Fatigue tests on welded joints in both austenitic and duplex stainless steels have shown that, in the absence of corrosion and other environmental effects, the behaviour is similar to that for ferritic steel joints. Thus allowable cyclic stresses for structural steel joints, e.g. in the UK, those given in BS7608, can also be applied to stainless steels (although this is not explicitly stated in the standard). Similar fatigue rules are given in Annex C of the UK pressure vessel code PD5500: 2000 'Specification for unfired fusion welded pressure vessels' which may be used for ferritic steels up to 350°C and austenitic stainless steels up to 430°C.