Alloy 926 Fasteners
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 corrosion resistant 6Mo alloy similar to AL6XN and SMO254
Higher corrosion resistant substitute for 316L
Corrosion resistance comparable to Super Duplex 2507
Similar chemistry to AL6XN and SMO 254
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RAYCHIN LIMITED
Specialist in Alloy 926 Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · CustomAlloy 926 Fasteners: Super-Austenitic Stainless Steel Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Corrosive Environments
RAYCHIN LIMITED is a recognized expert in Alloy 926 fasteners — from Alloy 926 bolts, Alloy 926 nuts, Alloy 926 screws, Alloy 926 washers, Alloy 926 stud bolts, Alloy 926 threaded rods to custom non-standard configurations. Alloy 926 (UNS N08926 / 1.4529) is a super-austenitic stainless steel with 6% molybdenum and nitrogen addition, developed as an enhanced version of Alloy 904L. This high-performance alloy offers exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking in aggressive environments containing chlorides, acids, and hydrogen sulfide. The alloy's high nickel content (24-26%) provides excellent resistance to stress corrosion cracking, while chromium (19-21%) ensures oxidation resistance. Molybdenum (6-7%) and nitrogen (0.15-0.25%) work synergistically to provide superior localized corrosion resistance with a Pitting Resistance Equivalent Number (PREN) greater than 33. Our portfolio includes fasteners manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where corrosion resistance and reliability are critical. Alloy 926 fasteners are supplied in solution annealed condition with full traceability and third-party certifications.
Complete Range of Alloy 926 Fasteners – Types & Configurations
Alloy 926 Bolts
Alloy 926 bolts manufactured to DIN 931 (partial thread), DIN 933 (full thread), ISO 4014, ISO 4017, and ASME B18.2.1 standards. Features hex head, heavy hex, and flange head configurations. Ideal for high-temperature corrosive applications up to 400°C in seawater desalination, flue gas desulfurization, and chemical processing. Available in sizes from M6 to M100 (metric) and 1/4" to 4" (inch) in various lengths. Precision rolled threads for superior strength and corrosion resistance.
Alloy 926 Nuts
Alloy 926 nuts manufactured to DIN 934, ISO 4032, ISO 4033, ISO 4034, and ASME B18.2.2 standards. Available in hex nuts, heavy hex nuts, jam nuts, and lock nuts. Precision tapped to Class 2B and 3B tolerances for reliable engagement with mating bolts and studs. Ideal for marine environments, offshore platforms, and chemical processing equipment. Available in sizes from M3 to M100 (metric) and #4 to 4" (inch). Proof load testing ensures compatibility with mating fasteners.
Alloy 926 Screws
Alloy 926 screws including hex head screws (DIN 931, DIN 933), socket head cap screws (DIN 912, ISO 4762, ASME B18.3), Torx drive screws, flat head screws, button head screws, pan head screws, and set screws. Available with various drive types including hex socket, Torx, Phillips, and slotted. Ideal for instrument connections, valve assemblies, and equipment requiring corrosion-resistant fasteners in chloride-laden environments. Sizes from M3 to M36 and #2 to 1-1/2".
Alloy 926 Washers
Alloy 926 washers manufactured to DIN 125, DIN 9021, ISO 7089, ISO 7093, and ASME B18.22.1 standards. Available in flat washers, heavy washers, and spring washers. Precision stamped or machined from solution annealed Alloy 926, these washers provide uniform load distribution under bolt heads and nuts. Ideal for flange connections, heat exchanger tube sheets, and vessel assemblies in corrosive environments. Sizes from M3 to M100 and #2 to 4".
Alloy 926 Stud Bolts
Alloy 926 stud bolts manufactured to DIN 938, DIN 939, DIN 976, ASME B16.5, and ASME B18.31.2 standards. Available in double-end studs, fully threaded studs, and tap-end studs. Designed for flange connections, pressure vessel closures, and heat exchanger applications in aggressive environments. Essential for ASME B16.5 flange bolting in chemical plants, offshore platforms, and desalination facilities. Sizes from 1/4" to 4" (M6 to M100) in various lengths.
