CN1611616A - Method for manufacturing cold-rolled orientation-free electrical sheet - Google Patents
Method for manufacturing cold-rolled orientation-free electrical sheet Download PDFInfo
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- CN1611616A CN1611616A CN 200310108197 CN200310108197A CN1611616A CN 1611616 A CN1611616 A CN 1611616A CN 200310108197 CN200310108197 CN 200310108197 CN 200310108197 A CN200310108197 A CN 200310108197A CN 1611616 A CN1611616 A CN 1611616A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 25
- 238000005097 cold rolling Methods 0.000 claims abstract description 24
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 238000005098 hot rolling Methods 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- -1 B≤0.01% Chemical class 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000013078 crystal Substances 0.000 description 12
- 230000006866 deterioration Effects 0.000 description 10
- 229910000976 Electrical steel Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000002950 deficient Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000009036 growth inhibition Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
This is about the manufacturing method of cold-rolled non-oriented electrical steel, including the following steps: a) the continuous casting of blanks: the liquid steel is continuously cast into a blank of 120-170mm at a pulling speed of 2-3 m/min; b) hot rolling: the blanks are directly hot-rolled or heated into the hot-rolled plate of 900-1150 deg.C and the thickness of the blank is hot-rolled to 0.8-4mm with finishing temperature 800-900deg.C and coiling temperature 500-900deg.C; c) cold rolling: the hot-rolled band undergoes annealing or non annealing treatment and acidwashing, and then the first cold-rolling or the second cold-rolling with annealing until the goal thickness reaches. When the finishing annealing is carried out, the non-oriented electrical steel is produced.
Description
Technical field
The present invention relates to the manufacture method of non-oriented electrical steel.
Background technology
Tradition continuous casting-hot rolling line is the mode of production of the production cold rolling non-oriented electrical steel product of most Steel Plant use, the pardon that is characterized in the production kind is fine, output big (a modern traditional hot rolling is produced the line annual production and can be reached 3,000,000 tons～4,000,000 tons).
It is to be that 0.8～1.5m/min, slab thickness are to carry out under the condition of 210mm～250mm at the continuous casting pulling rate that traditional continuous casting is produced non orientating silicon steel.According to the design of this flow process, there is following problem for non-oriented electrical steel production:
1. under common continuous casting superheating temperature condition (15 ℃～40 ℃), because pulling rate is very low, setting time is very long, the column crystal ratio reaches more than 80% usually for C content is lower than the electrical steel of 50ppm and Si content 1.5%～2.5%, the ratio that is lower than 50ppm and silicone content column crystal greater than 2.5% non orientating silicon steel for C content will reach 100%, and dendrite is thick, and production board produces serious corrugated defective, and the user can't use.Therefore the non-oriented electrical steel of high silicon content is set up electromagnetic mixing apparatus at continuous casting usually in the produced in conventional processes Ultra-low carbon, and the ratio of strand equiax crystal is brought up to more than 50%, thereby eliminates the corrugated defective.The production process complexity, the cost height.
2. continuous casting adopts low overheat (＜15 ℃) also can improve the ratio of the non-oriented electrical steel equiax crystal of high silicon content in the Ultra-low carbon, but temperature treatment is very difficult between converter-refining-continuous casting, and molten steel is very low at mould temperature, viscosity increases, inclusion floating is very difficult, and the ratio of production board inclusion defects increases.Because the growing up of crystal grain when inclusion hinders the production board final annealing makes the iron loss deterioration, inclusion itself and stress field of forming around it also can hinder moving of neticdomain wall simultaneously, and form closure domain and produce demagnetizing field on every side at it, make the magnetic strength deterioration.Therefore no matter from organization of production, surface of steel plate still from magnetic property, the mode of taking the low overheat continuous casting all is worthless.
3. take to improve the mode of molten steel C content, as C being pressed 〉=[(Si+Al)-0.75] %/100 controls, the non orientating silicon steel continuously cast bloom that makes high silicon content has a certain amount of phase transformation in course of hot rolling the time, reply and recrystallization process in the thick deformed grains of elimination.Need dark decarburization when shortcoming is the production board final annealing, annealing time is multiplied, and annealing efficiency is very low, and influence connects the output of moving back the coating unit.This mode also is worthless.
The traditional hot rolling line of the general outfit of traditional continuous casting.Strand on the traditional hot rolling line when rolling the rolling line temperature fall bigger, the assurance ability of finishing temperature a little less than, the fluctuation of magnetic is very big.And often finishing temperature is difficult to improve, and hot-rolled sheet recrystallize rate is on the low side, and crystal grain is less, and magnetic is relatively poor.And the process of strand process cooling (generally being lower than 700 ℃)-reheat, strand heat energy fails to make full use of.
