JP4834733B2 - 耐時効性に優れた高強度焼付硬化型冷間圧延鋼板、溶融メッキ鋼板及び冷間圧延鋼板の製造方法。 - Google Patents
耐時効性に優れた高強度焼付硬化型冷間圧延鋼板、溶融メッキ鋼板及び冷間圧延鋼板の製造方法。 Download PDFInfo
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- 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
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- 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
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- 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
- C21D8/0236—Cold rolling
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
鋼中固溶炭素量(C*)が下記の関係式(1)を満たし、
[関係式1]
C*[結晶粒界に存在する固溶炭素量(GB−Cと称する)+結晶粒内に存在する固溶炭素量(G−Cと称する)]=Total C(ppm)−C in NbC=8〜15ppm
[上記式(1)において、GB−C量(結晶粒界内の固溶炭素量)は5〜10ppmで、G−C量(結晶粒内の固溶炭素量)は3〜7ppmである]
焼鈍後、結晶粒のサイズがASTM Number(以下、No.と称する)で9以上で、
焼付硬化量(BH)値と時効指数(AI)値が夫々下記の関係式(2)及び(3)の条件を満たし、
[関係式2]
焼付硬化量(BH)=50−(885×Ti)−(1589×Nb)+(62×Al)
[関係式3]
時効指数(AI)=44−(423×Ti)−(2119×Nb)−(125×Mo)
焼付硬化量(BH)が30MPa以上で、時効指数(AI)値が30MPa以下で、DBTTが伸び比2.0で−30℃以下であることを特徴とする耐時効性に優れた高強度焼付硬化型冷間圧延鋼板及びこれを利用した溶融メッキ鋼板に関するものである。
C*[結晶粒界に存在する固溶炭素量(GB−Cと称する)+結晶粒内に存在する固溶炭素量(G−Cと称する)]=Total C(ppm)−C in NbC=8〜15ppm
焼付硬化量(BH)=50−(885×Ti)−(1589×Nb)+(62×Al)
[関係式3]
時効指数(AI)=44−(423×Ti)−(2119×Nb)−(125×Mo)
上記のように組成される鋼スラブ(Slab)を熱間圧延前のオーステナイト組織が充分に均質化されることができる1200℃以上で再加熱し、Ar3温度直上である900−950℃の温度範囲で熱間圧延を仕上げる。
下記の表1のように組成される鋼を900−910℃の仕上げ圧延温度条件で熱間仕上げ圧延を行った後、610−630℃の巻取温度で巻取を行い、75−78%の冷間圧延率で冷間圧延した後、800−820℃の焼鈍温度で連続焼鈍し450−470℃の温度で溶融メッキした後、500−530℃の温度範囲で合金化処理した溶融メッキ鋼板を1.5%の調質圧下率で調質圧延し、最終鋼板のBH値、AI値、結晶粒のサイズ及び2次加工脆性を評価する項目である伸び比2.0でDBTTを測定し、その結果を下記表2に示した。また、下記表1の発明鋼(6)に対して粒内固溶炭素量を測定し、その結果を図3に示した。
Claims (3)
- 重量%で、C:0.0016−0.0025%、Si:0.02%以下、Mn:0.2−1.2%、P:0.05−0.11%、S:0.01%以下、可溶(Soluble)Al:0.08−0.12%、N:0.0025%以下、Ti:0−0.003%、Nb:0.003−0.011%、Mo:0.01−0.1%及びB:0.0005−0.0015%を含み、残りのFe及びその他不可避な不純物からなり、
鋼中固溶炭素量(C*)が下記の関係式(1)を満たし、
[関係式1]
C*[結晶粒界に存在する固溶炭素量(GB−Cと称する)+結晶粒内に存在する固溶炭素量(G−Cと称する)]=Total C(ppm)− C in NbC=8〜15ppm
[前記式(1)で、GB−C量(結晶粒界内の固溶炭素量)は5〜10ppmで、G−C量(結晶粒内の固溶炭素量)は3〜7ppmである]
焼鈍後、結晶粒のサイズがASTM No.で9以上で、
焼付硬化量(BH)値と時効指数(AI)値が夫々下記の関係式(2)及び(3)の条件を満たし、
[関係式2]
焼付硬化量(BH)=50−(885×Ti)−(1589×Nb)+(62×Al)
[関係式3]
時効指数(AI)=44−(423×Ti)−(2119×Nb)−(125×Mo)
焼付硬化量(BH)が30MPa以上で、時効指数(AI)値が30MPa以下で、DBTTが伸び比2.0で−30℃以下であることを特徴とする耐時効性に優れた高強度焼付硬化型冷間圧延鋼板。 - 重量%で、C:0.0016−0.0025%、Si:0.02%以下、Mn:0.2−1.2%、P:0.05−0.11%、S:0.01%以下、可溶(Soluble)Al:0.08−0.12%、N:0.0025%以下、Ti:0−0.003%、Nb:0.003−0.011%、Mo:0.01−0.1%及びB:0.0005−0.0015%を含み、残りのFe及びその他不可避な不純物からなり、
鋼中固溶炭素量(C*)が下記の関係式(1)を満たし、
[関係式1]
C*[結晶粒界に存在する固溶炭素量(GB−Cと称する)+結晶粒内に存在する固溶炭素量(G−Cと称する)]=Total C(ppm)−C in NbC=8〜15ppm
[前記式(1)で、GB−C量(結晶粒界内の固溶炭素量)は5〜10ppmで、G−C量(結晶粒内の固溶炭素量)は3〜7ppmである]
焼鈍後、結晶粒のサイズがASTM No.で9以上で、
焼付硬化量(BH)値と時効指数(AI)値が夫々下記の関係式(2)及び(3)の条件を満たし、
[関係式2]
焼付硬化量(BH)=50−(885×Ti)−(1589×Nb)+(62×Al)
[関係式3]
時効指数(AI)=44−(423×Ti)−(2119×Nb)−(125×Mo)
