Each material Hardness is determined. When you PWHT it The effect on hardness and the hardness depends on the cooling rate.
When you PWHT it, you must check the hardness to make sure it is in the correct.
How calculate corrosion allowance of HYDRAULIC TURBINE.
The information I have
1. Material is EN-JS1030 (QT400-15)Spheroidal graphite cast iron
2. Fluid is water (Chloride=220 ppm)
Thank You