Looking to understand Fatigue calculations for stainless steel seamless tubing Problem: Material: 304 Stainless Steel tubing (.375 OD, .072 wall) per ASTM specifications used at 158F degrees maximum Ambient UTS 515 MPa, YTS 205 MPA, temperature de-rated per MIL-HDBK-5J to UTS 473.8 MPa, YTS 192.7 MPa. Burst Pressure: 710 bar Proof Pressure: 568 bar Operating Pressure: 420 bar Looking to find the fatigue life of this tubing when cycled from ambient to 420 bar at max temperature of 158F. Looking to generate a chart reflecting the stress-life and just understanding the fatigue of this application. Attached are my current fatigue calculations. I will be setting up practical tests to verify this application, however I'm looking to predict that this tubing will have a acceptable safety factor. Any help that is offered is greatly appreciated.