Manufacturing method of grain oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, applied in manufacturing tools, inorganic material magnetism, furnace and other directions, can solve the problems of poor magnetic properties, insufficient control of solid solution elements, insufficient fine precipitation of inhibitors, etc. cost-increasing effect

Active Publication Date: 2018-01-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, although this method contains inhibitor elements such as Al and N, since the slab is not heated at a high temperature, the fine precipitation of the inhibitor is insufficient, and the primary regrain growth inhibitory force is insufficient, and the magnetic properties still deteriorate.
In addition, there are no restrictions on the cooling conditions after annealing before final cold rolling, and the control of the amount of solid solution elements (C, N, etc.) is insufficient

Method used

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  • Manufacturing method of grain oriented electrical steel sheet
  • Manufacturing method of grain oriented electrical steel sheet
  • Manufacturing method of grain oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] A steel slab having the composition shown in Table 1 was heated to 1180° C., and then hot rolled to a thickness of 2.3 mm. Next, after annealing the hot-rolled sheet at 1020°C for 60 seconds, cooling at an average cooling rate of 40°C / s between 800°C and 200°C, and then cold rolling to a thickness of 0.23mm, and then in a wet hydrogen-nitrogen mixed gas Primary recrystallization annealing was performed at 820° C. for 120 seconds in the atmosphere. The rate of temperature increase between 500°C and 700°C during the primary recrystallization annealing was 20°C / sec.

[0132] Next, an annealing separator mainly composed of MgO is coated on the surface of the steel sheet, and then secondary recrystallization annealing is performed at 1180°C for 50 hours as a cleaning annealing, and then a phosphate-based insulating tension coating is applied and Baking and flattening annealing for the purpose of flattening the steel strip were performed to produce products.

[0133] The magn...

Embodiment 2

[0137] Billets No. 3 and No. 4 in Table 1 were heated to 1220 °C and then hot rolled to various thicknesses shown in Table 2. Next, after annealing the hot-rolled sheet at 1050°C for 30 seconds, cooling at an average cooling rate of 20°C / s between 800°C and 200°C, and then cold-rolling to a thickness of 0.20mm, and then cooling in a wet hydrogen-nitrogen mixed gas Primary recrystallization annealing was performed at 820° C. for 120 seconds in the atmosphere. The rate of temperature increase between 500°C and 700°C during the primary recrystallization annealing was 30°C / sec.

[0138] Next, an annealing separator is coated on the surface of the steel sheet, and MgO and 10 parts by mass of MgSO are added to 100 parts by mass of MgO in the annealing separator. 4 , and then perform secondary recrystallization annealing that doubles as cleaning annealing at 1180°C for 50 hours, and then apply a phosphate-based insulating tension coating and bake it, and flattening annealing for the...

Embodiment 3

[0143] Steel slabs containing various compositions shown in Table 3 were heated to 1220° C., and then hot rolled to a thickness of 2.7 mm. Next, it is rolled to an intermediate thickness of 2.2mm by the first cold rolling, and then intermediate annealing is performed at 950°C for 60 seconds, and then cooled at an average cooling rate of 40°C / sec between 800°C and 200°C, and then passed through the second pass. After cold rolling twice to a final thickness of 0.23 mm, primary recrystallization annealing was performed at 840° C. for 10 seconds. The rate of temperature increase between 500°C and 700°C during the primary recrystallization annealing was 40°C / sec.

[0144] Then, nitriding treatment was performed at 600° C. for 3 minutes in a cyanate bath. Next, an annealing separator mainly composed of MgO is coated on the surface of the steel sheet, and secondary recrystallization annealing is performed at 1200°C for 50 hours, which is also used as a cleaning annealing, and then a...

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Abstract

Provides is a method of producing a grain oriented electrical steel sheet by heating a steel slab having a composition containing by mass% C: 0.0005 % to 0.005 %, Si: 2.0 % to 4.5 %, Mn: 0.005 % to 0.3 %, S and / or Se (in total): 0.05 % or less, sol.Al: 0.010 % to 0.04 %, N: 0.005 % or less, the balance being Fe and incidental impurities, then subjecting the slab to hot rolling to obtain a hot rolled sheet, then optionally subjecting the hot rolled sheet to hot band annealing and subsequent cold rolling once, or twice or more with intermediate annealing performed therebetween to obtain a cold rolled sheet with final sheet thickness, then subjecting the cold rolled sheet to primary recrystallization annealing and subsequent secondary recrystallization annealing, in which the aging index AI of the steel sheet before final cold rolling is set to 70 MPa or less to effectively grow Goss-oriented grains to thereby obtain a grain-oriented electrical steel sheet with good magnetic properties, without the restriction of containing a relatively large amount of C.

Description

technical field [0001] The present invention relates to a method for producing a so-called grain-oriented electrical steel sheet in which crystal grains are concentrated on {110} planes on the sheet surface and <001> orientation in the rolling direction in terms of Miller indices. Grain-oriented electrical steel sheets are soft magnetic materials and are mainly used as iron cores for electrical equipment such as transformers. Background technique [0002] It is well known that grain-oriented electrical steel sheets are concentrated in the {110}<001> orientation (hereinafter referred to as Goss (Goss) orientation) through secondary recrystallization annealing, thereby exhibiting excellent magnetic properties (for example, refer to patent Literature 1). [0003] Therefore, as an index of magnetic properties, the magnetic flux density B at a magnetic field strength of 800A / m is mainly used 8 And the iron loss W per 1kg steel plate when magnetized to 1.7T in an AC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C22C38/00C22C38/02C22C38/60H01F1/16
CPCC21D1/34C21D8/1222C21D8/1233C21D8/1261C21D8/1272C21D9/46C21D2201/05C22C38/00C22C38/001C22C38/002C22C38/004C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/34C22C38/44C22C38/46C22C38/60H01F1/16C21D8/12C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0273C23C8/26
Inventor 竹中雅纪今村猛早川康之新垣之启
Owner JFE STEEL CORP
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