JP6792946B2 - 低降伏比を有する超高強靭鋼板及びその製造方法 - Google Patents
低降伏比を有する超高強靭鋼板及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 150
- 239000010959 steel Substances 0.000 title claims description 150
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 229910001566 austenite Inorganic materials 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 17
- 229910000734 martensite Inorganic materials 0.000 claims description 16
- 238000005496 tempering Methods 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910052729 chemical element Inorganic materials 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims 2
- 239000013078 crystal Substances 0.000 description 9
- 230000009466 transformation Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000033001 locomotion Effects 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 229910052758 niobium Inorganic materials 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 231100000681 Certain safety factor Toxicity 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Description
公開番号がWO2007/051080であり、公開日が2007年5月3日であり、発明の名称が「低降伏比、高靭性及び優れた溶接性を有する高強度二相鋼」である特許文献は、軟質相と硬質相の複合ミクロ構造を有する二相高強度鋼を公開し、その複合ミクロ構造は、低降伏比、高歪み成形能、優れた溶接性及び高靭性を提供でき、その化学成分は、C:0.03〜0.12%、Ni:0.1〜1.0%、Nb:0.005〜0.05%、Ti:0.005〜0.03%、Mo:0.1〜0.6%、Mn:0.5〜2.5%、Cu:≦1.0%、Cr:≦1.0%、Ca:≦0.01%を含み、更に任意の元素V:≦0.1%、B:≦0.002%、Mg:≦0.006%、N:≦0.010%、Si:≦0.5%、Cu:≦1.0%、Al:≦0.06%、P:≦0.015%、S:≦0.004%を含む。当該二相鋼は、主に細粒フェライトからなる第一相又は成分を約10体積%〜約60体積%含む。当該第一相は、平均結晶粒サイズが約5ミクロン又はその以下であるフェライトを有する。当該二相鋼は、更に第二相又は成分を約40体積%〜約90体積%含み、当該第二相又は成分は、細粒マルテンサイト、細粒下部ベイナイト、細粒粒状ベイナイト、細粒擬似上部ベイナイト又はそれらの任意の混合組織を含む。
C:0.18〜0.34%、
Si:0.10〜0.40%、
Mn:0.50〜1.40%、
Cr:0.20〜0.70%、
Mo:0.30〜0.90%、
Nb:0〜0.06%、
Ni:0.50〜2.40%、
V:0〜0.06%、
Ti:0.002〜0.04%、
Al:0.01〜0.08%、
B:0.0006〜0.0020%、
N≦0.0060%、
O≦0.0040%、
Ca:0〜0.0045%であり、
残部がFe及び他の不可避的不純物である。
下記工程で本発明に記載の低降伏比を有する超高強靭鋼板を製造する。
各化学元素の質量百分率含有量の配合比を具体的に表1に示したように制御する;
2)鋳造;
3)加熱:ビレットを1080〜1250℃に加熱する;
4)圧延:圧延後の鋼板を空冷し或いは水冷する;
5)冷却:室温まで冷却する;
6)焼入れ:焼入れ温度が860〜940℃であり、焼入れ後に水冷する;
7)焼戻し:焼戻し温度が150〜350℃であり、焼戻し後に空冷する。
Claims (8)
- 化学元素の質量百分率含有量が、
C:0.28〜0.34%、
Si:0.10〜0.20%、
Mn:0.50〜0.80%、
Cr:0.20〜0.40%、
Mo:0.50〜0.90%、
Nb:0〜0.02%、
Ni:0.90〜2.40%、
V:0.01〜0.04%、
Ti:0.002〜0.009%、
Al:0.01〜0.04%、
B:0.0006〜0.0010%、
N:0.003〜0.005%、
O:0.003〜0.0040%、
Ca:0.002〜0.0045%であり、
残部がFe及び他の不可避的不純物であることを特徴とする低降伏比を有する超高強靭鋼板であって、
前記鋼板は、降伏比が0.85未満であり、引張り強度が1610MPa以上であり、降伏強度が1320MPa以上であり、伸び率が10%よりも大きく、−20℃での衝撃エネルギーAkvが27Jよりも大きい、超高強靭鋼板。 - 炭素当量がCEV≦0.75%を満足し、かつ、炭素当量がCEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15であることを特徴とする、請求項1に記載の低降伏比を有する超高強靭鋼板。
- 微視組織がマルテンサイトと残留オーステナイトであることを特徴とする、請求項1又は2に記載の低降伏比を有する超高強靭鋼板。
- 溶錬、鋳造、加熱、圧延、冷却、焼入れ及び焼戻しの工程を含み、得られる鋼板の微視組織がマルテンサイトと残留オーステナイトであり;加熱工程において、ビレットを1080〜1250℃に加熱し;焼入れ工程において、焼入れ温度が860〜940℃であり;焼戻し工程において、焼戻し温度が150〜350℃であり、前記鋼板は、降伏比が0.85未満であり、引張り強度が1610MPa以上であり、降伏強度が1320MPa以上であり、伸び率が10%よりも大きく、−20℃での衝撃エネルギーAkvが27Jよりも大きいことを特徴とする、請求項1又は2に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 圧延後に鋼板を空冷し又は水冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 焼入れ後に鋼板を水冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 焼戻し後に鋼板を空冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 炭素当量がCEV≦0.75%を満足し、かつ、炭素当量がCEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15であることを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
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CN201310022288.8A CN103060715B (zh) | 2013-01-22 | 2013-01-22 | 一种具有低屈服比的超高强韧钢板及其制造方法 |
CN201310022288.8 | 2013-01-22 | ||
PCT/CN2013/090270 WO2014114159A1 (zh) | 2013-01-22 | 2013-12-24 | 一种具有低屈服比的超高强韧钢板及其制造方法 |
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WO2014114159A1 (zh) | 2014-07-31 |
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US10801090B2 (en) | 2020-10-13 |
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