焼付硬化量(BH)が30MPa以上で、時効指数(AI)値が30MPa以下で、DBTTが伸び比2.0で−30℃以下であることを特徴とする耐時効性に優れた高強度焼付硬化型溶融メッキ鋼板。 - 重量%で、C:0.0016−0.0025%、Si:0.02%以下、Mn:0.2−1.2%、P:0.05−0.11%、S:0.01%以下、可溶(Soluble)Al:0.08−0.12%、N:0.0025%以下、Ti:0−0.003%、Nb:0.003−0.011%、Mo:0.01−0.1%及びB:0.0005−0.0015%を含み、残りのFe及びその他不可避な不純物からなるアルミニウム−キルド(Al−Killed)鋼を1200℃以上で均質化熱処理した後、900−950℃の温度範囲で仕上げの熱間圧延した後、580−630℃の温度範囲で巻取し、75−80%の圧下率で冷間圧延した後、770−830℃の温度範囲で連続焼鈍し、そして1.2−1.5%の圧下率で調質圧延することを特徴とする耐時効性に優れた高強度焼付硬化型冷間圧延鋼板の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050088518A KR100685037B1 (ko) | 2005-09-23 | 2005-09-23 | 내시효성이 우수한 고장력 소부경화형 냉간압연강판,용융도금강판 및 냉연강판의 제조방법 |
KR10-2005-0088518 | 2005-09-23 | ||
PCT/KR2006/003777 WO2007035059A1 (en) | 2005-09-23 | 2006-09-22 | Bake-hardenable cold rolled steel sheet with superior strength and aging resistance, gal- vannealed steel sheet using the cold rolled steel sheet and method for manufacturing the cold rolled steel sheet |
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JP2009509046A JP2009509046A (ja) | 2009-03-05 |
JP4834733B2 true JP4834733B2 (ja) | 2011-12-14 |
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JP2008532164A Active JP4834733B2 (ja) | 2005-09-23 | 2006-09-22 | 耐時効性に優れた高強度焼付硬化型冷間圧延鋼板、溶融メッキ鋼板及び冷間圧延鋼板の製造方法。 |
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US (1) | US20080251168A1 (ja) |
EP (1) | EP1937853B1 (ja) |
JP (1) | JP4834733B2 (ja) |
KR (1) | KR100685037B1 (ja) |
CN (1) | CN101310031B (ja) |
WO (1) | WO2007035059A1 (ja) |
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US9162422B2 (en) * | 2011-09-30 | 2015-10-20 | Nippon Steel & Sumitomo Metal Corporation | High-strength hot-dip galvanized steel sheet, high-strength alloyed hot-dip galvanized steel sheet excellent in bake hardenability, and manufacturing method thereof |
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2005
- 2005-09-23 KR KR1020050088518A patent/KR100685037B1/ko active IP Right Grant
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- 2006-09-22 WO PCT/KR2006/003777 patent/WO2007035059A1/en active Application Filing
- 2006-09-22 JP JP2008532164A patent/JP4834733B2/ja active Active
- 2006-09-22 US US12/067,617 patent/US20080251168A1/en not_active Abandoned
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JP2002012920A (ja) * | 2000-04-28 | 2002-01-15 | Sumitomo Metal Ind Ltd | 耐常温時効性、加工性、塗装焼付硬化性に優れた薄鋼板の製造方法 |
JP2005520054A (ja) * | 2002-06-28 | 2005-07-07 | ポスコ | 成形性及び溶接性に優れた高強度冷延鋼板とその製造方法 |
JP2004043884A (ja) * | 2002-07-11 | 2004-02-12 | Jfe Steel Kk | 低温焼付硬化性および耐時効性に優れる加工用薄鋼板 |
JP2007530783A (ja) * | 2004-03-25 | 2007-11-01 | ポスコ | 高強度焼付硬化型冷間圧延鋼板、溶融めっき鋼板及びその製造方法 |
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JP2009509046A (ja) | 2009-03-05 |
EP1937853B1 (en) | 2013-12-25 |
EP1937853A4 (en) | 2011-10-19 |
CN101310031A (zh) | 2008-11-19 |
CN101310031B (zh) | 2010-12-29 |
US20080251168A1 (en) | 2008-10-16 |
WO2007035059A1 (en) | 2007-03-29 |
KR100685037B1 (ko) | 2007-02-20 |
EP1937853A1 (en) | 2008-07-02 |
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