Hastelloy Fasteners
Hastelloy fasteners are resistant to some of the most severe chemicals, this very material often finds use in oil & gas sour gas service, chemical processing, power industries flue gas desulfurization systems, off-shore oil and down hole environments, pulp & paper bleaching and digesters, as well as other industrial facets where corrosion is an issue.
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 high performace nickel alloy used for severe corrosion environments
Excellent corrosion resistance to sulfuric & hydrochloric acids
Good mechanical properties at elevated temperatures
Hastelloy fasteners is often used for applications involving:
Sulfuric and hydrochloric acid (h2so4 & hcl)
Sour gas
Chlorides, wet chloride gas and chlorine solutions
Solvents
Formic and acetic acidsgeneral acid corrosion comparison
Acetic anhydride
Hypochlorites
Phosphoric acid
Oil & Gas sour gas service,
Chemical processing,
Power industries flue gas desulfurization systems,
Off-shore oil and down hole environments,
Pulp & paper bleaching and digesters,
As well as other industrial facets where corrosion is an issue.
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RAYCHIN LIMITED
Specialist in Hastelloy Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · CustomtHastelloy Fasteners: Nickel-Based Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments
RAYCHIN LIMITED is a recognized expert in Hastelloy fasteners — from Hastelloy bolts, Hastelloy nuts, Hastelloy screws, Hastelloy washers, Hastelloy stud bolts, Hastelloy threaded rods to custom non-standard configurations across all major Hastelloy grades. Hastelloy alloys are nickel-based superalloys renowned for their exceptional resistance to a wide range of corrosive environments, including strong acids like hydrochloric (HCl) and sulfuric (H₂SO₄), chlorides, and oxidizing agents. These alloys maintain outstanding mechanical properties and oxidation resistance at both cryogenic and elevated temperatures up to 1200°C (2200°F) for certain grades. With nickel-molybdenum-chromium matrices, Hastelloy fasteners outperform stainless steel and titanium in aggressive chemical, petrochemical, and high-temperature applications. Our portfolio includes fasteners manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for the most demanding environments where corrosion resistance and reliability are critical. Hastelloy fasteners are supplied in solution annealed condition with full traceability and third-party certifications.
Complete Range of Hastelloy Fasteners – Types & Configurations
Hastelloy Bolts
Hastelloy bolts manufactured to DIN 931, DIN 933, ISO 4014, ISO 4017, ASME B18.2.1, and aerospace standards. Available in hex head, heavy hex, flange head, and socket head configurations. Ideal for chemical reactors, offshore platforms, and high-temperature assemblies. Available in grades C-276, C-22, B-2, B-3, C-4, and X. Sizes from M6 to M100 (metric) and 1/4" to 4" (inch). Precision rolled threads for superior strength and corrosion resistance.
Hastelloy Nuts
Hastelloy 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. Ideal for pressure vessel closures, valve assemblies, and flange connections in aggressive environments. Available in all Hastelloy grades. Sizes from M3 to M100 (metric) and #4 to 4" (inch).
Hastelloy Screws
Hastelloy screws including hex head screws, socket head cap screws (DIN 912, ISO 4762, ASME B18.3), flat head screws, button head screws, pan head screws, and set screws. Available with various drive types including hex socket, Torx, and slotted. Ideal for instrument connections, valve components, and equipment in acid-laden environments. Sizes from M3 to M36 and #2 to 1-1/2".
Hastelloy Washers
Hastelloy 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 Hastelloy, these washers provide uniform load distribution under bolt heads and nuts. Ideal for flange connections, heat exchanger tube sheets, and vessel assemblies. Sizes from M3 to M100 and #2 to 4".
Hastelloy Stud Bolts
Hastelloy 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 nuclear facilities. Sizes from 1/4" to 4" (M6 to M100).
Hastelloy Threaded Rods
Hastelloy 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 Hastelloy Fasteners
Exceptional Acid Resistance
Hastelloy fasteners offer outstanding resistance to hydrochloric acid (HCl), sulfuric acid (H₂SO₄), phosphoric acid, and acetic acid. C-276 grade resists 40% HCl at 60°C with <0.05mm/year corrosion rate, and 50% H₂SO₄ at 90°C.
High-Temperature Strength
Hastelloy X maintains tensile strength up to 1200°C (2200°F) under short-term exposure, with exceptional oxidation resistance. C-22 and C-276 retain strength up to 1090°C in oxidizing environments.
Chloride & SCC Resistance
Excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. PREN values of 68-73 for C-276 and C-22, far exceeding super duplex grades.
Universal Corrosion Resistance
C-276 offers resistance to both oxidizing and reducing media, making it suitable for multipurpose chemical processing equipment. C-22 provides superior performance in mixed acids and oxidizing chlorides.
NACE MR0175 Approved
Qualified for sour service (H₂S) environments per NACE MR0175 / ISO 15156. Suitable for wellhead equipment, valve assemblies, and subsea connections in oil and gas applications.
Thermal Stability
C-4 maintains ductility and resistance even after long-term exposure to temperatures between 649°C and 1038°C. X-grade offers exceptional resistance to carburization and sulfidation.
Hastelloy Grade Selection Guide
Hastelloy C-276 (UNS N10276 / 2.4819)
The Universal Grade: Nickel-chromium-molybdenum alloy with tungsten addition. Exceptional resistance to a wide range of corrosive media including strong acids, chlorides, and oxidizing agents. Resists HCl, H₂SO₄, and wet chlorine gas. Ideal for chemical reactors, pollution control, and marine applications.
Hastelloy C-22 (UNS N06022)
Superior Oxidizing Media Resistance: Higher chromium content provides enhanced resistance to oxidizing acids and mixed acid environments. Outperforms C-276 in nitric acid and chloride/sulfide environments. Ideal for nuclear waste containers, pickling equipment, and flue gas scrubbers.
Hastelloy B-2 & B-3 (UNS N10665)
Reducing Acid Specialists: High molybdenum content provides exceptional resistance to hydrochloric acid, sulfuric acid, and acetic acid under reducing conditions. Not suitable for oxidizing media. Ideal for HCl acid evaporators and acetic acid reactors.
Hastelloy C-4 (UNS N06455)
Enhanced Thermal Stability: Maintains ductility and corrosion resistance after long-term exposure to 649-1038°C. Resists hydrochloric and sulfuric acid as well as chloride-rich solutions. Ideal for chemical reactors, bleaching systems, and waste treatment.
Hastelloy X (UNS N06002)
High-Temperature Specialist: Exceptional oxidation resistance, high-temperature strength, and fabrication ease up to 1200°C. Resists carburization and stress corrosion cracking in petrochemical applications. Ideal for gas turbine engines, combustor cans, and afterburner components.
Manufacturing Standards for Hastelloy Fasteners
RAYCHIN LIMITED manufactures Hastelloy 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 Hastelloy Fasteners
To serve clients worldwide, RAYCHIN LIMITED manufactures Hastelloy fasteners from material conforming to the following national and international specifications.
UNS N10276 2.4819 UNS N06022 2.4602 UNS N10665 UNS N06002 2.4665 NACE MR0175
Chemical Composition (Weight %) – Hastelloy Alloys
Our Hastelloy fasteners are produced from melts that strictly conform to the limits below per ASTM standards. The nickel-molybdenum-chromium matrix provides the exceptional corrosion resistance and high-temperature strength characteristic of these alloys.
Hastelloy C-276 (UNS N10276 / 2.4819)
Hastelloy C-22 (UNS N06022 / 2.4602)
Hastelloy B-2 (UNS N10665 / 2.4617)
Hastelloy X (UNS N06002 / 2.4665)
Hastelloy C-4 (UNS N06455 / 2.4610)
Expert note: The high nickel content provides resistance to chloride stress corrosion cracking. Molybdenum adds strength and resistance to reducing acids like HCl. Chromium provides resistance to oxidizing media such as nitric acid. Tungsten enhances solid solution strengthening and localized corrosion resistance. The low carbon content prevents sensitization and intergranular corrosion after welding.
Complete Mechanical Properties of Hastelloy Fasteners
Hastelloy fasteners are supplied in the solution annealed condition. The data below represent minimum requirements per ASTM standards unless otherwise noted.
Mechanical Properties by Grade (Solution Annealed)
Physical Properties by Grade
Elevated Temperature Mechanical Properties
Exceptional Corrosion Resistance of Hastelloy Fasteners
Hastelloy alloys offer unparalleled resistance to a wide spectrum of corrosive environments, combining the benefits of high nickel, chromium, and molybdenum content.
