JP4009313B2 - 溶接性に優れた高強度鋼材およびその製造方法 - Google Patents
溶接性に優れた高強度鋼材およびその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 162
- 239000010959 steel Substances 0.000 title claims description 162
- 239000000463 material Substances 0.000 title claims description 114
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 150000004767 nitrides Chemical class 0.000 claims description 125
- 238000005121 nitriding Methods 0.000 claims description 77
- 238000001556 precipitation Methods 0.000 claims description 50
- 239000007789 gas Substances 0.000 claims description 42
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000010936 titanium Substances 0.000 description 146
- 238000000034 method Methods 0.000 description 26
- 239000002244 precipitate Substances 0.000 description 25
- 238000005096 rolling process Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 18
- 238000000465 moulding Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 229910052719 titanium Inorganic materials 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 11
- 238000003466 welding Methods 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 8
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000005238 degreasing Methods 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
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- CFJRPNFOLVDFMJ-UHFFFAOYSA-N titanium disulfide Chemical compound S=[Ti]=S CFJRPNFOLVDFMJ-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/08—Extraction of nitrogen
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Description
Ti*=[Ti]−48×([C]/12+[S]/32) …(1)
式中、[ ]は、鋼材中に含まれる各元素の含有量(%)を示している。
Ti*=[Ti]−48×([C]/12+[S]/32) …(1)
式中、[ ]は、鋼材中に含まれる各元素の含有量(%)を示している。
Cは、鋼材の強度を確保するために重要な元素であるが、鋼材の金属組織をフェライト単相にするには、Cは0.05%以下であるのがよい。またCはTiと結合してTi炭化物を形成し、有効Ti*量を低下させるため、Cはできるだけ少ない方がよい。Cはより好ましくは0.03%以下であり、更に好ましくは0.01%以下である。
Sは、Tiと結合してTi硫化物[二硫化チタン(TiS2)]を形成し、有効Ti*量を低下させるため、Sはできるだけ少ない方がよい。従ってSは0.05%以下であるのが好ましく、より好ましくは0.03%以下、更に好ましくは0.01%以下である。なお、Sは不可避的に0.0005%程度含有している。
Siを過剰に含有するとメッキ性が悪くなる。従ってSiは1%以下であることが好ましく、より好ましくは0.5%以下、更に好ましくは0.3%以下である。但し、Siは、固溶強化によって鋼材の強度を高めるのに作用する。従ってSiは0.01%以上(好ましくは0.05%以上)含有していてもよい。
Mnを過剰に含有するとメッキ性が悪くなる。従ってMnは1.5%以下であることが好ましく、より好ましくは1%以下、更に好ましくは0.5%以下である。但し、Mnは、Siと同様に、固溶強化によって鋼材の強度を高めるのに作用する。従ってMnは0.01%以上(好ましくは0.1%以上)含有していてもよい。
Pを過剰に含有すると、溶接割れを起こし易くなる。従ってPは0.05%以下であることが好ましく、より好ましくは0.03%以下、更に好ましくは、0.01%以下である。なお、Pは不可避的に0.001%程度含有している。
Alは、Nと結合してAl窒化物を形成し、鋼中のNを消費してTi窒化物の形成を阻害する元素である。またAl窒化物を形成することで鋼材に含まれるN量を増大し、溶接性を劣化させる。従ってAlは0.05%以下であることが好ましく、より好ましくは0.04%以下、更に好ましくは0.03%以下である。なお、Alを脱酸元素として添加する場合には0.01%以上含有していてもよく、より好ましくは0.02%以上である。
