CN103451395A - Preparation process of chromium alloyed high-magnetic strength and low-iron loss oriented silicon steel - Google Patents
Preparation process of chromium alloyed high-magnetic strength and low-iron loss oriented silicon steel Download PDFInfo
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- CN103451395A CN103451395A CN2013104033832A CN201310403383A CN103451395A CN 103451395 A CN103451395 A CN 103451395A CN 2013104033832 A CN2013104033832 A CN 2013104033832A CN 201310403383 A CN201310403383 A CN 201310403383A CN 103451395 A CN103451395 A CN 103451395A
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Abstract
The invention relates to a preparation process of a chromium alloyed high-magnetic strength and low-iron loss oriented silicon steel. The preparation process is characterized by comprising the following steps of a) ore dressing so as to guarantee that in blast furnace molten iron, the content of Ni is less than or equal to 0.008wt%, the content of v is less than or equal to 0.002wt%, the content of Ti is less than or equal to 0.002wt% and the content of As is less than or equal to 0.002wt%; b) carrying out chromium alloying in a converter processing step and carrying out fine adjustment of content of Cr in an RH vacuum treatment process step so that the content of Cr in the steel ranges from 0.03wt% and 0.12wt%; and c) performing the electromagnetic stirring of a crystallizer during slab continuous casting, wherein the current intensity is 350 A and the current frequency is 6 Hz. The preparation process provided by the invention has the advantages that the oriented silicon steel is alloyed to realize segregation of chromium along the crystal boundary and enhance the inhibition capability, and as a result, the primary crystal grains are finer and evener after annealing, the secondary recrystallization is perfect, the iron loss is reduced and the magnetic induction intensity is improved, due to the segregation of chromium at the interface of a MnS mass point and a matrix, the interface energy of the precipitate is reduced and the precipitate is inhibited against having Ostwald growth, and moreover, due to the electromagnetic stirring of the crystallizer, the segregation of sulfur is relieved, the crystal grains are thinned and columnar crystals are reduced.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel.
Background technology
Fast development along with national economy, China's generating capacity is constantly increasing, the demand of making the oriented silicon steel of power equipment main raw is also constantly increasing, and consumes and reaches more than 1,500,000 tons now, and China has become one of maximum consumption market of world's oriented silicon steel.In the loss of power system electric energy, the power transformer loss accounts for 20～25% of power system loss, medium and small transformer loss accounts for 40～50% of power system transformer loss, the Chinese government has proposed energy-saving and cost-reducing work is put in the first place at present, concerning electric power energy, the one, improve generating efficiency, the 2nd, the loss of decrease grid transmission.Solve the approach of line losses, the one, improve voltage, adapt to remote power transmission; The 2nd, converting equipment technology innovation, decrease equipment own loss; The 3rd, the construction that strengthens the direct current power transmission.Oriented silicon steel is the critical material that determines transformer noload losses, so want to meet the requirement of high voltage large capcity low-loss product, must select the name oriented silicon steel of height of increasing high-magnetic induction, low-iron loss.
