GB852265A - Improvements in or relating to iron and ferrous alloys - Google Patents

Improvements in or relating to iron and ferrous alloys

Info

Publication number
GB852265A
GB852265A GB407858A GB407858A GB852265A GB 852265 A GB852265 A GB 852265A GB 407858 A GB407858 A GB 407858A GB 407858 A GB407858 A GB 407858A GB 852265 A GB852265 A GB 852265A
Authority
GB
United Kingdom
Prior art keywords
coating
article
annealing
iron
metal
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
Application number
GB407858A
Inventor
George Matthew Leak
David Alan Leak
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.)
British Iron and Steel Research Association BISRA
Original Assignee
British Iron and Steel Research Association BISRA
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 British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
Priority to GB407858A priority Critical patent/GB852265A/en
Publication of GB852265A publication Critical patent/GB852265A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets
    • H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/08—Extraction of nitrogen
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Electromagnetism (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

A method of reducing the nitrogen content of iron or ferrous alloy articles comprises coating the article with a layer of a nitrogen-accepting metal and annealing the article under such conditions that some or all of the nitrogen enters, and is retained by, the coating but prevents diffusion of the coating metal into the article. The coating layer may be removed after cooling. The coating metal may be Al, Cr, Ta, Ti, or V and may be applied electrolytically or by vapour deposition to a thickness depending on the thickness of the article and the desired reduction in nitrogen content. The annealing may comprise heating to 400 DEG C. to 800 DEG C. for two hours followed by cooling at a rate less than 100 DEG C. per hour. The coating metal may be applied prior to any mechanical working before annealing. Curves are given for Al coated on iron and show the relationship between the nitrogen content of the base and the thickness of coating on each side, and between the annealing time and the temperature.
GB407858A 1958-02-07 1958-02-07 Improvements in or relating to iron and ferrous alloys Expired GB852265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB407858A GB852265A (en) 1958-02-07 1958-02-07 Improvements in or relating to iron and ferrous alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB407858A GB852265A (en) 1958-02-07 1958-02-07 Improvements in or relating to iron and ferrous alloys

Publications (1)

Publication Number Publication Date
GB852265A true GB852265A (en) 1960-10-26

Family

ID=9770320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB407858A Expired GB852265A (en) 1958-02-07 1958-02-07 Improvements in or relating to iron and ferrous alloys

Country Status (1)

Country Link
GB (1) GB852265A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245402B (en) * 1961-12-01 1967-07-27 Konink Nl Hoogovens En Staalfa Process for removing free nitrogen from steel plates
WO2014180646A1 (en) * 2013-05-10 2014-11-13 Siemens Aktiengesellschaft Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245402B (en) * 1961-12-01 1967-07-27 Konink Nl Hoogovens En Staalfa Process for removing free nitrogen from steel plates
WO2014180646A1 (en) * 2013-05-10 2014-11-13 Siemens Aktiengesellschaft Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof
CN105190794A (en) * 2013-05-10 2015-12-23 西门子公司 Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof
AU2014264849B2 (en) * 2013-05-10 2016-10-13 Innomotics Gmbh Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof
RU2635501C2 (en) * 2013-05-10 2017-11-13 Сименс Акциенгезелльшафт Electrical steel sheet steel with insulation-improving coating and method of its production
US9959959B2 (en) 2013-05-10 2018-05-01 Siemens Aktiengesellschaft Magnetic steel sheet having a layer improving the electrical insulation and method for the production thereof
CN105190794B (en) * 2013-05-10 2018-12-07 西门子公司 Electrical sheet and its manufacturing method with the layer for improving electrical isolation

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