Title:
AUSTENITIC STAINLESS STEEL FOR SODA RECOVERING BOILER HEAT TRANSFER PIPE
Document Type and Number:
Japanese Patent JPH06179952
Kind Code:
A
Abstract:
PURPOSE: To provide austenitic stainless steel for a superheater pipe excellent in high temp. corrosion resistance and high temp. strength.
CONSTITUTION: This steel is one contg., by weight, <0.03% C, ≤0.5% Si, >2 to 6% Mn, ≤0.03% P, ≤0.01% S, >26 to 30% Cr, >18 to <25% Ni, 0.5 to <1.5% Mo, >0.3 to 0.6% Nb and 0.2 to 0.4% N, and the balance Fe with inevitable impurities, furthermore constituted of fine grains of ≥7 grain size number (JIS) and satisfying the following inequality: 206×(%) P+400×(%)S+4×(%) Nb-0.4×(JIS grain size number)≤5.8. Then, this steel is incorporated with 0.002 to 0.02% Mg and/or Ca and 0.02 to 0.2% Al according to demand.
Inventors:
OTSUKA NOBUO
TOKURA SHIGERU
SAWARAGI YOSHIATSU
TOKURA SHIGERU
SAWARAGI YOSHIATSU
Application Number:
JP35369492A
Publication Date:
June 28, 1994
Filing Date:
December 15, 1992
Export Citation:
Assignee:
SUMITOMO METAL IND
International Classes:
C22C30/00; C22C38/00; C22C38/48; F22B37/04; (IPC1-7): C22C38/00; C22C30/00; C22C38/48; F22B37/04
Attorney, Agent or Firm:
Koichiro Izawa