No matter the oriented silicon steel that external Japan, Russia and Korea S produce is in quality product, or the aspects such as new technology and new varieties, all in rank first, and a large amount of outlet.Domestic last century the fifties oriented silicon steel that begins one's study, within 1974, Wuhan Iron and Steel Company introduces cold rolled silicon steel manufacturing equipment and patent from nippon, formal orientation and the non orientating silicon steel of producing 11 trades mark in 1979, within 2008, Baoshan Iron and Steel Company starts to produce oriented silicon steel, and Domestic Private Enterprises has also been produced oriented silicon steel by independent research thereupon.At present, the output of domestic oriented silicon steel increases year by year, and the quality product of common orientation silicon steel and production capacity be the satisfying the market requirement substantially, still, the production technique of high name oriented silicon steel is compared and is still had certain gap with Foreign Advanced Lerel with output and quality, can not meet the growing market requirement.Abroad to take the production technique that Japan is representative, take AlN+MnS and produce the Hi-B steel series product of high-magnetic induction, low-iron loss as inhibitor, high temperature hot rolling and heavy reduction rate once cold rolling method as Nippon Steel Corp adopts, Kawasaki Steel company adopts to take MnSe+Sb and produce the RGH steel series product of high-magnetic induction, low-iron loss as inhibitor, high temperature hot rolling and twice cold-rolling practice.China Iron And Steel Company adopts two kinds of operational paths, and a kind of Nippon Steel that is similar to is to adopt to take AlN as the main inhibitor of doing, the high temperature hot rolling, and heavy reduction rate once cold rolling method, another kind is to adopt with AlN, Cu
2s and (MnCu)
2s makes inhibitor, Low Temperature Hot Rolling, and twice cold-rolling practice of medium draft, according to the height of hot-rolled temperature, usually by front a kind of high temperature process that is called, rear a kind of low temperature method that is called.High temperature process adopts temperature strand heating more than 1400 ℃, good product quality, and the trade mark is high, but production cost is also very high.Low temperature method adopts Cu
2s, AIN and (MnCu)
2s makes inhibitor, slab heating temperature is lower 100 ℃ than high temperature process, be less than 1300 ℃, because the solid solubility temperature of MnS is 1315～1320 ℃, can produce the MnS sulfides of thick bulk during casting blank solidification, when being less than 1300 ℃ of heating, these sulfide and other inhibitor solid solutions are not thorough, affect the amount of separating out of inhibitor subsequently, another low temperature method does not adopt normalizing process, AIN does not have tinyly evenly to separate out, so, the inhibitor effect is not given full play to, with respect to the high temperature process restraint deficiency that seems, first crystal grain inequality after annealing, the secondary recrystallization imperfection, product magnetic is bad, iron loss is high, magnetic induction density is low, the high trade mark ratio of oriented silicon steel of producing in this way is low, in GB GB/T2521, the 120 above trades mark only account for 36%-48%, all the other major parts are common designations, in addition due to the restraint deficiency, can't produce thinner band.
The tradition low-temperature oriented silicon steel, because the reasons such as alloying is simple, restraining effect is limited, product specification is low and production cost is high can not meet the market requirement, limits its popularization.Its major cause is: (1), because Heating temperature is low, alloying is low, inhibitor effect deficiency; (2) the high trade mark hit rate of oriented silicon steel is low; (3) can't produce and be less than the 0.27mm specification product; (4) production cost is high.
Summary of the invention
The objective of the invention is that low-temperature heating oriented silicon steel restraining effect is not enough, high trade mark hit rate is low and thin slab product is produced the technical problems such as difficulty in order to solve, provide a kind of by increasing chromium alloying, improving clarity, electromagnetic agitating technology means, the manufacture craft of the chromium alloying high-magnetic induction, low-iron loss oriented silicon steel that the high trade mark shoots straight, production cost is low of developing.
The objective of the invention is to be achieved through the following technical solutions.
The manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention comprises the steps:
Technical process: ore dressing → blast-melted → hot metal pretreatment → converter → RH vacuum-treat → sheet billet continuous casting → hot-loading and hot-conveying → heating of plate blank → hot rolling → once cold rolling → decarburizing annealing → secondary cold-rolling → painting magnesium oxide → high temperature bell-type furnace annealing → stretching is coated with insulation layer → slitting, packing, warehouse-in; Wherein:
A) ore dressing, select the ore that impurity of high grade is low, guarantees blast-melted Ni content≤0.008 % by weight, v content≤0.002 % by weight, Ti content≤0.002 % by weight, As content≤0.002 % by weight;
B) carry out chromium alloying in the converter process step, carry out the fine setting of Cr content in RH vacuum processing technique step, making Cr content in steel is 0.03～0.12 % by weight;
C) carry out M-EMS, strength of current 350A, power frequency 6Hz when sheet billet continuous casting;
D) the final product specification of rolling comprises 0.23mm, 0.25mm, 0.27mm, 0.30mm.
Beneficial effect of the present invention:
1. beneficiated iron ore stone, guarantee that maximum amplitude reduces unhelpful element Ni, V, Ti and the As content in molten iron, improves the steel purity, thereby improve oriented silicon steel magnetic.
