Valve Material Reference
ASTM A494 M35-1 Valve
Cast Monel M35-1 (Nickel-Copper Alloy)ASTM A494 Grade M35-1 is the cast nickel-copper alloy (Monel) used for valve bodies and pressure-retaining castings in hydrofluoric acid (HF), saltwater, and reducing acid applications.
Form
Cast
Max Temp
+482°C (+900°F)
Min Temp
−73°C (−100°F)
Category
Nickel Alloy
Chemical Composition — ASTM A494 M35-1
Temperature Range
−73°C to +482°C (−100°F to +900°F)
Maximum Temperature
+482°C (+900°F)
Minimum Temperature
−73°C (−100°F)
Equivalent Grades — ASTM A494 M35-1
| Standard | Equivalent Grade |
|---|---|
| ASTM | A494 M35-1 (cast) / B164 Monel 400 (wrought bar) |
| UNS | N04500 (approximate cast equivalent) |
| Tradename | Monel M35-1 (Huntington / Special Metals) |
Suitable Services
HF alkylation (STRATCO / Equistar process) — Monel M35-1 is mandatory for valve bodies, stems, and trim in contact with HF
Offshore seawater cooling — saltwater corrosion resistance, better than duplex in low-velocity seawater
Hydrochloric acid service — reducing acid below oxidising threshold
Sodium hydroxide (caustic) service — superior to stainless in hot concentrated caustic
Brine and salt processing — evaporators, crystallisers, valve isolation
Not Suitable For
Oxidising acids (nitric acid, hot concentrated H₂SO₄) — Hastelloy C-276 preferred
High-temperature above 482°C — mechanical strength falls; use Inconel 625 or 718
Aerated HF — can cause stress corrosion cracking; specific deaeration may be required
Valve Body Applications
HF alkylation unit valve bodies — hydrofluoric acid at all concentrations (key refinery material)
Seawater service valve bodies — offshore platforms, marine ballast, cooling water
Reducing acid valve bodies — sulfuric, hydrochloric (below aeration threshold)
Caustic (NaOH) service valve bodies — where chloride contamination is present
Trim Applications
Seat rings and plug trim for corrosion-resistant valve trim in HF service
Stems and packing glands in Monel ball and gate valves
Typical Valve Types in ASTM A494 M35-1
Ball valves
Gate valves
Globe valves
Check valves
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We supply ASTM A494 M35-1 (Cast Monel M35-1 (Nickel-Copper Alloy)) 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.