Alloy 926 Threaded Rods
Alloy 926 threaded rods manufactured to DIN 975, DIN 976, ASME B18.31.1M, and ASME B18.31.2 standards. Continuous threads along the entire length allow for cutting to any required length for custom applications. Ideal for pipe supports, flange connections, and structural assemblies in corrosive environments. Available in diameters from 1/4" to 4" (M6 to M100) in standard lengths up to 6 meters. Precision rolled threads for superior strength and consistency.
Key Benefits of Alloy 926 Fasteners
Exceptional Pitting & Crevice Corrosion Resistance
The combination of 6-7% molybdenum and 0.15-0.25% nitrogen provides outstanding resistance to localized corrosion in chloride-containing environments. Pitting Resistance Equivalent Number (PREN) greater than 33, far superior to 316L and 904L stainless steels.
Chloride SCC Immunity
With 24-26% nickel content, Alloy 926 offers practical immunity to chloride stress corrosion cracking in marine and brackish water applications where standard stainless steels would fail.
Superior Acid Resistance
Excellent resistance to sulfuric, phosphoric, and organic acids, even when contaminated with chlorides. Copper addition (0.5-1.5%) enhances resistance to reducing acids.
Sour Service Approved
NACE MR0175 / ISO 15156 qualified for H₂S environments. Suitable for wellhead equipment, valve assemblies, and subsea connections in oil and gas applications.
High Mechanical Strength
Nitrogen addition significantly enhances yield and tensile strengths compared to conventional austenitic stainless steels. Yield strength ≥300 MPa, tensile strength ≥650 MPa.
Temperature Versatility
Maintains useful mechanical properties up to 400°C (752°F) with VdTÜV approval for pressure vessel applications from -196°C to 400°C. Good toughness down to cryogenic temperatures.
Manufacturing Standards for Alloy 926 Fasteners
RAYCHIN LIMITED manufactures Alloy 926 fasteners 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 Alloy 926 Fasteners
To serve clients worldwide, RAYCHIN LIMITED manufactures Alloy 926 fasteners from material conforming to the following national and international specifications.
UNS N08926 1.4529 ASTM B649 ASME SB649 NACE MR0175 6Mo Cronifer 1925 hMo NS1422
Chemical Composition (Weight %) – Alloy 926 (UNS N08926 / 1.4529)
Our Alloy 926 fasteners are produced from melts that strictly conform to the limits below per ASTM B649 / ASME SB649. The high nickel content provides immunity to chloride stress corrosion cracking, while chromium ensures oxidation resistance. Molybdenum and nitrogen work synergistically to provide exceptional resistance to pitting and crevice corrosion.
Expert note: The high nickel content (24-26%) ensures a stable austenitic structure and provides excellent resistance to chloride stress corrosion cracking. Molybdenum (6-7%) and nitrogen (0.15-0.25%) work synergistically to provide exceptional pitting and crevice corrosion resistance with a Pitting Resistance Equivalent Number (PREN) greater than 33. Copper addition (0.5-1.5%) enhances resistance to sulfuric acid. Ultra-low carbon (<0.02%) prevents sensitization and maintains corrosion resistance in the as-welded condition.
Complete Mechanical Properties of Alloy 926 Fasteners (per ASTM B649)
Alloy 926 fasteners are supplied in the solution annealed condition (1150-1200°C followed by rapid water quenching). The data below represent minimum requirements per ASTM B649 / ASME SB649 unless otherwise noted.
Room Temperature Mechanical Properties (Solution Annealed)
Elevated Temperature Mechanical Properties
Alloy 926 maintains useful mechanical properties at elevated temperatures up to approximately 400°C (752°F), with VdTÜV approval for pressure vessel applications from -196°C to 400°C.
Impact Properties
Physical Properties
Exceptional Corrosion Resistance of Alloy 926 Fasteners
Alloy 926 is a high-performance super-austenitic stainless steel with outstanding resistance to a wide range of corrosive environments.
Pitting and Crevice Corrosion Resistance
The combination of 6-7% molybdenum and 0.15-0.25% nitrogen provides exceptional resistance to localized corrosion in chloride-containing environments. The Pitting Resistance Equivalent Number (PREN) is greater than 33, significantly higher than 316L (PREN ~25) and 904L (PREN ~32).