Also have the CSP mode, the slab thickness of CSP is 30～70mm, and the pulling rate when producing silicon steel is 3～5m/min.In this case, because pulling rate is very fast, the non-oriented electrical steel proportion of equiaxed grain of middle high silicon content is higher, and rolling line length is short, and temperature drop is little, and finishing temperature control permission is bigger, and hot-rolled sheet recrystallized structure is good, and finished product magnetic strength height does not have the corrugated defective.But the problem that this technology exists is:
I. because pulling rate is fast, and MnS, AlN are too tiny in the strand, grain growth was very unfavorable when production board was annealed, the iron loss deterioration;
Ii. the production capacity of unit is lower, and annual production has only 1,000,000 tons～1,300,000 tons;
Iii. because slab is thin, pulling rate is very fast, can't produce the kind that other high surface grade require, as automobile exterior panel etc.
Summary of the invention
At the deficiency that above-mentioned traditional continuous casting-hot rolling mode of production and CSP mode exist, the object of the present invention is to provide a kind of manufacture method of cold rolling non-oriented electrical steel, can guarantee that the corrugated defective does not take place production board; Adopt the configuration of continuous casting and hot rolled compact simultaneously, rolling line is realized low-temperature heat and higher temperature finish to gauge easily than traditional weak point, hot-rolled sheet recrystallize ratio height, and crystal grain is thick, production board magnetic is good.
For achieving the above object, technical solution of the present invention is: the manufacture method of cold rolling non-oriented electrical steel comprises the steps:
A) sheet billet continuous casting, molten steel becomes slab with the casting speed continuous casting of 2～3m/min;
B) hot rolling, the direct hot rolling of slab or be heated to 900～1150 ℃ of hot rollings, 800 ℃～950 ℃ of finishing temperatures, 500～900 ℃ of coiling temperatures;
C) cold rolling, the hot rolling band is implemented annealing or unannealed processing, pickling is then implemented final annealing after once cold rolling or the secondary cold-rolling that has process annealing are rolled to target thickness, produces non-oriented electrical steel with this.
Wherein, the thickness 120～170mm of described step a continuous casting steel billet;
Described step b slab thickness is hot-rolled down to 0.8～4mm.
Coiling temperature is 500～900 ℃ after the described step b hot rolling finish to gauge.
The composition characteristics of above-mentioned molten steel is: C≤0.010%, Si≤3.5%, Mn≤2%, Al≤1.5%, P≤0.2%, S≤0.01%, N≤0.010%, O≤0.02%;
Also can comprise among Sn, Sb, Cu, Cr and the Ni one or more, the content range of individual element is for being no more than 0.2%; And can add B, rare earth; B≤0.01%, rare earth≤0.1%.
Wherein, below the C:0.010%, C is the element that hinders grain growth strongly, causes that iron loss increases and magnetic aging, and surpassing 0.010% will bring serious burden to decarburization, preferably be controlled at below 0.003%.
Si :≤3.5%, Si increases the resistance element, is the most important alloying element of electrical steel, surpasses 3.5% and will make electrical steel processibility deterioration, and magnetic strength reduces.
Mn :≤2%, Mn improves the electrical steel condition of surface, reduces hot-short element, is higher than 2% and will makes steel plate processibility deterioration.
Al :≤1.5%, Al increases the resistance element, is the most important alloying element of electrical steel, and surpass 1.5% and will make smelting cast difficulty, steel plate processibility deterioration, magnetic strength reduces.
P :≤0.2%, in steel, add the processibility that certain phosphorus can improve steel plate, make steel plate cold-workability deterioration on the contrary but surpass at 0.2% o'clock.
Below the S:0.01%, surpass 0.01% the Sization thing amount of separating out such as MnS will be increased greatly, hinder grain growth strongly, the iron loss deterioration.
Below the N:0.010%, surpass 0.01% the Nization thing amount of separating out such as AlN will be increased greatly, hinder grain growth strongly, the iron loss deterioration.
Below the O:0.02%, surpass 0.02% the oxide inclusion amount will be increased greatly, hinder grain growth strongly, make simultaneously to be mingled with the demagnetizing field increase that causes, iron loss and magnetic strength deterioration.
Can add a certain amount of Sn, Sb, Cu, Cr and Ni, can improve the texture of production board, magnetic strength is improved, but the content range of individual element be no more than 0.2%, otherwise magnetic is reduced; Add the harm that a certain amount of B can reduce AlN, iron loss will be increased but surpass 0.01%.
