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Hastelloy C22 Washers Manufacturer & Exporter in India

Explore Hastelloy C22 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1100

Max Temp

🌡

1100

Suitable for continuous service up to approximately 1100°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Hastelloy C22 Washers?

Hastelloy C22 washers are nickel-chromium-molybdenum-tungsten alloy fastener components manufactured from UNS N06022 bar or plate stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its precisely balanced chemistry – 20-22.5% chromium, 12.5-14.5% molybdenum, and 2.5-3.5% tungsten – delivering outstanding resistance to both oxidising and reducing media simultaneously.

With a PREN exceeding 65, Hastelloy C22 washers outperform C276 and all standard stainless steel grades in mixed-acid, chloride-bearing, and oxidising environments. They are specified under NACE MR0175/ISO 15156 for sour-service bolted assemblies, chemical reactor closures, and pharmaceutical process equipment where contamination-free sealing is mandatory.

Quick Specifications

MaterialHastelloy C22
UNS NumberN06022
DIN Number2.4602
Material StandardASTM B574
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1
Inner Diameter RangeM6-M64 / ¼"-2½"
Outer Diameter Range12mm-130mm
Tensile Strength690 MPa (100 ksi) min
Yield Strength310 MPa (45 ksi) min
HardnessMax 35 HRC / 230 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy C22 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C22 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C22 Bolts, Hastelloy C22 Nuts, Hastelloy C22 Screws, Hastelloy C22 Studs, and Hastelloy C22 Threaded Rods. All Hastelloy C22 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C22 Bolts
Hastelloy C22 Nuts
Hastelloy C22 Screws
Hastelloy C22 Studs
Hastelloy C22 Threaded Rods

Technical Data

Hastelloy C22 Washers Dimensions, Sizes & Thread Standards

Hastelloy C22 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers) / DIN 9021 (large OD) / ISO 7089 / ISO 7093. Custom OD and thickness available. Inch dimensions per ASME B18.22.1. All Hastelloy C22 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Bolt Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)Large OD (DIN 9021)
M66.4121.618
M88.4161.624
M1010.5202.030
M1213.0242.537
M1617.0303.050
M2021.0373.060
M2425.0444.072
M3031.0564.092
M3637.0665.0110
M4243.0787.0125
M4850.0928.0145
M5658.01059.0168
M6466.01159.0185

Dimensional & Material Standards

StandardCoversSystem
DIN 125Flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal seriesMetric
ISO 7093Plain washers, large seriesMetric
ASME B18.22.1Plain washers, inch seriesInch
ASME B16.5Flange washer setsInch
Material StandardRequirement
ASTM B574Bar/rod - UNS N06022
ASTM B575Plate/sheet - UNS N06022
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy C22 Chemical Composition

Hastelloy C22 Washers derive their exceptional acid corrosion resistance from a precisely controlled nickel-molybdenum-chromium composition per ASTM. High molybdenum and tungsten content suppresses pitting and reducing-acid attack; ultra-low carbon (0.01% max) eliminates sensitization risk in welded assemblies. Full elemental composition is certified in the EN 10204 MTC supplied with every Hastelloy C22 washers order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (approx. 56% min)
Chromium (Cr)20.0-22.5%
Molybdenum (Mo)12.5-14.5%
Tungsten (W)2.5-3.5%
Iron (Fe)2.0-6.0%
Cobalt (Co)2.5% max
Carbon (C)0.010% max
Manganese (Mn)0.50% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
Phosphorus (P)0.02% max
Sulphur (S)0.02% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C22 Alloy Composition Matters for Washers

Mo (12.5–14.5%) + W (2.5–3.5%) — Dual Resistance to Oxidising and Reducing Media
The combined molybdenum and tungsten content gives Hastelloy C22 washers a PREN exceeding 65, providing resistance to both oxidising acids (nitric, chromic) and reducing acids (hydrochloric, sulphuric) simultaneously — a capability no single-element alloy can match. This is critical under washer bearing surfaces where crevice conditions concentrate aggressive species.
Ultra-Low Carbon (0.010% max) — Sensitisation-Free Performance
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C22 washers used in welded assemblies retain full intergranular corrosion resistance without post-weld heat treatment, making them ideal for reactor closure flanges and heat exchanger tube sheets.
Cr (20–22.5%) — Superior Oxidising Acid Resistance vs C276
The higher chromium content compared to Hastelloy C276 (15–17% Cr) gives C22 washers measurably better resistance to wet chlorine, hypochlorite solutions, and nitric acid environments — the key reason C22 is preferred in FGD scrubber and bleach plant bolted connections where C276 shows accelerated attack.

