GB825620A - Improvements in or relating to methods of treating silicon-iron alloys - Google Patents

Improvements in or relating to methods of treating silicon-iron alloys

Info

Publication number
GB825620A
GB825620A GB13609/58A GB1360958A GB825620A GB 825620 A GB825620 A GB 825620A GB 13609/58 A GB13609/58 A GB 13609/58A GB 1360958 A GB1360958 A GB 1360958A GB 825620 A GB825620 A GB 825620A
Authority
GB
United Kingdom
Prior art keywords
heat treatment
cold deformation
carried out
additional
iron alloys
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
GB13609/58A
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of GB825620A publication Critical patent/GB825620A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1266—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest between cold rolling steps
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

In the method of heat treating silicon iron alloys as described in the parent Specification, between the cold deformations there are intervening heat treatments at least one of which is carried out at a temperature exceeding 950 DEG C. (1000-1350 DEG C.). This one intervening heat treatment may be carried out either in a vacuum with a pressure of 10-2-10-4 mm. mercury, or in an atmosphere containing at least 50% hydrogen, possibly immediately before the last cold deformation but preferably immediately before the penultimate cold deformation. The percentage reduction of the section of the workpiece produced by the last cold deformation may be greater than that produced by the penultimate cold deformation. The final heat treatment may be preceded by an additional heat treatment the duration (at least 10 minutes) and temperature (500-800 DEG C.) of which are such that more than 90% complete primary recrystallization takes place with less than 10% secondary recrystallization with cubic texture. This additional heat treatment may be carried out in an atmosphere which is non-oxidizing, or only gently oxidizing, or containing hydrogen, and the workpiece may or may not be cooled to room temperature between the additional and final heat treatments.
GB13609/58A 1957-07-02 1958-04-29 Improvements in or relating to methods of treating silicon-iron alloys Expired GB825620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE825620X 1957-07-02

Publications (1)

Publication Number Publication Date
GB825620A true GB825620A (en) 1959-12-16

Family

ID=6747592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13609/58A Expired GB825620A (en) 1957-07-02 1958-04-29 Improvements in or relating to methods of treating silicon-iron alloys

Country Status (1)

Country Link
GB (1) GB825620A (en)

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