EP0429651B1 - Iron base, soft magnetic steel material - Google Patents

Iron base, soft magnetic steel material Download PDF

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Publication number
EP0429651B1
EP0429651B1 EP90900342A EP90900342A EP0429651B1 EP 0429651 B1 EP0429651 B1 EP 0429651B1 EP 90900342 A EP90900342 A EP 90900342A EP 90900342 A EP90900342 A EP 90900342A EP 0429651 B1 EP0429651 B1 EP 0429651B1
Authority
EP
European Patent Office
Prior art keywords
less
flux density
magnetic
magnetic flux
magnetization
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.)
Expired - Lifetime
Application number
EP90900342A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0429651A4 (en
EP0429651A1 (en
Inventor
Toshimichi Omori
Haruo Suzuki
Tetsuya Sanpei
Yasunobu Kunisada
Toshio Takano
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Publication of EP0429651A1 publication Critical patent/EP0429651A1/en
Publication of EP0429651A4 publication Critical patent/EP0429651A4/en
Application granted granted Critical
Publication of EP0429651B1 publication Critical patent/EP0429651B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • H01F1/147—Alloys characterised by their composition

Definitions

  • the present invention relates to soft magnetic ferrous materials, for instance, used as electromagnetic cores or magnetic shielding materials where good DC magnetization properties are required.
  • Soft irons or pure irons, permalloy or supermalloy have been used as DC electromagnetic iron cores, or magnetic shielding materials or medical appliances, physical machinery, electronic parts or appliances, which have recently been remarkable especially in their demand development.
  • a magnetic flux density at 1 Oe (called as “B1 value” hereinafter) of the soft iron or the pure iron is about 3000 to 11000 G. It has been used as the magnetic shielding materials or MRI (tomogram diagnosis apparatus by a nuclear magnetic resonance) or those shielding uo to a level around several gausses of magnetic flux, or as electromagnetic iron core materials.
  • the annealing brings about removal of lattice strain and the coarsening of the ferrite grains.
  • the improvement of the magnetic permeability of solute Al itself may be also considered, but by synergetic effects thereof, very excellent permeability may be provided;
  • a first invention is to offer soft magnetic ferrous materials of an iron base, composed of Al: 0.5 to 2.5 wt%, Si: not more than 1.0 wt%, C+N: not more than 0.007 wt%, Mn: not more than 0.5 wt%, oxygen: not more than 0.005 wt%, the rest being Fe and unavoidable impurities; having ferrite crystal grain diameter of not less than 0.5 mm, showing magnetic flux density in 0.5 Oe being not less than 11000 G, magnetic flux density in 25 Oe being not less than 15500 G, and a coercive force of not more than 0.4 Oe under a condition that lattice strains are all removed.
  • a second invention is to offer soft magnetic ferrous materials of an iron base, composed of Al: 0.5 to 2.5 wt%, Si: not more than 1.0 wt%, C+N: not more than 0.014 wt%, Mn: not more than 0.5 wt%, oxygen: not mroe than 0.005 wt%, Ti: 0.005 to 1.0 wt%, the rest being Fe and unavoidable impurities; having ferrite crystal grain diameters of not less than 0.5 mm, showing magnetic flux density in 0.5 Oe being not less than 11000 G, magnetic flux density in 25 Oe being not less than 15500 G, and a coercive force of not more than 0.4 Oe under a condition that lattice strains are all removed.
  • Fig.1 shows that the annealing is carried out under ordinary conditions at temperatures between 1000 and 1100°C, thereby to remove the lattice strains, and then a change of the DC magnetization property is taken as a change of B 0.5 value so as to study influences of C+N contents. According to this study, it is seen that the C+N content should be not more than 0.007 wt% for providing satisfactory properties. Thus C+N is determined to be not more than 0.007 wt% in the invention.
  • Ti is added as required which is a strong nitride former as said later. Ti addition is for decerasing the above said harms of N without severely specifying an upper limit of N, resulting in high costs. Therefore, in this case, the upper limit of C+N is determined to be 0.014 wt%.
  • Si contributes to the improvement of the magnetic permeability, but since coarse ferrite crystal grains of not less than 0.5 mm may be obtained by the Al addition after an annealing, the upper limit is 1.0 wt% for avoiding lowering of the saturated magnetization and the cost-up by much addition.
  • Mn deteriorates the DC magnetization property
  • lower content is desirable, but an extreme lowering causes the cost-up and the increase of N content.
  • this element also suppress a hot brittleness by fixing S. It may be contained 0.5 wt% as an upper limit within a range that the Mn/S ratio is not lower than 10.
