公开(公告)号：US20190010588A1

公开(公告)日：2019-01-10

申请号：US16065710

申请日：2016-12-21

Applicant: POSCO

Inventor： Hyung Gu KANG ,  Jeom Yong CHOI ,  Dong Chul CHAE ,  Jee Hyun YU ,  Gyu Jin JO

IPC: C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: Disclosed is an austenitic stainless steel with increased workability. The austenitic stainless steel includes, based on % by weight, silicon (Si): 0.1 to 0.65%, manganese (Mn): 0.2 to 3.0%, nickel (Ni): 6.5 to 10.0%, chromium (Cr): 16.5 to 20.0%, copper (Cu): 6.0% or less (excluding 0), the sum of carbon (C) and nitrogen (N): 0.08% or less (excluding 0), and the remainder being Fe and unavoidable impurities, wherein the austenitic stainless steel has a work hardening rate of 1500 MPa or less within a true strain range of 0.15 to 0.4. Therefore, when a sink bowl and the like are processed using the austenitic stainless steel, the true strain and work hardening rate of which are controlled, the occurrence of delayed fracture in a molded corner thereof, which has been subjected to a large amount of processing, can be prevented.

公开(公告)号：US20170349985A1

公开(公告)日：2017-12-07

申请号：US15539874

申请日：2015-12-01

Applicant: POSCO

Inventor： Hyung Gu KANG ,  Gyu Jin JO ,  Dong Chul CHAE ,  Jae Hwa LEE

IPC: C22C38/42 ,  C22C38/02 ,  C22C38/04

CPC classification number: C22C38/42 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/46 ,  C21D2211/001 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/58 ,  C22C2202/00

Abstract: Austenitic stainless steels excellent in flexibility are provided. The austenitic stainless steel excellent in flexibility includes, by weight percent, 0.1 to 0.65% of Si, 1.0 to 3.0% of Mn, 6.5 to 10.0% of Ni, 16.5 to 18.5% of Cr, 6.0% or less of Cu (excluding 0), 0.13% or less of (C+N) (excluding 0), and the remainder including Fe and unavoidable impurities, wherein the work hardening formula H1 defined by the following formula is 300 or less. H1=−459+79.8Si−10.2Mn−8.16Ni+48.0Cr−13.2Cu+623(C+N).

公开(公告)号：US20170327916A1

公开(公告)日：2017-11-16

申请号：US15529737

申请日：2015-11-20

Applicant: POSCO

Inventor： Jae Hwa LEE ,  Gyu Jin JO ,  Dong Chul CHAE

IPC: C21D8/02 ,  C22C38/42 ,  C22C38/44

CPC classification number: C21D8/0205 ,  C21D1/32 ,  C21D6/002 ,  C21D6/02 ,  C21D8/02 ,  C21D8/0226 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/42 ,  C22C38/44

Abstract: A high-hardness martensitic stainless steel with excellent antibacterial property and a preparation method therefor are disclosed. The high-hardness martensitic stainless steel with excellent antibacterial property comprises: 0.45-0.65 wt % of C; 0.02-0.06 wt % of N; 0.1-0.6 wt % of Si; 0.3-1.0 wt % of Mn; 0.1-0.4 wt % of Ni; 13-14.5 wt % of Cr; 0.4-0.6 wt % of Mo; 0.8-1.2 wt % of W; 1.5-2.0 wt % of Cu; and the balance of Fe and inevitable impurities. According to the present disclosure, there is an advantage enabling the preparation of the martensitic stainless steel for knives, the martensitic stainless steel having high hardness, high corrosion resistance and excellent antibacterial property, by uniformly distributing fine chromium carbide and e-Cu precipitates in the microstructure of a batch annealed material of a high-carbon martensitic stainless steel containing Cu. In addition, there is an advantage of causing no rust formation on a material after an antibacterial evaluation.

公开(公告)号：US20150315686A1

公开(公告)日：2015-11-05

申请号：US14653944

申请日：2012-12-27

Applicant: POSCO

Inventor： Dong Chul CHAE ,  Gyu Jin JO ,  Jae Hwa LEE ,  Kwang Yuk KIM

IPC: C22C38/58 ,  C22C38/50 ,  C22C38/00 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C21D7/13 ,  C22C38/48

CPC classification number: C21D8/02 ,  C21D6/004 ,  C21D7/13 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/40 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: A hot-rolled stainless steel sheet having excellent hardness and low-temperature impact properties, in which a ferrite is formed with martensite as a matrix structure, is manufactured by a steel manufacturing process, a continuous casting process, and a hot-rolling process. The hot-rolled stainless steel sheet comprises C, N, Si, Mn, Cr, Ni, Ti, Nb, Mo, and the remainder being Fe and other inevitable impurities, wherein C is 0.01 to 0.03 wt %, Cr is 11 to 14 wt %, Ti is 0.1 to 0.2 wt %, and Nb is 0.1 to 0.2 wt %. The ferrite stability (FS) expressed by the following [formula 1] is 5 to 50, and a ferrite is formed with martensite as a matrix structure. [Formula 1] 4 FS=−215−619C−16.6Mn+23.7Cr−36.8Ni+42.2Mo+96.2Ti+67Nb−237N+17.2Si, wherein the numerical value of each component described in [Formula 1] denotes the content (wt %) of each component.

Abstract translation: 通过钢制造工艺，连续铸造工艺和热轧工艺制造具有优异的硬度和低温冲击性能的热轧不锈钢板，其中通过马氏体作为基体结构形成铁素体。 热轧不锈钢板包括C，N，Si，Mn，Cr，Ni，Ti，Nb，Mo，其余为Fe等不可避免的杂质，其中C为0.01〜0.03重量％，Cr为11〜14 wt％，Ti为0.1〜0.2重量％，Nb为0.1〜0.2重量％。 由以下[式1]表示的铁素体稳定性（FS）为5〜50，以马氏体为矩阵结构形成铁素体。 [式1] 4 FS = -215-619C-16.6Mn + 23.7Cr-36.8Ni + 42.2Mo + 96.2Ti + 67Nb-237N + 17.2Si，其中[式1]中记载的各成分的数值表示含量 （重量％）。