AL6XN Set Screws
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
A mid-ranged corrosion resistant 6Mo alloy with good strength
Good corrosion resistance to moderate acids & sea-water
50% stronger than stainless steel
Usable temperature limit of 1000°F
Moderate general corrosion resistance
Excellent chloride / salt water protection
Good performance in phosphoric acid
Moderate resistance to nitric acid
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RAYCHIN LIMITED
Specialist in AL6XN Set Screws · Socket · Square Head · Cup Point · CustomAL6XN Set Screws: Socket Set Screws, Square Head, Cup Point & Custom Configurations
RAYCHIN LIMITED is a recognized expert in AL6XN set screws — from AL6XN socket set screws, AL6XN square head set screws, AL6XN hex socket set screws, AL6XN cup point set screws, AL6XN cone point set screws, AL6XN flat point set screws, AL6XN oval point set screws, AL6XN half dog point set screws to custom non-standard set screw configurations. Originally developed to combat sea water corrosion, AL6XN (UNS N08367) is a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. Also considered a 6-Moly alloy (6% Molybdenum), AL6XN set screws are similar in composition and capabilities to Alloy 926 and SMO 254. With a higher nickel and molybdenum content than Duplex 2205 and Super Duplex 2507, it delivers better corrosion resistance while providing a more cost effective alternative to nickel super alloys like Inconel or Hastelloy in moderately corrosive conditions. Our portfolio includes set screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where exceptional corrosion resistance and positive locking are critical. AL6XN set screws are available in solution annealed condition with precision ground points and full traceability.
Complete Range of AL6XN Set Screws
AL6XN Socket Set Screws – Cup Point
AL6XN socket set screws with cup point manufactured to DIN 913, ISO 4026, and ASME B18.3. Cup point provides maximum holding power by biting into the mating shaft. Ideal for permanent or semi-permanent mounting of gears, pulleys, and collars on shafts in marine and offshore equipment. Available in sizes from #0 to 1" (M1.6 to M24) with hex socket drive. Exceptional corrosion resistance up to 427°C. The 6% molybdenum content ensures outstanding performance in seawater and chloride environments.
AL6XN Socket Set Screws – Cone Point
AL6XN socket set screws with cone point manufactured to DIN 914, ISO 4027, and ASME B18.3. Cone point is designed for use in conical seats or where precise positioning is required. The sharp point provides excellent initial penetration and seating. Ideal for marine applications requiring exact axial location in corrosive environments such as offshore platforms and desalination plants.
AL6XN Socket Set Screws – Flat Point & Oval Point
AL6XN socket set screws with flat point (DIN 915, ISO 4028) for applications requiring frequent adjustment without shaft damage. AL6XN socket set screws with oval point for applications where shaft scoring must be minimized. Ideal for marine and offshore applications where periodic adjustment is required in corrosive environments. Available in all standard sizes with full traceability.
AL6XN Socket Set Screws – Half Dog Point
AL6XN socket set screws with half dog point manufactured to DIN 916, ISO 4029, and ASME B18.3. The half dog point fits into a drilled hole in the shaft for positive locking and location. Ideal for applications requiring the set screw to carry thrust loads or provide positive positioning in marine and offshore equipment where corrosion resistance is critical.
AL6XN Square Head Set Screws
AL6XN square head set screws manufactured to ASME B18.2.2 and DIN 478. Designed for applications where socket drive is not practical or where higher torques are required. Available with cup, cone, flat, and half dog points. Ideal for heavy industrial marine applications and offshore equipment requiring frequent adjustment with wrenches in corrosive environments.
Custom & Specialty AL6XN Set Screws
Need a special point geometry, unusual length, or custom drive configuration for your marine or offshore application? RAYCHIN engineers work with you to produce custom AL6XN set screws to your drawing. Expert solution annealing (1100–1200°C followed by water quenching) precisely controlled for each batch. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards. Precision ground points and special end finishes available.
AL6XN Set Screw Point Styles & Applications
Cup Point
Most common point style. The cup digs into the shaft for maximum holding power. Best for permanent mounting on shafts in corrosive environments.
Cone Point
Sharp 90° cone for use in conical seats or where precise positioning is needed. Provides excellent axial location in marine equipment.
Flat Point
Ground flat end for frequent adjustment without shaft damage. Ideal for applications requiring repeated repositioning in corrosive environments.
Oval Point
Rounded end minimizes shaft scoring. Used where shaft surface must be protected in marine applications.
Half Dog Point
Fits into drilled hole in shaft for positive locking and thrust load capability. Maximum holding strength for critical offshore equipment.
Manufacturing Standards for AL6XN Set Screws
RAYCHIN LIMITED manufactures AL6XN set screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for AL6XN Set Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures AL6XN set screws from material conforming to the following national and international specifications. This ensures full compliance for projects in the Americas, Europe, Asia, and the Middle East.
UNS N08367 AL6XN ASTM B691 ASTM B688 NACE MR0175 1.4501
Chemical Composition (Weight %) – AL6XN Super Austenitic Stainless Steel
Our AL6XN set screws are produced from melts that strictly conform to the limits below per ASTM B691 / UNS N08367. The high levels of chromium, nickel, molybdenum, and nitrogen provide exceptional resistance to pitting and crevice corrosion, with a Pitting Resistance Equivalent (PRE) typically exceeding 45. The high nickel and molybdenum content delivers better corrosion resistance than Duplex 2205 and Super Duplex 2507 in highly aggressive chloride environments. The interstitial strengthening effect of nitrogen gives AL6XN set screws good high strength properties – 50% stronger than standard stainless steel.
Expert note: The high molybdenum (6-7%) and nitrogen (0.18-0.25%) content gives AL6XN a PRE value exceeding 45, providing resistance to pitting and crevice corrosion in seawater and other chloride environments that is far superior to 316L (PRE≈24) and 317L (PRE≈29). The high nickel content (23.5-25.5%) provides exceptional resistance to chloride stress corrosion cracking. This makes AL6XN set screws ideal for offshore, desalination, and FGD applications. The material also meets NACE MR0175 requirements for sour service in oil and gas environments. Carbon helps to prevent sensitization during welding, and chromium enhances pitting and crevice corrosion resistance.
Complete Mechanical Properties of AL6XN Set Screws (Solution Annealed Condition)
AL6XN set screws are supplied in the solution annealed condition (1100–1200°C followed by water quenching). The data below represent typical values per ASTM B691 and manufacturer specifications.
Mechanical Properties at Room Temperature
High Temperature Performance of AL6XN Set Screws
AL6XN maintains good mechanical properties at elevated temperatures, with a suggested operating range from -196°C to 427°C (-320°F to 800°F). It should not be exposed to temperatures above 427°C for prolonged periods due to metallurgical stability considerations. For continuous service, the maximum operating temperature is approximately 400°C. The material maintains excellent oxidation resistance up to 500°C and retains good impact strength at cryogenic temperatures down to -196°C.
Temperature-Dependent Mechanical Properties
Thermal Stability Limits
Corrosion Resistance of AL6XN Set Screws
Originally developed to combat sea water corrosion, AL6XN has expanded its role as being good mid-range corrosion resistant alloy. AL6XN set screws are a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. With a higher nickel and molybdenum content than Duplex 2205 and Super Duplex 2507, it delivers better corrosion resistance while providing a more cost effective alternative to nickel super alloys like Inconel or Hastelloy in moderately corrosive conditions. Seawater is where AL6XN set screws outperform so many alloys providing protection to stress corrosion cracking, pitting and crevice corrosion in a broad range of marine applications. AL6XN set screws contain a minimum of 6% molybdenum content and it is this addition of molybdenum that provides the greatest protection against pitting and crevice corrosion.
Pitting and Crevice Corrosion Resistance
The Pitting Resistance Equivalent (PRE) for AL6XN is typically >45, calculated as PRE = %Cr + 3.3 × %Mo + 16 × %N. This value is significantly higher than 316L (PRE≈24) and 317L (PRE≈29), and even exceeds that of 6% molybdenum alloys like 254SMO. In chloride environments with concentrations of 10,000-70,000 ppm and temperatures of 50-68°C, AL6XN demonstrates virtually no pitting or crevice corrosion.
Stress Corrosion Cracking (SCC) Resistance
Ordinary austenitic steels (304, 316) are prone to chloride stress corrosion cracking at temperatures above 60°C. AL6XN, with its high nickel content (24-25%) and molybdenum (6-7%), exhibits excellent resistance to SCC. In boiling 45% MgCl₂ solution, AL6XN shows no cracking after 1000 hours, while 316 fails in less than 100 hours. The material is approved per NACE MR0175/ISO 15156 for sour service applications in oilfield equipment, applicable to environments containing H₂S, high chloride concentrations, and moderate temperatures.
Critical Corrosion Considerations for Set Screws
- PRE >45: The high Pitting Resistance Equivalent ensures outstanding performance in seawater and aggressive chemical environments. With 6-7% molybdenum content, AL6XN provides exceptional resistance to chloride-induced pitting and crevice corrosion.
- NACE MR0175 Compliance: AL6XN is qualified for sour service (sulfide stress cracking resistance) in oilfield equipment per NACE MR0175/ISO 15156.
- Temperature Limitations: Maximum service temperature for corrosion applications is approximately 400°C. Avoid exposure to temperatures above 427°C for prolonged periods to prevent intermetallic phase precipitation.
