CN106048411A - Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel - Google Patents

Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel Download PDF

Info

Publication number
CN106048411A
CN106048411A CN201610486156.4A CN201610486156A CN106048411A CN 106048411 A CN106048411 A CN 106048411A CN 201610486156 A CN201610486156 A CN 201610486156A CN 106048411 A CN106048411 A CN 106048411A
Authority
CN
China
Prior art keywords
cold
temperature
production method
rolling
described step
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610486156.4A
Other languages
Chinese (zh)
Inventor
何峰
王立涛
裴英豪
董梅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maanshan Iron and Steel Co Ltd
Original Assignee
Maanshan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maanshan Iron and Steel Co Ltd filed Critical Maanshan Iron and Steel Co Ltd
Priority to CN201610486156.4A priority Critical patent/CN106048411A/en
Publication of CN106048411A publication Critical patent/CN106048411A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The invention relates to cold-rolled oriented electrical steel for a transformer and a production method of the cold-rolled oriented electrical steel. The cold-rolled oriented electrical steel comprises the components as follows: 0.02-0.05% of C, 3.0-3.3% of Si, 0.10-0.30% of Mn, less than or equal to 0.02% of P, 0.01-0.04% of Als, 0.04-0.06% of Cu, 0.005-0.015% of S, 0.005-0.015% of N, less than or equal to 0.004% of Ti, and the balance Fe and unavoidable impurities. The production method comprises the steps of hot rolling, cold rolling and annealing. By adopting the conventional hot rolling technology, Cu2S+MnS acts as an inhibitor, an electrical steel plate having excellent rolling orientation and magnetic performances is produced, and the finished oriented electrical steel is outstanding in magnetic performance, low in iron loss, high in magnetic induction, and small in magnetic performance fluctuation.

