KR20040059578A - 변형유기 동적변태를 이용한 고강도 초세립강 제조방법 - Google Patents
변형유기 동적변태를 이용한 고강도 초세립강 제조방법 Download PDFInfo
- Publication number
- KR20040059578A KR20040059578A KR1020020085252A KR20020085252A KR20040059578A KR 20040059578 A KR20040059578 A KR 20040059578A KR 1020020085252 A KR1020020085252 A KR 1020020085252A KR 20020085252 A KR20020085252 A KR 20020085252A KR 20040059578 A KR20040059578 A KR 20040059578A
- Authority
- KR
- South Korea
- Prior art keywords
- less
- steel
- ferrite
- cooling
- austenite
- Prior art date
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Classifications
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
구분 | 시험번호 | AGS(㎛) | Ar3온도(℃) | 압연개시온도(℃) | 압연종료온도(℃) | 패스당압하율(%) | 총압하율(%) |
비교예 | 1 | 80 | 710 | 1150 | 950 | 15 | 80 |
2 | 80 | 710 | 1150 | 950 | 20 | 80 | |
3 | 50 | 735 | 1150 | 900 | 15 | 80 | |
4 | 50 | 735 | 1000 | 800 | 20 | 90 | |
5 | 50 | 735 | 730 | 710 | 15 | 33.5 | |
6 | 50 | 735 | 725 | 725 | 50 | 50 | |
7 | 100 | 710 | 800 | 750 | 20 | 90 | |
8 | 50 | 735 | 800 | 750 | 50 | 79 | |
9 | 50 | 735 | 800 | 750 | 20 | 40 | |
10 | 50 | 735 | 800 | 750 | 20 | 40 | |
발명예 | 1 | 50 | 735 | 800 | 750 | 20 | 79 |
2 | 50 | 735 | 780 | 740 | 30 | 75 | |
3 | 20 | 755 | 750 | 750 | 20 | 67 | |
4 | 20 | 755 | 750 | 750 | 30 | 75 |
구분 | 시험 번호 | 냉각속도(℃/s) | 냉각종료온도(℃) | 동적변태페라이트분율(%) | 최종페라이트분율(%) | 마르텐사이트분율(%) | 평균FGS(㎛) | 항복강도(kgf/㎛2) | 인장강도(kgf/㎛2) | 연신율% |
비교재 | 1 | 공냉 | 상온 | 0 | 74 | 0 * | 15.6 | 31.5 | 49.2 | 42 |
2 | 공냉 | 상온 | 0 | 70 | 0 | 15.1 | 31.8 | 51.1 | 43 | |
3 | 공냉 | 상온 | 0 | 71 | 0 | 13.4 | 32.6 | 52.9 | 41 | |
4 | 공냉 | 상온 | 18 | 73 | 0 | 11.0 | 34.1 | 51.4 | 38 | |
5 | 공냉 | 상온 | 42 | 78 | 0 | 10.0 | 39.1 | 53.3 | 38 | |
6 | 공냉 | 상온 | 42 | 77 | 0 | 8.1 | 42.2 | 56.3 | 32 | |
7 | 공냉 | 상온 | 18 | 65 | 0 | 11.5 | 34.9 | 52.7 | 36 | |
8 | 공냉 | 상온 | 43 | 75 | 0 | 6.3 | 42.5 | 55.7 | 34 | |
9 | 공냉 | 상온 | 32 | 71 | 0 | 9.3 | 41.3 | 54.9 | 35 | |
10 | 15 | 300 | 32 | 52 | 48 | 8.0 | 32.3 | 72.9 | 18 | |
발명재 | 1 | 8 | 250 | 40 | 73 | 27 | 4.5 | 41.2 | 65.6 | 32 |
2 | 15 | 300 | 42 | 72 | 28 | 3.7 | 41.8 | 67.0 | 31 | |
3 | 8 | 250 | 44 | 70 | 30 | 4.1 | 42.0 | 66.5 | 35 | |
4 | 15 | 300 | 49 | 75 | 25 | 3.5 | 42.5 | 68.2 | 28 |
Claims (2)
- 중량%로, C: 0.3%이하, Si: 2.0%이하, Mn: 3.0%이하, Nb: 0.01~0.08%, 잔부 철 및 불가피한 불순물을 포함하여 조성되는 강재를 마련하는 단계;상기 강재를 마무리압연하기 전에 오스테나이트 조직의 평균결정입 크기를 50㎛이하가 되도록 제어하는 단계;상기 조직의 강재를 Ar3~ Ar3+100℃의 온도범위에서 한 패스당 압하율을 30% 이하로 유지하면서 그 총압하율이 60%이상이 되도록 열간다단가공시키는 단계; 및상기 열간압연된 강재를 냉각종료온도 300℃이하까지 5℃/sec이상의 냉각속도로 냉각시켜 잔류 오스테나이트를 마르텐사이트로 변태시키는 단계;를 포함하는 변형유기 동적변태를 이용한 고강도 초세립강 제조방법
- 제 1항에 있어서, 상기 변태 마르텐사이트 분율이 40%이하인 것을 특징으로 하는 변형유기 동적변태를 이용한 고강도 초세립강 제조방법
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020020085252A KR100946048B1 (ko) | 2002-12-27 | 2002-12-27 | 변형유기 동적변태를 이용한 고강도 초세립강 제조방법 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020020085252A KR100946048B1 (ko) | 2002-12-27 | 2002-12-27 | 변형유기 동적변태를 이용한 고강도 초세립강 제조방법 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20040059578A true KR20040059578A (ko) | 2004-07-06 |
KR100946048B1 KR100946048B1 (ko) | 2010-03-09 |
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KR1020020085252A KR100946048B1 (ko) | 2002-12-27 | 2002-12-27 | 변형유기 동적변태를 이용한 고강도 초세립강 제조방법 |
Country Status (1)
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KR (1) | KR100946048B1 (ko) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100431851B1 (ko) * | 1999-12-28 | 2004-05-20 | 주식회사 포스코 | 고강도 구조용 강 및 그 제조방법 |
JP2002129286A (ja) | 2000-10-30 | 2002-05-09 | Nippon Steel Corp | バーリング加工性に優れる加工誘起変態型複合組織鋼板およびその製造方法 |
KR100489024B1 (ko) * | 2000-11-27 | 2005-05-11 | 주식회사 포스코 | 재결정제어압연에 의한 용접구조용 강재의 제조방법 |
KR100481370B1 (ko) * | 2000-12-23 | 2005-04-08 | 주식회사 포스코 | 저온인성이 우수한 라인파이프용 열연강재의 제조방법 |
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- 2002-12-27 KR KR1020020085252A patent/KR100946048B1/ko active IP Right Grant
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KR100946048B1 (ko) | 2010-03-09 |
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