  • Al is, as said above, the most important element of this invention. It brings about the fixing of the solute N, the coarsening of AlN, and the raising of the transformation temperature, and as results, thereby expands a ferrite phase region, so that this element accomplishes the coarsening of the ferrite grains and the decreasing of the lattice strain by the annealing. Furthermore, it is assumed that solute Al itself improves the DC magnetization proeprty. Thus, in the present invention, this element must be added for providing the excellent DC magnetization property. As is seen in Fig.2, such effect of Al may be obtained by adding not less than 0.5% in a value of sol.Al. On the other hand, it is undesirable to add exceedingly 2.5%, because B25 value is lowered by decreasing the saturated magnetization. Al addition is determined to be 0.5 to 2.5% in the value of sol.Al.
  • Ti is the strong nitride former as said above. If adding it 0.005 to 1.0%, it is possible to avoid considerable damages of the DC magnetization property by a fixing solute N even in such materials where N content is not fully decreased, that is, cheap materials. If the N content is relatively low, the generating amount of nitride is low, and the DC magnetization property may be expected to be improved more or less, accordingly. The Ti addition of more than the upper limit deteriorates the DC magnetization property.
  • ferrous materials may be produced which have the high B 0.5 value and B25 value, that is, the excellent soft magnetic properties in the DC magnetic field.
  • the ferrous materials of the invention include hot worked, cold worked and warm worked materials, and include these kinds of plates, sheets, bar, wire materials (shape steels, etc.), forged materials, and others.
  • the ferrous materils of the invention may be produced by the hot working process of cast pieces, the warm or cold working processes of as-cast pieces, the hot working followed by cold or warm working process, the direct-rolling process, the annealing (ordinarily not lower than 450°C) between the workings in the above respective processes, and others.
  • a final annealing is performed at the temperatures of ordinarily not lower than 900°C, preferably 1000 to 1300°C.
  • Table 1 shows chemical compositions of the inventive and comparative examples.
  • Steels B-G, J, L, N-T, V-X and Z belong to the composition of the invention, and Steels A, H, I, K, M, U, Y and a are the comparative examples.
  • Table 2 shows results that the steels of Table 1 were made ingots of 110 mm thickness after melted, hot rolled into thickness of 15 mm at a temperature of 1200°C, and measured, after the annealing, with respect to the DC magnetization properties and the ferrite crystal grain diameters. The annealings were performed under ordinary conditions of heating - holding time for 1 to 3 hours and cooling rates of 100°C/hr to 500°C/hr.
  • Nos.22 to 24, No.26 and No.27 studied influences of Ti additions. Since N was fixed by adding Ti, preferable properties were acknowledged.
  • No.23 is an inventive steel where Ti was added to a steel equivalent to No.11 (comparative steel).
  • No.26 is an inventive steel where Ti was added to a steel equivalent to No.25 (comparative steel). In each of them, in spite of C+N > 0.007%, N was fully fixed by Ti, and they were largely improved in comparison with the comparative ones of No.11 and No.25
  • Table 3 shows results that some steels of Table 1 were hot rolled, and cold rolled into thin sheets, and subjected to the ordinary annealings, and studied in the DC magnetization properties as in Table 2.
  • the cold reduction rates shown in the inventive examples and the comparative ones were 50 to 80%.
  • No.1 and No.2 were the comparative examples of Steel U, while Nos.3 to 6 were the inventive steels which reveal the desirable DC magnetization properties in comparison with the comparative examples of Nos.1 and 2.
  • the inventive steels have the desirable DC magnetization properties, and are all not less than 0.5 mm in the ferrite crystal grain diameters.
  • the soft magnetic ferrous materials of the invention have the excellent DC magnetization properties, and therefore may be easily magnetized even in very weak magnetic fields, and those are useful as iron cores of high function or magnetic shielding materials of high function.
  • the present invention may be applied to soft magnetic ferrous materials of iron base where the high DC magnetization properties such as an electromagnetic core and a magnetic shielding material are required.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
EP90900342A 1989-06-17 1989-12-08 Iron base, soft magnetic steel material Expired - Lifetime EP0429651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP155026/89 1989-06-17
JP1155026A JP2679258B2 (ja) 1989-06-17 1989-06-17 鉄基軟磁性鋼材