Description

A kind of transformator cold-rolled orientation electrical sheet and production method thereof
Technical field
The invention belongs to oriented electrical steel production technical field, particularly relate to a kind of transformator cold rolling non-orientation electrician Steel and production method thereof.
Background technology
Cold-rolled orientation electrical sheet is largely used to manufacture transformator etc..Transformator is the highest to the magnetic property requirements of electrical sheet, right The magnetic property of rolling direction has very strict requirements.Produce cold-rolled orientation electrical sheet to meet strictly wanting of downstream transformers user Ask the most necessary.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of transformator cold rolling non-oriented electrical steel and producer thereof Method.The present invention is by controlling the chemical composition in steel, and uses suitable production technology, it is thus achieved that rolling direction function admirable Oriented electric product made from steel, 0.30mm oriented electrical steel finished product iron loss P of manufacture1.7/50≤ 1.20W/kg, B8≥1.78T。
The technical solution used in the present invention is:
A kind of transformator cold-rolled orientation electrical sheet, its raw material components and percentage composition be: C0.02～0.05%, Si3.0 ～3.3%, Mn0.10～0.30%, P≤0.02%, Als 0.01～0.04%, Cu0.04～0.06%, S 0.005～ 0.015%, N0.005～0.015%, Ti≤0.004%, remaining is Fe and inevitable impurity.In the hot rolling, adopt Become austenitic area by the C-shaped of above-mentioned content, make Cu2S MnS is substantially soluble in the matrix growth as inhibitor suppression hot rolling crystal grain.
A kind of production method of transformator cold-rolled orientation electrical sheet, step includes:
(1), molten steel direct casting become slab, slab is cooled, chilling temperature more than 500 DEG C, adds subsequently into heating furnace Heat, the temperature 1200 of heating furnace～1300 DEG C, heating and thermal insulation time more than 3.0h；
(2), by hot rolled for the slab after the heating and thermal insulation hot rolled plate being rolled into 2.0～2.5mm thickness；
(3), hot rolled plate is through overpickling, once cold rolling, decarburizing annealing, secondary cold-rolling, the coating of MgO interleaving agent, high temperature bell-type Annealing, insulating coating and stretching and leveling and make the oriented electrical steel strip finished product of 0.3mm thickness.
In described step (2), the finishing temperature of hot rolling is at 900～960 DEG C, and coiling temperature is at 540～590 DEG C；
Pickling chlorohydric acid pickling in described step (3), pickling temperature is 70～90 DEG C；
In described step (3), once cold rolling is carried out on reversable mill, 5～6 passes, the total reduction of once cold rolling 60～80%；
In described step (3), decarburizing annealing is carried out in continuous annealing furnace, and annealing temperature is 800～850 DEG C, temperature retention time It is 10～40min, decarburization to below 40ppm；
In described step (3), secondary cold-rolling is carried out on reversable mill, 3～4 passes, the total reduction of secondary cold-rolling 40～60%；
In described step (3), the baking temperature of MgO interleaving agent coating is 480～510 DEG C；
In described step (3), high temperature bell-type annealing is carried out in bell type annealing furnace, and annealing temperature is 1100～1200 DEG C, protects The temperature time is 5～10h；
In described step (3), insulating coating and stretching and leveling are carried out on planisher, the permanent reduction ratio pattern control of smooth employing System, reduction ratio is 2%～6%.
Using the cold-rolled orientation electrical steel strip that said method is made, its rolling direction magnetic property is good, and iron loss is low, magnetic strength Height, surface quality is good, can meet the demand of high-end transformator user.
Compared with prior art, transformator cold-rolled orientation electrical sheet and the production method thereof of the present invention has following excellent Point:
Present invention employs conventional hot rolling technology, utilize Cu2S MnS produces rolling direction magnetic property as inhibitor Excellent electric steel plate, the magnetic property of electrical sheet finished product rolling direction is excellent, and iron loss is low, magnetic strength is high, and magnetic property fluctuation is little, its Iron loss P1.7/50≤ 1.20W/kg, B8≥1.78T。
Detailed description of the invention
Embodiment 1
A kind of transformator cold-rolled orientation electrical sheet and production method thereof, molten steel direct casting depresses into thickness with wick-containing The slab of 230mm, slab is cooled to 600 DEG C of entrance heating furnace heating and thermal insulations, and the temperature of heating furnace is at 1280 DEG C, and heat time heating time is 4.0h；The hot rolled plate of 2.2mm thickness is become with seven frame continuous rollings again through 5 passage roughing；Hot rolled plate is through overpickling and once Cold rolling, decarburizing annealing, secondary cold-rolling, the coating of MgO interleaving agent, high temperature bell-type annealing, insulating coating and stretching and leveling and make The oriented electrical steel strip finished product of 0.3mm thickness.The chemical component weight percentage ratio of slab is C:0.042, Si:3.05, Mn: 0.24, P:0.008, Als:0.32, Cu:0.055, S:0.0078, N:0.012, Ti:0.0012, remaining is Fe and inevitable Impurity；The finishing temperature of hot rolling is 950 DEG C, and coiling temperature is 560 DEG C；Chlorohydric acid pickling temperature is 80 DEG C；Once cold rolling 5 passage Being rolled to 0.6mm thickness, the total reduction of once cold rolling is 72.7%；Decarburization annealing temperature is 830 DEG C, temperature retention time 20min, de- Carbon is to below 40ppm；Secondary cold-rolling 4 passage is rolled to 0.3mm thickness, and the total reduction of secondary cold-rolling is 50%；MgO interleaving agent is coated with The baking temperature covered 500 DEG C；High temperature bell-type annealing temperature is 1160 DEG C, temperature retention time 8h；Stretching and leveling reduction ratio is 4%.
Through the cold-rolled orientation electrical steel strip excellent surface quality that above-mentioned technique manufactures, rolling direction iron loss P of finished product1.7/50 For 1.15W/kg, magnetic strength B8For 1.78T, magnetic property is excellent.
Embodiment 2
A kind of transformator cold-rolled orientation electrical sheet and production method thereof, molten steel direct casting depresses into thickness with wick-containing The slab of 230mm, slab is cooled to 520 DEG C of entrance heating furnace heating and thermal insulations, and the temperature of heating furnace is at 1260 DEG C, and heat time heating time is 3.5h；The hot rolled plate of 2.2mm thickness is become with seven frame continuous rollings again through 5 passage roughing；Hot rolled plate is through overpickling and once Cold rolling, decarburizing annealing, secondary cold-rolling, the coating of MgO interleaving agent, high temperature bell-type annealing, insulating coating and stretching and leveling and make The oriented electrical steel strip finished product of 0.3mm thickness.The chemical component weight percentage ratio of slab is C:0.028, Si:3.25, Mn: 0.12, P:0.015, Als:0.24, Cu:0.043, S:0.0056, N:0.0058, Ti:0.0035, remaining is Fe and inevitable Impurity；The finishing temperature of hot rolling is 940 DEG C, and coiling temperature is 545 DEG C；Chlorohydric acid pickling temperature is 85 DEG C；Once cold rolling 5 passage Being rolled to 0.6mm thickness, the total reduction of once cold rolling is 72.7%；Decarburization annealing temperature is 820 DEG C, temperature retention time 15min；Two Secondary cold rolling 4 passages are rolled to 0.3mm thickness, and the total reduction of secondary cold-rolling is 50%；The baking temperature 490 of MgO interleaving agent coating ℃；High temperature bell-type annealing temperature is 1150 DEG C, temperature retention time 7h；Stretching and leveling reduction ratio is 6%.
Through the cold-rolled orientation electrical steel strip excellent surface quality that above-mentioned technique manufactures, rolling direction iron loss P of finished product1.7/50 For 1.17W/kg, magnetic strength B8For 1.78T, magnetic property is excellent.