2. in steel, Jia Ru Chrome Hou ， Chrome, along Grain Boundary Segregation, strengthens the inhibition ability; Chrome, in the interface of MnS particle and matrix segregation, reduces the precipitate interfacial energy, thereby suppress precipitate generation oersted Ward, grows up, and keeps strong inhibition ability.Chrome increases the sulfide amount of separating out tiny in hot-rolled sheet, and is evenly distributed, and take these tiny sulfide to separate out tiny uniform AIN as core; The segregation of You Yu Chrome, during cold rolling ageing treatment, effectively solid solution carbon and nitrogen amount increase.After making decarburizing annealing by these effects, first crystal grain is more tiny evenly, { 110}, { 211} and { 111} utmost point increase in density, { 100} utmost point density reduces, and secondary nucleus quantity increases, and the secondary recrystallization temperature reduces, secondary recrystallization is perfect, and the subgrain size is less, and magnetic is improved.
3. the employing M-EMS, can obviously alleviate the sulphur segregation, and crystal grain thinning reduces column crystal, increases equiax crystal, makes structural constituent even, and the rank of subsurface bubble is reduced greatly.
4. steel band attenuate, the top layer secondary nucleus also attenuate of district that rises, surface-area increases, crystal boundary reveals the groove formed from the teeth outwards the effect that subgrain is grown up that hinders, as subgrain, the grow up contribution of crystal boundary energy of motivating force reduces, and surface energy increases as the effect of motivating force, and secondary recrystallization more is difficult for perfect, need stronger restraint, steel Zhong Jia Chrome improves restraint just provides condition for the production of thin size steel band.
5. adopt Jia Chrome alloying to produce oriented silicon steel, can still adopt low-temperature heat, save the normalizing operation, increase substantially high trade mark hit rate, there is production efficiency high, the characteristics that production cost is low.
Embodiment
Application principle of the present invention, effect and effect, be explained by following embodiment.
Embodiment 1
The manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention, comprise the steps:
A) Ni content 0.005 % by weight, V content 0.002 % by weight, Ti content 0.002 % by weight, As content 0.002 % by weight in the molten iron;
B) Cr content 0.03 % by weight;
C) M-EMS during sheet billet continuous casting, strength of current 350A, power frequency 6Hz;
D)) steel band is rolled down to the 0.23mm finished product thickness.
Embodiment 2
The manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention, comprise the steps:
A) Ni content 0.006 % by weight, V content 0.001 % by weight, Ti content 0.001 % by weight, As content 0.002 % by weight in the molten iron;
B) Cr content 0.05 % by weight;
C) M-EMS during sheet billet continuous casting, strength of current 350A, power frequency 6Hz;
D)) steel band is rolled down to the 0.25mm finished product thickness.
Embodiment 3
The manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention, comprise the steps:
A) Ni content 0.004 % by weight, V content 0.001 % by weight, Ti content 0.002 % by weight, As content 0.002 % by weight in the molten iron;
B) Cr content 0.06 % by weight;
C) M-EMS during sheet billet continuous casting, strength of current 350A, power frequency 6Hz;
D)) steel band is rolled down to the 0.27mm finished product thickness.
Embodiment 4
The exploitation of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention, comprise the steps:
A) Ni content 0.007 % by weight, V content 0.001 % by weight, Ti content 0.002 % by weight, As content 0.001 % by weight in the molten iron;
B) Cr content 0.10 % by weight;
C) M-EMS during sheet billet continuous casting, strength of current 350A, power frequency 6Hz;
D)) steel band is rolled down to the 0.30mm finished product thickness.
The manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention:
Beneficiated iron ore, the clarity of assurance molten iron, because can't remove these impurity in smelting process subsequently, thus the magnetic of raising oriented silicon steel; In casting process, adopt M-EMS to reduce the sulphur segregation, improve sulfide solid solution effect, the strengthening restraining effect; At AlN+(Mn, Cu)
2s+Cu
2add 0.03%-0.12%Cr ， Chrome on S composite inhibitor basis along Grain Boundary Segregation, strengthen the inhibition ability; Chrome, in the interface of MnS particle and matrix segregation, reduces the precipitate interfacial energy, thereby suppress precipitate generation oersted Ward, grows up, and keeps strong inhibition ability.Chrome increases the sulfide amount of separating out tiny in hot-rolled sheet, and is evenly distributed, and take these tiny sulfide to separate out tiny uniform AIN as core; The segregation of You Yu Chrome, during cold rolling ageing treatment, effectively solid solution carbon and nitrogen amount increase, by above-mentioned these effects, restraint is strengthened, and makes after decarburizing annealing first crystal grain more tiny evenly, 110}, 211} and the increase in density of the 111} utmost point, { 100} utmost point density reduces, secondary nucleus quantity increases, and the secondary recrystallization temperature reduces, and secondary recrystallization is perfect, magnetic induction density improves, iron loss reduces, and high trade mark hit rate improves, and possesses the more condition of thin strip of producing.
