JP7460533B2 - 耐水素誘起割れ(hic)性が強化されたx-65グレードのapi 5l psl-2仕様に適合する鋼組成物及びその鋼の製造方法 - Google Patents
耐水素誘起割れ(hic)性が強化されたx-65グレードのapi 5l psl-2仕様に適合する鋼組成物及びその鋼の製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 185
- 239000010959 steel Substances 0.000 title claims description 185
- 239000000203 mixture Substances 0.000 title claims description 73
- 238000000034 method Methods 0.000 title claims description 21
- 238000005336 cracking Methods 0.000 title claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 title claims description 15
- 239000001257 hydrogen Substances 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 33
- 229910052799 carbon Inorganic materials 0.000 claims description 26
- 239000011572 manganese Substances 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 239000010955 niobium Substances 0.000 claims description 21
- 239000010936 titanium Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 229910052758 niobium Inorganic materials 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 12
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 11
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000001953 recrystallisation Methods 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 239000011575 calcium Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 239000012535 impurity Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 238000005096 rolling process Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 8
- 238000005204 segregation Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000000930 thermomechanical effect Effects 0.000 description 6
- 238000003917 TEM image Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 4
- 238000000879 optical micrograph Methods 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000009827 uniform distribution Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 229910011214 Ti—Mo Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009044 synergistic interaction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
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- 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
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
-
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
-
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- 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
-
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- 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
-
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- 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
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- 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
- C21D2211/002—Bainite
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- 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
- C21D2211/005—Ferrite
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- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0463—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment following hot rolling