Publications (3)

Publication Number Publication Date
EP0429651A1 EP0429651A1 (en) 1991-06-05
EP0429651A4 EP0429651A4 (en) 1991-12-04
EP0429651B1 true EP0429651B1 (en) 1994-03-02

Family

ID=15597047

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900342A Expired - Lifetime EP0429651B1 (en) 1989-06-17 1989-12-08 Iron base, soft magnetic steel material

Country Status (7)

Country Link
EP (1) EP0429651B1 (ko)
JP (1) JP2679258B2 (ko)
KR (1) KR970004566B1 (ko)
CN (1) CN1026597C (ko)
CA (1) CA2020464A1 (ko)
DE (1) DE68913544T2 (ko)
WO (1) WO1990016076A1 (ko)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04265580A (ja) * 1991-02-20 1992-09-21 Fujitsu Ltd 磁気ディスク装置
JP2503125B2 (ja) * 1991-05-09 1996-06-05 新日本製鐵株式会社 良電磁厚板の製造方法
JP2503124B2 (ja) * 1991-05-09 1996-06-05 新日本製鐵株式会社 良電磁厚板の製造法
DE4293604C2 (de) * 1991-10-14 1997-04-03 Nippon Kokan Kk Weichmagnetisches Stahlmaterial und Verfahren zu seiner Herstellung
JPH0770715A (ja) * 1993-09-01 1995-03-14 Nkk Corp 耐歪み性に優れた軟磁性鋼材およびその製造方法
JPH0790505A (ja) * 1993-09-27 1995-04-04 Nkk Corp 軟磁性鋼材およびその製造方法
CN100334246C (zh) * 2004-05-28 2007-08-29 宝山钢铁股份有限公司 防伪造币钢及其生产方法
CN103789609A (zh) * 2014-02-13 2014-05-14 山西太钢不锈钢股份有限公司 一种电磁纯铁制造方法
CN104294150B (zh) * 2014-10-30 2016-05-18 武汉钢铁(集团)公司 屏蔽线用钢及其生产方法
KR101977507B1 (ko) * 2017-12-22 2019-05-10 주식회사 포스코 자기장 차폐용 강판 및 그 제조방법

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60207418A (ja) * 1984-03-30 1985-10-19 株式会社東芝 主回路の保護装置
JPS60208418A (ja) * 1984-03-30 1985-10-21 Sumitomo Metal Ind Ltd 高透磁率構造部材用厚鋼板の製造方法
JPS60208417A (ja) * 1984-03-30 1985-10-21 Sumitomo Metal Ind Ltd 高透磁率熱間圧延鉄板の製造方法

Also Published As

Publication number Publication date
WO1990016076A1 (en) 1990-12-27
DE68913544D1 (de) 1994-04-07
CN1048237A (zh) 1991-01-02
DE68913544T2 (de) 1994-07-21
CA2020464A1 (en) 1990-12-18
JPH0320447A (ja) 1991-01-29
EP0429651A4 (en) 1991-12-04
JP2679258B2 (ja) 1997-11-19
EP0429651A1 (en) 1991-06-05
CN1026597C (zh) 1994-11-16
KR970004566B1 (ko) 1997-03-29
KR920700458A (ko) 1992-02-19

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