KR950008708A - Manufacturing method of ultra-high strength cold rolled steel sheet with excellent spot weldability and press workability - Google Patents

Manufacturing method of ultra-high strength cold rolled steel sheet with excellent spot weldability and press workability Download PDF

Info

Publication number
KR950008708A
KR950008708A KR1019930018897A KR930018897A KR950008708A KR 950008708 A KR950008708 A KR 950008708A KR 1019930018897 A KR1019930018897 A KR 1019930018897A KR 930018897 A KR930018897 A KR 930018897A KR 950008708 A KR950008708 A KR 950008708A
Authority
KR
South Korea
Prior art keywords
cold rolled
steel sheet
high strength
rolled steel
ultra
Prior art date
Application number
KR1019930018897A
Other languages
Korean (ko)
Other versions
KR950007784B1 (en
Inventor
김재익
김종화
Original Assignee
조말수
포항종합제절 주식회사
백덕현
재단법인산업과학 기술연구소
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 조말수, 포항종합제절 주식회사, 백덕현, 재단법인산업과학 기술연구소 filed Critical 조말수
Priority to KR1019930018897A priority Critical patent/KR950007784B1/en
Publication of KR950008708A publication Critical patent/KR950008708A/en
Application granted granted Critical
Publication of KR950007784B1 publication Critical patent/KR950007784B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

본 발명은 자동차등의 보강재용으로 사용되는 초고강도 냉연강판을 제조하는 방법에 관한 것으로써, 종래의 고강도냉연강판에 비하여 동일강도수준에서 탄소당량을 낮추므로써 점용접성을 개선시킬 뿐만 아니라 높은 연성을 가지도록 함으로써 프레스 가공성을 향상 시킨 초고강도 냉연강판의 제조방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method for manufacturing an ultra high strength cold rolled steel sheet used for reinforcing materials such as automobiles, and improves spot weldability as well as high ductility by lowering the carbon equivalent at the same strength level as compared with the conventional high strength cold rolled steel sheet. The purpose of the present invention is to provide a method for manufacturing an ultra-high strength cold rolled steel sheet having improved press formability.

본 발명은 초고강도 냉연강판을 제조하는 방법에 있어서, 중량%로 C : 0.10~0.20%, Si : 0.6~1.6%, Mn : 1.0~2.0%, Mo : 0.10~0.30%, Nb : 0.02~0.1%, N : 0.007%이하, 전부 Fe 및 기타 불가피한 불순물로 조성되고, 탄소당량(Ceq) (Ceq=C=Si/30+Mn/20+2P+4S)이 0.35이하인 알루미늄킬드(Al-Killed)강을 1200~1250℃에서 균열처리한후, 통상의 방법으로 열간압연한뒤 400~600℃에서 권취한 다음, 30~80%의 냉강압하율로 냉강압연한후, 연속소둔 방법에 의해 740~860℃에서 20~120초동안 균열한후, 500~300℃온도구간에서 과시효 처리하는 것을 특징으로 하는 점용접성 및 프레스가공성이 우수한 초공강도 냉연강판을 제조하는 방법을 그 요지로 한다.The present invention is a method for producing an ultra-high strength cold rolled steel sheet, by weight% C: 0.10 to 0.20%, Si: 0.6 to 1.6%, Mn: 1.0 to 2.0%, Mo: 0.10 to 0.30%, Nb: 0.02 to 0.1 %, N: 0.007% or less, all made of Fe and other inevitable impurities, and carbon equivalent (Ceq) (Ceq = C = Si / 30 + Mn / 20 + 2P + 4S) is less than 0.35 Al-Killed After the steel is cracked at 1200 ~ 1250 ℃, hot rolled by the usual method, wound at 400 ~ 600 ℃, cold rolled at 30 ~ 80% cold reduction rate, and then 740 ~ by the continuous annealing method. After the cracking for 20 to 120 seconds at 860 ℃, the method of producing a super-high strength cold rolled steel sheet excellent in spot weldability and press workability, characterized in that the over-aging treatment at 500 ~ 300 ℃ temperature section.

Description

점용접성 및 프레스 가공성이 우수한 초고강도 냉연강판의 제조방법Manufacturing method of ultra-high strength cold rolled steel sheet with excellent spot weldability and press workability

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

제1도 : 비교강과 발명강의 열간압연조건에 따른 미세조직사진,1: Microstructure photograph according to hot rolling conditions of comparative steel and inventive steel,

제2도 : 발명강과 비교강의 인장강도와 인장강도×연신율과의 관계를 나타내는 그래프.2 is a graph showing the relationship between tensile strength and tensile strength x elongation of inventive and comparative steels.

Claims (1)

