Sheathed mid-section of a catalyst housing

A jacket-shaped middle part (1) of a catalytic converter housing, in particular for exhaust systems for internal combustion motors, which jacket-shaped middle part (1), incorporating an intermediate layer (4) made of an equalising material, encloses a monolith (3) which comprises a catalytically effective material under initial radial tension, wherein the marginal regions (5, 6) of the sheet metal plate, which has been formed to constitute the jacket-shaped middle part (1), mutually overlap and are firmly interconnected,

• characterised in that
• the sheet metal thickness in the marginal areas (5, 6) of the middle part (1) in the area of overlap is reduced to such an extent in relation to the remaining metal plate, and in that the marginal regions of the jacket-shaped middle part (1) are mutually and vertically offset in relation to the outside (1a) of the sheet metal plate, that the outsides or insides of the marginal regions (5, 6) and of the adjoining regions of the middle part (1) without reduction in sheet metal thickness are in the same respective jacket plane.