Grade 4A castings must be :
: Combines high toughness with mechanical integrity, ensuring reliable performance in moderately aggressive service conditions. Common Applications astm a995 gr4a
is the standard specification for cast, austenitic-ferritic (duplex) stainless steel castings intended for pressure-containing and corrosion-resistant applications. Grade 4A castings must be : : Combines
Due to its high strength and work-hardening rate, Gr4A is more difficult to machine than 316 stainless steel. Use: astm a995 gr4a
To understand Gr4A, one must first understand the umbrella specification. ASTM A995 (originally A890) covers duplex stainless steel castings for pressure-containing parts such as valves, pumps, flanges, and fittings. The “4A” designation refers to a specific duplex microstructure—approximately 40-50% ferrite and 50-60% austenite.
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