WO2023063288A1 - 冷延鋼板及びその製造方法、並びに溶接継手 - Google Patents

冷延鋼板及びその製造方法、並びに溶接継手 Download PDF

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WO2023063288A1
WO2023063288A1 PCT/JP2022/037779 JP2022037779W WO2023063288A1 WO 2023063288 A1 WO2023063288 A1 WO 2023063288A1 JP 2022037779 W JP2022037779 W JP 2022037779W WO 2023063288 A1 WO2023063288 A1 WO 2023063288A1
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steel sheet
cold
content
rolled steel
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PCT/JP2022/037779
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English (en)
French (fr)
Japanese (ja)
Inventor
亜梨紗 長谷川
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to KR1020247007002A priority Critical patent/KR20240046196A/ko
Priority to US18/682,465 priority patent/US20240344161A1/en
Priority to JP2023554513A priority patent/JP7741417B2/ja
Priority to MX2024002702A priority patent/MX2024002702A/es
Priority to EP22880983.6A priority patent/EP4417726A4/en
Priority to CN202280060025.3A priority patent/CN117916398A/zh
Publication of WO2023063288A1 publication Critical patent/WO2023063288A1/ja
Anticipated expiration legal-status Critical
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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
    • C21D2211/008—Martensite

Definitions

  • Ti 0.001% to 0.100%
  • Ti is an element that combines with N to form TiN and contributes to grain refinement of ⁇ . By refining the ⁇ grains, the P content at the ⁇ grain boundaries can be suppressed. In order to obtain this effect, the Ti content is made 0.001% or more. The Ti content is preferably 0.005% or more. On the other hand, when the Ti content is excessive, the recrystallization temperature rises, the metal structure of the cold-rolled steel sheet becomes uneven, and formability is impaired. Therefore, the Ti content should be 0.100% or less.
  • S 0.0100% or less
  • S is an element contained in steel as an impurity, and is an element that forms sulfide-based inclusions and deteriorates the formability of the steel sheet.
  • the S content is preferably as small as possible, and although it may be 0%, the S content should be 0.0100% or less in consideration of the S removal time and cost.
  • the S content is preferably 0.0050% or less, more preferably 0.0040% or less, still more preferably 0.0030% or less. From the viewpoint of costs such as refining, the S content may be 0.0001% or more.
  • the austenite grain size is refined by recrystallization during rolling, and by using this refined grain boundary as a diffusion path, the diffusion of Mn, P, etc. is promoted and segregation is alleviated. . If even one sheet thickness reduction rate at each stand is less than 30%, or if the rolling temperature at the n-th stand is higher than 900°C, the hot-rolled structure becomes coarse and mixed grains, and the annealing process described later. Later tissues also coarsen. If the hot rolling completion temperature is lower than 830° C., the rolling reaction force increases, making it difficult to stably obtain the target thickness. Therefore, the rolling temperature at the final stand is preferably 830° C. or higher.

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  • Chemical & Material Sciences (AREA)
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  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
PCT/JP2022/037779 2021-10-13 2022-10-11 冷延鋼板及びその製造方法、並びに溶接継手 Ceased WO2023063288A1 (ja)

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US18/682,465 US20240344161A1 (en) 2021-10-13 2022-10-11 Cold-rolled steel sheet, method for manufacturing same, and welded joint
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JP2013104081A (ja) 2011-11-11 2013-05-30 Kobe Steel Ltd 耐遅れ破壊性に優れた高強度鋼板およびその製造方法
WO2020026838A1 (ja) 2018-07-31 2020-02-06 Ｊｆｅスチール株式会社 薄鋼板及びその製造方法
WO2020129403A1 (ja) * 2018-12-21 2020-06-25 Ｊｆｅスチール株式会社 鋼板、部材およびこれらの製造方法
WO2020129402A1 (ja) * 2018-12-21 2020-06-25 Ｊｆｅスチール株式会社 鋼板、部材およびこれらの製造方法
JP6729835B1 (ja) 2018-10-31 2020-07-22 Ｊｆｅスチール株式会社 高強度鋼板およびその製造方法
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WO2020209275A1 (ja) * 2019-04-11 2020-10-15 日本製鉄株式会社 鋼板及びその製造方法
JP2021168157A (ja) 2017-01-06 2021-10-21 ナイキ イノベイト シーブイ 自動ショッピングアシスタントを使用したパーソナライズショッピングのためのシステム、プラットフォームおよび方法

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JP2013104081A (ja) 2011-11-11 2013-05-30 Kobe Steel Ltd 耐遅れ破壊性に優れた高強度鋼板およびその製造方法
JP2021168157A (ja) 2017-01-06 2021-10-21 ナイキ イノベイト シーブイ 自動ショッピングアシスタントを使用したパーソナライズショッピングのためのシステム、プラットフォームおよび方法
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See also references of EP4417726A4

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