Title:
金属間化合物の形成が抑制された耐食性、耐脆化性、鋳造性及び熱間加工性に優れたスーパー二相ステンレス鋼
Document Type and Number:
Japanese Patent JP4834292
Kind Code:
B2
Abstract:
Formation of intermetallic phases such as sigma (Ã) and khi (Ç) shows detrimental effects on the corrosion and mechanical properties of high-grade duplex stainless steel. The present invention provides high-grade duplex stainless steel with much suppressed formation of intermetallic phases, of which the chemical composition consists essentially, on a weight basis, of: Cr: 21.0% - 38.0%, Ni: 3.o% - 12.0%, Mo: 1.5% - 6.5%, W: 6.5% or less, Si: 3.0% or less, Mn: 8.0% or less, N: 0.2% - 0.7%, C: 0. 1% or less, at least one element selected from the group consisting of Ba: 0.0001 - 0.6% and one or more elements of Mischmetal (MM) and Y: 0.0001 - 1.0% in total, and a balance of Fe and incidental impurities. The pitting resistance equivalent has a value of 40 ‰ PREW ‰ 67 defined by the following formula (1): PREW = wt.%Cr + 3.3(wt.%Mo + 0.5wt.%W) + 30wt.% N-----(1) The present high-grade duplex stainless steel exhibits an excellent corrosion resistance, embrittlement resistance, castability and hot workability.
Inventors:
PARK,Yong-Soo
Kim, Sun-te
Lee, In-Sun
Kim, Sun-te
Lee, In-Sun
Application Number:
JP2003578609A
Publication Date:
December 14, 2011
Filing Date:
March 24, 2003
Export Citation:
Assignee:
PARK,Yong-Soo
International Classes:
C22C38/00; C22C38/42; C22C38/44; C22C38/58
Domestic Patent References:
| JPH06116684A | 1994-04-26 | |||
| JPH07278755A | 1995-10-24 | |||
| JPH0593246A | 1993-04-16 | |||
| JPH05132741A | 1993-05-28 | |||
| JPH08218154A | 1996-08-27 |
Attorney, Agent or Firm:
Hajime Tsukuni
Fusayuki Saito
Fusayuki Saito