Corrosion Fatigue Behavior of High Strength Stainless Steel Manufactured by Three Different Melting Processes.

Abstract

The corrosion fatigue tests in city water were carried out on precipitation hardening stainless steel, SUS630, variously heat treated (H1075, H1025, and H900), which was manufactured by three different melting processes (air, double and triple melting process). The results obtained are as follows.The corrosion fatigue strength of all H1075 specimens manufactured by three melting processes decreased compared with fatigue strength in air. The triple melted H1075 specimen showed the highest value of corrosion fatigue strength, followed by the double melted and air melted specimens in the descending order. This result seemed to be connected with the maximum size of inclusions in the specimens.As for the triple melted specimens subjected to different heat treatments, the H1025 specimen showed the highest value of corrosion fatigue strength and the H900 and H1075 specimens were about the same.