Title:
MARTENSITIC STAINLESS STEEL PRODUCED BY A TWIN ROLL STRIP CASTING PROCESS AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2011/081331
Kind Code:
A2
Abstract:
The present invention relates to a martensitic stainless steel produced by a twin roll strip casting process and a method for manufacturing the same. The key technical features of the present invention are for a martensitic stainless hot rolled steel sheet having superior crack resistance, manufactured by a twin roll strip casting process, and a method for manufacturing the same, wherein the martensitic stainless hot rolled steel sheet comprises, by weight%, C:0.1 to 1.5%, Cr:12 to 15%, Ni:1% or lower, Ti:0.005 to 0.1%, and the balance Fe and unavoidably added impurities, and wherein a primary chrome carbide precipitated at a grain boundary is fragmented and refined. The key technical features of the present invention are also for a high hardness martensitic stainless cold rolled steel sheet manufactured by annealing and cold rolling the hot rolled steel sheet, and a method for manufacturing the same. According to the present invention, a twin roll strip casting process is applied, and grain boundary strengthening elements are added to prevent center segregation, crack and strip breakage during casting, thereby ensuring the stability of the casting process. In addition, a refined and uniform structure is formed in a steel, and high hardness knives or tools having edges with high quality can be manufactured from the steel.
Inventors:
JEONG, Seong-In (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
정성인 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Yun-Yong (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이윤용 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Il-Goo (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이일구 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
정성인 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Yun-Yong (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이윤용 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Il-Goo (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이일구 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
Application Number:
KR2010/009004
Publication Date:
July 07, 2011
Filing Date:
December 16, 2010
Export Citation:
Assignee:
POSCO (#1Goedong-dong, Nam-guPohang-si, Gyeongsangbuk-do 790-300, 790-300, KR)
주식회사 포스코 (경상북도 포항시 남구 괴동동 1번지, 790-300 Gyeongsangbuk-do, 790-300, KR)
JEONG, Seong-In (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
정성인 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Yun-Yong (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이윤용 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Il-Goo (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
주식회사 포스코 (경상북도 포항시 남구 괴동동 1번지, 790-300 Gyeongsangbuk-do, 790-300, KR)
JEONG, Seong-In (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
정성인 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Yun-Yong (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
이윤용 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
LEE, Il-Goo (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
International Classes:
C22C38/18; B21B1/46; B22D11/06; C21D8/00
Attorney, Agent or Firm:
HONG, Sung-Chul (Rm. 204, Ace High-End Tower-3371-50, Gasan-dong, Gumchun-ku, Seoul 153-803, 153-803, KR)