Abstract
In order to develop a new hydraulic runner casting with a good corrosion resistance, studies have been carried out on some properties of several Cr-Ni martensitic stainless cast steels. The properties of a partial model runner casting of the developed 17Cr-5Ni-1Mo steel were investigated. The results are as follows.
1. Internal quality of this casting is superior and comparable with that of 13Cr-Ni type casting in terms of cavity and macrosegregation.
2. Excellent corrosion resistance is performed by higher chromium content and 1% molybdenum addition.
3. Charpy impact properties are almost same as those of 13Cr-1Ni casting. This is attributed to delta ferrite.
4. Enhanced fatigue strength stems from higher corrosion resistance and tensile strength.
5. This casting also possesses good weldability.