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- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Description
FP=2.5*(0.5-Ceq)
式中、Ceqは組成物の炭素当量であり、次の等式で定義される:
Ceq=C+0.04*Mn+0.1*Ni+0.7*N-0.14*Si-0.04*Cr-0.1*Mo-0.24*Ti-0.7*S
これに対して、溶接割れの臨界金属パラメータ(Pcm)は
によって計算される。
一方、国際溶接学会(International Institute of Welding)(IIW)に基づく式は
である。
a.本開示の鋼組成物で鋼スラブを鋳造し、続いてスラブを加熱するステップ、
b.定義済みの仕上熱間圧延温度(FRT)を用い、再結晶停止温度(TNR)未満での圧下率で、スラブを制御熱間圧延するステップ、
c.熱間圧延鋼板を巻取温度まで制御冷却して、鋼を得るステップ
を含む方法を提供する。
a.本開示の鋼組成物で鋼スラブを鋳造し、続いてスラブを約1100℃~約1250℃の範囲の温度まで加熱するステップ、
b.約Ae3-50(℃)~約Ae3+50(℃))の仕上熱間圧延温度(FRT)を用い、再結晶停止温度(TNR)未満で、約70%~約90%の圧下率でスラブを熱間圧延するステップ、
c.熱間圧延鋼板を約500℃~約600℃の範囲の巻取温度まで制御冷却して、鋼を得るステップ
を含む。
以下の表1に示す組成物を有する鋼を鋳造して、2個のビレットとした。次に、ニオブ析出物が完全に溶解するように、鋳造したビレットを1200℃の温度まで1時間再加熱した。どちらのビレットも、TNR(1030~1040℃)未満での78%圧下率によって、同じ変形スケジュールで熱間圧延して、温度870℃の温度まで仕上圧延した。熱間圧延後、2個のビレットから処理した2枚の熱間圧延板を25~30℃/秒の冷却速度にて、それぞれ500℃と600℃の巻取温度まで冷却した。
例1で示した組成及び工程の詳細を備えた鋼を製造し、500℃及び600℃にて巻取った、得られた熱間圧延板を降伏強度(YS)、極限引張強度(UTS)、%伸び及びYS/UTS比について分析し、結果を以下の表3に示す。
例1で示した組成及び工程の詳細を備えた鋼を製造し、500℃及び600℃にて巻取った、得られた熱間圧延板の衝撃靭性を分析して、結果を下の表4に示す。
例1で示した組成及び工程の詳細を備えた鋼を製造し、500℃及び600℃にて巻取った、得られた熱間圧延板を、室温と氷点下温度での破壊靭性(CTOD)について分析して、結果を下の表5に与える。
例1で示した組成及び工程の詳細を備えた鋼を製造し、500℃及び600℃にて巻取った、得られた熱間圧延板を、そのHIC特性について、NACE規格TM0284-2005に従って試験した。100*20*T(Tは熱間圧延ストリップの厚さ)の標準サンプルを、H2Sで飽和させた、pHが3±0.5の蒸留水に溶解させた0.5%酢酸及び5%塩化ナトリウムからなる試験溶液に、陽圧下で96時間暴露させた。
例1で示した組成及び工程の詳細を備えた鋼を製造し、得られた熱間圧延板を、その中の炭素及びマンガンの分布について分析する。図6から認められるように、熱間圧延鋼の中厚領域では、炭素及びマンガンが均一に分布している。この均一分布は、本明細書の鋼を得るために用いた、本開示の特定の組成のために達成される。
Claims (12)
- 0.02%~0.06%の範囲の濃度の炭素(C)、0.7%~1.3%の範囲の濃度のマンガン(Mn)、0.06%~0.10%の範囲の濃度のニオブ(Nb)、0.015%~0.025%の範囲の濃度のチタン(Ti)、0.03%~0.10%の範囲の濃度のアルミニウム(Al)、0.1%~0.5%の範囲の濃度のケイ素(Si)、0.0001%~0.0060%の範囲の濃度の窒素(N)、0.0001%~0.0020%の範囲の濃度の硫黄(S)及び0.0001%~0.015%の範囲の濃度のリン(P)を含み、残部が鉄及び不可避的不純物からなる鋼組成物であって、
当該鋼組成物は、バナジウム(V)、銅(Cu)、ニッケル(Ni)及びモリブデン(Mo)を含まず、10%未満の割れ長さ比(CLR)、5%未満の割れ厚さ比(CTR)、2%未満の割れ感受性比(CSR)を示し、
前記鋼は、ポリゴナルフェライト及びベイニティックフェライト/アシキュラフェライトを含む微細構造(microstructure)を有し、鋼の微細構造中のベイニティックフェライト/アシキュラフェライトの量は、5%~10%の範囲であり、
前記組成物の炭素当量が0.35未満であり、当該炭素当量は、次の式:
によって計算される、
鋼組成物。 - 前記鋼が、API 5L PSL-2 X65仕様に適合し、水素誘起割れ(HIC)に対して高い耐性を与える、請求項1に記載の鋼組成物。
- 前記組成物が、0.0020%~0.0050%の範囲の濃度のカルシウム(Ca)をさらに含む、請求項1に記載の鋼組成物。
- Nb、Ti及びNの累積濃度が0.20%を超えない、請求項1に記載の鋼組成物。
- 前記組成物を有する前記鋼が、450MPa~550MPaの範囲の降伏強度(YS)を有し、535Mpa~650MPaの範囲の極限引張強度(UTS)及び少なくとも25%の伸び値を有する、請求項1に記載の鋼組成物。
- 前記組成物を有する前記鋼が、2μm~4μmの範囲の平均結晶粒径を有する、請求項1に記載の鋼組成物。
- 前記組成物を有する前記鋼が、160Hv~200Hvの範囲の硬度値を有する、請求項1に記載の鋼組成物。
- 前記鋼が少なくとも0.90mmの破壊靭性(CTOD-亀裂先端開口変位)値を有する、請求項1に記載の鋼組成物。
- 前記組成物を有する前記鋼が、非サワー用途に用いられるラインパイプ鋼である、請求項1に記載の鋼組成物。
- 請求項1に記載の組成物を有する鋼を製造する方法であって、
a.請求項1に記載の鋼組成物で鋼スラブを鋳造し、続いて前記スラブを1100℃~1250℃の範囲の温度まで加熱するステップ、
b.Ae3-50(℃)~Ae3+50(℃))の仕上熱間圧延温度を用い、再結晶停止温度(TNR)未満で、70%~90%の圧下率で前記スラブを熱間圧延するステップ、
c.熱間圧延鋼板を500℃~600℃の範囲の巻取温度まで制御冷却して、前記鋼を得るステップ
を含む、方法。 - ステップ(a)における前記加熱を、20分~2時間の範囲の期間にわたって行い、ステップ(c)における前記冷却を、毎秒10℃~50℃の範囲の速度で行う、請求項10に記載の方法。
- 前記温度における前記冷却により、ポリゴナルフェライト及びベイニティックフェライト/アシキュラフェライトを含む微細構造を有する鋼が生じる、請求項11に記載の方法。
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