Valve Material Reference
ASTM B443 / UNS N06625 (Inconel 625) Valve
Inconel 625 / Alloy 625Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy with outstanding corrosion resistance across a wide range of aggressive environments — seawater, oxidising and reducing acids, chloride solutions, and high-temperature oxidising gases.
Form
Both
Max Temp
+980°C (+1800°F)
Min Temp
−196°C (−321°F)
Category
Nickel Alloy
Chemical Composition — ASTM B443 / UNS N06625 (Inconel 625)
Temperature Range
−196°C to +980°C (−321°F to +1800°F)
Maximum Temperature
+980°C (+1800°F)
Minimum Temperature
−196°C (−321°F)
Equivalent Grades — ASTM B443 / UNS N06625 (Inconel 625)
| Standard | Equivalent Grade |
|---|---|
| UNS | N06625 |
| ASTM | B443 (plate), B446 (bar), B564 (forged fittings) |
| EN | NiCr22Mo9Nb / 2.4856 |
Suitable Services
Seawater and subsea service (HP/HT wells, HPHT risers)
Chloride-rich process streams and acid chloride mixtures
Acid gas (CO₂ + H₂S) injection wells
Flue gas desulphurisation (FGD) — wet scrubber environment
Nuclear primary coolant and waste handling systems
Aerospace and defence high-temperature systems
Not Suitable For
Concentrated hydrofluoric acid (HF) — use Monel 400
Strongly reducing mineral acids at high concentration
Valve Body Applications
Subsea chemical injection valves and manifolds
Offshore riser isolation valves
Acid gas injection valves (CO₂ + H₂S)
High-concentration acid service valves (nitric, phosphoric)
Trim Applications
Ball valve balls and seats — overlaid or solid Inconel 625
Globe valve stem and disc — Alloy 625 bar stock
Gate valve wedge hard-facing — Inconel 625 weld overlay
Typical Valve Types in ASTM B443 / UNS N06625 (Inconel 625)
Ball valves: subsea chemical injection, Class 600–2500
Globe valves: acid service, instrumentation
Gate valves: offshore HP/HT isolation service
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Technical Reference
Industry Applications · 10 min read
How to Specify Industrial Valves for Chemical Service: A Complete Guide
Chemical plants handle some of the most aggressive fluids in any industry — strong acids, chlorinated solvents, caustic solutions, oxidising agents, and toxic gases. Specifying the wrong valve body material, seat, or seal material can lead to catastrophic corrosion, product contamination, or unsafe failure. This guide covers every variable in chemical valve specification.
All Valve Materials
Need ASTM B443 / UNS N06625 (Inconel 625) Valves?
We supply ASTM B443 / UNS N06625 (Inconel 625) (Inconel 625 / Alloy 625) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.