Ferritic stainless steel for exhaust gas passage member

摘要

This invention is in mass % C: less than 0.03%, Si: less than 1%, Mn: 1.5% or less , Ni: 0.6% or less , Cr: 10 to 20%, Nb: 0.5 to greater than 0.7%, Ti: 0.05 to 0.3%, Cu: 1 to greater than 2%, V: 0.2 or less, N: less than 0.03%, B : 0.0005 to 0.02% , and , if necessary Al: 0.1% or less , or yet Mo, W, Zr, containing at least one of Co in the range of 4% or less in total , and the balance Fe and inevitable impurities is made of a , both on the field diameter 0.5 than Cu and Nb compound phase 10 / 25 ² is stainless steel for automobile exhaust gas path member having less tissue . This stainless steel represents excellent thermal fatigue characteristics also apply to the maximum temperature is higher exhaust gas path to the absence of any type and low type , and also has excellent low-temperature toughness .