Converter case and manufacturing method thereof

摘要

A converter case with prominent reliance/endurance in spite of a smaller number of parts and inexpensiveness. Contents (3) and (4) of a catalyst carrier etc. are received in a multistage state within a converter case (2), which has openings (7) and (8) at both ends of a metallic pipe (6). The converter case (2) is formed of accommodating pipe portions (11) and (12) and a connecting pipe portion (13). The accommodating pipe portions (11) and (12) allow for accommodating the contents (3) and (4). The connecting pipe portion (13) connects the accommodating pipe portions (11) and (12) to one another. A radially reduced part (14) is integrally formed on the connecting pipe portion (13).