KR960007799A

KR960007799A - Manufacturing method of oriented electrical steel sheet

Info

Publication number: KR960007799A
Application number: KR1019940021391A
Authority: KR
Inventors: 최규승; 이청산
Original assignee: 김만제; 포항종합제철 주식회사; 신창식; 재단법인 산업과학기술연구소
Priority date: 1994-08-29
Filing date: 1994-08-29
Publication date: 1996-03-22
Also published as: KR970007033B1

Abstract

본 발명은 변압기, 전동기, 발전기 및 기타 전자기기등의 철심재료로 사용되는 방향성 전기강판의 제조방법에 관한 것으로써 최종 고온소둔 공정의 승온속도를 제어함에 의해 냉각압연 후의 회복소둔 공정 자체를 생략하더라도 안정적이고 통상재에비해 동등 또는 그 이상의 우수한 자기적 특성을 확보할수 있는 방향성 전기강판을 제공하고자 하는데 그 목적이 있다.본 발명은 중량%로 C;0.035-0.050%, Si;2.9-3.3%, P:0.15% 이하, 용존 Al:0.011-0.017%, N:0.008-0.012%, S:0.007%, 이하 Ni과 Cr의 단독 또는 복합:0.06-0.18%, Mn:0.32%이하 Cu:0.6%이하 잔부 Fe 및 기타 불가피한 불순물 조성되는 강 슬라브를 1250-1320℃의 온도구간에서 재가열하여 열간압연한후 이후 열연판 소둔을 행하지 않고 중간의 820-870℃에서의 탈탄소둔을 포함한 2회의 냉간압연에 의해 최종두께로 조정한 다음 증간회복소둔 및 MgO를 주성분으로 하는 소둔분리제를 도포한 후 150-1200℃에서 최종 마무리 고온소둔 처리를 행하여 방향성 전기강판을 제조하는 방법에 있어서 상기한 중간 회복소둔을 생략하고 그 대신에 상기 최종 마무리고운소둔시 400-700℃에서의 승온속도를 50℃/hr 이하로 유지하는 것을 특징으로 하는 방향성 전기강판의 제조방법.The present invention relates to a method for manufacturing a grain-oriented electrical steel sheet used as iron core materials such as transformers, electric motors, generators and other electronic devices, even if the recovery annealing process itself after cold rolling is omitted by controlling the temperature rising rate of the final high temperature annealing process. It is an object of the present invention to provide a grain-oriented electrical steel sheet which is stable and has excellent magnetic properties equivalent to or higher than that of ordinary materials. The present invention provides a weight% of C; 0.035-0.050%, Si; 2.9-3.3%, P: 0.15% or less, dissolved Al: 0.011-0.017%, N: 0.008-0.012%, S: 0.007%, or less Ni or Cr alone or in combination: 0.06-0.18%, Mn: 0.32% or less Cu: 0.6% or less Residual Fe and Other Unavoidable Impurities Steel slabs composed of impurity are reheated in a temperature range of 1250-1320 ° C and hot rolled, and then subjected to two cold rolling including decarbonization annealing at 820-870 ° C without performing annealing. After adjusting to the final thickness In the method for producing a grain-oriented electrical steel sheet by applying a simple recovery annealing and an annealing separator mainly composed of MgO, and then performing a final finishing high temperature annealing treatment at 150-1200 ° C., the above-mentioned intermediate recovery annealing may be omitted and the final A method for producing a grain-oriented electrical steel sheet characterized by maintaining a temperature increase rate at 400-700 ° C or less during finishing fine annealing.

Description

Manufacturing method of oriented electrical steel sheet

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

Claims

By weight% C; 0.035-0.050%, Si; 2.9-3.3%, P: 0.015% or less, dissolved Al: 0.011-0.017%, N: 0.008-0.012%, S: 0.007%, hereinafter Ni and Cr alone or Composite: 0.06-0.18%, Mn: 0.32% or less Cu: 0.6% or less Residual Fe and other unavoidable impurities Steel slab composed of reheated at a temperature range of 1250-1320 ° C, hot rolled, and then not hot-annealed Adjust to final thickness by two cold rolling including decarbonization annealing at 820-870 ℃, apply intermediate recovery annealing and annealing separator mainly composed of MgO, and then finish high temperature annealing treatment at 1150-1200 ℃. In the method for producing a grain-oriented electrical steel sheet, the above-mentioned intermediate recovery annealing is omitted, and instead, the heating rate at 400-700 ° C. is maintained at 50 ° C./hr or less during the final finishing fine annealing. Method of manufacturing steel sheet.

※ Note: The disclosure is based on the initial application.