下記表1に示す成分組成の鋼(残部はFeおよび不可避不純物)を真空溶解して得られた圧延素材を、1250℃に加熱し、仕上げ温度を950℃、巻取り温度を600℃として熱間圧延し、厚み2mmの熱間圧延材を得た。表1には、熱間圧延材に含まれるC,SおよびTi含有量から上記(1)式で算出した有効Ti*量を合わせて示す。
成分組成が上記表1に示した鋼種Aの素地鋼板(厚み1mm×幅40mm×長さ210mm)を、ハットチャンネル形にプレス成形して成形品を得た。ハットチャンネル形の成形高さは60mm、パンチ底幅は48mmである。
歪量=(プレス成形前の板厚−プレス成形後の板厚)/プレス成形前の板厚×100
Claims (8)
- N量が0.020%(質量%の意味。以下、化学成分について同じ。)以下(0%を含まない)、
C :0.05%以下(0%を含まない)、
Si:1%以下(0%を含まない)、
Mn:1.5%以下(0%を含まない)、
P :0.05%以下(0%を含まない)、
S :0.05%以下(0%を含まない)、
Al:0.05%以下(0%を含まない)、
Ti:0.02〜0.3%、を含有し、
残部が鉄および不可避不純物からなる高強度鋼材であり、
この鋼材の金属組織はフェライト単相で、且つ最大径が20nm以下のTi窒化物が、1μm2当たり250個以上整合析出していることを特徴とする溶接性に優れた高強度鋼材。 - 最大径が6nm以下のTi窒化物の個数が、最大径が20nm以下のTi窒化物の個数に対して80%以上である請求項1に記載の高強度鋼材。
- 前記鋼材は、下記(1)式で算出される有効Ti*量が0.02〜0.08%である請求項1または2に記載の高強度鋼材。
Ti*=[Ti]−48×([C]/12+[S]/32) …(1)
式中、[ ]は、鋼材中に含まれる各元素の含有量(%)を示している。 - 請求項1〜3のいずれかに記載の高強度鋼材を製造する方法であって、
(a)Ti:0.02〜0.3%、
N:0.005%以下(0%を含まない)、
C:0.05%以下(0%を含まない)、
Si:1%以下(0%を含まない)、
Mn:1.5%以下(0%を含まない)、
P:0.05%以下(0%を含まない)、
S:0.05%以下(0%を含まない)、
Al:0.05%以下(0%を含まない)を含有し、
残部が鉄および不可避不純物からなる素地鋼材を、窒化ガス含有雰囲気下で温度500〜610℃に加熱する窒化工程、
(b)窒化した鋼材を、窒化ガスを含まない雰囲気下で温度500〜610℃で放置する脱窒素工程、
(c)脱窒素した鋼材を温度640〜750℃に加熱するTi窒化物析出工程、
をこの順で行なうことを特徴とする溶接性に優れた高強度鋼材の製造方法。 - 前記窒化工程の雰囲気ガスが、水素、窒素、およびアンモニアを含む混合ガスである請求項4に記載の製造方法。
- 前記脱窒素工程の雰囲気ガスが、非酸化性ガスである請求項4または5に記載の製造方法。
- 前記Ti窒化物析出工程の雰囲気ガスが、非酸化性ガスである請求項4〜6のいずれかに記載の製造方法。
- 前記窒化処理または前記窒化工程に先立って、前記素地鋼材を成形加工する請求項4〜7のいずれかに記載の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007007402A JP4009313B2 (ja) | 2006-03-17 | 2007-01-16 | 溶接性に優れた高強度鋼材およびその製造方法 |
KR1020087022703A KR101033747B1 (ko) | 2006-03-17 | 2007-03-12 | 용접성이 우수한 고강도 강재 및 그 제조 방법 |
PCT/JP2007/054786 WO2007108344A1 (ja) | 2006-03-17 | 2007-03-12 | 溶接性に優れた高強度鋼材およびその製造方法 |
CN2007800053045A CN101384742B (zh) | 2006-03-17 | 2007-03-12 | 焊接性优异的高强度钢材及其制造方法 |
US12/279,552 US8163107B2 (en) | 2006-03-17 | 2007-03-12 | High-strength steel excellent in weldability and process for production thereof |
GB0819048A GB2450065B (en) | 2006-03-17 | 2007-03-12 | High-strength steel material excellent in weldability and method of manufacturing the same |
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JP2006075303 | 2006-03-17 | ||
JP2007007402A JP4009313B2 (ja) | 2006-03-17 | 2007-01-16 | 溶接性に優れた高強度鋼材およびその製造方法 |
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JP2007277701A JP2007277701A (ja) | 2007-10-25 |
JP4009313B2 true JP4009313B2 (ja) | 2007-11-14 |
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Country Status (6)
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US (1) | US8163107B2 (ja) |
JP (1) | JP4009313B2 (ja) |
KR (1) | KR101033747B1 (ja) |
CN (1) | CN101384742B (ja) |
GB (1) | GB2450065B (ja) |