Claims (10)

1. a transformator cold-rolled orientation electrical sheet, its raw material components and percentage composition are: C0.02～0.05%, Si3.0～ 3.3%, Mn0.10～0.30%, P≤0.02%, Als 0.01～0.04%, Cu0.04～0.06%, S 0.005～ 0.015%, N0.005～0.015%, Ti≤0.004%, remaining is Fe and inevitable impurity.
2. a transformator production method for cold-rolled orientation electrical sheet, step includes:
(1), molten steel direct casting become slab, slab is cooled, chilling temperature more than 500 DEG C, subsequently into heating furnace heat, add The temperature 1200 of hot stove～1300 DEG C, heating and thermal insulation time more than 3.0h；
(2), by hot rolled for the slab after the heating and thermal insulation hot rolled plate being rolled into 2.0～2.5mm thickness；
(3), hot rolled plate through overpickling, once cold rolling, decarburizing annealing, secondary cold-rolling, the coating of MgO interleaving agent, high temperature bell-type annealing, Insulating coating and stretching and leveling and make the oriented electrical steel strip finished product of 0.3mm thickness.
3. production method as claimed in claim 2, it is characterised in that: in described step (2) finishing temperature of hot rolling 900～ 960 DEG C, coiling temperature is at 540～590 DEG C.
4. production method as claimed in claim 2, it is characterised in that: pickling chlorohydric acid pickling in described step (3), pickling temperature Degree is 70～90 DEG C.
5. production method as claimed in claim 2, it is characterised in that: in described step (3), once cold rolling is on reversable mill Carrying out, 5～6 passes, the total reduction of once cold rolling is 60～80%.
6. production method as claimed in claim 2, it is characterised in that: in described step (3), decarburizing annealing is at continuous annealing furnace In carry out, annealing temperature is 800～850 DEG C, and temperature retention time is 10～40min, decarburization to below 40ppm.
7. production method as claimed in claim 2, it is characterised in that: in described step (3), secondary cold-rolling is on reversable mill Carrying out, 3～4 passes, the total reduction of secondary cold-rolling is 40～60%.
8. production method as claimed in claim 2, it is characterised in that: the dry temperature of MgO interleaving agent coating in described step (3) Degree is 480～510 DEG C.
9. production method as claimed in claim 2, it is characterised in that: in described step (3), high temperature bell-type annealing moves back at bell-type Carrying out in stove, annealing temperature is 1100～1200 DEG C, and temperature retention time is 5～10h.
10. production method as claimed in claim 2, it is characterised in that: in described step (3), insulating coating and stretching and leveling exist Carrying out on planisher, the permanent reduction ratio Schema control of smooth employing, reduction ratio is 2%～6%.
CN201610486156.4A 2016-06-27 2016-06-27 Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel Pending CN106048411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610486156.4A CN106048411A (en) 2016-06-27 2016-06-27 Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610486156.4A CN106048411A (en) 2016-06-27 2016-06-27 Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel

Publications (1)

Publication Number Publication Date
CN106048411A true CN106048411A (en) 2016-10-26

Family

ID=57167099

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610486156.4A Pending CN106048411A (en) 2016-06-27 2016-06-27 Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel

Country Status (1)

