KR970043179A

KR970043179A - Manufacturing method of oriented electrical steel sheet with excellent magnetic and surface quality characteristics

Info

Publication number: KR970043179A
Application number: KR1019950053581A
Authority: KR
Inventors: 최규승
Original assignee: 김종진; 포항종합제철 주식회사
Priority date: 1995-12-21
Filing date: 1995-12-21
Publication date: 1997-07-26
Also published as: KR100241003B1

Abstract

본 발명은 변압기, 전동기, 발전기 및 기타 전자기기등의 철심재료로 사용되는 방향성 전기강판을 저온스라브 가열방식에 의해 제조하는 방법에 관한 것으로써, 표면용융이 없는 저온재가열 온도에서 처리후 열연한다는 열연판소둔을 행하여 미세석출물을 추가분산 석출시키고, 이후 최종마무리소둔시 전열사이클을 질소 함유수소 분위기에서 행하므로써, 표면산화물에 의한 유리질 절연피막의 형성이 유리하여 표면피막특성이 우수하고, 또한, 자기적 성질도 우수한 방향성 전기강판을 높은 생산성으로 제조할수 있는 방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method for manufacturing a grain-oriented electrical steel sheet used as iron core materials for transformers, electric motors, generators and other electronic devices by low temperature slab heating, and hot rolling after treatment at low temperature reheating temperature without surface melting. By performing plate annealing to further disperse and deposit fine precipitates, and then conducting a heat transfer cycle during the final finishing annealing in a nitrogen-containing hydrogen atmosphere, the formation of a glassy insulating film by surface oxides is advantageous, resulting in excellent surface coating properties and It is an object of the present invention to provide a method for manufacturing high-strength grain-oriented electrical steel sheet with high productivity.

저온스라브 가열방식에 의해 방향성 전기강판을 제조하는 방법에 있어서, 중량%로, C:0.025%-0.045%, Si:2.9-3.3%, P:0.015%이하, 용존Al:0.008-0.027%, N:0.0080 -0.012%, S:0.007%이하, Ni 및 Cr 단독 또는 복합:0.06-0.18%, Mn:0.32%이하, Cu:0.6%이하, 잔부 Fe 및 기타 불가피한 불순물로 조성되는 스라브를 1250-1320℃에서 재가열한 후 열간압연하고, 열연판을 1100-1150℃의 온도에서 소둔한 다음, 1차 냉간 압연하고, 냉연판을 820-870℃의 습윤분위기에서 탈탄소둔을 행한 다음, 50% 이상의 압연율로 2차 냉간압연한 후, 650℃이하의 온도에서 회복소둔을 행한 다음, MgO를 주성분으로 하는 융착방지제를 도포하고 권취한후, 1180-1220℃에서 분위기 가스를 10-15%질소함유 수소분위기로하여 20시간이상 최종 마무리 소둔을 행하여 자성 및 표면 품질특성이 우수한 방향성 전기강판의 제조방법을 그 요지로 한다.In the method for producing a grain-oriented electrical steel sheet by low temperature slab heating method, in weight%, C: 0.025% -0.045%, Si: 2.9-3.3%, P: 0.015% or less, dissolved Al: 0.008-0.027%, N : 0.0080 -0.012%, S: 0.007% or less, Ni and Cr alone or composite: 0.06-0.18%, Mn: 0.32% or less, Cu: 0.6% or less, slab composed of residual Fe and other unavoidable impurities 1250-1320 After reheating at ℃, hot rolling, the hot rolled sheet is annealed at a temperature of 1100-1150 ℃, first cold rolled, and the cold rolled sheet is subjected to decarbonization annealing in a wet atmosphere of 820-870 ℃, then 50% or more rolling After secondary cold rolling at a rate, recovery annealing was carried out at a temperature of 650 ° C. or lower, and then coated with a fusion inhibitor containing MgO as a main component and wound up, followed by 10-15% nitrogen-containing hydrogen at 1180-1220 ° C. A method of manufacturing a grain-oriented electrical steel sheet having excellent magnetic and surface quality characteristics by performing final finishing annealing for at least 20 hours in an atmosphere. It is decided.

Description

Manufacturing method of oriented electrical steel sheet with excellent magnetic and surface quality characteristics

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

Claims

In the method for producing a grain-oriented electrical steel sheet by low temperature slab heating method, in weight%, C: 0.025% -0.045%, Si: 2.9-3.3%, P: 0.015% or less, dissolved Al: 0.008-0.027%, N : 0.0080 -0.012%, S: 0.007% or less, Ni and Cr alone or composite: 0.06-0.18%, Mn: 0.32% or less, Cu: 0.6% or less, slab composed of residual Fe and other unavoidable impurities 1250-1320 After reheating at ℃, hot rolling, the hot rolled sheet is annealed at a temperature of 1100-1150 ℃, first cold rolled, and the cold rolled sheet is subjected to decarbonization annealing in a wet atmosphere of 820-870 ℃, then 50% or more rolling After secondary cold rolling at a rate, recovery annealing was carried out at a temperature of 650 ° C. or lower, and then coated with a fusion inhibitor containing MgO as a main component and wound up, followed by 10-15% nitrogen-containing hydrogen at 1180-1220 ° C. A grain-oriented electrical steel sheet with excellent magnetic and surface quality characteristics, characterized by performing final finishing annealing for at least 20 hours in an atmosphere. Manufacturing method.