KR960014371A

KR960014371A - Manufacturing method of cold rolled steel sheet with small earrings during drawing processing

Info

Publication number: KR960014371A
Application number: KR1019940027135A
Authority: KR
Inventors: 김일영; 조재홍; 이성호
Original assignee: 김만제; 포항종합제철 주식회사
Priority date: 1994-10-24
Filing date: 1994-10-24
Publication date: 1996-05-22
Also published as: KR0119560B1

Abstract

본 발명은 드로잉 용도에서 사용되는 냉간압연 강판을 제조하는 방법에 관한 것으로서, 제조조건을 각각의 범위로 제한하는 통상의 방법과 달리 각 제조조건이 합산된 △r의 희귀식을 적용함으로서 드로잉용도에서 가공시 이어링이 작게 생기는 냉연강판의 제조방법을 제공하고자 하는데 그 목적이 있다.The present invention relates to a method for manufacturing a cold rolled steel sheet used in drawing applications, and unlike the conventional method of limiting the manufacturing conditions to the respective ranges, by applying a rare formula of? An object of the present invention is to provide a method for manufacturing a cold rolled steel sheet in which earrings are small during processing.

본 발명은 중량%로 c : 0.02∼0.08%, Mn : 0.15∼0.40%, P : 0.03% 이하, S : 0.015% 이하, Al : 0.02∼0.06%, N : 0.004% 이하인 슬라브(SLAB)를 110℃ 이상에서 균질화 처리한후 △r=0.2(FT+CT)-0.04CCR+0.003 AST-28.34(FT : 연연 마무리온도, CT : 열연권취온도, CRR : 냉간압하율, AST : 소둔온도)의 모델식에서, 870∼910℃의 열연 마무리 압연온도, 550∼650℃의 열연 권취온도, 85∼92%의 냉간압하율 및 재결정 완료 온도이상의 소둔온도 범위내에서 △r이 ‘0’에 가깝도록 만족하는 상기 조건으로 열간압연, 냉간압연, 및 연속소둔작업을 실시하는 것을 특징으로 하는 드로잉 가공시 이어링이 작은 냉연강판의 제조방법을 그 요지로 한다.In the present invention, a slab (SLAB) having a weight ratio of c: 0.02 to 0.08%, Mn: 0.15 to 0.40%, P: 0.03% or less, S: 0.015% or less, Al: 0.02 to 0.06%, N: 0.004% or less is 110 △ r = 0.2 (FT + CT) -0.04CCR + 0.003 AST-28.34 (FT: Rolling Finish Temperature, CT: Hot Rolling Temperature, CRR: Cold Rolling Rate, AST: Annealing Temperature) In the formula, it is satisfied that Δr is close to '0' within the hot rolling finish rolling temperature of 870 to 910 ° C, hot rolling winding temperature of 550 to 650 ° C, cold rolling reduction of 85 to 92% and annealing temperature above the recrystallization completion temperature. The present invention is directed to a method for producing a cold rolled steel sheet having a small earing during drawing processing, characterized in that hot rolling, cold rolling, and continuous annealing are performed under the above conditions.

Description

Manufacturing method of cold rolled steel sheet with small earrings during drawing processing

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 이어(ear)발생도,1 is the ear (ear) occurrence degree,

제2도는 △r과 이어높이와의 관계도,2 is a relationship between Δr and ear height,

제3도는 열연마무리 압연온도와 △r과의 상관관계도,3 is a correlation diagram between hot finish rolling temperature and Δr,

제4도는 권취온도와 △r과의 상관관계도.4 is a correlation diagram between winding temperature and Δr.

Claims

Slabs of C: 0.02 to 0.08%, Mn: 0.15 to 0.40%, P: 0.03% or less, S: 0.015% or less, Al: 0.02 to 0.06%, N: 0.004% or less at 1100 ° C or more After homogenization, in the model formula of △ r = 0.02 (FT + CT) -0.04CCR + 0.003AST-28.34 (FT: hot rolling finish temperature, CT: hot roll winding temperature, CRR: cold rolling rate, AST: annealing temperature) The above condition that satisfies Δr to be close to '0' within the hot rolling finish rolling temperature of 870 to 910 ° C, hot rolling winding temperature of 550 to 650 ° C, cold rolling rate of 85 to 92%, and annealing temperature above recrystallization completion temperature. Hot rolling, cold rolling, and continuous annealing operations for the production of cold rolled steel sheets having small earrings during drawing processing, characterized in that for performing.

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