EP2530173A1 - Verfahren zur verbesserung des oberflächengrobkorns von nicht ausgerichteten siliciumstahl - Google Patents

Verfahren zur verbesserung des oberflächengrobkorns von nicht ausgerichteten siliciumstahl Download PDF

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Publication number
EP2530173A1
EP2530173A1 EP11819314A EP11819314A EP2530173A1 EP 2530173 A1 EP2530173 A1 EP 2530173A1 EP 11819314 A EP11819314 A EP 11819314A EP 11819314 A EP11819314 A EP 11819314A EP 2530173 A1 EP2530173 A1 EP 2530173A1
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EP
European Patent Office
Prior art keywords
oriented silicon
steel
controlled
silicon steel
crystal grains
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.)
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Application number
EP11819314A
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English (en)
French (fr)
Inventor
Lingfeng Chen
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Publication date
Application filed by Baoshan Iron and Steel Co Ltd filed Critical Baoshan Iron and Steel Co Ltd
Publication of EP2530173A1 publication Critical patent/EP2530173A1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • 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
    • C21D1/28—Normalising

Definitions

  • This invention relates generally to a manufacture process of non-oriented silicon steel, and particularly, to a method for fining coarse crystal grains at surface of non-oriented silicon steel.
  • composition contents of existing non-oriented silicon steel products are: C ⁇ 0.005%, Si: 0.1% ⁇ 1.8%, Mn: 0.10% ⁇ 0.80%, P: 0.04% or less, A1: 0.20% ⁇ 0.80%, S ⁇ 0.005%, N ⁇ 0.005%, the rest is Fe and unavoidable inclusions.
  • the above compositions of molten steel are obtained through smelting in a converter and RH refining treatment. After the molten steel is casted into billets and the billets are successively hot-rolled, normalized, pickled, cold-rolled, annealed and coated, products of non-oriented silicon steel are then obtained. Surface quality of the products is often poor, as shown by Figure 1 , which have severe coarse crystal grains at the surface.
  • Chinese patent CN1073982 disclosed a pre-treatment process of "duplex preheating and normalizing" for forgings, which solves the problems that the existing process is incapable of fully fining crystal grains and of clearly improving coarse grains and mixed grains. It includes preheat and normalization procedures, features of which lie in that forgings are preheated to a temperature of 600 ⁇ 710 ⁇ prior to being normalized. Features of the process lie in that (1) coarse crystal grains are fined; (2) coarse grains and mixed grains are fined to meet relevant technical specifications; and (3) it can be implemented by using existing devices. However, this process might be applied to preliminary heat treatment of large-scale forgings. If coiled sheets of non-oriented silicon steel are subject to this process, an additional heat treatment procedure would be required and cost would be increased.
  • Chinese patent CN1804056 disclosed "a method for preventing low-multiple coarse crystal grains of transformable high temperature alloys", which includes two groups of measures.
  • the first group is preventive measures of forging process, which conducts computerized simulation by use of commercial simulation software DEFORM2D so as to determine the deformation in the min-deformable portion of a high temperature alloy forging, and to strictly control the deformation caused by recrystallization generated in the effectively deformed portions in a single heating.
  • the second group is preventive measures of preparative heat treatment, which strictly hold heating temperature for smithing below 1160 ⁇ , the measures in the second group are used when the measures in the first group do not work successfully or some accidents occur.
  • the production process developed by this invention can make low-multiple coarse crystal grains of the products manufactured of transformable high temperature alloys attain to a qualified grade, and is mainly used for hydraulic pressing deformation and hammer smithing deformation of conventional high temperature alloys. It is not suitable for normalization treatment of non-oriented silicon steel sheets because coiled sheets of non-oriented silicon steel cannot be heat-treated to be deformed by pressing or smithing while being normalized.
  • the material can obtain complete fine crystal grain texture after being quenching and tempering treated, so that defects of coarse crystal grains of steel 20Cr1Mo1VNbTiB can be solved.
  • the process cannot solve coarse crystal grains problem that generate in the normalization process of non-oriented silicon steel.
  • the above three methods are not suitable for normalized non-oriented silicon steel products, and the main reason is that the non-oriented silicon steel products can not be hot worked to be deformed while being normalized; if of the twice heat treatment to fine grain size of crystal grains is performed, cost will rise.
  • the object of the invention is to provide a method for fining coarse crystal grains at surface of non-oriented silicon steel.
  • This method under existing conditions, might fine the coarse crystal grains at the surface of non-oriented silicon steel without addition of heat treatment procedure and without a parallel hot-working, and might have surface quality of the non-oriented silicon steel meeting relevant requirements, without any influence on electromagnetic property of non-oriented silicon steel.
  • the method provided by the invention is:
  • compositions of a non-oriented silicon steel, by weight percent are: C: 0.001% ⁇ 0.005%, Si: 0.1% ⁇ 1.8%, Mn: 0.10% ⁇ 0.80%, P ⁇ 0.04%, A1: 0.20% ⁇ 0.80%, S ⁇ 0.005%, N ⁇ 0.005, and the rest being Fe and unavoidable inclusions;
  • molten steel in accordance with the above compositions is smelted, RH refining treated, and then casted into a steel billet;
  • normalizing temperature is controlled at 800 ⁇ 900°C
  • normalization soaking period is controlled at 15 ⁇ 30S
  • oxygen content in normalization furnace is controlled at 0.5% or less
  • a ratio of maximum grain size to average grain size in the normalized steel sheet is controlled below 3;
  • the ratio of the maximum grain size to average grain size in the normalized steel sheet is controlled below 2.
  • the invention normalizes the steel sheet, wherein normalizing temperature is controlled at 800 ⁇ 900°C, and normalization soaking period is controlled at 15 ⁇ 30S. If the normalizing temperature is too high and the soaking period is too long, crystal grains will unusually grow up, severe coarse crystal grains defect will occur after cold-rolling and annealing process. Contrarily, if the normalizing temperature is too low and the soaking period is too short, then the post-rolled deformed texture caused by rolling cannot re-crystallize into fine grains, and so corrugation-like defects will occur, which simultaneously deteriorates magnetic induction property.
  • the ratio of maximum grain size to average grain size in the normalized steel sheet shall be controlled less than 3. If this ratio is too high, it trends to cause coarse crystal grains to generate at the surfaces. Preferably, this ratio is controlled less than 2.
  • Oxygen content in the normalization furnace shall be controlled below 0.5%. Excessive oxygen content will result in increment of surface oxide layer, which increases difficulty for pickling and influences surface quality.
  • the invention does not utilize twice heat treatments, so that operation of the invention is simple and t energy-saving;
  • the invention can effectively improve surface quality of the non-oriented silicon steel sheet by the normalizing process, so as to effectively eliminate defects of coarse crystal grains at surface of the non-oriented silicon steel products.
  • Fig. 1 is a metallographic photo of coarse crystal grains at the surface of a finished steel product as a comparative object
  • Fig. 2 is a metallographic photo of coarse crystal grains at the surface of a finished non-oriented silicon steel product of an embodiment of the invention.
  • Figs 1 and 2 show metallographic textures at the surface of a steel product as a comparative object and at the surface of the cold-rolled non-oriented silicon steel sheet, respectively.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP11819314A 2010-08-26 2011-04-27 Verfahren zur verbesserung des oberflächengrobkorns von nicht ausgerichteten siliciumstahl Withdrawn EP2530173A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010102657823A CN102373366A (zh) 2010-08-26 2010-08-26 一种改善无取向硅钢表面粗晶的方法
PCT/CN2011/073358 WO2012024939A1 (zh) 2010-08-26 2011-04-27 一种改善无取向硅钢表面粗晶的方法

Publications (1)

Publication Number Publication Date
EP2530173A1 true EP2530173A1 (de) 2012-12-05

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EP11819314A Withdrawn EP2530173A1 (de) 2010-08-26 2011-04-27 Verfahren zur verbesserung des oberflächengrobkorns von nicht ausgerichteten siliciumstahl

Country Status (6)

Country Link
EP (1) EP2530173A1 (de)
JP (1) JP2013517380A (de)
CN (1) CN102373366A (de)
MX (1) MX2012010150A (de)
RU (1) RU2012136591A (de)
WO (1) WO2012024939A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10385414B2 (en) 2012-03-26 2019-08-20 Baoshan Iron & Steel Co., Ltd. Non-oriented silicon steel and its manufacturing method

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CN103305745B (zh) * 2012-03-09 2016-04-27 宝山钢铁股份有限公司 一种高质量硅钢常化基板的生产方法
CN103255274B (zh) * 2012-08-10 2015-06-03 新万鑫（福建）精密薄板有限公司 一般取向硅钢由两次冷轧改为一次冷轧的生产方法
CN103667879B (zh) * 2013-11-27 2016-05-25 武汉钢铁(集团)公司 磁性能和机械性能优良的无取向电工钢及生产方法
CN105779731A (zh) * 2014-12-23 2016-07-20 鞍钢股份有限公司 提高低牌号无取向电工钢电磁性能的热轧板常化工艺
CN105925884B (zh) * 2016-05-30 2018-03-09 宝山钢铁股份有限公司 一种高磁感、低铁损无取向硅钢片及其制造方法
CN106676237B (zh) * 2016-12-14 2018-08-10 北京首钢股份有限公司 一种消除无取向电工钢表面裂纹缺陷的方法
CN112063819A (zh) * 2020-09-11 2020-12-11 马鞍山钢铁股份有限公司 一种高屈强比无取向硅钢及其制造方法
KR102438474B1 (ko) * 2020-12-21 2022-09-01 주식회사 포스코 무방향성 전기강판 및 그 제조방법
CN113403455B (zh) * 2021-06-17 2024-03-19 张家港扬子江冷轧板有限公司 无取向硅钢的生产方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10385414B2 (en) 2012-03-26 2019-08-20 Baoshan Iron & Steel Co., Ltd. Non-oriented silicon steel and its manufacturing method

Also Published As

Publication number Publication date
WO2012024939A1 (zh) 2012-03-01
JP2013517380A (ja) 2013-05-16
CN102373366A (zh) 2012-03-14
RU2012136591A (ru) 2014-02-27
MX2012010150A (es) 2013-01-22

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