Hastelloy Washers
Hastelloy Washers 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 Washers · Flat Washers · Heavy Washers · Spring Washers · CustomHastelloy Washers: Nickel-Based Superalloy Washers for Extreme Environments
RAYCHIN LIMITED is a recognized expert in Hastelloy washers — from Hastelloy flat washers, Hastelloy heavy washers, Hastelloy spring washers 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 (2192°F) for certain grades. With nickel-molybdenum-chromium matrices, Hastelloy washers outperform stainless steel and titanium in aggressive chemical, petrochemical, and high-temperature applications. Washers are essential components that distribute the load of threaded fasteners, prevent galling, and provide proper bearing surfaces. Our portfolio includes washers 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 washers are supplied in solution annealed condition with full traceability and third-party certifications.
Complete Range of Hastelloy Washers – Types & Configurations
Flat Washers (DIN 125 / DIN 9021 / ISO 7089 / ASME B18.22.1)
Hastelloy flat washers manufactured to DIN 125, DIN 9021, ISO 7089, ISO 7090 (chamfered), and ASME B18.22.1 standards. Available in narrow series (Type A) for general applications and wide series (Type B) for increased bearing area. Precision stamped or machined from solution annealed Hastelloy, these washers provide uniform load distribution under bolt heads and nuts. Ideal for high-temperature corrosive applications up to 1200°C (2192°F) for grade X, and up to 1090°C (1994°F) for C-276 and C-22. Available in sizes from #0 to 4" (M1.6 to M100) with various thickness options. Supplied with deburred edges and passivated finish per ASTM A967.
Heavy Washers (DIN 434 / DIN 435 / ASME B18.22.1)
Hastelloy heavy washers manufactured to ASME B18.22.1 (Type B heavy series), DIN 434, DIN 435, and ASTM F436 standards. Extra thickness provides increased bearing area and load distribution for heavy-duty bolting applications in corrosive environments. Essential for high-temperature flange connections where bolt preload must be maintained. Available in grades C-276, C-22, B-2, and X for various corrosive media. Sizes from 1/4" to 4" (M6 to M100). Suitable for pressure vessel closures, heat exchanger tube sheets, and API 6A wellhead equipment. NACE MR0175 compliant for sour service applications.
Spring Washers (DIN 6796 / DIN 127 / ASME B18.21.1)
Hastelloy spring washers including Belleville disc springs, wave washers, and split lock washers manufactured to DIN 6796, DIN 127, and ASME B18.21.1 standards. These washers provide controlled spring force to maintain clamp load during thermal cycling and vibration. Hastelloy's excellent high-temperature properties make it ideal for spring washers operating up to 1200°C (2192°F) for grade X. Available in various load ratings and deflection characteristics. Ideal for gas turbine assemblies, furnace components, and high-temperature valve applications where bolt relaxation must be compensated.
Hastelloy Grade Selection Guide for Washers
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. Maximum service temperature: 1090°C (1994°F) in oxidizing atmospheres, 425°C (797°F) in reducing environments. Ideal for chemical processing and pollution control.
Hastelloy C-22 (UNS N06022 / 2.4602)
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. Maximum service temperature: 1090°C (1994°F) in oxidizing atmospheres, 425°C (797°F) in reducing environments. Ideal for nuclear waste containers and flue gas scrubbers.
Hastelloy B-2 & B-3 (UNS N10665 / N10675 / 2.4617 / 2.4600)
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. Maximum service temperature: 400°C (752°F) in HCl environments. Ideal for HCl acid evaporators and acetic acid reactors.
Hastelloy X (UNS N06002 / 2.4665)
High-Temperature Specialist: Exceptional oxidation resistance, high-temperature strength, and fabrication ease up to 1200°C (2192°F). Resists carburization and stress corrosion cracking in petrochemical applications. Ideal for gas turbine engines, combustor cans, and afterburner components.
Hastelloy Washer Design & Standards
Dimensional Standards
Our Hastelloy washers meet or exceed the following specifications:
Available in inch and metric sizes from #0 to 4" (M1.6 to M100).
Material Specifications by Grade
- C-276: ASTM B574 / ASME SB574, ASTM B564, AMS 5754
- C-22: ASTM B574 / ASME SB574, ASTM B564
- B-2: ASTM B335 / ASME SB335, ASTM B564
- B-3: ASTM B335 / ASME SB335, ASTM B564
- C-4: ASTM B574 / ASME SB574, ASTM B564
- X: ASTM B572, ASTM B564, AMS 5754, AMS 5798
Surface Finish Options
- Passivated: Per ASTM A967 for maximum corrosion resistance
- Electropolished: For clean room and pharmaceutical applications
- PTFE Coated: For anti-galling and lubricity
- As-Formed: Clean, deburred edges
Key Benefits of Hastelloy Washers
Exceptional Acid Resistance
Hastelloy washers 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. B-2 grade resists 30% HCl at boiling point with corrosion rate <0.5mm/year.
High-Temperature Strength
Hastelloy X maintains tensile strength of 240 MPa at 1000°C, with exceptional oxidation resistance up to 1200°C. C-276 retains useful strength up to 1090°C in oxidizing environments. Minimum tensile strength: 690 MPa for C-276, 655 MPa for X.
Load Distribution
Proper washer selection prevents galling, distributes bolt preload evenly, and protects the surface finish of mating components. Essential for maintaining joint integrity in corrosive and high-temperature environments.
