JP2017524820A - 強度、延性および成形性が改善された高強度鋼板を製造する方法 - Google Patents
強度、延性および成形性が改善された高強度鋼板を製造する方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 29
- 238000010791 quenching Methods 0.000 claims abstract description 26
- 230000000171 quenching effect Effects 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 230000000717 retained effect Effects 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000003303 reheating Methods 0.000 description 6
- 239000011572 manganese Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Abstract
Description
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Nb≦0.05%
Ti≦0.05%
Al≦0.50%
を含有し、残部はFeおよび不可避不純物である、方法に関する。熱処理は以下の工程:
− Ac3を超えるが1000℃未満である焼鈍温度TAにおいて30秒を超える時間で鋼板を焼鈍する工程、
− 275℃から325℃の間の焼入れ温度QTまで、オーステナイトおよび少なくとも50%のマルテンサイトからなる組織を焼入れ直後に得るのに十分な冷却スピードで鋼板を冷却することにより、鋼板を焼入れする工程であって、オーステナイト含量は、最終的な組織、すなわち処理および室温までの冷却後の組織が3%から15%の間の残留オーステナイトならびに85%から97%の間のマルテンサイトおよびベイナイトの合計を含有し、フェライトを含まないことができる含量である、工程
− 鋼板を420℃から470℃の間の分配温度PTまで加熱し、および鋼板をこの温度において50秒から150秒の間の分配時間Ptの間維持する工程、
− 鋼板を室温まで冷却する工程
を含む。
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1≦Cr≦0.25%
Nb≦0.05%
Ti≦0.05%
Al≦0.5%
を含有し、残部がFeおよび不可避不純物である鋼板にも関し、鋼板は降伏強度が少なくとも850MPa、引張強度が少なくとも1180MPa、全伸びが少なくとも14%、および穴広げ率HERが少なくとも30%であり、組織は3%から15%の残留オーステナイトならびに85%から97%のマルテンサイトおよびベイナイトからなりフェライトを含まない。
− 十分な強度を確保し、且つ十分な伸びを得るのに必要である残留オーステナイトの安定性を改善するための、0.15%から0.25%、好ましくは0.17%を超え好ましくは0.21%未満の炭素。炭素含量が高すぎる場合、熱間圧延した鋼板は硬すぎて冷間圧延できず、溶接性が不十分である。
− 組織が完全にオーステナイトであることを確実にするように、鋼のAc3変態点を超える、好ましくはAc3+15℃を超える、すなわち本発明による鋼については約850℃を超えるが、オーステナイト結晶粒を過度に粗大化させないために1000℃未満である焼鈍温度TAにおいて、鋼板を焼鈍する工程。鋼板は化学組成を均質化させるのに十分な時間をかけて、焼鈍温度で維持される、すなわちTA−5℃からTA+10℃の間で維持される。この時間は好ましくは30秒を超えるが300秒を超える必要はない。
Claims (10)
- 鋼板を熱処理することによって、延性が改善され且つ成形性が改善された高強度鋼板を製造する方法であって、鋼板の降伏強度YSが少なくとも850MPa、引張強度TSが少なくとも1180MPa、全伸びが少なくとも14%、および穴広げ率HERが少なくとも30%であり、鋼の化学組成が:
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Nb≦0.05%
Ti≦0.05%
Al≦0.50%
を含有し、残部はFeおよび不可避不純物であり、熱処理は以下の工程:
− Ac3を超えるが1000℃未満である焼鈍温度TAにおいて30秒を超える時間で鋼板を焼鈍する工程、
− 275℃から325℃の間の焼入れ温度QTまで、オーステナイトおよび少なくとも50%のマルテンサイトからなる組織を焼入れ直後に得るのに十分な冷却スピードで鋼板を冷却することにより、鋼板を焼入れする工程であって、オーステナイト含量は、最終的な組織、すなわち処理および室温までの冷却後の組織が3%から15%の間の残留オーステナイトならびに85%から97%の間のマルテンサイトおよびベイナイトの合計を含有し、フェライトを含まないことができるような含量である、工程
− 鋼板を420℃から470℃の間の分配温度PTまで加熱し、鋼板をこの温度において50秒から150秒の間の分配時間Ptの間維持する工程、
− 鋼板を室温まで冷却する工程
を含む、方法。 - 鋼の化学組成が、Al≦0.05%であるような組成である、請求項1に記載の方法。
- 焼入れする工程中の冷却スピードが、少なくとも20℃/秒、好ましくは少なくとも30℃/秒である、請求項1または2に記載の方法。
- 鋼板が焼入れ温度QTまで焼入れされた後、且つ鋼板を分配温度PTまで加熱する前に、鋼板を焼入れ温度QTにおいて2秒から8秒の間、好ましくは3秒から7秒の間に含まれる保持時間の間維持する工程をさらに含む、請求項1から3のいずれか一項に記載の方法。
- 焼鈍温度TAが850℃を超える、請求項1から4のいずれか一項に記載の方法。
- 鋼の化学組成が重量%で
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
1.1%≦Cr≦0.25%
Nb≦0.05%
Ti≦0.05%
Al≦0.5%
を含有し、残部はFeおよび不可避不純物である鋼板であって、降伏強度が少なくとも850MPa、引張強度が少なくとも1180MPa、全伸びが少なくとも14%、および穴広げ率HERが少なくとも30%であり、且つ組織が3%から15%の残留オーステナイトならびに85%から97%のマルテンサイトおよびベイナイトからなりフェライトを含まない、鋼板。 - 降伏強度が950MPaを超える、請求項6に記載の鋼板。
- 鋼の化学組成がAl≦0.05%であるような組成である、請求項6または7に記載の鋼板。
- 残留オーステナイト中の炭素の量が少なくとも0.9%、好ましくは少なくとも1.0%である、請求項6から8のいずれか一項に記載の鋼板。
- 平均のオーステナイト結晶粒径が最大で5μmである、請求項6から9のいずれか一項に記載の鋼板。
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