Add certain amount of mixed rare earth and can form thick rare earth oxysulfide, the growth of crystal grain when improving production board annealing reduces iron loss, makes the continuous casting of molten steel difficulty but surpass 0.1%.
The invention has the beneficial effects as follows:
The present invention combines traditional continuous casting-hot rolling and thin stock continuous casting hot rolled production advantage, in the production Ultra-low carbon during non-oriented electrical steel continuous casting of high silicon content, under the situation of not taking induction stirring, adopt common superheating temperature continuous casting that the equiax crystal of certain proportion (more than 30%) is also arranged, can guarantee that the corrugated defective does not take place production board.The precipitate size of strand MnS, AlN is more suitable, and is less to production board grain growth inhibition; Adopt the configuration of continuous casting and hot rolled compact simultaneously, rolling line is realized low-temperature heat and higher temperature finish to gauge easily than traditional weak point, hot-rolled sheet recrystallize ratio height, and crystal grain is thick, production board magnetic is good.
Because the slab thickness under the continuous casting pulling rate of the present invention is thicker than CSP, pulling rate is also corresponding slow, this production line can be produced the kind that other high surface grade require.The productivity ratio CSP produces line and exceeds 1,000,000 tons.
Embodiment
Embodiment 1:
Converter, RH vacuum-treat obtain C:0.003%, Si:0.25%, Mn:0.25%, Al:0.25%, P:0.08%, S:0.005%, N:0.003%, O:0.015%, surplus is the molten steel of Fe, casting speed continuous casting with 2.5m/min becomes slab and hot rolling, and hot-rolled sheet pickling after this, the thick cold-reduced sheet of cold rolling one-tenth 0.50mm are through the production board of final annealing acquisition.Thick with traditional 230 bases in final finished plate magnetic thin stock production compares, referring to table 1.
Table 1
| Sequence number | Slab thickness mm | Strand heating ℃ | Finishing temperature ℃ | Coiling temperature ℃ | Hot-rolled sheet thickness mm | ??P 15/50??W/kg | ??B 50????T |
| Embodiment 11 | ????150 | ????1080 | ??870 | ????680 | ????2.10 | ????4.80 | ??1.76 |
| Embodiment 12 | ????150 | ????1100 | ??880 | ????680 | ????2.10 | ????4.70 | ??1.79 |
| Comparative example 1 | ????230 | ????1100 | ??830 | ????680 | ????2.10 | ????5.50 | ??1.73 |
| Comparative example 2 | ????50 | ????1120 | ??870 | ????680 | ????2.10 | ????6.00 | ??1.77 |
Embodiment 2:
Converter, RH vacuum-treat obtain C:0.0025%, Si:2.00%, Mn:0.25%, Al:0.23%, P:0.008%, S:0.004%, N:0.002%, O:0.0015%, surplus is the molten steel of Fe, becomes slab, hot rolling with the casting speed continuous casting of 2.5m/min, after this hot-rolled sheet pickling, the thick cold-reduced sheet of cold rolling one-tenth 0.50mm obtain production board through final annealing again.Compare with traditional 230 bases thick (induction stirring and no induction stirring are arranged) and the final finished plate magnetic of thin stock production, see Table 2.
Table 2
| Sequence number | Slab thickness | Strand heating ℃ | Finishing temperature ℃ | Hot-rolled sheet thickness | Hot-rolled sheet annealing temperature ℃ | P 15/50?W/kg | ??B 50???T | The finished surface quality | Equiax crystal |
| Embodiment 21 | ??150 | ??1080 | ????890 | ????2.10 | Do not have | ??3.20 | ??1.72 | Good | ??50％ |
| Embodiment 22 | ??150 | ??1100 | ????900 | ????2.10 | Do not have | ??3.20 | ??1.73 | Good | ??50％ |
| Embodiment 23 | ??150 | ??1100 | ????900 | ????2.10 | ????950 | ??2.80 | ??1.75 | Good | ??50％ |
| Comparative example 4 | ??230 | ??1100 | ????830 | ????2.10 | ????950 | ??3.50 | ??1.72 | Good | ??60％ |
| Comparative example 5 | ??230 | ??1100 | ????830 | ????2.10 | Do not have | ??4.00 | ??1.66 | Difference | ??0 |
| Comparative example 6 | ??50 | ??1120 | ????900 | ????2.10 | Do not have | ??3.80 | ??1.73 | Good | ??70％ |
Embodiment 3:
Converter, RH vacuum-treat obtain C:0.0025%, Si:3.00%, Mn:0.25%, Al:0.50%, P:0.010%, S:0.003%, N:0.0015%, O:0.0015%, surplus is the molten steel of Fe, casting speed continuous casting with 2.5m/min becomes slab and hot rolling, hot-rolled sheet pickling after this, the thick cold-reduced sheet of cold rolling one-tenth 0.50mm, and through final annealing acquisition production board.Thick with traditional 230mm base in final finished plate magnetic thin stock production compares, referring to table 3.
