JP2017514989A - 高降伏強度を備えた冷間圧延平鋼製品の製造方法及び冷延平鋼製品 - Google Patents
高降伏強度を備えた冷間圧延平鋼製品の製造方法及び冷延平鋼製品 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 126
- 239000010959 steel Substances 0.000 title claims abstract description 126
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 41
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 16
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000005097 cold rolling Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 238000005246 galvanizing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000007774 longterm Effects 0.000 description 8
- 230000032683 aging Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
Description
a)請求項1に示された成分を備えた鋼をスラブに鋳造するステップと;
b)前記スラブを1,200〜1,300°Cの再加熱温度に再加熱するステップと、;
c)前記再加熱したスラブを熱間圧延鋼帯に熱間圧延するステップであって、前記熱間圧延完了時の熱間圧延鋼帯の熱間圧延温度は800〜970°Cであるステップと;
d)前記熱間圧延鋼帯を450〜650°Cの巻き取り温度で巻き取るステップと;
e)前記熱間圧延鋼帯を1又は複数の冷間圧延工程で冷間圧延平鋼製品へ冷間圧延するステップであって、前記冷間圧延により達成される冷間圧延度は合計で25〜80%であるステップと;
f)700〜900°Cの連続焼鈍温度で前記冷間圧延平鋼製品を連続焼鈍するステップと;
g)前記平鋼製品を周囲温度まで冷却するステップと
を実行することができる。
Claims (10)
- 少なくとも0.7の降伏比Re/Rmを備えた冷間圧延鋼帯の製造方法であって、
冷間圧延平鋼製品が、鉄、不可避的製造不純物、及び、重量%で、C:0.05〜0.20%、Si:0.25〜1.00%、Mn:1.0〜3.0%、Al:0.02〜1.5%、Cr:0.1〜1.5%、N:0.02%未満、P:0.03%未満、及びS:0.05%未満を含むとともに、任意に、Ti、Mo、Nb、V、Bからなる群から選択される一つ又は複数の元素[ただし、Ti:0.15%以下、Mo:2%未満、Nb:0.1%未満、V:0.12%未満、B:0.0005〜0.003%とする。]を含む鋼として提供され、
前記提供される冷間圧延平鋼製品は、4.5〜24時間の焼鈍時間にわたって150°C以下〜400°C以下の焼鈍温度で焼鈍される、追加の熱処理を受けることを特徴とする冷間圧延鋼帯の製造方法。 - 前記焼鈍時間が6〜18時間であることを特徴とする請求項1に記載の方法。
- 前記追加の熱処理後に得られる前記冷間圧延平鋼製品は、少なくとも2相を含む組織を有し、該組織は、少なくとも10体積%の焼戻しマルテンサイト、10体積%未満のベイナイト、10体積%未満の残留オーステナイト及び残部としての鉄を含有することを特徴とする請求項1又は2に記載の方法。
- 前記平鋼製品の組織は少なくとも10体積%のフェライトを含有することを特徴とする請求項3に記載の方法。
- 前記平鋼製品の組織は少なくとも10体積%の焼戻しマルテンサイトを含有することを特徴とする請求項3又は4に記載の方法。
- 前記提供される平鋼製品の製造において、以下の加工ステップ:
a)請求項1に記載の前記組成を備えた鋼をスラブに鋳造するステップと;
b)前記スラブを1,200〜1,300°Cの再加熱温度に再加熱するステップと;
c)前記再加熱したスラブを熱間圧延鋼帯に熱間圧延するステップであって、前記熱間圧延完了時の熱間圧延鋼帯の熱間圧延温度は800〜970°Cであるステップと;
d)前記熱間圧延鋼帯を450〜650°Cの巻き取り温度で巻き取るステップと;
e)前記熱間圧延鋼帯を1又は複数の冷間圧延工程で冷間圧延平鋼製品に冷間圧延するステップであって、前記冷間圧延によって達成される冷間圧延度は合計で25〜80%であるステップと;
f)700〜900°Cの連続焼鈍温度で前記冷間圧延平鋼製品を連続焼鈍するステップと;
g)前記平鋼製品を周囲温度まで冷却するステップと
が実行されることを特徴とする請求項1〜5のいずれか一項に記載の方法。 - 前記追加の熱処理に供される前記冷間圧延平鋼製品は金属保護皮膜を備えることを特徴とする請求項1〜6のいずれか一項に記載の方法。
- 前記金属保護皮膜は前記冷間圧延平鋼製品の溶融亜鉛めっきによって塗布されることを特徴とする請求項7に記載の方法。
- 前記冷間圧延平鋼製品は前記追加の熱処理の前に合金化溶融亜鉛めっき処理を受けることを特徴とする請求項8に記載の方法。
- 重量%で、C:0.05〜0.20%、Si:0.25〜1.00%、Mn:1.0〜3.0%、Al:0.02〜1.5%、Cr:0.1〜1.5%、N:0.02%未満、P:0.03%未満、及びS:0.05%未満を含むとともに、任意に、Ti、Mo、Nb、V、Bからなる群から選択される一つ又は複数の元素[ただし、Ti:0.15%以下、Mo:2%未満、Nb:0.1%未満、V:、B:0.0005〜0.003%とする。]を含み、残部が鉄及び不可避的不純物である組成を備えた鋼を含み、
少なくとも2相を含む組織であって、少なくとも10体積%の焼戻しマルテンサイト、10体積%未満のベイナイト、10体積%未満の残留オーステナイト及び残部としてのフェライトを含有する組織を有し、
少なくとも0.7の降伏比Re/Rm、750MPaを超える引張強さRm及び少なくとも18%の穴広げ率LAを有する
ことを特徴とする冷間圧延平鋼製品。
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