Adopt the key technical indexes of the oriented silicon steel that the manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention makes:
1.Cr content is 0.03～0.12%,
Product size be 0.23,0.25,0.27,0.30mm; Wherein 0.23mm is that Kunming Market increases, and 0.25mm is nonstandard product.
3. the above trade mark of national standard 120 > 80%, magnetic strength value>1.85T;
The key technical indexes that the high-magnetic induction, low-iron loss oriented silicon steel of being produced by the present invention detects:
1. product operative norm: GB GB/T2521-2008, GB/T3655-2008, GB/T2522-2007, YB/T5224-2006.
2 portioned products detect index.
Other index detects:
Interlamination resistance>=60 Ω .cm
2/ sheet
Tack A – C level
In sum, the manufacture craft of chromium alloying high-magnetic induction, low-iron loss oriented silicon steel of the present invention, there is the technical characterstics such as production technology is relatively simple, production cost is low, magnetic property is better, also widened product scope simultaneously, improved the plurality of advantages such as high trade mark hit rate.
Claims (1)
1. the manufacture craft of a chromium alloying high-magnetic induction, low-iron loss oriented silicon steel, comprise the steps: technical process: ore dressing → blast-melted → hot metal pretreatment → converter → RH vacuum-treat → sheet billet continuous casting → hot-loading and hot-conveying → heating of plate blank → hot rolling → once cold rolling → decarburizing annealing → secondary cold-rolling → painting magnesium oxide → high temperature bell-type furnace annealing → stretching is coated with insulation layer → slitting, packing, warehouse-in, it is characterized in that:
A) ore dressing, select the ore that impurity of high grade is low, guarantees blast-melted Ni content≤0.008 % by weight, v content≤0.002 % by weight, Ti content≤0.002 % by weight, As content≤0.002 % by weight;
B) carry out chromium alloying in the converter process step, carry out the fine setting of Cr content in RH vacuum processing technique step, making Cr content in steel is 0.03～0.12 % by weight;
C) carry out M-EMS, strength of current 350A, power frequency 6Hz when sheet billet continuous casting;
D) the final product specification of rolling comprises 0.23mm, 0.25mm, 0.27mm, 0.30mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930593A (en) * | 2021-10-26 | 2022-01-14 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
| CN114606435A (en) * | 2022-02-09 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor |
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|---|---|---|---|---|
| CN1073728A (en) * | 1991-12-26 | 1993-06-30 | 浦项综合制铁株式会社 | Manufacturing has the method for ferromagnetic plates with high magnetic flux density orientation siliconized plate |
| CN101713047A (en) * | 2009-12-22 | 2010-05-26 | 武汉钢铁(集团)公司 | Cr-contained non-oriented electrical steel and production method thereof |
| CN102330021A (en) * | 2011-09-16 | 2012-01-25 | 江油市丰威特种带钢有限责任公司 | Full production process of low-temperature oriented silicon steel |
-
2013
- 2013-09-08 CN CN2013104033832A patent/CN103451395A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073728A (en) * | 1991-12-26 | 1993-06-30 | 浦项综合制铁株式会社 | Manufacturing has the method for ferromagnetic plates with high magnetic flux density orientation siliconized plate |
| CN101713047A (en) * | 2009-12-22 | 2010-05-26 | 武汉钢铁(集团)公司 | Cr-contained non-oriented electrical steel and production method thereof |
| CN102330021A (en) * | 2011-09-16 | 2012-01-25 | 江油市丰威特种带钢有限责任公司 | Full production process of low-temperature oriented silicon steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930593A (en) * | 2021-10-26 | 2022-01-14 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
| CN113930593B (en) * | 2021-10-26 | 2024-01-16 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
| CN114606435A (en) * | 2022-02-09 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor |
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Application publication date: 20131218 |