Method for producing oriented electromagnetic steel sheet
US-2015007908-A1 · Jan 8, 2015 · US
Method of producing grain-oriented electrical steel sheet
US9640320B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9640320-B2 |
| Application number | US-201214235652-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 8, 2012 |
| Priority date | Aug 12, 2011 |
| Publication date | May 2, 2017 |
| Grant date | May 2, 2017 |
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Abstract
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In a method of producing a grain-oriented electrical steel sheet by subjecting a coil for grain-oriented electrical steel sheet after cold rolling to a primary recrystallization annealing, applying an annealing separator thereon, and conducting final annealing, rapid heating is conducted at a rate of not less than 80° C./sec from 500° C. to 700° C. in the course of heating for the primary recrystallization annealing, and a temperature keeping treatment is conducted for 2 to 100 hours from 700° C. to 1000° C. in the course of heating for the final annealing, and further, the final annealing is preferably conducted by laying a thermal insulation material on an upper surface of a coil supporting stand in an annealing furnace used for the final annealing concentrically from the outer periphery of the coil supporting stand and over an area of not less than 20% of the radius of the coil supporting stand.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of producing a grain-oriented electrical steel sheet having forsterite film by subjecting a coil for grain-oriented electrical steel sheet after cold rolling to a primary recrystallization annealing, applying an annealing separation agent composed mainly of MgO thereon, and conducting final annealing, wherein for the primary recrystallization annealing rapid heating is conducted at a rate of not less than 80° C./sec from 500° C. to 700° C., and for the final annealing a temperature keeping treatment is conducted for 2 to 100 hours by maintaining a constant keeping temperature from 700° C. to 1000° C. and subsequently the temperature is raised up to 1180° C. or more and then kept at a constant temperature, and wherein the shape defect rate is 2.8% or less. 2. The method of producing a grain-oriented electrical steel sheet according to claim 1 , wherein the final annealing is conducted by laying a thermal insulation material on an upper surface of a coil supporting stand in an annealing furnace used for the final annealing concentrically from the outer periphery of the coil supporting stand and over an area of 20-80% of the radius of the coil supporting stand. 3. The method of producing a grain-oriented electrical steel sheet according to claim 1 , wherein the rapid heating in the primary recrystallization annealing is conducted by another heat treatment preceding the primary recrystallization annealing. 4. The method of producing a grain-oriented electrical steel sheet according to claim 2 , wherein the rapid heating in the primary recrystallization annealing is conducted by another heat treatment preceding the primary recrystallization annealing.
Assignees
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Classifications
- C22C38/00Primary
Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title
Heat treatment of ferrous alloys · CPC title
for sheet metals · CPC title
between cold rolling steps · CPC title
Final recrystallisation annealing · CPC title
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- What does patent US9640320B2 cover?
- In a method of producing a grain-oriented electrical steel sheet by subjecting a coil for grain-oriented electrical steel sheet after cold rolling to a primary recrystallization annealing, applying an annealing separator thereon, and conducting final annealing, rapid heating is conducted at a rate of not less than 80° C./sec from 500° C. to 700° C. in the course of heating for the primary recry…
- Who is the assignee on this patent?
- Watanabe Makoto, Shingaki Yukihiro, Takamiya Toshito, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C22C38/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 02 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).