WO (1) | WO2007108344A1 (ja) |
Families Citing this family (9)
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JP4502646B2 (ja) | 2004-01-21 | 2010-07-14 | 株式会社神戸製鋼所 | 加工性、疲労特性および表面性状に優れた高強度熱延鋼板 |
EP2180075B1 (en) * | 2007-08-01 | 2017-05-03 | Kabushiki Kaisha Kobe Seiko Sho | High-strength steel sheet excellent in bendability and fatigue strength |
JP5194858B2 (ja) * | 2008-02-08 | 2013-05-08 | Jfeスチール株式会社 | 高強度熱延鋼板およびその製造方法 |
EP2635388A1 (de) * | 2010-11-03 | 2013-09-11 | Johnson Controls GmbH | Verfahren zum rollformen von profilen und dadurch hergestelles strukturteil |
US10974349B2 (en) * | 2010-12-17 | 2021-04-13 | Magna Powertrain, Inc. | Method for gas metal arc welding (GMAW) of nitrided steel components using cored welding wire |
JP5656908B2 (ja) | 2012-04-18 | 2015-01-21 | Dowaサーモテック株式会社 | 窒化鋼部材およびその製造方法 |
EP3127506B1 (en) * | 2014-04-04 | 2020-01-08 | Hitachi Metals, Ltd. | Magnet structure for dental magnetic attachment |
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JPS52128821A (en) * | 1976-04-12 | 1977-10-28 | Nippon Steel Corp | Preparation of high tensile steel having superior low temperature toughness and yield point above 40 kg/pp2 |
JP3115746B2 (ja) * | 1993-08-19 | 2000-12-11 | 新日本製鐵株式会社 | 耐デント性ならびに耐面ひずみ性に優れた非時効深絞り用冷延鋼板の製造方法 |
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JP3172505B2 (ja) * | 1998-03-12 | 2001-06-04 | 株式会社神戸製鋼所 | 成形性に優れた高強度熱延鋼板 |
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KR100482208B1 (ko) * | 2000-11-17 | 2005-04-21 | 주식회사 포스코 | 침질처리에 의한 용접구조용 강재의 제조방법 |
EP1215297B1 (en) * | 2000-12-15 | 2007-08-15 | Kabushiki Kaisha Kobe Seiko Sho | Steel sheet excellent in ductility and strength stability after heat treatment |
JP4074536B2 (ja) * | 2002-03-19 | 2008-04-09 | 新日本製鐵株式会社 | 母材および溶接熱影響部の靱性に優れた鋼材 |
JP3931230B2 (ja) * | 2002-10-17 | 2007-06-13 | 独立行政法人物質・材料研究機構 | 窒化層を有する超微細粒鋼 |
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JP2007009325A (ja) * | 2005-05-30 | 2007-01-18 | Jfe Steel Kk | 耐低温割れ性に優れた高張力鋼材およびその製造方法 |
JP4502947B2 (ja) * | 2005-12-27 | 2010-07-14 | 株式会社神戸製鋼所 | 溶接性に優れた鋼板 |
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CN101384742B (zh) | 2011-01-26 |
WO2007108344A1 (ja) | 2007-09-27 |
JP2007277701A (ja) | 2007-10-25 |
CN101384742A (zh) | 2009-03-11 |
GB2450065B (en) | 2011-08-17 |
WO2007108344A9 (ja) | 2008-02-28 |
US8163107B2 (en) | 2012-04-24 |
US20090065098A1 (en) | 2009-03-12 |
GB2450065A (en) | 2008-12-10 |
KR20080097467A (ko) | 2008-11-05 |
GB0819048D0 (en) | 2008-11-26 |
KR101033747B1 (ko) | 2011-05-09 |
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