The Stress-Rupture Strength of Type 347 Stainless Steel Under Cyclic Temperature

Stress-rupture tests of Type 347 stainless steel were conducted in liquid sodium under constant and cyclic temperature conditions. Constant-temperature tests were conducted at temperatures between 1000 and 1200 deg F. Cyclic-test temperatures ranged from 416 to 1294 deg F, and cycle times ranged from 6 to 12 hr. It was concluded that the deviation of the test results from the rupture life calculated by the method of Robinson and Miller was due to transient creep of the steel under cyclic-temperature changes.