ASTM A890 Grade 4A Globe control valve
ASTM A890 Grade 4A (often designated as CD3MN) is a standard specification for cast duplex (austenitic/ferritic) stainless steel. It offers superior mechanical strength and excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. It is widely utilized in severe service environments like marine, chemical processing, and desalination systems
Key Specifications & Properties
- Material Equivalents: Cast equivalent to wrought duplex 2205 (UNS S31803 / S32205).
- UNS Number: J92205.
- Metallurgical Structure: Balanced, two-phase mixture of roughly 50% austenite and 50% ferrite
KOMOTO AO-3607 Control valve maintenance services
