| 摘要 |
PURPOSE: To provide an austenitic heat resistant steel for internal combustion engine exhaust gas cleaning system, excellent in heat resistance and improved in intergranular corrosion sensitivity as well as in high-temp. salt corrosion resistance. CONSTITUTION: This austenitic heat resistant steel for exhaust gas cleaning system has a composition consisting of <=0.06% C, >4-10% Si, <=2.0% Mn, 12-20% Ni, >16%-23% Cr, 0.001-0.1% of one or >=2 kinds among rare earth elements and Y, and the balance Fe with inevitable impurities at steelmaking, further containing, if necessary, 0.1-1.0% of Nb and/or Ti, and satisfying Nb/(C+N)>=8, Ti/(C+N)>=4, or (Ti+0.5Nb)/(C+N)>=4. |
