Valve Material Reference
ASTM A182 F53 / UNS S32750 (Super Duplex 2507) Valve
Super Duplex 2507Super Duplex 2507 (UNS S32750, ASTM A182 F53) is a high-alloy duplex stainless steel with exceptional resistance to pitting, crevice, and stress corrosion cracking in severely chloride-rich environments.
Form
Both
Max Temp
+300°C (+572°F)
Min Temp
−50°C (−58°F)
Category
Duplex
Chemical Composition — ASTM A182 F53 / UNS S32750 (Super Duplex 2507)
Temperature Range
−50°C to +300°C (−58°F to +572°F)
Maximum Temperature
+300°C (+572°F)
Minimum Temperature
−50°C (−58°F)
Equivalent Grades — ASTM A182 F53 / UNS S32750 (Super Duplex 2507)
| Standard | Equivalent Grade |
|---|---|
| UNS | S32750 |
| ASTM | A182 F53 (forged), A995 CD3MWCuN (cast) |
| EN | X2CrNiMoN25-7-4 / 1.4410 |
| ISO | ISO 15156-3 Annex A, Table A.3 |
Suitable Services
Seawater injection and produced water treatment (offshore)
Subsea control valve bodies and wellhead isolation
Desalination plant high-pressure piping valves
Hypochlorite generation and chlorinated seawater
Acetic acid and organic acid plants (resists SCC better than 316SS)
Not Suitable For
Service above 300°C — risk of sigma phase embrittlement
Strongly reducing acids (HCl at high concentration, HF)
Cryogenic service below −50°C
Valve Body Applications
Deep offshore and subsea valve bodies (tree valves, manifolds, HIPPS)
North Sea and Gulf of Mexico seawater injection valves
Produced water and brine handling valves
Chloride-rich chemical process valve bodies
Trim Applications
Ball valve balls — solid Super Duplex or hard Stellite overlay on 2507
Seats — solid 2507 or with PTFE insert
Stem — Super Duplex bar per ASTM A276
Typical Valve Types in ASTM A182 F53 / UNS S32750 (Super Duplex 2507)
Ball valves: offshore seawater, Class 600–2500
Gate valves: subsea isolation, Class 600–1500
Butterfly valves: large-bore seawater handling, DN200–DN1000
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Technical Reference
Valve Engineering · 12 min read
Subsea and Offshore Valve Design: Requirements, Standards, and Selection
Subsea valves operate in one of the most demanding environments in engineering — extreme hydrostatic pressure, total inaccessibility for maintenance, corrosive seawater, and the consequences of any failure measured in catastrophic oil spills or production losses of millions of dollars per day. This guide covers the design standards, testing requirements, and material specifications that define subsea and offshore topsides valve engineering.
All Valve Materials
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