Patent ID: 8206091

Claim:
An exhaust guide member of a nozzle vane-type turbocharger equipped with at least a nozzle vane and drive ring for changing the speed of exhaust gas running through a turbine in accordance with the speed of engine revolution, wherein the member to constitute the nozzle vane and the drive ring and to constitute an exhaust guide for guiding exhaust gas to the turbine is formed of an austenite stainless steel consisting of, in terms of % by mass, at most 0.08% of C, from 2.0 to 4.0% of Si, at most 2.0% of Mn, from 8.0 to 16.0% of Ni, from 18.0 to 20.0% of Cr and at most 0.04% of N and containing these ingredients in such a manner that they satisfy a DE value of the following formula to be from 5.0 to 12.0, with a balance of Fe and inevitable impurities: DE value=Cr+1.5Si+0.5Nb+Mo—Ni−0.3Cu−0.5Mn−30(C+N).