Title:
AUSTENITIC STAINLESS STEEL WITH IMPROVED CREEP-RESISTANT PROPERTIES AND TENSILE STRENGTH AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/111251
Kind Code:
A1
Abstract:
Disclosed are austenitic stainless steel with improved creep-resistant properties and tensile strength and a method for producing the same. The austenitic stainless steel with improved creep-resistant properties and tensile strength according to an embodiment of the present invention includes, by weight%, 0.1% or less (excluding 0) of carbon (C), 1.0% or less (excluding 0) of silicon (Si), 2.0% or less (excluding 0) of manganese (Mn), 18 to 24% of chromium (Cr), 9 to 12% of nickel (Ni), 0.05 to 0.5% of niobium (Nb), 0.1 to 0.25% of nitrogen (N), 0.001 to 0.005% of boron (B), the remainder being iron (Fe) and other unavoidable impurities, wherein the number of carbonitrides is 10/100 ㎛2 or more. Therefore, the composition of the austenitic stainless steel is controlled to refine the grains thereof, which improves the tensile strength and creep-resistant properties at high temperature, thereby reducing the production cost.
Inventors:
KIM KWANG MIN (KR)
KIM JONG HEE (KR)
JO KI HOON (KR)
SEO BO SUNG (KR)
KIM JONG HEE (KR)
JO KI HOON (KR)
SEO BO SUNG (KR)
Application Number:
PCT/KR2016/008883
Publication Date:
June 29, 2017
Filing Date:
August 12, 2016
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/58; C21D6/00; C22C38/00; C22C38/02; C22C38/04; C22C38/48; C22C38/50; C22C38/54
Foreign References:
| KR101393784B1 | 2014-05-12 | |||
| JP2012255198A | 2012-12-27 | |||
| JPS62243743A | 1987-10-24 | |||
| JPS61238913A | 1986-10-24 | |||
| KR101543938B1 | 2015-08-11 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
Download PDF: