What are the commonly used materials for cast steel flange valve?
1. Gray cast iron: Gray cast iron is suitable for water, steam, air, gas, oil and other media with a nominal pressure of PN≤1.0MPa and a temperature of -10℃～200℃. The commonly used grades of gray cast iron are: HT200, HT250, HT300, HT350.
2. Malleable cast iron: suitable for water, steam, air and oil media with a nominal pressure of PN≤2.5MPa and a temperature of -30～300℃. Commonly used grades are: KTH300-06, KTH330-08, KTH350-10.
3. Ductile ironcast steel flange valve: suitable for water, steam, air, oil and other media with PN≤4.0MPa and temperature of -30～350℃. Commonly used grades are: QT400-15, QT450-10, QT500-7.
