At Unifit Metalloys Inc., we leverage over decades of metallurgical expertise to manufacture high-performance AL6XN fasteners from super duplex stainless steel (UNS N08367). Engineered for exceptional corrosion resistance and strength, these fasteners excel in demanding environments such as offshore oil & gas, chemical processing and desalination where standard stainless steels fall short.
Our products undergo strict quality assurance including chemical analysis, mechanical testing, and dimensional verification in certified labs, meeting global standards like ASTM A182, ASME and DIN. This commitment ensures every fastener delivers precise fit, durability and reliable performance in critical industrial applications.
Partnering with us means choosing a trusted supplier known for technical excellence, compliance, and transparency. Our deep material expertise guarantees fasteners that surpass industry benchmarks for safety, corrosion resistance and mechanical integrity.
Request QuoteWhat are AL6XN Fasteners?
AL6XN fasteners are fastening components such as bolts, nuts, screws, studs and washers manufactured from AL6XN, a high-performance super duplex stainless steel alloy designated as UNS N08367. This alloy is engineered with high chromium (20–22%), nickel (24–26%), molybdenum (6–7%) and nitrogen (0.18–0.22%) contents delivering exceptional resistance against chloride-induced stress corrosion cracking, pitting and crevice corrosion.
These fasteners combine excellent mechanical strength with superior corrosion resistance, making them indispensable for use in aggressive chloride-bearing environments like seawater exposure, chemical plants and offshore structures. AL6XN fasteners maintain their integrity under high temperatures, pressure fluctuations and cyclic stresses ensuring safety and longevity in mission-critical assemblies.
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Types of AL6XN Fasteners
AL6XN fasteners come in a variety of forms to meet diverse industrial requirements. Below is a summary of the key fastener types, their features, and common applications:
AL6XN Fasteners Technical Specifications
To ensure the best fit and performance for your application, it’s essential to understand the key technical specifications of AL6XN fasteners. Crafted from super duplex stainless steel (UNS N08367), these fasteners are manufactured to meet stringent international standards and offer exceptional resistance to harsh environments. Below is a detailed overview of their critical attributes to help you make informed decisions:
| Specification Parameter | Details |
|---|---|
| Material Grade | AL6XN (UNS N08367) |
| Standards | ASTM A182, ASTM A193, ASTM A194, DIN, ISO, ASME |
| Diameter Range | M1.6 to M100 or customized per requirement |
| Length | Up to 5 meters (custom lengths available) |
| Thread Types | Metric, UNC, UNF, BSW, Acme, custom threads |
| Finish / Coating | Plain, Passivated, PTFE Coated, Zinc Plated |
| Corrosion Resistance | Exceptional resistance to pitting, crevice, and chloride stress corrosion cracking |
| Temperature Range | Suitable from cryogenic to elevated temperatures |
| Manufacturing Process | Forged, Machined, Heat Treated |
AL6XN Fasteners Equivalent Grades
Understanding equivalent materials helps ensure compatibility in global projects:
| Standard / Specification | Equivalent Grade / Designation |
|---|---|
| UNS | N08367 |
| EN/DIN | 1.4565 |
| ASTM / ASME | A182 F55, A240, A276 |
| JIS | SUS 329J4L |
| ISO | X2CrNiMoN22-5-3 |
Chemical Composition of AL6XN Fasteners
The chemical composition of AL6XN fasteners is carefully balanced to provide superior corrosion resistance and mechanical strength. The precise amounts of chromium, nickel, molybdenum, and nitrogen work synergistically to enhance durability in aggressive environments. Below is the detailed elemental breakdown of this advanced super duplex stainless steel alloy:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Manganese (Mn) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.015 |
| Silicon (Si) | ≤ 0.80 |
| Chromium (Cr) | 20.0 – 22.0 |
| Nickel (Ni) | 24.0 – 26.0 |
| Molybdenum (Mo) | 6.0 – 7.0 |
| Nitrogen (N) | 0.18 – 0.22 |
| Iron (Fe) | Balance |
Mechanical Properties of AL6XN Fasteners
The table below summarizes the key mechanical properties that make AL6XN fasteners ideal for critical industrial applications:
| Property | Value |
|---|---|
| Tensile Strength | ≥ 830 MPa |
| Yield Strength (0.2% Proof) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (Brinell) | ≤ 320 HB |
| Impact Toughness (Charpy V-notch) | High, including sub-zero temperatures |
| Modulus of Elasticity | ~ 200 GPa |
These properties ensure AL6XN fasteners can withstand mechanical stress, thermal cycling and harsh environmental conditions.
Why Choose AL6XN Fasteners?
AL6XN fasteners offer a premium solution for environments where extreme corrosion resistance and mechanical performance are critical. Featuring a Pitting Resistance Equivalent Number (PREN) typically above 40, AL6XN withstands aggressive chloride-rich conditions such as seawater, brine and harsh chemical media without compromising structural integrity.
Key benefits include:
- Superior resistance to pitting, crevice, and chloride stress corrosion cracking compared to standard duplex and austenitic stainless steels.
- High tensile strength and excellent fatigue resistance to endure dynamic and cyclic loads.
- Exceptional toughness at sub-zero temperatures ensures reliability in varied climates.
- Longevity that minimizes maintenance, downtime, and replacement costs in costly industrial settings.
These attributes make AL6XN fasteners the preferred choice for engineers and project managers demanding durability, safety and operational efficiency in critical infrastructure.
Applications of AL6XN Fasteners
AL6XN fasteners are specifically designed to perform reliably in some of the most challenging industrial environments. Below are the primary industries and uses where AL6XN fasteners deliver exceptional performance:
- Offshore & Marine Structures
- Chemical and Petrochemical Processing
- Desalination Plants
- Food and Beverage Processing
- Power Generation Equipment
- Pharmaceutical and Biotechnology Industries
AL6XN Fasteners Price
The price of AL6XN fasteners is influenced by factors such as fastener type, size, thread specifications, finish/coating, and order volume. Due to the high alloy content and demanding manufacturing process, AL6XN fasteners are priced higher than standard stainless steel grades like 304 or 316. However, their superior corrosion resistance and mechanical durability translate into reduced lifecycle costs by minimizing maintenance and replacements. When sourcing AL6XN fasteners, it is advisable to:
- Request detailed quotations covering material test certificates (MTC) and quality compliance.
- Compare pricing alongside performance and warranty assurances.
- Consider total cost of ownership rather than initial purchase price alone.
Trusted Manufacturer & Supplier of AL6XN Fasteners
At Unifit Metalloys Inc., we bring unmatched expertise in producing and delivering AL6XN fasteners that conform to stringent industry standards. Our state-of-the-art manufacturing facilities utilize advanced forging, machining, and heat-treatment processes to achieve precise dimensions and consistent material properties.
Each fastener undergoes thorough chemical analysis, mechanical testing, and dimensional inspection to meet ASTM A182, ASME SB479, and international specifications. Serving sectors including offshore, chemical, desalination, and heavy engineering, we pride ourselves on timely delivery, responsive technical support, and customized solutions tailored to your project requirements.
Partner with Unifit Metalloys Inc. for dependable, long-lasting AL6XN fastening solutions backed by technical excellence and trusted global supply networks.
Request QuoteFrequently Asked Questions About AL6XN Fasteners
Where are AL6XN fasteners typically used?
They are widely used in offshore oil & gas, chemical processing, desalination plants, marine structures and other harsh environments requiring superior corrosion resistance and strength.
How does AL6XN compare to other stainless steels like 316 or 904L?
AL6XN offers significantly higher resistance to pitting, crevice corrosion and stress corrosion cracking than 316 and 904L making it suitable for more aggressive environments.
Can AL6XN fasteners be custom manufactured?
Yes, we offer custom sizes, thread types and finishes tailored to your specific project requirements.
What is the typical lead time for AL6XN fastener orders?
Lead times vary based on order size, specifications, and stock availability. Standard fasteners are usually delivered within 2-4 weeks while custom orders may take longer.
How do I maintain AL6XN fasteners for optimal performance?
Regular inspection and cleaning, avoiding exposure to incompatible chemicals, and proper installation ensure long-term durability.
Can you supply AL6XN fasteners for international projects?
Yes, we have a global supply chain and export capabilities to serve projects worldwide ensuring compliance with regional standards and delivery requirements.