JPWO2011148754A1 - 厚鋼板の製造方法 - Google Patents
厚鋼板の製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 239000002344 surface layer Substances 0.000 claims abstract description 32
- 230000001186 cumulative effect Effects 0.000 claims abstract description 13
- 230000009467 reduction Effects 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 28
- 150000004767 nitrides Chemical class 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 50
- 239000010953 base metal Substances 0.000 abstract description 14
- 238000005266 casting Methods 0.000 abstract description 9
- 229910052758 niobium Inorganic materials 0.000 abstract description 5
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 23
- 238000003466 welding Methods 0.000 description 16
- 239000002245 particle Substances 0.000 description 15
- 229910052761 rare earth metal Inorganic materials 0.000 description 14
- 230000009466 transformation Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000005098 hot rolling Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- 150000003568 thioethers Chemical class 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011246 composite particle Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- -1 oxides Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Abstract
Description
C :0.03〜0.16%、
Si:0.03〜0.5%、
Mn:0.3〜2.0%、
Nb:0.005〜0.030%、
Ti:0.003〜0.050%、
Al:0.002〜0.10%、
N :0.0020〜0.0100%
を含有し、
P :0.020%以下、
S :0.010%以下
に制限し、残部がFeおよび不可避的不純物からなり、かつ下記(1)、(2)式を満足する組成の鋼を、1100〜1300℃の温度範囲における鋳片厚中心部の冷却速度が0.1℃/s以上となるように冷却して鋳造し、表層部において円相当径で0.02〜0.05μmのTi含有窒化物が1mm2当たり7.0×104個以上、中心部において円相当径で0.05〜0.2μmのTi含有窒化物が1mm2当たり5.0×104個以上存在する鋳片を製造し、該鋳片を、下記(3)、(4)式を満たす条件で加熱し、900℃以上の温度で累積圧下率30%以上の粗圧延を行い、さらにAr3以上880℃以下の温度で、累積圧下率40%以上の仕上圧延を行い、引き続きAr3以上の温度から、板厚平均で5℃/s以上の冷却速度で550℃以下の温度まで加速冷却を行うことを特徴とする厚鋼板の製造方法。
0.32≦[C]+0.15[Mn]+3.8[Nb]≦0.39 ・・・(1)
1.5≦[Ti]/[N]≦3.0 ・・・(2)
56000/(1.2−0.18×log[Nb])≦(T+273)×{log(t)+25}≦91000/(1.9−0.18×log[Ti]) ・・・(3)
t≧30 ・・・(4)
ただし、[X]:元素Xの添加量(質量%)、T:加熱温度(℃)、t:保持時間(分)
Cu:1.5%以下、
Cr:0.5%以下、
Mo:0.5%以下、
Ni:2.0%以下、
V:0.10%以下、
B:0.0030%以下
Mg:0.0050%以下、
Ca:0.0030%以下、
REM:0.010%以下
の1種または2種以上を含有することを特徴とする上記(1)又は(2)に記載の厚鋼板の製造方法。
56000/(1.2−0.18×log[Nb])≦PH≦91000/(1.9−0.18×log[Ti]) ・・・・・・・ (3)
ただし、PH=(T+273)×{log(t)+25}
t≧30 ・・・・・・・ (4)
ただし、[X]:元素Xの添加量(質量%)、T:加熱温度(℃)、t:保持時間(分)