Country Link
CN (1) CN106048411A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107723590A (en) * 2017-09-28 2018-02-23 马钢(集团)控股有限公司 A kind of transformer cold-rolled orientation electrical sheet and its production method
CN108486453A (en) * 2018-03-27 2018-09-04 东北大学 A kind of preparation method of low-iron loss high-magnetic strength non-oriented silicon steel plate
CN113174468A (en) * 2021-04-30 2021-07-27 福建省奥克兰光电科技有限公司 Two-stage annealing process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace
CN113174469A (en) * 2021-04-30 2021-07-27 福建省奥克兰光电科技有限公司 Energy-saving process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1148411A (en) * 1995-03-14 1997-04-23 于西纳·萨西罗公司 Method for making a gain-oriented electric steel sheet, particularly for transformers
CN1219977A (en) * 1996-07-12 1999-06-16 蒂森钢铁股份公司 Process for producing grain-orientated magnetic steel sheet
CN101603148A (en) * 2009-07-28 2009-12-16 首钢总公司 A kind of method of producing economic low-temperature heating oriented electrical steel
CN102127708A (en) * 2011-01-16 2011-07-20 首钢总公司 Method for producing oriented electrical steel by heating low-temperature slab
CN102686751A (en) * 2009-11-25 2012-09-19 塔塔钢铁艾默伊登有限责任公司 Process to manufacture grain-oriented electrical steel strip and grain-oriented electrical steel produced thereby
CN103911545A (en) * 2014-04-14 2014-07-09 国家电网公司 Preparation method of electrical steel strip with strong goss texture occupation rate and high magnetic induction orientation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1148411A (en) * 1995-03-14 1997-04-23 于西纳·萨西罗公司 Method for making a gain-oriented electric steel sheet, particularly for transformers
CN1219977A (en) * 1996-07-12 1999-06-16 蒂森钢铁股份公司 Process for producing grain-orientated magnetic steel sheet
CN101603148A (en) * 2009-07-28 2009-12-16 首钢总公司 A kind of method of producing economic low-temperature heating oriented electrical steel
CN102686751A (en) * 2009-11-25 2012-09-19 塔塔钢铁艾默伊登有限责任公司 Process to manufacture grain-oriented electrical steel strip and grain-oriented electrical steel produced thereby
CN102127708A (en) * 2011-01-16 2011-07-20 首钢总公司 Method for producing oriented electrical steel by heating low-temperature slab
CN103911545A (en) * 2014-04-14 2014-07-09 国家电网公司 Preparation method of electrical steel strip with strong goss texture occupation rate and high magnetic induction orientation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107723590A (en) * 2017-09-28 2018-02-23 马钢(集团)控股有限公司 A kind of transformer cold-rolled orientation electrical sheet and its production method
CN108486453A (en) * 2018-03-27 2018-09-04 东北大学 A kind of preparation method of low-iron loss high-magnetic strength non-oriented silicon steel plate
CN113174468A (en) * 2021-04-30 2021-07-27 福建省奥克兰光电科技有限公司 Two-stage annealing process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace
CN113174469A (en) * 2021-04-30 2021-07-27 福建省奥克兰光电科技有限公司 Energy-saving process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace

Similar Documents

Publication Publication Date Title
CN101768697B (en) Method for manufacturing oriented silicon steel with one-step cold rolling method
US10236105B2 (en) High magnetic induction oriented silicon steel and manufacturing method thereof
CN100381598C (en) Orientating silicon steel, manufacturing process and equipment
US9905361B2 (en) Manufacturing method of common grain-oriented silicon steel with high magnetic induction
CN104141092B (en) A kind of three-dimensional reel iron core transformer non-oriented electrical steel and production method thereof
JP2020183583A (en) Method of production of tin containing non grain-oriented silicon steel sheet, steel sheet obtained and use thereof
WO2015096430A1 (en) Method for preparing oriented high silicon electrical steel
CN106702260B (en) A kind of high-magnetic induction, low-iron loss non-orientation silicon steel and its production method
KR101512090B1 (en) Manufacture method of oriented silicon steel having good magnetic performance
CN102199721A (en) High-silicon non-oriented cold-rolled sheet, and manufacture method thereof
MX2013005804A (en) Method for producing directional electromagnetic steel sheet.
CN101787486B (en) Baking-aging resistant colored steel plate/strip and manufacturing method thereof
CN101654757A (en) Coated semi-processed non-oriented electrical steel sheet and manufacturing method thereof
CN107723591A (en) A kind of new-energy automobile motor cold rolling non-oriented electrical steel and its production method
CN102605267B (en) Low-temperature-heating technology-optimized high-magnetic-induction-orientation electric steel plate and production method thereof
CN104451378B (en) A kind of orientation silicon steel having excellent magnetic characteristics and production method
CN106048411A (en) Cold-rolled oriented electrical steel for transformer and production method of cold-rolled oriented electrical steel
CN105274427A (en) High-magnetic-induction oriented silicon steel and production method
CN103255274A (en) Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling
CN102560235A (en) Manufacturing method of high-magnetic-inductive oriented silicon steel
CN106048389A (en) Production method of non-oriented electrical steel 50W800 by traditional hot continuous rolling process
CN106119686A (en) A kind of cold rolling non-oriented electrical steel and production method thereof
CN109055861B (en) Low-iron-loss high-magnetic-induction oriented silicon steel strip and preparation method thereof
CN103667874A (en) Production method for shortening furnace time of oriented silicon steel during high-temperature annealing period
KR20170010445A (en) Oriented silicon steel and method for manufacturing same

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province

Applicant after: Ma'anshan Iron and Steel Co., Ltd.

Address before: 243003 Hunan Anhui West Road, No. 8 technology center, Intellectual Property Department

Applicant before: Ma'anshan Iron and Steel Co., Ltd.

CB02 Change of applicant information
CB02 Change of applicant information

Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui

Applicant after: Ma'anshan Iron and Steel Co., Ltd.

Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui

Applicant before: Ma'anshan Iron and Steel Co., Ltd.

CB02 Change of applicant information
RJ01 Rejection of invention patent application after publication

Application publication date: 20161026

RJ01 Rejection of invention patent application after publication