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 PDFInfo
- 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
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- KR
- South Korea
- Prior art keywords
- cold rolled
- steel sheet
- high strength
- rolled steel
- ultra
- Prior art date
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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
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- 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
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)
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 |
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KR (1) | KR950007784B1 (en) |
Cited By (4)
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 |
-
1993
- 1993-09-17 KR KR1019930018897A patent/KR950007784B1/en not_active IP Right Cessation
Cited By (4)
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 |
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