- Galvanic Corrosion: When paired with lower-grade materials, galvanic corrosion should be considered. AL6XN is cathodic to most other stainless steels. Proper isolation may be required in mixed-material assemblies.
- Comparison to Duplex: With higher nickel and molybdenum content than Duplex 2205 and Super Duplex 2507, AL6XN delivers better corrosion resistance in highly aggressive chloride environments.
- Cryogenic Applications: Excellent toughness down to -196°C, with impact values of 85 ft-lb at -196°C.
- Point Selection: Cup point for maximum holding, cone point for precise positioning, flat point for frequent adjustment, half dog point for positive locking in drilled holes.
Corrosion Engineering Note: For critical applications in aggressive environments, RAYCHIN LIMITED can provide passivation, specialized coatings (Xylan, PTFE, silver plating), or recommend optimal heat treatment conditions. Third-party corrosion testing per ASTM G31, G48, or G61 available upon request. NACE MR0175 compliant AL6XN set screws available for sour service applications. In many applications, AL6XN serves as a cost-effective substitute for high nickel alloys such as C-276 in moderately corrosive conditions.
Special focus: AL6XN Set Screws for Marine, Offshore & Chemical Applications
For critical applications requiring positive locking and exceptional corrosion resistance, RAYCHIN offers AL6XN set screws manufactured to ASME, DIN, ISO, and customer-specific specifications. Our capabilities include:
- Marine Applications: Seawater cooling systems, ballast water systems, firefighting systems, offshore platforms, desalination plants, shipbuilding, marine instrumentation, subsea equipment, propeller shaft collars, rudder assemblies
- Offshore & Oil & Gas: Offshore platforms, subsea equipment, refinery applications, sour service per NACE MR0175, produced water systems, steam surface condensers, heat exchangers, valve assemblies, pump components
- Chemical Processing: High-temperature reactors, crackers, reformers, heat exchangers, tanks, pumps, valves, and piping exposed to chlorides and acids, processing tanks, vessels, plate and frame heat exchangers, extraction/distillation columns, agitator assemblies
- Flue Gas Desulfurization (FGD): Scrubbers, absorbers, ducting, and piping systems in power plants
- Pulp & Paper: Bleach plants, digesters, storage tanks handling aggressive media, pulp mill bleach systems, pulp bleaching equipment and piping
- Power Generation: FGD scrubbers, cooling water systems, nuclear power water piping, steam surface condensers, supercritical high pressure feed water heaters, turbine components
- Pharmaceutical & Food Processing: Equipment requiring corrosion resistance and purity, caustic chloride systems, food processing equipment, mixing equipment
- Aerospace & Defense: NAS 570 series, MS 913-916 series, naval aerospace applications
- Point Styles: Cup point, cone point, flat point, oval point, half dog point, and custom points
- Drive Types: Hex socket, square head, slotted head (custom options available)
- Thread Specifications: UNC/UNF, metric coarse/fine, UNJ, MJ – all classes up to 3A/6g
- Surface Treatments: Passivation, silver plating (for anti-galling), PTFE coating, Xylan
- NACE MR0175 Compliance: Certified for sour service applications
- Custom: Special point geometries, lengths, and drive configurations per customer drawings
All AL6XN set screws are supplied with full traceability and third-party NDT upon request. Sizes available from M2 to M48 (#0 to 2") in all standard configurations.
Why RAYCHIN LIMITED – The AL6XN Set Screw Authority
Metallurgical competence
Engineers on staff with deep expertise in super austenitic stainless steels. We ensure proper solution annealing (1100–1200°C) and rapid quenching for optimal corrosion resistance and mechanical properties across all AL6XN set screws. Every heat is verified by in-house testing and PMI verification. With 6-7% molybdenum and 24% nickel, our set screws provide exceptional corrosion resistance in aggressive chloride environments. The interstitial strengthening effect of nitrogen gives AL6XN set screws good high strength properties – 50% stronger than standard stainless steel.
Global approvals & traceability
Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available.
Precision point grinding
In-house CNC grinding ensures consistent point geometry and sharpness. Cup points, cone points, and special end configurations produced to tight tolerances. All points precision ground for optimal performance in critical applications. Capability for UNJF-3A threads per MIL-S-8879.
Custom solutions
Need a special point geometry, unusual length, or custom drive configuration for your marine or offshore application? Our CNC turning and grinding departments handle short runs with agility. We also provide specialized coatings and corrosion testing per customer requirements.
Contact the AL6XN set screw experts today
Request a quote for AL6XN socket set screws, square head set screws, cup point, cone point, flat point, oval point, half dog point set screws & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about NACE MR0175 sour service applications or special point geometries.
sales@ray-chin.com | +86 534 2166 566Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.
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