ASTM B535 NiFeCrSi Alloy Seamless Pipe
ASTM B535 is the standard specification for "Seamless Tube of Nickel-Iron-Chromium-Silicon Alloys".
This standard covers seamless tubes and pipes intended for heat-resisting and general corrosive service, made from a specific family of nickel-iron-chromium-silicon alloys. The most common alloys under this specification are UNS N08330 and UNS N08332.
The standard defines the requirements for chemical composition, mechanical properties, dimensions, and testing for these seamless pipes.
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UNS N08330 and UNS N08332
These alloys are renowned for their excellent resistance to oxidation, carburization, and thermal cycling at high temperatures.
Common Names:
UNS N08330: Commonly known as Alloy 330 (Werkstoff Nr. 1.4886).
UNS N08332: A variant with improved resistance to carburization and sulfidation, often called Alloy 332 or RA 330.
Characteristics and Composition
| Feature | UNS N08330 (Alloy 330) | UNS N08332 (Alloy 332) |
|---|---|---|
| Common Name | Alloy 330, 1.4886 | Alloy 332, RA 330 |
| Key Composition | 35% Ni, 19% Cr, 45% Fe, 1.0-1.5% Si | 35% Ni, 19% Cr, 45% Fe, 1.8-2.5% Si |
| Key Characteristics | Excellent strength and resistance to oxidation, carburization, and thermal cycling. Good resistance to chlorine attack. | Enhanced version with higher Silicon, providing superior resistance to carburizing atmospheres and sulfidation. |
| Primary Advantage | A versatile, general-purpose heat-resistant alloy with good strength from room temperature to 2100°F (1150°C). | Maximum protection in severe carburizing and sulfur-containing environments. |
| Relationship | The industry-standard workhorse for high-temperature furnaces. | A specialized upgrade for the most aggressive carburizing conditions. |
ASTM B535 UNS N08330 and N08332 Chemical Composition:
ASTM B535 UNS N08330 and N08332 Mechanical properties
ASTM B535 UNS N08330 and N08332 permissible variations
Why the Nickel (Ni) and Chromium (Cr) Content is Critical
Nickel (35%): Provides austenitic stability, ductility, and resistance to thermal cycling, carburization, and chlorine-containing atmospheres.
Chromium (19%): Forms a protective, adherent chromium oxide scale on the surface, providing excellent resistance to oxidation (scaling) and sulfidation.
Why the Silicon (Si) Content is Critical:
Silicon further enhances the formation of a protective surface scale, significantly improving resistance to carburization (carbon pickup) and sulfidation (sulfur attack). The higher silicon in N08332 makes it the preferred choice for the most severe conditions.
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