N08904 (904L) vs 316L vs 2205: Choosing der Rechts Corrosion-Resistant Alloy
N/A - Selection Guide · Published: 2026-06-02 · Updated: July 2026
This is a selection guide, not a single material specification. When choosing between stainless steels for severe corrosive environments, the primary decision metric is PREN (Pitting Resistance Equivalent Number = %Cr + 3.3×%Mo + 16×%N). 304:...
Dies ist ein selection leitfaden, nicht ein single material specification. Wenn choosing zwischen stainless steels für severe corrosive environments, der primär decision metric ist PREN (Pitting Widerstand Entsprechung Number = %Cr + 3.3×%Mo + 16×%N). 304: PREN 18-20 (atmospheric, freshwater). 316L: PREN 24-28 (coastal, mild chemical). 904L: PREN 34-38 (sulfuric acid, severe chemical). 2205 Duplex: PREN 34-38 (seawater, hoch strength needed). 254 SMO (6% Mo): PREN 42-44 (seawater heat exchangers, bleach plants). AL-6XN: PREN 45-48 (offshore, FGD scrubbers). Inconel 625: PREN >50 (ultimate seawater/chemical). Immer verify mit corrosion testing unter actual service conditions rather als relying solely ein calculated PREN values.
Quick Facts
| Kategorie | Edelstahl |
| Norm | N/A - Selection Guide |
| Density | 8.00 g/cm³ |
| Yield Strength | N/A - selection guide |
| Tensile Strength | N/A - selection guide |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Was PREN ist sufficient für seawater service?
Für ambient-temperature seawater mit cathodic protection: PREN ≥32 (2205 duplex minimum). Für warm seawater (>30°C) ohne cathodic protection: PREN ≥40 (super duplex 2507 oder 6% Mo super austenitic). Für seawater-chlorinated systems (hypochlorite generation): PREN ≥40 plus sufficient nickel für widerstand zu active corrosion. Der European standard NORSOK M-001 provides detailed material selection guidance für offshore seawater systems.
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