Title:
COLD ROLLED STEEL SHEET FOR PROCESSING WITH EXCELLENT HEAT RESISTANCE, AND PREPARATION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/068328
Kind Code:
A2
Abstract:
The present invention relates to a cold rolled steel sheet for processing with excellent heat resistance, and a preparation method thereof. The cold rolled steel sheet for processing comprises C:0.002~0.005%, Nb:0.02~0.06%, Co:0.02~0.20%, Mn:0.10~0.35%, Al:0.02~0.08%, P:0.003~0.020%, N:0.002~0.006%, S:less than or equal to 0.015%, the balance of Fe, and other inevitable impurities by weight%, or additionally comprises Sn:0.05~0.25% to the composition, and thus has excellent processability and heat resistance, or additionally has excellent discoloration resistance and the like. According to the present invention, it is possible to prepare a highly heat resistant cold rolled steel sheet for processing which can be prepared with a low cost compared with known stainless steel sheets, has excellent room temperature processability due to various processing characteristics such as stretch flange formability, bendability and deep drawing property, shows excellent formability since yield point elongation does not appear due to the increase of anti-aging property by precipitation of dissolved alloy elements, has excellent high temperature strength to be able to extend the lifetime of equipment due to the shape freezing property of products applied at a high temperature, and has excellent discoloration resistance at a high temperature.
Inventors:
KIM, Jai-Ik (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
김재익 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
KIM, Sung-Jin (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
김재익 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
KIM, Sung-Jin (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
Application Number:
KR2010/008376
Publication Date:
June 09, 2011
Filing Date:
November 25, 2010
Export Citation:
Assignee:
POSCO (#1 Goedong-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)
KIM, Jai-Ik (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
김재익 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
주식회사 포스코 (경상북도 포항시 남구 괴동동 1번지, 790-300 Gyeongsangbuk-do, 790-300, KR)
KIM, Jai-Ik (#1Goedong-dong, Nam-g, Pohang-si Gyeongsangbuk-do 790-300, 790-300, KR)
김재익 (경상북도 포항시 남구 괴동동 1번지 포스코내, 790-300 Gyeongsangbuk-do, 790-300, KR)
International Classes:
C22C38/00; B21B3/02; C21D8/02; C21D9/46; C22C38/10; C22C38/12
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)
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