Patent ID: 7788912

Claim:
An exhaust treatment device for an exhaust system of an internal combustion engine, comprising: a housing having at least two housing sections, at least one of which includes a ferritic material and at least one other of which includes an austenitic material; at least one exhaust treatment insert arranged in the housing; and, means for connecting the at least one ferritic housing section to the at least one austenitic housing section, wherein the connection is composed of a duplex material with a ferritic phase and an austenitic phase, wherein, the connection has a single value of coefficient of thermal expansion from a first end where the connection connects to the at least one ferritic housing section to a second end where the connection connects to the at least one austenitic housing section, and wherein the coefficient of thermal expansion of the connection lies between the coefficients of thermal expansion of the ferritic material and the austenitic material.