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.