公开(公告)号：US10991954B2

公开(公告)日：2021-04-27

申请号：US16064891

申请日：2016-12-21

Applicant: POSCO

Inventor： Jong Hee Kim ,  Kwang Min Kim ,  Jae Hwa Lee ,  Yang Jin Chung ,  Ki Hoon Jo ,  Bo Sung Seo

IPC: H01M8/021 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C25F1/06 ,  H01M8/1018 ,  C23C22/50 ,  C23G1/08 ,  C21D7/02 ,  C21D1/28 ,  C21D7/04 ,  C22C38/22

Abstract: Stainless steel with improved hydrophilicity and contact resistance for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator, and a method of manufacturing the stainless steel Stainless steel are disclosed. Stainless steel for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator according to an embodiment of the present disclosure may include: by weight percent, 0 to 0.02% of C (excluding 0), 0 to 0.02% of N (excluding 0), 0 to 0.25% of Si (excluding 0), 0 to 0.2% of Mn (excluding 0), 0 to 0.04% of P (excluding 0), 0 to 0.02% of S (excluding 0), 20 to 34% of Cr, 0 to 0.6% of V (excluding 0), 0 to 0.5% of Ti (excluding 0), 0 to 0.5% of Nb (excluding 0), and the remainder comprising iron (Fe) and other unavoidable impurities, wherein a plurality of patterns may be formed on a surface of the stainless steel in a direction that is inclined with respect to a rolling direction, and the plurality of patterns are arranged repeatedly in the rolling direction.

公开(公告)号：US11993852B2

公开(公告)日：2024-05-28

申请号：US17253866

申请日：2018-06-20

Applicant: POSCO

Inventor： Jong Hee Kim ,  Kwang-Min Kim ,  Bo-Sung Seo

IPC: C23C22/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C23C22/78 ,  C25F1/06 ,  H01M8/021 ,  H01M8/0228

CPC classification number: C23C22/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C23C22/78 ,  C25F1/06 ,  H01M8/021 ,  H01M8/0228

Abstract: Disclosed is a method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator. The method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator according to an embodiment of the present disclosure includes: electrolyzing to remove a first passivation film formed on a cold-rolled thin sheet of a stainless steel comprising, in percent (%) by weight of the entire composition, C: greater than 0 to 0.1%, N: greater than 0 to 0.02%, Si: greater than 0 to 0.25%, Mn: greater than 0 to 0.2%, P: greater than 0 to 0.04%, S: greater than 0 to 0.02%, Cr: 22 to 34%, Ti: greater than 0 to 0.5%, Nb: greater than 0 to 0.5%, the remainder of iron (Fe) and other inevitable impurities; and immersing in a mixed acid solution of nitric acid and hydrofluoric acid to form a second passivation film on the stainless cold-rolled thin sheet.

公开(公告)号：US20210269920A1

公开(公告)日：2021-09-02

申请号：US17253866

申请日：2018-06-20

Applicant: POSCO

Inventor： Jong Hee Kim ,  Kwang-Min Kim ,  Bo-Sung Seo

IPC: C23C22/06 ,  C25F1/06 ,  H01M8/021 ,  H01M8/0228 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/02 ,  C22C38/00 ,  C23C22/78

Abstract: Disclosed is a method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator. The method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator according to an embodiment of the present disclosure includes: electrolyzing to remove a first passivation film formed on a cold-rolled thin sheet of a stainless steel comprising, in percent (%) by weight of the entire composition, C: greater than 0 to 0.1%, N: greater than 0 to 0.02%, Si: greater than 0 to 0.25%, Mn: greater than 0 to 0.2%, P: greater than 0 to 0.04%, S: greater than 0 to 0.02%, Cr: 22 to 34%, Ti: greater than 0 to 0.5%, Nb: greater than 0 to 0.5%, the remainder of iron (Fe) and other inevitable impurities; and immersing in a mixed acid solution of nitric acid and hydrofluoric acid to form a second passivation film on the stainless cold-rolled thin sheet.

公开(公告)号：US09777344B2

公开(公告)日：2017-10-03

申请号：US14368689

申请日：2012-12-26

Applicant: POSCO

Inventor： Jong Hee Kim ,  Ki-Hoon Jo ,  Yang Jin Chung ,  Yun Yong Lee ,  Sang Woo Lee

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/26 ,  C22C38/28 ,  C21D6/00 ,  H01M8/021 ,  C22C38/22 ,  C22C38/24 ,  C21D1/26

CPC classification number: C21D8/0263 ,  C21D1/26 ,  C21D6/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  H01M8/021 ,  Y02P70/56

Abstract: Provided is a ferrite-based stainless steel having superior moldability when molding a fuel cell divider sheet from a material by controlling yield point elongation in accordance with alloy components. The ferrite-based stainless steel comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses Formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability. 9.1C−1.76V+5.37(C+N)/Ti−1.22Nb≦0.7.  Formula (1)

公开(公告)号：US11923580B2

公开(公告)日：2024-03-05

申请号：US15747973

申请日：2016-07-29

Applicant: POSCO

Inventor： Kwang Min Kim ,  Jong Hee Kim ,  Ki Hoon Jo ,  Bo Sung Seo

IPC: H01M8/1018 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23F1/28 ,  C23G1/08 ,  C25F3/06 ,  C25F5/00 ,  H01M8/021 ,  H01M8/0217 ,  H01M8/0228 ,  H01M8/1004

CPC classification number: H01M8/1018 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23F1/28 ,  C23G1/086 ,  C25F3/06 ,  C25F5/00 ,  H01M8/021 ,  H01M8/0219 ,  H01M8/0228 ,  H01M8/1004 ,  Y02P70/50

Abstract: Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr/Fe atomic weight ratio in a 1 nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costs are reduced and productivity can be improved.

公开(公告)号：US20140338796A1

公开(公告)日：2014-11-20

申请号：US14368689

申请日：2012-12-26

Applicant: POSCO

Inventor： Jong Hee Kim ,  Ki-Hoon Jo ,  Yang Jin Chung ,  Yun Yong Lee ,  Sang Woo Lee

IPC: C21D8/02 ,  C22C38/24 ,  C22C38/00 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/28 ,  C22C38/22

CPC classification number: C21D8/0263 ,  C21D1/26 ,  C21D6/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  H01M8/021 ,  Y02P70/56

Abstract: Provided is a ferrite-based stainless steel having superior moldability when molding a fuel cell divider sheet from a material by controlling yield point elongation in accordance with alloy components. The ferrite-based stainless steel comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses Formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability. 9.1C−1.76V+5.37(C+N)/Ti−1.22Nb≦0.7.  Formula (1)

Abstract translation: 提供一种铁素体不锈钢，其通过根据合金成分控制屈服点伸长率从材料成型燃料电池分隔片时具有优异的成型性。 铁素体系不锈钢的重量百分比不超过C 0.02的0.02％ 不超过0.02％的N; 不超过0.4％的Si; 不超过0.2％的Mn; 不超过0.04％的P; 不超过0.02％的S; 25.0-32.0％的Cr; 0-1.0％的Cu; 不超过0.8％的Ni; 不超过0.01-0.5％的Ti; 不超过0.01-0.5％的Nb; 不超过0.01-1.5％的V; 残余的Fe和不可避免的元素，其中以钢的重量％计的Ti，Nb，V，C和N的含量使用式（1）使材料的屈服点伸长率不超过1.1％，以及 其中钢材具有优异的成型性。 9.1C-1.76V + 5.37（C + N）/ Ti-122Nb＆nlE; 0.7。 公式1）