Hydrochloric Acid (HCl) Resistance
Hastelloy C-276 fasteners resist 40% HCl at 60°C with <0.05mm/year corrosion rate. B-2 and B-3 grades excel in HCl environments under reducing conditions, making them ideal for HCl acid evaporators and reactors.
Sulfuric Acid (H₂SO₄) Resistance
C-276 offers exceptional resistance to 50% H₂SO₄ at 90°C. C-22 provides superior performance in mixed acid environments containing oxidizing impurities.
Chloride Stress Corrosion Cracking (SCC) Resistance
With high nickel content, Hastelloy fasteners have excellent resistance to chloride SCC. PREN values of 68-73 for C-276 and C-22 provide outstanding pitting and crevice corrosion resistance.
Resistance to Specific Environments
Heat Treatment & Microstructural Stability
Hastelloy fasteners are supplied in the solution annealed condition for optimum corrosion resistance and mechanical properties. Heat treatment parameters vary by grade:
- C-276 & C-22: Solution anneal at 1121-1177°C followed by rapid cooling (water quench).
- B-2 & B-3: Anneal at 1038-1121°C with rapid cooling to avoid intermetallic precipitation.
- X: Solution anneal at 1121-1232°C with air or rapid cooling.
- C-4: Anneal at appropriate temperature with rapid cooling; maintains ductility after long-term exposure to 649-1038°C.
Proper heat treatment ensures the balanced microstructure that provides the exceptional corrosion resistance and mechanical properties characteristic of Hastelloy alloys. All fasteners are fully solution annealed and rapidly quenched to ensure optimal performance.
Special focus: Hastelloy Fasteners for Critical Applications
For the most demanding applications requiring exceptional corrosion resistance and high-temperature strength, RAYCHIN offers Hastelloy fasteners manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Chemical Processing: Reactor bolts, heat exchanger fasteners, distillation column studs, pump and valve hardware, piping flanges handling HCl, H₂SO₄, and mixed acids.
- Oil & Gas / Sour Service: NACE MR0175 compliant fasteners for wellhead equipment, subsea connectors, riser clamp bolts, valve assemblies, and Christmas tree hardware.
- Nuclear Industry: Fasteners for spent fuel reprocessing, reactor components, and radioactive waste handling systems.
- Pharmaceutical Manufacturing: High-purity reactor shafts, solvent recovery systems, API synthesis vessels.
- Aerospace & Gas Turbines: Combustor can fasteners, transition duct bolts, afterburner components, jet engine tailpipe hardware.
- Flue Gas Desulfurization (FGD): Scrubber fasteners, absorber tower bolts, ductwork studs, mist eliminator hardware.
- Marine Engineering: Seawater piping fasteners, propeller bolts, valve studs, offshore platform hardware.
- Pulp & Paper: Bleaching plant fasteners, digester bolts, paper machine 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 B574, B335, B572, B564.
- 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.
All Hastelloy fasteners are supplied with full traceability and third-party NDT upon request. Material certifications included.
Why RAYCHIN LIMITED – The Hastelloy Fastener Authority
Metallurgical competence
Engineers on staff with deep expertise in nickel-based superalloys. We ensure proper solution annealing (1120-1177°C for C-276, 1038-1121°C for B-2) for optimal corrosion resistance across all Hastelloy fasteners. Every heat is verified by in-house PMI testing to confirm chemistry. With precise control over heat treatment parameters, our fasteners provide the exact corrosion resistance required for your application.
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 Hastelloy fasteners meet applicable ASTM, ASME, NACE MR0175, and API standards.
Precision forming & thread rolling
In-house 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. Hot forging parameters carefully controlled to avoid deleterious phase precipitation and maintain corrosion resistance.
Custom solutions
Need a special head style, unusual thread configuration, or custom material certification for your extreme environment application? Our engineering team works with you to produce custom Hastelloy fasteners to your drawing. We provide specialized surface treatments and NACE MR0175 compliant processing per customer requirements.
Contact the Hastelloy fastener experts today
Request a quote for Hastelloy 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 C-276, C-22, B-2, B-3, C-4, or X grades for chemical, nuclear, or high-temperature applications.
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