초고강도 냉연강판을 제조하는 방법에 있어서, 중량%로 C : 0.10~0.20%, Si : 0.6~1.6%, Mn : 1.0~2.0%, Mo : 0.10~0.30%, Nb : 0.02~0.1%, N : 0.007%이하, 전부 Fe 및 기타 불가피한 불순물로 조성되고, 탄소당량(Ceq) (Ceq=C=Si/30+Mn/20+2P+4S)이 0.35이하인 알루미늄킬드(Al-Killed)강을 1200~1250℃에서 균열처리한후, 통상의 방법으로 열간압연한뒤 400~600℃에서 권취한 다음, 30~80%의 냉강압하율로 냉강압연한후, 연속소둔 방법에 의해 740~860℃에서 20~120초동안 균열한후, 500~300℃온도구간에서 과시효처리하는 것을 특징으로 하는 점용접성 및 프레스가공성이 우수한 초공강도 냉연강판의 제조방법In the method of manufacturing an ultra-high strength cold rolled steel sheet, C: 0.10 to 0.20%, Si: 0.6 to 1.6%, Mn: 1.0 to 2.0%, Mo: 0.10 to 0.30%, Nb: 0.02 to 0.1%, N : 1200% of Al-Killed steel with less than 0.007%, all composed of Fe and other unavoidable impurities, and having a carbon equivalent (Ceq) (Ceq = C = Si / 30 + Mn / 20 + 2P + 4S) of 0.35 or less After the cracking treatment at ~ 1250 ℃, hot rolling in a conventional manner, then wound at 400 ~ 600 ℃, cold rolled at a cold reduction rate of 30 ~ 80%, and then at 740 ~ 860 ℃ by a continuous annealing method After the cracking for 20 to 120 seconds, super aging strength and cold workability of the super-rolled cold rolled steel sheet, characterized in that the over-aging treatment at a temperature range of 500 ~ 300 ℃ ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930018897A 1993-09-17 1993-09-17 Making method of cold rolling steel sheet KR950007784B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930018897A KR950007784B1 (en) 1993-09-17 1993-09-17 Making method of cold rolling steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930018897A KR950007784B1 (en) 1993-09-17 1993-09-17 Making method of cold rolling steel sheet

Publications (2)

Publication Number Publication Date
KR950008708A true KR950008708A (en) 1995-04-19
KR950007784B1 KR950007784B1 (en) 1995-07-18

Family

ID=19363903

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930018897A KR950007784B1 (en) 1993-09-17 1993-09-17 Making method of cold rolling steel sheet

Country Status (1)

Country Link
KR (1) KR950007784B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100276277B1 (en) * 1996-04-25 2000-12-15 이구택 The manufacturing method for low carbon steel sheet with excellent workability and anti-aging effect
KR100273846B1 (en) * 1996-12-24 2000-12-15 이구택 The manufacturing method for low carbon cold rolling steel sheet with excellent normal temperature anti aging and formability
KR100467715B1 (en) * 2000-11-30 2005-01-24 주식회사 포스코 method of manufacturing steel strip for the press hardening process without oxidation
KR100550324B1 (en) * 2003-12-29 2006-02-07 주식회사 포스코 Method for preventing oxidation of press hardening process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100276277B1 (en) * 1996-04-25 2000-12-15 이구택 The manufacturing method for low carbon steel sheet with excellent workability and anti-aging effect
KR100273846B1 (en) * 1996-12-24 2000-12-15 이구택 The manufacturing method for low carbon cold rolling steel sheet with excellent normal temperature anti aging and formability
KR100467715B1 (en) * 2000-11-30 2005-01-24 주식회사 포스코 method of manufacturing steel strip for the press hardening process without oxidation
KR100550324B1 (en) * 2003-12-29 2006-02-07 주식회사 포스코 Method for preventing oxidation of press hardening process

Also Published As

Publication number Publication date
KR950007784B1 (en) 1995-07-18

Similar Documents

Publication Publication Date Title
US7018488B2 (en) Steel pipe for use in reinforcement of automobile and method for production thereof
KR950006690B1 (en) Low yield ration high strength hot rolled steel sheet & method of manufacturing the same
KR950026569A (en) High manganese steel with good hot workability and its hot rolling method
KR19990007429A (en) Osteoferrite stainless steel with very low nickel content and high tensile elongation
JP3233743B2 (en) High strength hot rolled steel sheet with excellent stretch flangeability
KR940002370A (en) Austenitic high manganese steel with excellent formability, strength and weldability, and its manufacturing method
KR930004492A (en) High tensile steel for deep drawing and its manufacturing method with excellent surface treatment
KR960014370A (en) Cold rolled steel sheet for shadow mask and manufacturing method
KR950008708A (en) Manufacturing method of ultra-high strength cold rolled steel sheet with excellent spot weldability and press workability
KR960021198A (en) Manufacturing method of cold rolled steel sheet with excellent formability and hardening hardening
KR100353256B1 (en) Making Process for Cold Rolled Steel Plate
JP2751760B2 (en) Ultra-high-strength thin steel sheet excellent in hydrogen delayed cracking resistance and method for producing the same
JP3247194B2 (en) High strength hot rolled steel sheet with excellent stretch flangeability and fatigue properties
JPH04224655A (en) High strength resistance welded tube for impact bar for vehicle door
US20240167137A1 (en) High strength cold rolled steel sheet for automotive use having excellent global formability and bending property
JP2562964B2 (en) Manufacturing method of hot rolled high strength steel sheet for heavy working
KR100368731B1 (en) Manufacturing method of high strength cold rolled steel sheet with excellent stretchability
KR950018579A (en) Ultra-high strength cold rolled steel manufacturing method with excellent ductility
KR970001579A (en) Coil binding steel with excellent ductility and its manufacturing method
JPH04333526A (en) Hot rolled high tensile strength steel plate having high ductility and its production
KR970006520A (en) Manufacturing method of cold rolled steel sheet for expansion vessel with excellent weldability and formability
KR950014345A (en) Manufacturing method of cold rolled steel sheet with excellent hardening and moldability
KR900007454B1 (en) Cold rolled steel plate having a super high strength and the method
JP2000192137A (en) Production of high strength cold rolled steel sheet extremely small in variation of strength
JPH07258732A (en) Production of high strength stainless hot rolled steel sheet excellent in workability

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20030701

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee