"I am looking for the endurance limit for stainless steel 440c at hrc 58/62. The only I can find id that T.S.(after heat treated) is 270 ksi and Y.S (after heat treated) is 280 ksi. The fatigue strength for my design is very important."
If you believe in such a thing as "endurance limit", you can refer to Mechanical Engineering Design by Shigley & Mischke. For steels with UTS greater than 200 ksi, the endurance limit is listed as 100 ksi. Refer to Section 7-6 in Shigley for more information and data. As for myself, I do not believe in the concept of "endurance limit". It's too easy to make a material fail in fatigue below what is called an endurance limit by simply applying an occasional overload such as may be produced by an earthquake or hurricane loading on a structure.
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