Monel 400 (UNS N04400): Seawater-Resistant Nickel-Copper Alloy
ASTM B127 · Published: 2026-06-03 · Updated: July 2026
Monel 400 (67% Ni, 30% Cu) is a nickel-copper alloy with exceptional resistance to seawater, hydrofluoric acid, and caustic alkalis. It is the standard material for marine pump shafts, propeller shafts, seawater valve trim, and HF acid alkylation...
Monel 400 (67% Ni, 30% Cu) ist ein nickel-copper alloy mit exceptional widerstand zu seawater, hydrofluoric acid, und caustic alkalis. Es ist der standard material für marine pumpe shafts, propeller shafts, seawater ventil trim, und HF acid alkylation units in petroleum refineries. Unlike stainless steels, Monel 400 ist immune zu chloride stress corrosion cracking.
Quick Facts
| Kategorie | Nickel Alloy |
| Norm | ASTM B127 |
| Density | 8.80 g/cm³ |
| Yield Strength | 195 MPa |
| Tensile Strength | 517 MPa |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN 2.4360 | Compare |
| NiCu30Fe | Compare |
| JIS NW4400 | Compare |
| GB NCu30 | Compare |
Verwandt Materials
🧮 Material Weight Calculator
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Frequently Asked Questions
Warum ist Monel 400 preferred über 316 stainless für marine shafts?
Monel 400 ist immune zu pitting und crevice corrosion in stagnant seawater — 316 ist nicht. Additionally, Monel's galling widerstand prevents seizing von schließen-fitting shaft components, welche ist kritisch für marine propeller shafts das kann sit leerlauf für months.
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu