Alloy 330 Fasteners – The Complete Guide to Nickel-Iron-Chromium High-Temperature Bolts, Nuts & Studs
When industrial furnaces, heat-treating equipment, and carburizing atmospheres demand fasteners that resist oxidation and thermal cycling, Alloy 330 fasteners deliver proven performance. RAYCHIN LIMITED supplies the complete range of Alloy 330 (UNS N08330) bolts, nuts, washers, stud bolts, and custom-machined parts. This guide provides the technical depth engineers need to specify the correct fasteners for extreme high-temperature service.
Product Range
Alloy 330 Bolts
Hex bolts per ASME B18.2.1. Sizes M6–M48 and 1/4″–2″. Ideal for furnace flanges and retorts.
Alloy 330 Stud Bolts
Double-end and fully threaded studs per ASME B16.5 for high-temperature piping connections.
Alloy 330 Nuts
Heavy hex nuts and lock nuts. Proof-load matched to corresponding bolts.
Alloy 330 Washers
Flat and spring washers for thermal cycling applications.
Alloy 330 Threaded Rod
Continuous-thread studding for furnace hardware and heat-treating fixtures.
Custom Alloy 330 Parts
Special threads, non-standard heads, and precision-machined components per drawing.
Material Specifications & Standards
Chemical Composition
Key Properties
- Oxidation Resistance: Up to 1150°C (2100°F) continuous in oxidizing atmospheres.
- Carburization Resistance: Silicon addition provides excellent resistance to carbon absorption in carburizing environments.
- Thermal Shock Resistance: High nickel content provides excellent resistance to thermal cycling and sigma-phase embrittlement.
- Chloride Stress Corrosion Cracking: High nickel content (34–37%) resists chloride SCC in most furnace atmospheres.
- Mechanical Properties (Annealed): Tensile ≥600 MPa, Yield ≥280 MPa[reference:8].
Applications
- Industrial Heating: Furnace muffles, retorts, conveyor systems, and heat-treating baskets[reference:9].
- Petrochemical: Pyrolysis furnace components and reformer hardware.
- Power Generation: Boiler and steam line fasteners.
- Chemical Processing: High-temperature reactor internals and catalyst support hardware.
Quality Assurance
- EN 10204 3.1 / 3.2 Material Test Certificates
- Positive Material Identification (PMI)
- Mechanical testing: tensile, yield, elongation
- High-temperature oxidation testing available
- Third-party inspection upon request
Frequently Asked Questions
What is Alloy 330?
Alloy 330 (UNS N08330) is a nickel-iron-chromium alloy with added silicon for enhanced oxidation and carburization resistance up to 1150°C.
What is the maximum service temperature?
Continuous service up to 1150°C (2100°F) in oxidizing atmospheres, with short-term exposure to 1200°C.
Which standards cover Alloy 330 fasteners?
ASTM B536 (plate/sheet), B511 (bar), B546 (tube).
Does RAYCHIN provide material certificates?
Yes, EN 10204 3.1 / 3.2 and mechanical test reports are standard.
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