Title:
HIGH-Ni ALLOY THICK STEEL SHEET HAVING EXCELLENT WELD HIGH-TEMPERATURE CRACKING RESISTANCE, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/166926
Kind Code:
A1
Abstract:
Provided is a high-Ni alloy thick steel sheet having excellent weld high-temperature cracking resistance, the steel sheet being characterized by containing, in % by mass, 0.15% or less of C, 0.05 to 1.0% of Si, 0.05 to 2.0% of Mn, 0.035% or less of P, 0.0015% or less of S, 16 to 28% of Cr, 18 to 65% of Ni, 0.01 to 1.0% of Al, 0.15 to 1.5% of Ti, 0.0002 to 0.0030% of B, 0.05% or less of N, 0.003% or less of O, 0.01 to 10% of Mo, 0.01 to 4.0% of Cu, 0.01 to 3.0% of Co, 0.01 to 0.5% of V, 0.0050% or less of Mg and a remainder comprising Fe and impurities, having a grain size number G as prescribed by JIS G0552 of 1.0 or more, and having a standard deviation of a solid solution Ti concentration distribution in the thickness direction of 0.045% or less. Also provided is a method for producing a high-Ni alloy thick steel sheet having excellent weld high-temperature cracking resistance, the method being characterized by comprising performing such a thermal treatment that the retention time at 1200°C or higher is set to 8 hours or longer in a previous step for a final hot rolling step.
Inventors:
NISHIDA YUKIHIRO (JP)
YOSHIOKA YUUMA (JP)
TSUGE SHINJI (JP)
YOSHIOKA YUUMA (JP)
TSUGE SHINJI (JP)
Application Number:
PCT/JP2023/003970
Publication Date:
September 07, 2023
Filing Date:
February 07, 2023
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP (JP)
International Classes:
C22C19/05; C21D8/02; C22C30/02; C22C38/00; C22C38/58; C22C38/60; C22F1/00; C22F1/10
Domestic Patent References:
| WO2018181570A1 | 2018-10-04 | |||
| WO2022220242A1 | 2022-10-20 |
Foreign References:
| JP2014084493A | 2014-05-12 | |||
| JPS5856024B2 | 1983-12-13 |
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
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