JP4276576B2 - 大入熱溶接熱影響部靭性に優れた厚手高強度鋼板 - Google Patents
大入熱溶接熱影響部靭性に優れた厚手高強度鋼板 Download PDFInfo
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- JP4276576B2 JP4276576B2 JP2004124866A JP2004124866A JP4276576B2 JP 4276576 B2 JP4276576 B2 JP 4276576B2 JP 2004124866 A JP2004124866 A JP 2004124866A JP 2004124866 A JP2004124866 A JP 2004124866A JP 4276576 B2 JP4276576 B2 JP 4276576B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 65
- 239000010959 steel Substances 0.000 title claims description 65
- 238000003466 welding Methods 0.000 claims description 32
- 239000002131 composite material Substances 0.000 claims description 15
- 229910052719 titanium Inorganic materials 0.000 claims description 15
- 229910052796 boron Inorganic materials 0.000 claims description 12
- 229910052758 niobium Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 28
- 150000004767 nitrides Chemical class 0.000 description 28
- 238000000034 method Methods 0.000 description 23
- 229910000859 α-Fe Inorganic materials 0.000 description 22
- 229910001566 austenite Inorganic materials 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004349 Ti-Al Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910004692 Ti—Al Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 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
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000988 reflection electron microscopy Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Description
まず、Ti(Nb)窒化物の析出サイトとなる複合酸化物について検討した。その結果、複合酸化物の大きさは0.5μm以下であり、Al,Caを主体とする酸化物のほか、これらにMg,REMを含む複合酸化物においてもTi(Nb)窒化物が生成することを確認した。
0.29Ti+1.3B≦N≦0.29Ti+1.3B+0.15Nb・・・〔2〕式
(1)質量%で、
C :0.03〜0.14%、 Si:0.01〜0.30%、
Mn:0.8〜2.0%、 P :0.02%以下、
S :0.005%以下、 Nb:0.003〜0.050%、
Al:0.005〜0.040%、 Ti:0.005〜0.030%、
B :0.0010〜0.0050%、 N :0.0030〜0.0080%、
O :0.0010〜0.0050%
を含有し、
〔1〕式で表されるCeqの値が0.35〜0.40であり、かつ、
Nb,Ti,NおよびBの質量関係が〔2〕式を満たし、
さらに、質量%で、
Ca:0.0005〜0.0030%、 Mg:0.0005〜0.0050%、
REM:0.005〜0.030%
のうち1種または2種以上を含有し、残部Fe及び不可避的不純物からなり、円相当径が0.005〜0.5μmの複合酸化物を、100〜3000個/mm2含有することを特徴とする、大入熱溶接熱影響部靭性に優れた、板厚55〜80mmの厚手高強度鋼板。
Ceq=C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5・・〔1〕式
0.29Ti+1.3B≦N≦0.29Ti+1.3B+0.15Nb・・・〔2〕式
Ni:0.1〜3.0%、 Cu:0.1〜0.3%、
Cr:0.1〜0.5%、 Mo:0.03〜0.2%、
V :0.005〜0.050%
を1種または2種以上含有することを特徴とする、上記(1)に記載の大入熱溶接熱影響部靭性に優れた、板厚55〜80mmの厚手高強度鋼板。
Cは、鋼の強度を向上させる有効な成分として下限を0.03%とし、また過剰の添加は、炭化物やMAを多量に生成し、HAZ靭性を著しく低下させるので、上限を0.14%とした。
、0.0010%以下では十分な酸化物が得られないため、その範囲を0.0010%以上0.0050%以下とした。
Claims (2)
- 質量%で、
C :0.03〜0.14%、
Si:0.01〜0.30%、
Mn:0.8〜2.0%、
P :0.02%以下、
S :0.005%以下、
Nb:0.003〜0.050%、
Al:0.005〜0.040%、
Ti:0.005〜0.030%、
B :0.0010〜0.0050%、
N :0.0030〜0.0080%、
O :0.0010〜0.0050%
を含有し、
〔1〕式で表されるCeqの値が0.35〜0.40であり、かつ、
Nb,Ti,NおよびBの質量関係が〔2〕式を満たし、
さらに、質量%で、
Ca:0.0005〜0.0030%、
Mg:0.0005〜0.0050%、
REM:0.005〜0.030%
のうち1種または2種以上を含有し、残部Fe及び不可避的不純物からなり、円相当径が0.005〜0.5μmの複合酸化物を、100〜3000個/mm2含有することを特徴とする大入熱溶接熱影響部靭性に優れた、板厚55〜80mmの厚手高強度鋼板。
Ceq=C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5・〔1〕式
0.29Ti+1.3B≦N≦0.29Ti+1.3B+0.15Nb・・〔2〕式 - さらに、質量%で、
Ni:0.1〜3.0%、
Cu:0.1〜0.3%、
Cr:0.1〜0.5%、
Mo:0.03〜0.2%、
V :0.005〜0.050%
を1種または2種以上を含有することを特徴とする、請求項1に記載の大入熱溶接熱影響部靭性に優れた、板厚55〜80mmの厚手高強度鋼板。
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JP2005307261A JP2005307261A (ja) | 2005-11-04 |
JP4276576B2 true JP4276576B2 (ja) | 2009-06-10 |
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Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5343486B2 (ja) * | 2008-09-26 | 2013-11-13 | Jfeスチール株式会社 | 大入熱溶接用鋼材 |
JP5340839B2 (ja) * | 2009-07-17 | 2013-11-13 | 株式会社神戸製鋼所 | 溶接熱影響部の靭性に優れた鋼板 |
JP5842314B2 (ja) * | 2009-09-16 | 2016-01-13 | Jfeスチール株式会社 | 大入熱溶接用鋼 |
JP5493659B2 (ja) * | 2009-09-30 | 2014-05-14 | Jfeスチール株式会社 | 大入熱溶接熱影響部の靭性に優れた高強度鋼 |
JP5135560B2 (ja) * | 2010-11-22 | 2013-02-06 | 新日鐵住金株式会社 | 電子ビーム溶接継手及び電子ビーム溶接用鋼材とその製造方法 |
EP2594657B1 (en) * | 2010-11-22 | 2016-11-30 | Nippon Steel & Sumitomo Metal Corporation | Electron beam welded joint, steel material for use in electron beam welded joint, and manufacturing method thereof |
CN103834870B (zh) * | 2014-02-24 | 2017-01-04 | 内蒙古包钢钢联股份有限公司 | 含稀土高强钢板的生产工艺 |
EP3597783B1 (en) | 2017-03-15 | 2022-06-08 | Nippon Steel Corporation | H-section steel and method of producing the same |
CN111647806B (zh) * | 2020-05-14 | 2021-08-17 | 河北普阳钢铁有限公司 | 一种含Ti低合金钢轧制工艺 |
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