0.32≦[C]+0.15[Mn]+3.8[Nb]≦0.39・・・(1)上式の[C]、[Mn]、[Nb]は、各元素の添加量(質量%)であり、係数は焼入れ性への寄与から実験的に求めた。[C]+0.15[Mn]+3.8[Nb]が0.32未満であると、強度が不十分になる。一方、特に、Mn、Nbは、中心偏析を抑制することが難しい元素であり、[C]+0.15[Mn]+3.8[Nb]が0.39を超えると中心偏析が顕著になり、大入熱溶接継手のHAZ靭性が低下してしまう。HAZ靭性の改善のため、0.38又は0.37を上限としてもよく、強度向上のため0.33を下限としてもよい。
1.5≦[Ti]/[N]≦3.0 ・・・(2)
上式の[Ti]、[N]は、各元素の添加量(質量%)である。
Ar3=910−310C−80Mn−20Cu−15Cr−55Ni−80Mo+0.35+0.35(t−8)
ここで、tは板厚(mm)である。また、表4および5に鋳片のTiN個数密度、母材の強度および靭性、HAZ靭性を示す。
Claims (3)
- 質量%で、
C :0.03〜0.16%、
Si:0.03〜0.5%、
Mn:0.3〜2.0%、
Nb:0.005〜0.030%、
Ti:0.003〜0.050%、
Al:0.002〜0.10%、
N :0.0020〜0.0100%
を含有し、
P :0.020%以下、
S :0.010%以下
に制限し、残部がFeおよび不可避的不純物からなり、かつ下記(1)、(2)式を満足する組成の鋼を、1100〜1300℃の温度範囲における鋳片厚中心部の冷却速度が0.1℃/s以上となるように冷却して鋳造し、表層部において円相当径で0.02〜0.05μmのTi含有窒化物が1mm2当たり7.0×104個以上、中心部において円相当径で0.05〜0.2μmのTi含有窒化物が1mm2当たり5.0×104個以上存在する鋳片を製造し、該鋳片を、下記(3)、(4)式を満たす条件で加熱し、900℃以上の温度で累積圧下率30%以上の粗圧延を行い、さらにAr3以上880℃以下の温度で、累積圧下率40%以上の仕上圧延を行い、引き続きAr3以上の温度から、板厚平均で5℃/s以上の冷却速度で550℃以下の温度まで加速冷却を行うことを特徴とする厚鋼板の製造方法。
0.32≦[C]+0.15[Mn]+3.8[Nb]≦0.39 ・・・(1)
1.5≦[Ti]/[N]≦3.0 ・・・(2)
56000/(1.2−0.18×log[Nb])≦(T+273)×{log(t)+25}≦91000/(1.9−0.18×log[Ti]) ・・・(3)
t≧30 ・・・(4)
ただし、[X]:元素Xの添加量(質量%)、T:再加熱温度(℃)、t:保持時間(分) - 前記加速冷却終了後、650℃以下の温度で熱処理することを特徴とする請求項1記載の厚鋼板の製造方法。
- さらに、前記鋼が質量%で、
Cu:1.5%以下、
Cr:0.5%以下、
Mo:0.5%以下、
Ni:2.0%以下、
V:0.10%以下、
B:0.0030%以下
Mg:0.0050%以下、
Ca:0.0030%以下、
REM:0.010%以下
の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又は2に記載の厚鋼板の製造方法。
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JP5796379B2 (ja) * | 2011-07-11 | 2015-10-21 | Jfeスチール株式会社 | 大入熱溶接熱影響部のctod特性に優れる溶接構造用鋼およびその製造方法 |
JP5733424B2 (ja) * | 2011-12-27 | 2015-06-10 | Jfeスチール株式会社 | 脆性き裂伝播停止特性に優れた構造用高強度厚鋼板およびその製造方法 |
JP6165088B2 (ja) * | 2013-03-29 | 2017-07-19 | 株式会社神戸製鋼所 | 耐水素誘起割れ性と溶接熱影響部の靭性に優れた鋼板およびラインパイプ用鋼管 |
CN103627980B (zh) * | 2013-11-25 | 2016-01-20 | 首钢总公司 | 低温大壁厚x80hd大变形管线钢及其生产方法 |
KR101758520B1 (ko) * | 2015-12-23 | 2017-07-17 | 주식회사 포스코 | 열간 저항성이 우수한 고강도 구조용 강판 및 그 제조방법 |
KR102209581B1 (ko) * | 2018-11-29 | 2021-01-28 | 주식회사 포스코 | 용접열영향부 인성이 우수한 강재 및 이의 제조방법 |
KR102237486B1 (ko) * | 2019-10-01 | 2021-04-08 | 주식회사 포스코 | 중심부 극저온 변형시효충격인성이 우수한 고강도 극후물 강재 및 그 제조방법 |
KR20230041045A (ko) | 2020-11-05 | 2023-03-23 | 제이에프이 스틸 가부시키가이샤 | 강판 및 그 제조 방법 |
JP7243916B2 (ja) * | 2020-11-05 | 2023-03-22 | Jfeスチール株式会社 | 鋼板および鋼板の製造方法 |
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JPH0853734A (ja) * | 1994-08-10 | 1996-02-27 | Nippon Steel Corp | 大入熱溶接熱影響部靭性の優れた溶接用鋼材の製造方法 |
JP2001288512A (ja) * | 2000-04-05 | 2001-10-19 | Nippon Steel Corp | 靱性と延性に優れた高張力鋼の製造方法 |
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