Valve Material Reference
ASTM B164 / UNS N04400 (Monel 400) Valve
Monel 400Monel 400 (UNS N04400) is a nickel-copper alloy with exceptional resistance to hydrofluoric acid (HF), fluorine, seawater, and reducing environments.
Form
Both
Max Temp
+480°C (+900°F)
Min Temp
−196°C (−321°F)
Category
Nickel Alloy
What is ASTM B164 / UNS N04400 (Monel 400)?
ASTM B164 / UNS N04400 (Monel 400) (Monel 400) is a nickel alloy valve material. Monel 400 (UNS N04400) is a nickel-copper alloy with exceptional resistance to hydrofluoric acid (HF), fluorine, seawater, and reducing environments. Temperature range: −196°C to +480°C (−321°F to +900°F).
- Form:
- both
- Max Temp:
- +480°C (+900°F)
- Min Temp:
- −196°C (−321°F)
Chemical Composition - ASTM B164 / UNS N04400 (Monel 400)
Temperature Range
−196°C to +480°C (−321°F to +900°F)
Maximum Temperature
+480°C (+900°F)
Minimum Temperature
−196°C (−321°F)
Vajra Industrial Solutions manufactures and supplies valves in ASTM B164 / UNS N04400 (Monel 400) (Monel 400) for hydrofluoric acid (hf) alkylation units in oil refineries, with EN 10204 3.1 material traceability on every order.
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Equivalent Grades - ASTM B164 / UNS N04400 (Monel 400)
| Standard | Equivalent Grade |
|---|---|
| UNS | N04400 |
| ASTM | B164 (bar), B127 (plate), B564 (forged) |
| EN | NiCu30Fe / 2.4360 |
Suitable Services
Hydrofluoric acid (HF) alkylation units in oil refineries
Seawater injection, produced water treatment, ballast water
Chlorine gas service at low concentrations
Caustic soda manufacturing and concentration
Hydrogen sulphide (H₂S) and salt solutions
Marine hardware and offshore pipeline valves
Not Suitable For
Concentrated HNO₃ (nitric acid) - severe corrosion
Concentrated H₂SO₄ (sulphuric acid) above 80% concentration
Oxidising salts at elevated temperature
Valve Body Applications
HF alkylation unit valves (entire valve wetted path in Monel 400)
Seawater injection valve bodies for offshore platforms
Caustic soda (NaOH) concentration plant valves
Fluorocarbon and fluorine gas handling valves
Trim Applications
Ball valve balls - solid Monel 400 or Monel overlay
Gate and globe valve seats - Monel 400 bar
Stem - Monel K500 (age-hardened variant) for higher strength
Typical Valve Types in ASTM B164 / UNS N04400 (Monel 400)
Ball valves: HF alkylation service, Class 150–600
Gate valves: seawater injection, Class 150–600
Globe valves: caustic service, control 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.
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Connected Engineering
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We supply ASTM B164 / UNS N04400 (Monel 400) (Monel 400) valves with full certification documentation — EN 10204 3.1/3.2 MTCs and hydrotest certs as standard.