Chloride & SCC Resistance
Excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. PREN values: C-276 ~68, C-22 ~66, far exceeding super duplex grades. High nickel content (>50%) provides immunity to chloride SCC.
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. Grades C-276, C-22, C-4, and X are approved for sour service.
Multiple Configurations
Available in flat, heavy, spring, and custom configurations to suit specific application requirements. Custom sizes and thicknesses available for unique applications. Precision stamped or machined for exact dimensions.
Manufacturing Standards for Hastelloy Washers
RAYCHIN LIMITED manufactures Hastelloy washers 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 Washers
To serve clients worldwide, RAYCHIN LIMITED manufactures Hastelloy washers 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 washers 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)
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 in most grades prevents sensitization and intergranular corrosion after welding.
Complete Mechanical Properties of Hastelloy Washers
Hastelloy washers 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 Tensile Strength (Hastelloy X - Typical Values)
Elevated Temperature Mechanical Properties
Exceptional Corrosion Resistance of Hastelloy Washers
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 washers 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, with corrosion rates <0.5mm/year in 30% HCl at boiling point.
Sulfuric Acid (H₂SO₄) Resistance
C-276 offers corrosion rate <0.1mm/year in 50% H₂SO₄ at 90°C. C-22 provides superior performance in mixed acid environments containing oxidizing impurities. B-2 shows excellent resistance in 50% H₂SO₄ at 100°C with <0.1mm/year.
Chloride Stress Corrosion Cracking (SCC) Resistance
With high nickel content (>50%), Hastelloy washers have excellent resistance to chloride SCC. PREN values: C-276 = (Cr + 3.3Mo + 16N) ≈ 68, C-22 ≈ 66, providing outstanding pitting and crevice corrosion resistance.
Resistance to Specific Environments
Heat Treatment & Microstructural Stability
Hastelloy washers 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 (2050-2150°F) followed by rapid cooling (water quench).
- B-2 & B-3: Anneal at 1066-1121°C (1950-2050°F) with rapid cooling to avoid intermetallic precipitation.
- X: Solution anneal at 1121-1232°C (2050-2250°F) with air or rapid cooling.
- C-4: Anneal at 1066-1121°C (1950-2050°F) with rapid cooling.
Proper heat treatment ensures the balanced microstructure that provides the exceptional corrosion resistance and mechanical properties characteristic of Hastelloy alloys. All washers are fully solution annealed and rapidly quenched to ensure optimal performance.
Special focus: Hastelloy Washers for Critical Applications
For the most demanding applications requiring exceptional corrosion resistance and high-temperature strength, RAYCHIN offers Hastelloy washers manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Chemical Processing: Flange washers for ASME B16.5 connections, manway cover washers, reactor closure washers, heat exchanger tube sheet washers handling HCl, H₂SO₄, and mixed acids.
- Oil & Gas / Sour Service: NACE MR0175 compliant washers for wellhead equipment, valve assemblies, subsea flanges, and API 6A closures.
- Nuclear Industry: Washers for spent fuel reprocessing, reactor components, and radioactive waste handling systems.
- Pharmaceutical Manufacturing: High-purity reactor flanges, clean room equipment, sanitary piping flanges.
- Aerospace & Gas Turbines: Combustor can washers, transition duct fasteners, afterburner components, jet engine tailpipe hardware.
- Flue Gas Desulfurization (FGD): Scrubber internals, absorber tower flanges, ductwork connections, mist eliminator supports.
- Marine Engineering: Seawater piping flanges, pump connections, valve assemblies, offshore platform hardware.
- Pulp & Paper: Bleaching plant flanges, digester connections, paper machine hardware.
- Standards: DIN 125, DIN 9021, ISO 7089, ISO 7093 (metric); ASME B18.22.1 (inch); DIN 127, DIN 6796, ASME B18.21.1 (spring washers).
- Types: Flat washers, heavy washers, spring washers, Belleville washers, wave washers, split lock washers.
- Sizes: #0 through 4", M1.6 through M100.
- Thickness: Standard, heavy, and custom thicknesses available.
- Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU.
All Hastelloy washers are supplied with full traceability and third-party NDT upon request. Supplied with matching Hastelloy bolts, studs, and nuts for complete bolting sets. Material certifications included.
Why RAYCHIN LIMITED – The Hastelloy Washer Authority
Metallurgical competence
Engineers on staff with deep expertise in nickel-based superalloys. We ensure proper solution annealing (1120-1177°C for C-276, 1066-1121°C for B-2) for optimal corrosion resistance across all Hastelloy washers. Every heat is verified by in-house PMI testing to confirm chemistry. With precise control over heat treatment parameters, our washers 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 washers meet applicable ASTM, ASME, NACE MR0175, and API standards.
Precision stamping & finishing
In-house precision stamping and CNC machining capabilities ensure consistent washer dimensions and superior surface finish. Burr-free edges and tight dimensional tolerances. 100% dimensional inspection available. Ultrasonic cleaning and passivation available for critical applications. Flatness and parallelism maintained to strict tolerances.
Custom solutions
Need a special size, unusual thickness, or custom configuration for your extreme environment application? Our engineering team works with you to produce custom Hastelloy washers to your drawing. We provide specialized surface treatments and NACE MR0175 compliant processing per customer requirements.
Contact the Hastelloy washer experts today
Request a quote for Hastelloy washers, flat washers, heavy washers, spring washers & 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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