then carry out RH refining treatment, after processing molten steel terminal chemistry at
Divide mass percent are as follows:
Si:3.0~4.0%, Al:1.0~2.0%, [Si+Al] >=4.5%, Mn:1.0~2.0%, S≤30ppm, O≤
30ppm, C≤20ppm, N≤20ppm, Ti≤30ppm, [S+O+C+N+Ti]≤80ppm, [Sn or Sb or Sn+Sb]: 0.01~
0.1%, rare earth element: 0.001~0.1%, surplus is Fe and other impurities element；
The rare earth element is added in 1~2 minute after RH refined alloy, is stirred after the rare earth element is added
It mixes, mixing time >=3 minute；The rare earth element is the mixed of any one or any two kinds of mixing or three kinds in La, Ce, Nd
It closes；
Step B: continuous casting；
In step B continuous casting process, pulling rate is 0.6~2.0 m/min when controlling continuous casting, and continuous casting obtains with a thickness of 200~300mm
Slab；Step B continuous casting process uses electromagnetic agitation, and controls the tundish degree of superheat (- 5~0) DEG C, and guarantee equiaxial crystal ratio >=
90%；
Step C: heating；
In step C heating process, using hot-loading and hot-conveying, slab is into 650 DEG C of furnace temperature ﹥, 950~1150 DEG C of heating temperature, heating
Time >=3 hour；
Step D: dephosphorization；
Step E: roughing；
In step E rough rolling process, 950~1100 DEG C of start rolling temperature, the intermediate base with a thickness of 20~30mm is obtained, wherein control
Roughing total reduction >=90%；
Step F: it is sent into Coil Box processing；
Step F is sent into Coil Box treatment process, and intermediate base exchanges end to end；
Step G: finish rolling；
In step G finishing stands, 950~1050 DEG C of start rolling temperature, 880~920 DEG C of finishing temperature, obtain with a thickness of 0.8~
The hot rolled plate of 1.0mm；
Step G finishing stands control finish rolling reduction ratio >=95%；
Step H: it batches；
In step H coiling process, oiler temperature control is 600~700 DEG C；
Step I: once cold rolling；
During step I once cold rolling, once cold rolling is to a thickness of 0.40~0.50mm；
Step I once cold rolling process control reduction ratio 50~60%；
Step I once cold rolling process uses cold continuous rolling；
Step J: intermediate annealing；
During step J intermediate annealing, control intermediate anneal temperature is 800~900 DEG C, soaking time 2~5 minutes；
Step K: secondary cold-rolling；
During step K secondary cold-rolling, secondary cold-rolling is to a thickness of 0.20~0.25mm；
Step K secondary cold-rolling process control reduction ratio 50~60%；
Step K secondary cold-rolling process uses cold continuous rolling；
Step L: final annealing；
During step L final annealing, control final annealing temperature is 950~1200 DEG C, soaking time 2~5 minutes.
2. the production method of new-energy automobile non-oriented electrical steel according to claim 1, it is characterised in that: step J
Intermediate annealing process, step L final annealing process are all made of continuous annealing furnace, and heat-treating atmosphere is 100% hydrogen.
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| CN113969371B (en) * | 2020-07-24 | 2022-09-20 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate for simultaneously cutting stator and rotor iron core and manufacturing method thereof |
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