Table 3
| Sequence number | Slab thickness mm | Strand heating ℃ | Finishing temperature ℃ | Hot-rolled sheet thickness mm | Hot-rolled sheet annealing temperature ℃ | P 15/50?W/kg | ???B 50????T | Finished surface | Equiax crystal |
| Embodiment 31 | ????150 | ????1080 | ????880 | ???2.10 | Do not have | ??2.60 | ??1.68 | Good | ??40％ |
| Embodiment 32 | ????150 | ????1100 | ????900 | ???2.10 | Do not have | ??2.20 | ??1.71 | Good | ??40％ |
| Embodiment 33 | ????150 | ????1100 | ????900 | ???2.10 | ??1000℃ | ??2.10 | ??1.73 | Good | ??40％ |
| Comparative example 7 | ????230 | ????1100 | ????830 | ???2.10 | ??1000℃ | ??2.60 | ??1.69 | Good | ??50％ |
| Comparative example 8 | ????230 | ????1120 | ????830 | ???2.10 | Do not have | ??3.20 | ??1.63 | Difference | ??0 |
| Comparative example 9 | ????50 | ????1120 | ????900 | ???2.10 | Do not have | ??2.80 | ??1.70 | Good | ??50％ |
Claims (8)
1. the manufacture method of cold rolling non-oriented electrical steel comprises the steps,
A) sheet billet continuous casting, molten steel becomes slab with the casting speed continuous casting of 2～3m/min;
B) hot rolling, the direct hot rolling of slab or be heated to 900～1150 ℃ of hot rollings, 800 ℃～950 ℃ of finishing temperatures;
C) cold rolling, the hot rolling band is implemented annealing or unannealed processing, pickling is then implemented final annealing after once cold rolling or the secondary cold-rolling that has process annealing are rolled to target thickness, produces non-oriented electrical steel with this.
2. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 1 is characterized in that, the composition of above-mentioned molten steel is, mass percent, C≤0.010%, Si≤3.5%, Mn≤2%, Al≤1.5%, P≤0.2%, S≤0.01%, N≤0.010%, O≤0.02%, Yu Tie and inevitable impurity.
3. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 2 is characterized in that, also comprises among Sn, Sb, Cu, Cr and the Ni one or more, and the content of individual element is no more than 0.2%.
4. as the manufacture method of claim 2 or 3 described cold rolling non-oriented electrical steels, it is characterized in that, also comprise B, rare earth, B≤0.01%, rare earth≤0.1%.
5. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 2 is characterized in that, the preferable range of described molten steel composition C is controlled at below 0.003%.
6. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 1 is characterized in that, the thickness 120～170mm of described step a continuous casting steel billet.
7. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 1 is characterized in that, described step b slab thickness is hot-rolled down to 0.8～4mm.
8. the manufacture method of cold rolling non-oriented electrical steel as claimed in claim 1 is characterized in that, coiling temperature is 500～900 ℃ after the described step b hot rolling finish to gauge.
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Cited By (26)
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| CN100372964C (en) * | 2005-06-30 | 2008-03-05 | 宝山钢铁股份有限公司 | Non-orientation electrical steel and its making process |
| CN100419108C (en) * | 2006-07-31 | 2008-09-17 | 武汉钢铁(集团)公司 | Production method of 250 MPa grade cold rolled magnetic pole steel |
| CN100446919C (en) * | 2005-06-30 | 2008-12-31 | 宝山钢铁股份有限公司 | Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction |
| CN100463979C (en) * | 2005-10-15 | 2009-02-25 | 鞍钢股份有限公司 | Manufacturing method of cold-rolled electrical steel special for compressor |
| CN101914726A (en) * | 2010-06-23 | 2010-12-15 | 马鞍山钢铁股份有限公司 | Low-carbon low-silicon high-efficiency non-oriented electrical steel sheet and production method thereof |
| WO2012041053A1 (en) | 2010-09-30 | 2012-04-05 | 宝山钢铁股份有限公司 | Non-oriented electric steel plate without corrugated fault and production method thereof |
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- 2003-10-27 CN CN 200310108197 patent/CN1258608C/en not_active Expired - Lifetime
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| CN100372964C (en) * | 2005-06-30 | 2008-03-05 | 宝山钢铁股份有限公司 | Non-orientation electrical steel and its making process |
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