KR970006520A

KR970006520A - Manufacturing method of cold rolled steel sheet for expansion vessel with excellent weldability and formability

Info

Publication number: KR970006520A
Application number: KR1019950023566A
Authority: KR
Inventors: 김일영; 박태엽; 오진택
Original assignee: 김만제; 포항종합제철 주식회사
Priority date: 1995-07-31
Filing date: 1995-07-31
Publication date: 1997-02-21
Also published as: KR100238012B1

Abstract

본 발명은 확관 가공하는 용기용 소재로 제관 용접 후 확관 시 용접부위에 크랙이 발생하지 않으며, 용접성 및 포밍성이 우수한 확관 용기용 냉연 강판의 제조 방법에 관한 것으로, 중량 비로, 탄소: 0.005% 이하, 망간 : 0.1~0.4%, 인 : 0.03% 이하, 황 : 6 0.015%, 알루미늄 : 0.06% 이하, 질소 : 0.004% 이하, 티타늄 : 0.03~0.05%, 고용 보론 : 0.005~0.0015%를 함유할 수 있도록 "[Ti]-1.5[S]≥3.43[N]"일 경우 보론 : 0.00065~0.0015%로 하고, "[Ti}-1.5[S]〈3.43"일 경우 보론 : (0.77{[N]-([Ti]-1.5[S]/3.43}+0.0005≤[B]≤(0.77{[N]-([Ti]-1.5[S])/3.43}+0.0015) 범위 내에서 관리하고 잔부 철 불가피하게 함유되는 불순물로 조성한 알루미늄 킬드강을 1200~1250℃의 온도 범위에서 균질화 처리한 후, 910℃ 부근에서 마무리 압연하고, 600~750℃ 부근 온도에서 권취한 다음, 압하율 80% 이상으로 냉간 압연하고, 720℃ 이상에서 연속 소둔한 후, 조질 압연을 행하여 제조하는 것을 특징으로 하는 용접성 및 성형성이 우수한 확관 용기용 냉연 강판의 제조 방법을 제공한다.The present invention relates to a method for manufacturing a cold rolled steel sheet for expansion vessels having excellent weldability and formability, wherein cracks do not occur in the welded portion after expansion of the steel tube as a material for expansion tube processing, and the carbon ratio is 0.005% or less. Manganese: 0.1 ~ 0.4%, phosphorus: 0.03% or less, sulfur: 6 0.015%, aluminum: 0.06% or less, nitrogen: 0.004% or less, titanium: 0.03 ~ 0.05%, solid boron: 0.005 ~ 0.0015% In case of "[Ti] -1.5 [S] ≥3.43 [N]" Boron: 0.00065 ~ 0.0015%, In case of "[Ti} -1.5 [S] <3.43" Boron: (0.77 {[N]-( [Ti] -1.5 [S] /3.43} + 0.0005≤ [B] ≤ (0.77 {[N]-([Ti] -1.5 [S]) / 3.43} +0.0015) After homogenizing the aluminum-kilted steel formed with the impurities contained in the temperature range of 1200 to 1250 ° C, finish rolling at around 910 ° C, winding it at a temperature around 600 to 750 ° C, and cold rolling to 80% or more of reduction ratio , Above 720 ℃ Provides in one after annealing, temper rolling method of manufacturing a cold-rolled steel sheet is performed for excellent weldability and formability, characterized in that for producing tube-expanding vessel.

Description

Manufacturing method of cold rolled steel sheet for expansion vessel with excellent weldability and formability

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

제1도는 비교강의 용접 부위를 확대한 현미경 사진, 제2도는 본 발명에 따른 발명강의 용접 부위를 확대한 현미경 사진이다.1 is an enlarged photomicrograph of a welded portion of the comparative steel, and FIG. 2 is an enlarged photomicrograph of a welded portion of the inventive steel according to the present invention.

Claims

By weight ratio, carbon (C): 0.005% or less, manganese (Mn): 0.1-0.4%, phosphorus (P): 0.03% or less, sulfur (S): 0.015%, aluminum (Sol-Al): 0.06% or less, "[Ti] -1.5 [S] ≥3.43" [N] days to contain nitrogen (N): 0.004% or less, titanium (Ti): 0.03-0.05%, solid solution boron (B): 0.0005-0.0015% Case Boron (B): (0.77 {[N]-([Ti] -1.5 [S] /3.43} + 0.0005≤ [B] ≤ (0.77 {[N]-([Ti] -1.5 [S]) / 3.43} +0.0015), and the aluminum-kilted steel, which is composed of the remaining iron (Fe) and inevitably contained impurities, is homogenized at a temperature range of 1200 to 1250 ° C, and then finish-rolled at around 910 ° C, and 600 to The cold rolled steel sheet for expansion vessel having excellent weldability and formability, which is cold rolled at a temperature of 750 ° C. and cold rolling at a reduction ratio of 80% or more, and continuously annealed at 720 ° C. or higher, is subjected to temper rolling. Manufacturing method.

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