JP6823148B2 - 強度、延性および成形性が改善された高強度被覆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被覆鋼板を製造する方法 Download PDFInfo
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- JP6823148B2 JP6823148B2 JP2019211100A JP2019211100A JP6823148B2 JP 6823148 B2 JP6823148 B2 JP 6823148B2 JP 2019211100 A JP2019211100 A JP 2019211100A JP 2019211100 A JP2019211100 A JP 2019211100A JP 6823148 B2 JP6823148 B2 JP 6823148B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 95
- 239000010959 steel Substances 0.000 title claims description 95
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 31
- 238000009826 distribution Methods 0.000 claims description 25
- 238000010791 quenching Methods 0.000 claims description 25
- 230000000171 quenching effect Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 229910000734 martensite Inorganic materials 0.000 claims description 21
- 230000000717 retained effect Effects 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 238000005246 galvanizing Methods 0.000 claims description 16
- 229910001563 bainite Inorganic materials 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000005275 alloying Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 description 5
- 239000008397 galvanized steel Substances 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000000638 solvent extraction Methods 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 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
- 238000010586 diagram Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 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
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Description
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
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。
− 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、
− 250℃から350℃の間の焼入れ温度QTまで、焼入れ直後にマルテンサイトおよびオーステナイトからなる組織を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、マルテンサイト含量は少なくとも60%であり、オーステナイト含量は、最終的な組織が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を含有しフェライトを含まないような含量である、工程、
− 鋼板を430℃から480℃の間の分配温度PTまで加熱し、鋼板をこの温度において10秒から90秒の間の分配時間Ptの間維持する工程、
− 鋼板を溶融めっきする工程、および
− 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%
Al≦0.5%
を含有し、残部はFeおよび不可避不純物である。鋼の組織は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。鋼板の少なくとも一方の面は金属被覆を含む。鋼板は降伏強度が少なくとも800MPa、引張強度が少なくとも1180MPa、全伸びが少なくとも14%、穴広げ率HERが少なくとも30%である。
− 十分な強度を確保し、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。
好ましくは、Al含量は0.05%に制限される。Alの含量が0.5%を超える場合、オーステナイト化温度は高すぎるために到達しないことになり、鋼は工業的に加工が困難となる。
− 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。鋼板は化学組成および組織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。
− 任意選択的に、鋼板が溶融めっきされるために加熱される必要がある温度と等しくするために、冷却または加熱によって鋼板の温度を調整する工程。
Claims (18)
- 重量%で
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含有する化学組成を有し、残部がFeおよび不可避不純物である、鋼板を熱処理および被覆することによって、延性が改善され成形性が改善された高強度被覆鋼板を製造する方法であって、被覆鋼板の降伏強度YSが少なくとも800MPa、引張強度TSが少なくとも1180MPa、全伸びが少なくとも14%、穴広げ率HERが少なくとも30%であり、
