The Autofrettage is an important procedure for components which are exposed to high and ultra high pressures. Depending on geometry and strength of material, different degrees of wall thickness permanent deformation are calculated. Introduction of residual stresses into the wall of high pressure components by permanent deformation is essential for reduction of operating stresses and leads to essential extension of life time. Especially for components in waterjet cutting units like cylinder, check valve and cutting valve parts, the Autofrettage is mandatory. On behalf of diagrams the determination of the optimum Autofrettage pressure is illustrated. For Autofrettage treatment pressure ratings between 600 Mpa and 1,000 Mpa are applied. The advantages of Autofrettage procedure are illustrated on stress versus wall thickness diagrams and verified by fatigue testing under cyclic pressure load conditions.
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