How bad is stainless steel fatigue?

[DasKleineWunder]

Is there a distinct (and high) fatigue limit for stainless steel?
In other words Is there a fatigue limit force below which even millions of cycles wouldn't cause failure. Pretty much like Steel compared to Aluminum

Is there a big difference between Austenitic, Ferritic alloys?

 

[metengr]

Start here and use the resource below. It is free for some information. Google the rest, there is plenty to review on your own;

http://www.keytometals.com/page.aspx?ID=CheckArticle&site=KTS&NM=282

 

[EdStainless]

There are many high strength stainless grades that are used in severe fatigue environments.
Like steels, if you stay below a critical stress level you will have infinite fatigue life.
Alloy 21-6-9 (in the cold worked state) is used in aircraft hydraulic systems. At test stress levels of 30% of UTS the fatigue life exceeds 400,000 cycles. In service at 20% of UTS it will last forever.
13-8PH is also commonly used in high stress fatigue applications. There is a lot of data on this alloy.

Ferritic alloys will have very low fatigue limits because they have low strength.

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Plymouth Tube

 

[tbuelna]

It can be difficult to find reliable fatigue data on metals, since predicted fatigue life can be hugely affected by many factors with the material such as material cleanliness, grain structure, heat treatment, processing, corrosion or damage in service, etc.

In regards to your specific question about a "distinct (and high) fatigue limit for stainless steel", you'll need to define what "distinct" and "high fatigue limit" implies.