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公开(公告)号:US11740038B2
公开(公告)日:2023-08-29
申请号:US16337695
申请日:2016-11-22
Applicant: POSCO
Inventor: Il Chan Jung , Jong Chul Kim , Jae Hong Shim , Deok Chan Ahn , Jin Suk Kim
CPC classification number: F28F21/083 , B22D11/002 , C21D6/002 , C21D8/0226 , C22C38/04 , C22C38/20 , C22C38/22 , C22C38/38
Abstract: A ferritic stainless steel for an exhaust system heat exchanger having excellent sound absorption properties and a method for manufacturing the same are disclosed. The ferritic stainless steel for an exhaust system heat exchanger having excellent sound absorption properties includes, by weight percent, 0.001 to 0.01% of C, 0.001 to 0.01% of N, 0.2 to 1% of Si, 0.1 to 2% of Mn, 10 to 30% of Cr, 0.001 to 0.1% of Ti, 0.001 to 0.015% of Al, 0.3 to 0.6% of Nb, 0.01 to 2.5% of Mo, and the balance of Fe and other unavoidable impurities, wherein the number of inclusions existing in a ferrite matrix and satisfying the following Formula 1 is 5 ea/mm2 or more.
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公开(公告)号:US11634801B2
公开(公告)日:2023-04-25
申请号:US16337629
申请日:2016-11-22
Applicant: POSCO
Inventor: Il Chan Jung , Jong Chul Kim , Jae Hong Shim , Deok Chan Ahn , Jin Suk Kim
IPC: C22C38/04 , C22C38/34 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/26 , C22C38/28 , F28F21/08
Abstract: Provided is a ferritic stainless steel for an exhaust system heat exchanger and a method of manufacturing the same. The ferritic stainless steel includes, in percent (%) by weight of the entire composition, 0.003 to 0.1% of carbon (C), 0.01 to 2.0% of silicon (Si), 0.01 to 1.5% of manganese (Mn), 0.05% or less of phosphorus (P), 0.005% or less of sulfur (S), 10 to 30% of chromium (Cr), 0.001 to 0.10% of titanium (Ti), 0.001 to 0.15% of aluminum (Al), 0.003 to 0.03% of nitrogen (N), 0.3 to 0.6% of niobium (Nb), 0.01 to 2.5% of molybdenum (Mo), and the remainder of iron (Fe) and other inevitable impurities, wherein TiN precipitates having a size of 0.1 μm or more are distributed in a surface layer of a ferrite matrix at a concentration of 2.5*104 ea/mm2 or less.
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3.
公开(公告)号:US20210310105A1
公开(公告)日:2021-10-07
申请号:US17265374
申请日:2018-11-02
Applicant: POSCO
Inventor: Jong Chul Kim , Wan-Yi Kim , Il Chan Jung , Jin-Suk Kim , Deok Chan Ahn
Abstract: A Ti, Nb-added ferritic stainless steel with excellent low-temperature toughness of weld zone according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.004 to 0.015%, N: 0.004 to 0.015%, Si: 0.01 to 0.7%, Mn: 0.01 to 0.7%, P: 0.0001 to 0.04%, S: 0.0001 to 0.005%, Cr: 10 to 30%, Al: 0.005 to 0.04%, Ti: 0.1 to 0.5%, Nb: 0.1 to 0.6%, Ca: 0.0001 to 0.003%, the remainder of iron (Fe) and other inevitable impurities, satisfies the following equation (1), and Al—Ca—Ti—Mg—O-based oxide and Ti—Nb—C—N carbonitride containing the oxide have an average diameter of 3 to 10 μm and a distribution density of 4/mm2 or more. {(Ti+0.5*Nb)*(C+N)}/Al>0.25 (1)
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公开(公告)号:US20210147966A1
公开(公告)日:2021-05-20
申请号:US16337629
申请日:2016-11-22
Applicant: POSCO
Inventor: Il Chan Jung , Jong Chul Kim , Jae Hong Shim , Deok Chan Ahn , Jin Suk Kim
IPC: C22C38/34 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/26 , C22C38/28 , C21D6/00 , C21D8/02 , C21D9/46 , F28F21/08
Abstract: Provided is a ferritic stainless steel for an exhaust system heat exchanger and a method of manufacturing the same. The ferritic stainless steel includes, in percent (%) by weight of the entire composition, 0.003 to 0.1% of carbon (C), 0.01 to 2.0% of silicon (Si), 0.01 to 1.5% of manganese (Mn), 0.05% or less of phosphorus (P), 0.005% or less of sulfur (S), 10 to 30% of chromium (Cr), 0.001 to 0.10% of titanium (Ti), 0.001 to 0.15% of aluminum (Al), 0.003 to 0.03% of nitrogen (N), 0.3 to 0.6% of niobium (Nb), 0.01 to 2.5% of molybdenum (Mo), and the remainder of iron (Fe) and other inevitable impurities, wherein TiN precipitates having a size of 0.1 μm or more are distributed in a surface layer of a ferrite matrix at a concentration of 2.5*104 ea/mm2 or less.
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