熱処理および被覆が以下の工程:
− 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、
− 250℃から350℃の間の焼入れ温度QTまで、焼入れ直後にマルテンサイトおよびオーステナイトからなる組織を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、マルテンサイト含量は少なくとも60%である、工程、
− 鋼板を430℃から480℃の間の分配温度PTまで加熱し、鋼板を分配温度において10秒から90秒の間の分配時間Ptの間維持する工程、
− 鋼板を溶融めっきする工程、および
− 鋼板を室温まで冷却する工程
を含み、
最終的な組織が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を含有しフェライトを含まず、
マルテンサイトは少なくとも65%であり、
ベイナイトおよびマルテンサイトのブロックの平均径は10μm以下である、
方法。 - 鋼板の化学組成が以下の条件:
0.17%≦C≦0.21%
を満たす、請求項1に記載の方法。 - 鋼板の化学組成が以下の条件:
1.3%≦Si≦1.6%
を満たす、請求項1または2のいずれか一項に記載の方法。 - 鋼板の化学組成が以下の条件:
2.1%≦Mn≦2.3%
を満たす、請求項1から3のいずれか一項に記載の方法。 - 溶融めっき工程が亜鉛めっき工程である、請求項1から4のいずれか一項に記載の方法。
- 溶融めっき工程が、合金化温度TGAを480℃から510℃の間とする合金化溶融亜鉛めっき工程である、請求項1から4のいずれか一項に記載の方法。
- 焼入れの間の冷却スピードが、少なくとも20℃/秒である、請求項1から6のいずれか一項に記載の方法。
- 焼入れの間の冷却スピードが、少なくとも30℃/秒である、請求項7に記載の方法。
- 鋼板が焼入れ温度まで焼入れされた後、および鋼板を分配温度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7のいずれか一項に記載の方法。
- 焼入れ温度QTにおける保持時間が3秒から7秒の間に含まれる時間である、請求項9に記載の方法。
- 重量%で
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2.1%≦Mn≦2.3%
0.1≦Cr≦0.25%
Al≦0.5%
を含有する化学組成を有し、残部がFeおよび不可避不純物である、被覆鋼板であって、被覆鋼板は、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る組織を有し、マルテンサイトは少なくとも65%であり、該組織はフェライトを含まず、ベイナイトおよびマルテンサイトのブロックの平均径は10μm以下であり、
被覆鋼板の少なくとも一方の面が金属被覆を含み、被覆鋼板の降伏強度が少なくとも800MPa、引張強度が少なくとも1180MPa、全伸びが少なくとも14%、穴広げ率HERが少なくとも30%である、被覆鋼板。 - 化学組成が以下の条件:
0.17%≦C≦0.21%
を満たす、請求項11に記載の被覆鋼板。 - 化学組成が
1.3%≦Si≦1.6%
を満たす、請求項11または12に記載の被覆鋼板。 - 金属被覆を含む少なくとも1つの面が亜鉛めっきされている、請求項11から13のいずれか一項に記載の被覆鋼板。
- 金属被覆を含む少なくとも1つの面が合金化溶融亜鉛めっきされている、請求項14に記載の被覆鋼板。
- 残留オーステナイトが少なくとも0.9%のC含量を有する、請求項11から15のいずれか一項に記載の被覆鋼板。
- 残留オーステナイトが少なくとも1.0%のC含量を有する、請求項16に記載の被覆鋼板。
- 残留オーステナイトが5μm以下の平均結晶粒径を有する、請求項11から17のいずれか一項に記載の被覆鋼板。
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UA118792C2 (uk) | 2019-03-11 |
EP3831965A1 (en) | 2021-06-09 |
JP2017527690A (ja) | 2017-09-21 |
BR112017000005A2 (pt) | 2017-11-07 |
CN106471139A (zh) | 2017-03-01 |
WO2016001702A1 (en) | 2016-01-07 |
KR20170028328A (ko) | 2017-03-13 |
CA2954146A1 (en) | 2016-01-07 |
JP6623183B2 (ja) | 2019-12-18 |
RU2016151385A (ru) | 2018-06-26 |
RU2016151385A3 (ja) | 2018-12-06 |
MA53357A (fr) | 2021-06-09 |
US20200347477A1 (en) | 2020-11-05 |
MX2016017399A (es) | 2017-05-01 |
US20170152579A1 (en) | 2017-06-01 |
CN106471139B (zh) | 2018-08-31 |
HUE054278T2 (hu) | 2021-08-30 |
ES2855500T3 (es) | 2021-09-23 |
BR112017000005B1 (pt) | 2021-04-13 |
JP2020045573A (ja) | 2020-03-26 |
MA40196B1 (fr) | 2021-03-31 |
PL3164522T3 (pl) | 2021-09-06 |
EP3164522B1 (en) | 2021-03-03 |
RU2686729C2 (ru) | 2019-04-30 |
WO2016001895A3 (en) | 2016-03-17 |
WO2016001895A2 (en) | 2016-01-07 |
US11492676B2 (en) | 2022-11-08 |
CA2954146C (en) | 2022-07-12 |
EP3164522A2 (en) | 2017-05-10 |
MA40196A (fr) | 2017-05-10 |
KR102455942B1 (ko) | 2022-10-17 |
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