Valve Material Reference
ASTM A890 Grade 5A Valve
Super Duplex 2507 (Grade 5A Cast)ASTM A890 Grade 5A is the cast form of Super Duplex 2507 stainless steel (UNS S32750) - a super duplex grade with 25% Cr, 7% Ni, 4% Mo, and 0.
Form
Cast
Max Temp
+300°C (+572°F)
Min Temp
−46°C (−50°F)
Category
Duplex
What is ASTM A890 Grade 5A?
ASTM A890 Grade 5A (Super Duplex 2507 (Grade 5A Cast)) is a duplex valve material. ASTM A890 Grade 5A is the cast form of Super Duplex 2507 stainless steel (UNS S32750) - a super duplex grade with 25% Cr, 7% Ni, 4% Mo, and 0.28% N that offers the highest corrosion resistance of any commercial duplex grade. Temperature range: −46°C to +300°C (−50°F to +572°F) - limited to +300°C to prevent embrittlement.
- Form:
- cast
- Max Temp:
- +300°C (+572°F)
- Min Temp:
- −46°C (−50°F)
Chemical Composition - ASTM A890 Grade 5A
Temperature Range
−46°C to +300°C (−50°F to +572°F) - limited to +300°C to prevent embrittlement
Maximum Temperature
+300°C (+572°F)
Minimum Temperature
−46°C (−50°F)
Vajra Industrial Solutions manufactures and supplies valves in ASTM A890 Grade 5A (Super Duplex 2507 (Grade 5A Cast)) for deepwater subsea valves - seawater injection and well-testing at high chloride, high pressure, with EN 10204 3.1 material traceability on every order.
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Equivalent Grades - ASTM A890 Grade 5A
| Standard | Equivalent Grade |
|---|---|
| ASTM | A890 5A (cast) / A182 F53 (forged) |
| UNS | S32750 (wrought) / J93404 (cast) |
| EN | 1.4410 (X2CrNiMoN25-7-4) |
| Trade names | SAF 2507, Ferralium 255 |
Suitable Services
Deepwater subsea valves - seawater injection and well-testing at high chloride, high pressure
Offshore produced water re-injection (PWRI) valves - H₂S + CO₂ + chloride environments
FGD (flue gas desulphurisation) slurry recirculation valves - high-Cl sulfate solution
Pulp bleaching plant valves - chlorine dioxide, high chloride, oxidising conditions
Not Suitable For
High-temperature service above +300°C - 475°C embrittlement phase occurs
Strongly reducing mineral acid service - Hastelloy C-276 preferred for HCl, HF
Very low temperature below −46°C - austenitic or nickel alloy preferred
Valve Body Applications
Subsea Christmas tree (X-mas tree) valve bodies - deepwater injection service
High-chloride brine valve bodies - seawater injection, produced water re-injection (PWRI)
FGD (flue gas desulphurisation) valve bodies - wet scrubbing, CaSO₄ slurry
Offshore chemical injection pump discharge valves - highest corrosion resistance
Trim Applications
Seat rings and trim for offshore seawater and subsea ball valves
Stems and packing glands for high-chloride offshore service
Typical Valve Types in ASTM A890 Grade 5A
Ball valves
Gate valves
Globe valves
Butterfly valves
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We supply ASTM A890 Grade 5A (Super Duplex 2507 (Grade 5A Cast)) valves with full certification documentation — EN 10204 3.1/3.2 MTCs and hydrotest certs as standard.