Alloying element-saving hot rolled duplex stainless steel material, clad steel plate having duplex stainless steel as cladding material therefor, and production method for same

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United States of America Patent

PATENT NO 9862168
APP PUB NO 20130288074A1
SERIAL NO

13978743

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Abstract

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This alloying element-saving hot rolled duplex stainless steel material contains, by mass %, C: 0.03% or less, Si: 0.05% to 1.0%, Mn: 0.5% to 7.0%, P: 0.05% or less, S: 0.010% or less, Ni: 0.1% to 5.0%, Cr: 18.0% to 25.0%, N: 0.05% to 0.30% and Al: 0.001% to 0.05%, with a remainder being Fe and inevitable impurities, wherein the alloying element-saving hot rolled duplex stainless steel material is produced by hot rolling, a chromium nitride precipitation temperature TN is in a range of 960° C. or lower, a yield strength is 50 MPa or more higher than that of a hot rolled steel material which is subjected to a solution heat treatment, and the alloying element-saving hot rolled duplex stainless steel material is as hot rolled state, and is not subjected to a solution heat treatment. This clad steel plate includes a duplex stainless steel as a cladding material, the duplex stainless steel has the above composition, and the chromium nitride precipitation temperature TN is in a range of 800° C. to 970° C.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL STAINLESS STEEL CORPORATION8-2 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 1000005

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishida, Kazuhiko Kitakyushu, JP 2 2
Kajimura, Haruhiko Hikari, JP 20 160
Oikawa, Yuusuke Hikari, JP 10 75
Tsuge, Shinji Hikari, JP 19 128
Yamamoto, Yoichi Kitakyushu, JP 65 701

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