321 Stainless Steel Fatigue Resistance

1. What is 321's fatigue strength? Approximately 200 MPa at 10^7 cycles (room temperature).

2. Does temperature affect 321's fatigue resistance? Strength decreases above 500°C but remains stable for cyclic service.

3. Can 321 withstand thermal cycling fatigue? Yes, it resists crack formation from repeated heating/cooling.

4. Is 321 suitable for high-stress rotating components? Yes, for moderate-speed shafts and turbine parts.

5. How to improve 321's fatigue resistance? Polishing surfaces to remove defects and reduce stress concentrations.