Chloride Stress Corrosion Cracking (SCC) Resistance
With 24-26% nickel content, Alloy 926 fasteners have excellent resistance to chloride stress corrosion cracking, making them ideal for marine environments, seawater desalination, and offshore applications.
Sulfuric and Phosphoric Acid Resistance
Excellent resistance to sulfuric acid, phosphoric acid, and organic acids, even when contaminated with chlorides. Copper addition (0.5-1.5%) enhances resistance to reducing acids. Widely used in phosphoric acid production evaporators and heat exchangers.
Seawater Resistance
Outstanding performance in marine environments, including seawater desalination systems, offshore platforms, and fire extinguishing systems. Resists pitting and crevice corrosion in chloride-laden seawater.
Resistance to Other Media
Heat Treatment & Microstructural Stability
Alloy 926 fasteners are supplied in the solution annealed condition for optimum corrosion resistance. Solution annealing should be performed at 1150-1200°C (2102-2192°F), preferably at 1170°C (2138°F), followed by rapid water quenching.
The alloy has minimal tendency to form intermetallic phases compared to similar steels with only 18% nickel content. However, improper heat treatment or exposure to temperatures between 600-1000°C can lead to precipitation of molybdenum-rich phases, chromium depletion zones, and reduced corrosion resistance. All fasteners are fully solution annealed and rapidly quenched to ensure optimal performance.
Special focus: Alloy 926 Fasteners for Critical Applications
For critical applications requiring exceptional corrosion resistance in aggressive environments, RAYCHIN offers Alloy 926 fasteners manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Seawater Desalination: RO plant fasteners, evaporator studs, piping flanges, pump bolts, valve assembly fasteners.
- Offshore Oil & Gas: NACE MR0175 compliant fasteners for wellhead equipment, subsea connectors, valve assemblies, riser clamp bolts.
- Flue Gas Desulfurization (FGD): Scrubber fasteners, absorber tower bolts, ductwork studs, mist eliminator hardware.
- Chemical Processing: Reactor bolts, heat exchanger fasteners, distillation column studs, pump and valve hardware.
- Phosphoric Acid Production: Evaporator bolts, heat exchanger studs, reactor vessel fasteners, piping flanges.
- Pulp & Paper: Bleaching plant fasteners, digester bolts, paper machine hardware.
- Marine Engineering: Seawater piping fasteners, propeller bolts, valve studs, offshore platform hardware.
- Power Generation: Condenser bolts, cooling water system fasteners, FGD hardware.
- Standards: DIN 931, DIN 933, DIN 934, DIN 912, DIN 938, DIN 939, DIN 975, DIN 976 (metric); ASME B18.2.1, ASME B18.2.2, ASME B18.3, ASME B16.5 (inch); ASTM B649, NACE MR0175.
- Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
- Sizes: M3 through M100, #2 through 4".
- Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU, VdTÜV.
All Alloy 926 fasteners are supplied with full traceability and third-party NDT upon request. Material certifications included.
Why RAYCHIN LIMITED – The Alloy 926 Fastener Authority
Metallurgical competence
Engineers on staff with deep expertise in super-austenitic stainless steels. We ensure proper solution annealing (1150-1200°C) for optimal corrosion resistance across all Alloy 926 fasteners. Every heat is verified by in-house PMI testing to confirm chemistry. With 24-26% nickel, 6-7% molybdenum, and nitrogen addition, our fasteners provide exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
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. All Alloy 926 fasteners meet applicable ASTM B649, ASME SB649, NACE MR0175, and all relevant fastener standards.
Precision forming & thread rolling
In-house CNC cold heading, hot forging, and precision thread rolling capabilities ensure consistent head dimensions and thread geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. 100% thread and dimensional inspection available. Controlled underhead fillet for improved fatigue resistance.
Custom solutions
Need a special head style, unusual thread configuration, or custom material certification for your corrosive application? Our engineering team works with you to produce custom Alloy 926 fasteners to your drawing. We provide specialized surface treatments, passivation, and NACE MR0175 compliant processing per customer requirements.
Contact the Alloy 926 fastener experts today
Request a quote for Alloy 926 bolts, nuts, screws, washers, stud bolts, threaded rods & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about seawater resistant fasteners, NACE MR0175 sour service requirements, or high-temperature applications.
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