Fastener Performance

Hastelloy C22 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Hastelloy C22 Washers per ASTM. Hastelloy C22 washers achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer Bearing Load Reference - Metric Flat Washers (DIN 125)

Washer SizeInner Dia (mm)Outer Dia (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.528
M1617.0303.052
M2021.0373.082
M2425.0444.0118
M3031.0564.0192
M3637.0665.0278
M4243.0787.0385
M4850.0928.0510
?? Installation note: Always use nickel-based anti-seize on mating bolt threads when assembling with Hastelloy C22 washers. Avoid direct contact with copper alloy components to prevent galvanic corrosion.

Industry Applications

Hastelloy C22 Washers Applications — Industries & End Uses

Hastelloy C22 Washers from RealBolt are specified across chemical processing, pharmaceutical, oil and gas, and FGD where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Hastelloy C22 washers application details and RealBolt stock availability.
Hastelloy C22 washers are the preferred choice for bolted flange connections on chemical reactors, distillation columns, and process piping handling mixed acids, chlorinated solvents, and halide-bearing streams. Their dual resistance to oxidising and reducing media eliminates the need for two separate alloy grades across a single process train.
FGD absorber towers, mist eliminator supports, and spray header flanges operate in saturated HCl and H2SO4 environments that rapidly corrode C276 and all stainless grades. Hastelloy C22 washers are specified for all bolted connections in the absorber wet zone, providing measurably longer service life and reduced maintenance shutdowns.
Hastelloy C22 washers are used in pharmaceutical reactor vessel closures, agitator shaft flanges, and CIP/SIP piping connections where FDA-compliant materials, freedom from contamination, and resistance to aggressive cleaning agents (peracetic acid, sodium hypochlorite) are simultaneously required.
NACE MR0175/ISO 15156 compliant Hastelloy C22 washers are specified for subsea wellhead flange assemblies, topside process piping in H2S-bearing service, and chemical injection line connections where standard nickel alloy washers show accelerated crevice attack under the washer bearing face.

Hastelloy C22 Washers Standards & International Certifications

Hastelloy C22 Washers from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 IS 5372 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Hastelloy C22 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C22 Washers — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

Hastelloy C22 Washers — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C22 Washers from RealBolt — covering acid corrosion resistance, NACE MR0175 compliance, ASTM standards, available sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Hastelloy C22 washers selection and pricing.
Hastelloy C22 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7093 for metric sizes. Inch series washers are produced per ASME B18.22.1 in narrow, regular, and wide patterns. Spring washers and lock washers are available to DIN 127 and DIN 6798. Custom profiles – including ASME B16.5 flange face washers and oversized bearing washers – are machined to drawing with 10-15 working day lead time.
Yes – in oxidising acid environments, Hastelloy C22 washers consistently outperform C276. The higher chromium content (20-22.5% vs 15-17% in C276) gives C22 superior resistance to nitric acid, wet chlorine, hypochlorite, and ferric chloride solutions. In reducing environments such as pure hydrochloric acid, performance is broadly comparable. For mixed-acid or alternating oxidising/reducing service – common in FGD scrubbers and bleach plants – C22 is the preferred specification. Consult our engineering team if your process alternates between oxidising and reducing conditions.
Yes – Hastelloy C22 washers supplied in the annealed condition with hardness not exceeding 35 HRC are fully compliant with NACE MR0175/ISO 15156 for use in H2S-bearing oil and gas environments. Each batch is supplied with a hardness survey report. For critical sour service applications, we can supply individual hardness test results per washer on request. Material is certified to EN 10204 3.1 as standard, with 3.2 TPI-witnessed certification available.
In oxidising atmospheres, Hastelloy C22 washers maintain structural integrity and oxidation resistance up to approximately 1038°C. In reducing or sulphur-bearing high-temperature environments, the practical limit is closer to 760°C due to potential sulphidation attack. For cyclic thermal service – such as heat exchanger bolted closures subject to repeated thermal cycling – the low thermal expansion coefficient (12.7 µm/m·°C) minimises differential expansion issues when paired with C22 bolts and nuts of the same alloy.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil