CN103572158A - Non-oriented electrical steel plate and production method thereof - Google Patents
Non-oriented electrical steel plate and production method thereof Download PDFInfo
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Abstract
The invention relates to a non-oriented electrical steel plate Which comprises the following components in percentage by mass: less than or equal to 0.0060 percent of C, 0.60 to 0.80 percent of Si, 0.20 to 0.40 percent of Mn, less than or equal to 0.10 percent of P, less than or equal to 0.0080 percent of S, 0.015 to 0.025 percent of Als, 0.001 to 0.002 percent of B, and the balance of Fe and unavoidable impurity elements. The production method comprises the following steps of smelting in a converter, argon blowing to steel ladle, RH vacuum treatment, refining of an LF furnace, continuous casting of a sheet billet, heat equalizing through a tunnel, fine rolling, cooling, coiling, acid pickling, cold rolling and continuous annealing. Compared with the prior art, the method is high in magnetic induction and low in iron loss. A manufacturing process for producing the non-oriented electrical steel plate by continuously casting and continuously rolling the sheet billet is provided for the first time, and the technical support is provided for production of a novel non-oriented electrical steel hot-rolling raw material with excellent environmental-protection performance by utilizing a sheet billet continuous-casting and continuous rolling production line.
Description
Technical field
Present method relates to a kind of electrical sheet and production method thereof, a kind of method that relates in particular to non-oriented electromagnetic steel sheet and adopt continuous casting and rolling technique of sheet bar to produce this electrical sheet.
Background technology
The continuous casting and rolling technique of sheet bar of manufacturing one of novel process as Iron And Steel Industry strip series products, is at home and abroad developed rapidly in recent years.But due to equipment configuration and the reason such as technique is immature, sheet billet continuous casting and rolling production line there is no the precedent of production the type electrical steel, and the electrical sheet of the type of mass market urgent need cannot be provided.
Summary of the invention
The object of present method is to overcome above-mentioned the deficiencies in the prior art, a kind of non-oriented electrical steel is provided and proposes a kind of method of using continuous casting and rolling technique of sheet bar to produce this steel plate.
The technical scheme of present method is:
, its composition quality per-cent is: C≤0.0060%, Si0.60～0.80%, Mn0.20～0.40%, P≤0.10%, S≤0.0080%, Als0.015～0.025%, B0.001～0.002%, all the other are Fe and inevitable impurity element.
A production method for non-oriented electromagnetic steel sheet, it comprises the steps:
Step 1: converter smelting, becomes molten steel by molten iron smelting, output molten steel;
Step 2: concise through ladle argon-blown, RH vacuum-treat and LF stove, adjust molten steel chemical composition, output meets the molten steel that chemical composition requires;
Step 3: sheet blank continuous casting, in casting process, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line 15-30 ℃, and casting process adopts sinusoidal mold oscillation curve, and molten steel casting is become to thin slab, output 50～90mm thin thickness slab;
Step 4: tunnel soaking, continuous tunnel furnace temperature is 1150 ± 20 ℃ of soaking, homogenizing thin slab temperature, the thin slab that output temperature evenly meets the demands;
Step 5: finish rolling, rolled piece enters the tandem rolling unit being comprised of seven finishing mills and is rolled, and rolled piece start rolling temperature is 1070 ± 30 ℃, and finishing temperature is 860～900 ℃, and thin slab is rolled into the hot rolled strip that thickness is 2.0～3.5mm;
Step 6: cooling, the band steel complete to rolling carries out cooling, adopt between cooling between frame, first finishing mill and second finishing mill and carry out secondary descaling steel between second finishing mill and the 3rd finishing mill, it is cooling that back segment is cooled to laminar flow, expanded the effective contact of water coolant with sheet material;
Step 7: batch, coiling temperature is 660～700 ℃, and strip coiling is become to coil of strip, output coil of strip;
Step 8: pickling and cold-rolling, carries out Pickling Descaling and cold rolling by coils of hot-rolled steel, the cold-rolled steel coils that output thickness is 0.5mm;
Step 9: continuous annealing is produced, anneals cold-rolled steel coils, the coil of strip after output annealing.
260-300 time/min of sinusoidal mold oscillation curve vibrational frequency in described step 3, amplitude 6-7mm, pulling speed of continuous casting is controlled at 3.0-4.5m/min.
Crystallizer protecting residue in described step 3 is MBG-1 type electrical steel mould flux.
First finishing mill and second relative draft 40-65% of finishing mill in described step 5, the 3rd finishing mill, the 4th finishing mill and the 5th the relative draft 30～45% of finish rolling, the 6th the relative draft 15-35% of finishing mill, the 7th relative draft≤20% of finishing mill.
Present method has following positively effect: it is strong that the mould flux capacity of heat transmission in present method is strong, few to the carburetting of molten steel, absorption is mingled with ability.The high magnetic strength of present method non-oriented electromagnetic steel sheet, low iron loss, compared with prior art, present method has proposed a kind of manufacturing process of CSP production the type non-oriented electromagnetic steel sheet first, for CSP line, produce the good non-oriented electrical steel hot rolling of novel environmental-protecting performance raw material technical guarantee is provided, also further expanded CSP(Compact Strip Production simultaneously, CSP is produced) handicraft product manufacture scope, and produce by follow-up pickling and cold-rolling and continuous annealing, provide the type non-oriented electrical steel product in downstream user motor manufacturing in batches.
Embodiment
, its composition quality per-cent is: C≤0.0060%, Si0.60～0.80%, Mn0.20～0.40%, P≤0.10%, S≤0.0080%, Als0.015～0.025%, B0.001～0.002%, all the other are Fe and inevitable impurity element.Its production method is:
Step 1: converter smelting, use 120 tons of converters, molten iron smelting is become to molten steel, output molten steel, reduces impurity contained in metal or increases certain composition in metal, is smelt needed metal ingredient.
Step 2: concise through ladle argon-blown, RH vacuum-treat and LF stove, ladle argon-blown enters argon gas by bag bottom blowing and stirs molten steel, can remove hydrogen richness and nitrogen content in molten steel, and further reduce oxygen level and sulphur content, finally obtain compared with the material of the molten steel of high cleanliness and superior performance; The gas in steel is removed in RH vacuum-treat (molten steel vacuum circulation degassing method), thereby improves mechanical property and the processing characteristics of steel; By a series of processing, adjust molten steel chemical composition, output meets the molten steel that chemical composition requires.
Step 3: sheet blank continuous casting, in casting process, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line 15-30 ℃, and casting process adopts sinusoidal mold oscillation curve, and this step becomes thin slab by molten steel casting, output 50～90mm thin thickness slab, reduces follow-up rolling cost.
Step 4: tunnel soaking, continuous tunnel furnace temperature is 1150 ± 20 ℃ of soaking, this step homogenizing thin slab temperature, the thin slab that output temperature evenly meets the demands, reduces the required energy consumption of heating of plate blank.
Step 5: 7 frame finish rolling, rolled piece enters the tandem rolling unit being comprised of seven finishing mills and is rolled, seven finishing mills of seven finishing mills of first finishing mill to the are respectively F1, F2, F3, F4, F5, F6, F7, rolled piece start rolling temperature is 1070 ± 30 ℃, finishing temperature is 860～900 ℃, first finishing mill and second relative draft 40-65% of finishing mill, the 3rd finishing mill, the 4th finishing mill and the 5th the relative draft 30～45% of finish rolling, the 6th the relative draft 15-35% of finishing mill, the 7th relative draft≤20% of finishing mill, this step is rolled into by thin slab the hot rolled strip that thickness is 2.0～3.5mm.
Step 6: cooling, the band steel complete to rolling carries out cooling; The secondary descaling steel that adopts cooling between frame, F1～F2 and F2～F3, it is cooling that back segment is cooled to laminar flow; The water of the cooling middle laminar flow regime of laminar flow drops to surface of steel plate meeting reposefully to surrounding diffluence from certain altitude, thereby has expanded the effective contact of water coolant with sheet material, has greatly improved cooling efficiency.Wherein F1～F2 represents between first finishing mill and second finishing mill, and F2～F3 represents between second finishing mill and the 3rd finishing mill.
Step 7: reeling machine, coiling temperature is 660～700, this step becomes coil of strip by strip coiling, output coil of strip.
Step 8: pickling and cold-rolling, carries out Pickling Descaling and cold rolling by coils of hot-rolled steel, the cold-rolled steel coils that output thickness is 0.5mm.
Step 9: continuous annealing is produced, anneals cold-rolled steel coils, the coil of strip after output annealing.Provide the type non-oriented electrical steel product in downstream user motor manufacturing in batches.
Wherein start rolling temperature is that milling train starts metal rolled temperature, and finishing temperature is the temperature that hot-rolled sheet leaves last one finishing mill, temperature when coiling temperature is strip arrival reeling machine.
Be specially a kind of production method of non-oriented electromagnetic steel sheet, described electrical sheet is produced with CSP continuous casting and rolling technique of sheet bar.In described casting process, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line+15-30 ℃, casting process adopts sinusoidal mold oscillation curve, 260-300 time/min of described sinusoidal mold oscillation curve vibrational frequency, amplitude 6-7mm, pulling speed of continuous casting is controlled at 3.0-4.5m/min; This value is of value to the thin slab base shell that forms in crystallizer from coming off with the contact surface of crystallizer.Crystallizer protecting residue is MBG-1 type electrical steel mould flux (manufacturer: the new steel refractory Company in Xinyu, Jiangsu), it is strong that this mould flux capacity of heat transmission is strong, few to the carburetting of molten steel, absorption is mingled with ability.Described continuous rolling process system is: a, temperature schedule are: 1150 ± 20 ℃ of soaking of continuous tunnel furnace, 1070 ± 30 ℃ of start rolling temperatures, 860～900 ℃ of finishing temperatures, 660～700 ℃ of coiling temperatures, b, reduction system are: the relative draft 40-65% of front 2 frame, the relative draft 30～45% of 3rd～5 frame, the relative draft 15-35% of the 6th frame, relative draft≤20% of the 7th frame, c, adopts the secondary descaling steel of cooling between frame, F1～F2 and F2～F3, and it is cooling that back segment is cooled to laminar flow.De-scaling for the first time before finish rolling, before first milling train is F1, i.e. F1 entrance.
The high magnetic strength of present method non-oriented electromagnetic steel sheet, low iron loss, compared with prior art, present method has proposed a kind of manufacturing process of CSP production the type non-oriented electromagnetic steel sheet first, for CSP line, produce the good non-oriented electrical steel hot rolling of novel environmental-protecting performance raw material technical guarantee is provided, also further expanded CSP handicraft product and manufactured scope simultaneously, and produce by follow-up pickling and cold-rolling and continuous annealing, provide the type non-oriented electrical steel product in downstream user motor manufacturing in batches.The present invention has reduced energy consumption and the production cost in production process.
Embodiment 1
The chemical composition of present method non-oriented electromagnetic steel sheet is in Table 1, production method CSP explained hereafter.First through 120 tons of converter smeltings, concise through ladle argon-blown, RH vacuum-treat and LF stove, be met the qualified molten steel that chemical composition requires, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line+15 ℃, casting process adopts sinusoidal mold oscillation curve, 270 times/min of described sinusoidal mold oscillation curve vibrational frequency, and amplitude 6.4mm, pulling speed of continuous casting is controlled at 4.2m/min, and crystallizer protecting residue is MBG-1 type electrical steel mould flux, produce the thin slab that thickness is 70mm, after continuous tunnel furnace soaking, enter 7 frame tandem mill group rollings, rolling technology system is: a, temperature schedule is: 1140 ℃ of soaking of continuous tunnel furnace, 1050 ℃ of start rolling temperatures, 870 ℃ of finishing temperatures, 670 ℃ of coiling temperatures, b, reduction system is: the relative draft 45% of front 2 frame, the relative draft 35% of 3rd～5 frame, the relative draft 15% of the 6th frame, the relative draft 10% of the 7th frame, c, adopt between frame cooling, the secondary descaling steel of F1～F2 and F2～F3, it is cooling that back segment is cooled to laminar flow, produce the hot rolled coil of hot rolling thickness specification 2.2mm.Hot rolled coil becomes the chill volume of 0.5mm through single-stand cold-rolling machine rolling, enter follow-up continuous annealing+painting insulation layer production line, and annealing temperature is 820 ℃, produces the type non-oriented electrical steel finished steel coils.
Embodiment 2
The chemical composition of present method non-oriented electromagnetic steel sheet is in Table 1, production method CSP explained hereafter.First through 120 tons of converter smeltings, concise through ladle argon-blown, RH vacuum-treat and LF stove, be met the qualified molten steel that chemical composition requires, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line+28 ℃, casting process adopts sinusoidal mold oscillation curve, 300 times/min of described sinusoidal mold oscillation curve vibrational frequency, and amplitude 6.8mm, pulling speed of continuous casting is controlled at 3.3m/min, and crystallizer protecting residue is MBG-1 type electrical steel mould flux, produce the thin slab that thickness is 70mm, after continuous tunnel furnace soaking, enter 7 frame tandem mill group rollings, rolling technology system is: a, temperature schedule is: 1170 ℃ of soaking of continuous tunnel furnace, 1090 ℃ of start rolling temperatures, 890 ℃ of finishing temperatures, 690 ℃ of coiling temperatures, b, reduction system is: the relative draft 60% of front 2 frame, the relative draft 40% of 3rd～5 frame, the relative draft 30% of the 6th frame, the relative draft 18% of the 7th frame, c, adopt between frame cooling, the secondary descaling steel of F1～F2 and F2～F3, it is cooling that back segment is cooled to laminar flow, produce the hot rolled coil of hot rolling thickness specification 2.2mm.Hot rolled coil becomes the chill volume of 0.5mm through the reciprocating cold-rolling mill rolling of single chassis, enter follow-up continuous annealing+painting insulation layer production line, and annealing temperature is 850 ℃, produces the type non-oriented electrical steel finished steel coils.
Non-oriented electromagnetic steel sheet finished product magnetic property is in Table 2, and mechanical property is in Table 3.
The novel electrician's composition of steel of table 1, %
| ? | C | Si | Mn | P | S | Als | B |
| Embodiment 1 | 0.0044 | 0.63 | 0.20 | 0.064 | 0.0059 | 0.015 | 0.0012 |
| Embodiment 2 | 0.0058 | 0.70 | 0.32 | 0.044 | 0.0023 | 0.021 | 0.0019 |
The novel electrical steel steel plate of table 2 magnetic property
| ? | Thickness (mm) | P 1.5/50(W/kg) | B 50(T) |
| Prior art | 0.5 | 4.80～5.50 | 1.71～1.75 |
| Embodiment 1 | 0.5 | 5.081 | 1.749 |
| Embodiment 2 | 0.5 | 5.188 | 1.751 |
[0042] the novel electrical steel mechanical property of steel plate of table 3
| ? | Rp0.2(MPa) | Rm(MPa) | A 50(%) | HV1 |
| Embodiment 1 | 284 | 404 | 33.0 | 121 |
| Embodiment 2 | 292 | 413 | 32.5 | 116 |
Claims (5)
1. a non-oriented electromagnetic steel sheet, its composition quality per-cent is: C≤0.0060%, Si0.60～0.80%, Mn0.20～0.40%, P≤0.10%, S≤0.0080%, Als0.015～0.025%, B0.001～0.002%, all the other are Fe and inevitable impurity element.
2. a non-oriented electromagnetic steel sheet production method according to claim 1, it comprises the steps:
Step 1: converter smelting, becomes molten steel by molten iron smelting, output molten steel;
Step 2: concise through ladle argon-blown, RH vacuum-treat and LF stove, adjust molten steel chemical composition, output meets the molten steel that chemical composition requires;
Step 3: sheet blank continuous casting, in casting process, molten steel overheat is controlled at non-oriented electromagnetic steel sheet liquidus line 15-30 ℃, and casting process adopts sinusoidal mold oscillation curve, and molten steel casting is become to thin slab, output 50～90mm thin thickness slab;
Step 4: tunnel soaking, continuous tunnel furnace temperature is 1150 ± 20 ℃ of soaking, homogenizing thin slab temperature, the thin slab that output temperature evenly meets the demands;
Step 5: finish rolling, rolled piece enters the tandem rolling unit being comprised of seven finishing mills and is rolled, and rolled piece start rolling temperature is 1070 ± 30 ℃, and finishing temperature is 860～900 ℃, and thin slab is rolled into the hot rolled strip that thickness is 2.0～3.5mm;
Step 6: cooling, the band steel complete to rolling carries out cooling, adopt between cooling between frame, first finishing mill and second finishing mill and carry out secondary descaling steel between second finishing mill and the 3rd finishing mill, it is cooling that back segment is cooled to laminar flow, expanded the effective contact of water coolant with sheet material;
Step 7: batch, coiling temperature is 660～700 ℃, and strip coiling is become to coil of strip, output coil of strip;
Step 8: pickling and cold-rolling, carries out Pickling Descaling and cold rolling by coils of hot-rolled steel, the cold-rolled steel coils that output thickness is 0.5mm;
Step 9: continuous annealing is produced, anneals cold-rolled steel coils, the coil of strip after output annealing.
3. the production method of non-oriented electromagnetic steel sheet according to claim 2, is characterized in that: the 260-300 time/min of sinusoidal mold oscillation curve vibrational frequency in described step 3, and amplitude 6-7mm, pulling speed of continuous casting is controlled at 3.0-4.5m/min.
4. the production method of non-oriented electromagnetic steel sheet according to claim 2, is characterized in that: the crystallizer protecting residue in described step 3 is MBG-1 type electrical steel mould flux.
5. the production method of non-oriented electromagnetic steel sheet according to claim 2, it is characterized in that: first finishing mill and second relative draft 40-65% of finishing mill in described step 5, the 3rd finishing mill, the 4th finishing mill and the 5th the relative draft 30～45% of finish rolling, the 6th the relative draft 15-35% of finishing mill, the 7th relative draft≤20% of finishing mill.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104017929A (en) * | 2014-06-12 | 2014-09-03 | 鞍钢股份有限公司 | Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel |
| CN104046760A (en) * | 2014-06-19 | 2014-09-17 | 马钢(集团)控股有限公司 | Production method of electrical steel plate |
| CN106435356A (en) * | 2016-09-13 | 2017-02-22 | 北京首钢股份有限公司 | Method for producing non-oriented band steel for stamping |
| CN107812786A (en) * | 2017-09-15 | 2018-03-20 | 宁波钢铁有限公司 | A kind of hot rolling technology for being used to produce the electrical sheet without metal flow accumulation defect |
| CN108127093A (en) * | 2017-12-21 | 2018-06-08 | 武汉钢铁有限公司 | The method for eliminating non-oriented electromagnetic steel sheet volume surface chromatic aberration defect |
| CN109822070A (en) * | 2018-12-28 | 2019-05-31 | 日照钢铁控股集团有限公司 | A kind of full endless rolling electric drive non-oriented electrical steel of sheet billet and preparation method |
| CN111531138A (en) * | 2020-06-10 | 2020-08-14 | 武汉钢铁有限公司 | Method for producing non-oriented electrical steel by thin slab continuous casting and rolling |
| CN111850402A (en) * | 2020-07-08 | 2020-10-30 | 鞍钢股份有限公司 | Method for producing high-strength corrosion-resistant electromagnetic iron core steel plate in short process |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104017929A (en) * | 2014-06-12 | 2014-09-03 | 鞍钢股份有限公司 | Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel |
| CN104046760A (en) * | 2014-06-19 | 2014-09-17 | 马钢(集团)控股有限公司 | Production method of electrical steel plate |
| CN106435356A (en) * | 2016-09-13 | 2017-02-22 | 北京首钢股份有限公司 | Method for producing non-oriented band steel for stamping |
| CN106435356B (en) * | 2016-09-13 | 2019-06-04 | 北京首钢股份有限公司 | A method of producing punching press No yield point strip |
| CN107812786A (en) * | 2017-09-15 | 2018-03-20 | 宁波钢铁有限公司 | A kind of hot rolling technology for being used to produce the electrical sheet without metal flow accumulation defect |
| CN108127093A (en) * | 2017-12-21 | 2018-06-08 | 武汉钢铁有限公司 | The method for eliminating non-oriented electromagnetic steel sheet volume surface chromatic aberration defect |
| CN109822070A (en) * | 2018-12-28 | 2019-05-31 | 日照钢铁控股集团有限公司 | A kind of full endless rolling electric drive non-oriented electrical steel of sheet billet and preparation method |
| CN111531138A (en) * | 2020-06-10 | 2020-08-14 | 武汉钢铁有限公司 | Method for producing non-oriented electrical steel by thin slab continuous casting and rolling |
| CN111531138B (en) * | 2020-06-10 | 2021-12-14 | 武汉钢铁有限公司 | Method for producing non-oriented electrical steel by thin slab continuous casting and rolling |
| CN111850402A (en) * | 2020-07-08 | 2020-10-30 | 鞍钢股份有限公司 | Method for producing high-strength corrosion-resistant electromagnetic iron core steel plate in short process |
| CN111850402B (en) * | 2020-07-08 | 2021-12-24 | 鞍钢股份有限公司 | Method for producing high-strength corrosion-resistant electromagnetic iron core steel plate in short process |
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Application publication date: 20140212 |