Hastelloy Fasteners – The Complete Guide to Corrosion-Resistant Nickel Alloy Bolts, Nuts & Studs
When harsh chemical environments and high temperatures challenge conventional materials, Hastelloy fasteners provide the ultimate solution. RAYCHIN LIMITED, a specialized manufacturer and global supplier of high-performance alloy fasteners, offers a comprehensive range of Hastelloy C276, C22, B2, B3 bolts, nuts, washers, stud bolts, and custom-machined parts. This guide combines product details with in-depth technical knowledge to help you select the right fastener for your critical application.
Product Range
Hastelloy Bolts
Hex bolts, heavy hex bolts, socket head cap screws, anchor bolts. Sizes M6–M64, 1/4″–2″.
Hastelloy Nuts
Hex nuts, heavy hex nuts, lock nuts, nylon insert nuts. Metric and imperial sizes available.
Hastelloy Washers
Plain washers, spring washers, fender washers. Custom OD/ID thickness available.
Hastelloy Stud Bolts
Full threaded and double end studs with 2 nuts. ASME B16.5 / B18.2.1 compliant.
Hastelloy Screws
Machine screws, self-tapping screws, set screws. Drive types: slotted, Phillips, hex socket.
Custom Fasteners
Special threads, non-standard lengths, custom heads, and machined components per drawing.
Material Grades & Standards
Available Sizes & Thread Standards
Larger or special sizes can be manufactured on request. Please contact our sales team for a custom quotation.
What is Hastelloy Alloy? (Technical Guide)
Hastelloy is a family of nickel-based superalloys known for their exceptional corrosion resistance in severe environments. The most common grades for fasteners include C276, C22, B2, and B3. These alloys contain high levels of nickel, chromium, and molybdenum, which provide resistance to a wide range of acids, chlorides, and high-temperature oxidation. Unlike stainless steels, Hastelloy maintains its integrity in both oxidizing and reducing conditions, making it the material of choice for chemical processing, pollution control, and marine applications.
Key Properties of Hastelloy Fasteners
- Exceptional Corrosion Resistance: Resists pitting, crevice corrosion, and stress-corrosion cracking in chloride-rich environments, seawater, and strong acids (sulfuric, hydrochloric, phosphoric).
- High Temperature Strength: Retains mechanical properties at elevated temperatures, up to 1000°C (1832°F) for Hastelloy X in oxidizing atmospheres.
- Versatility: Different grades are optimized for specific environments: C276 for mixed acids, C22 for oxidizing media, B2/B3 for reducing acids.
- Fabricability: Despite high strength, Hastelloy fasteners can be machined and cold formed with appropriate tooling.
Applications of Hastelloy Fasteners
- Chemical Processing: Reactors, heat exchangers, piping systems, and pumps handling corrosive chemicals.
- Marine & Offshore: Seawater-exposed fasteners, subsea connectors, and desalination equipment.
- Pharmaceutical: Equipment requiring ultra-clean, corrosion-resistant components.
- Flue Gas Desulfurization (FGD): Scrubbers and ductwork in power plants.
- Pulp & Paper: Bleaching equipment and digesters.
- Aerospace: High-temperature engine components and exhaust systems.
Quality Assurance & Testing
RAYCHIN LIMITED is committed to supplying Hastelloy fasteners that meet the highest quality standards. Our rigorous quality control includes:
- Material Test Certificates (EN 10204 3.1 / 3.2)
- Positive Material Identification (PMI)
- Intergranular Corrosion (IGC) testing as per ASTM A262
- Hardness and tensile testing
- Salt spray and pitting corrosion tests
- Third-party inspection upon request
How to Select the Right Hastelloy Fastener
- Chemical Environment: Identify the acids, chlorides, and temperature. C276 is a general-purpose grade, while C22 is better for oxidizing environments, and B2/B3 for reducing acids.
- Mechanical Requirements: Confirm tensile strength and hardness requirements. Hastelloy fasteners are typically softer than steel but offer superior corrosion resistance.
- Standards and Certification: Specify ASTM/ASME standards, NACE MR0175 if sour service, and any additional documentation.
- Size and Thread: Confirm diameter, pitch, length, and thread standard. Custom sizes available.
- Quantity and Lead Time: Stock items dispatch within 3-5 days; custom orders typically require 3-6 weeks.
Frequently Asked Questions
What are Hastelloy fasteners and what are they used for?
Hastelloy fasteners are made from nickel-based corrosion-resistant alloys. They are used in chemical processing, marine, pharmaceutical, and pollution control applications where resistance to acids, chlorides, and high temperatures is critical.
Which Hastelloy grades are available for fasteners?
Common grades include Hastelloy C276, C22, B2, B3, and X. Each grade offers specific corrosion resistance properties for different environments.
Which standards do Hastelloy fasteners comply with?
Hastelloy fasteners typically comply with ASTM B574 / ASME SB574 for bars and bolts, and ASTM B335 for B-grade alloys. Other standards include DIN, ISO, and customer specifications.
Can Hastelloy fasteners be used in seawater?
Yes, Hastelloy C276 and C22 offer excellent resistance to seawater corrosion, including pitting and crevice corrosion, making them suitable for marine and offshore applications.
Does RAYCHIN provide material test certificates for Hastelloy fasteners?
Yes, RAYCHIN LIMITED provides EN 10204 3.1 / 3.2 certificates, chemical analysis, tensile reports, PMI, and additional corrosion testing as required.
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