Boa Balg-und Kompensatoren-technologie Gmbh

Klaus Hirth

Immo Gärtner

Jürgen Telatinski

Uwe Wild

A process for manufacturing a bellows, made of austenitic high-grade steel with high compressive strength and fatigue strength, forms a single-layer or multilayer sleeve into a bellows with hydraulic forming. The pressure resistance and fatigue strength are improved by the bellows being cleaned after the forming and by the bellows being exposed to a surrounding area containing carbon and/or nitrogen atoms at temperatures between 100&#xb0; C. and 400&#xb0; C., preferably 200&#xb0; C. to 320&#xb0; C. With this a hardening of the bellows takes place by means of the diffusing in of carbon and/or nitrogen atoms. A bellows made of austenitic high-grade steel with one or more layers created in this manner has the edge layer hardened by the incorporation of carbon and/or nitrogen atoms up to a hardening depth of at least 5% of the wall thickness.

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Malsch, Germany

Klaus Hirth