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Hastelloy B2 Washers Manufacturer & Exporter in India

Explore Hastelloy B2 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 B2 Washers?

Hastelloy B2 washers are nickel-molybdenum alloy fastener components manufactured from UNS N10665 bar or plate stock conforming to ASTM B333 and ASTM B335. The alloy’s exceptionally high molybdenum content (26-30%) delivers outstanding resistance to reducing acid environments, particularly hydrochloric acid at all concentrations and temperatures up to boiling point.

Hastelloy B2 washers are specified wherever standard stainless steel or even other nickel alloys fail due to reducing acid attack. The alloy maintains a tensile strength of 760 MPa minimum in the annealed condition and is widely used under NACE MR0175 guidelines for chemical process flanges, reactor closures, and acid handling equipment where load distribution and corrosion resistance must be achieved simultaneously.

Quick Specifications

MaterialHastelloy B2
UNS NumberN10665
DIN Number2.4617
Material StandardASTM B333 / ASTM B335
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1 / ASME B18.21.1
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength760 MPa (110 ksi) min
Yield Strength350 MPa (51 ksi) min
HardnessMax 35 HRC / 241 HB
FinishPickled / Bright Annealed
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy B2 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy B2 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy B2 Bolts, Hastelloy B2 Nuts, Hastelloy B2 Screws, Hastelloy B2 Studs, and Hastelloy B2 Threaded Rods. All Hastelloy B2 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy B2 Bolts
Hastelloy B2 Nuts
Hastelloy B2 Screws
Hastelloy B2 Studs
Hastelloy B2 Threaded Rods

Technical Data

Hastelloy B2 Washers Dimensions, Sizes & Thread Standards

Hastelloy B2 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (plain washers), DIN 9021 (large OD washers), ISO 7089/7090, and ASME B18.22.1. Custom OD and thickness available. Inch dimensions per ASME B18.22.1. All Hastelloy B2 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

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

Bolt Size (M)ID (mm)OD (mm)Thickness (mm)Large OD DIN 9021 (mm)
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
M4243.0787.0130
M4850.0928.0150
M5658.01059.0175
M6466.01159.0200
M7274.012510.0220
M8082.014012.0250
M100104.017514.0310

Dimensional & Material Standards

StandardCoversSystem
DIN 125Plain washers, normal seriesMetric
DIN 9021Plain washers, large OD seriesMetric
ISO 7089Plain washers, 200 HVMetric
ISO 7090Plain washers, chamfered, 200 HVMetric
ASME B18.22.1Plain washers, inch seriesInch
ASME B18.21.1Spring lock washers, inchInch
ASME B16.5Flange washer setsInch
Material StandardRequirement
ASTM B333Plate/sheet - UNS N10665
ASTM B335Bar/rod - UNS N10665
ASTM F467Fastener mechanical properties
NACE MR0175Sour service hardness limit
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy B2 Chemical Composition

Hastelloy B2 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 B2 washers order from RealBolt.

Chemical Composition per ASTM B333 / ASTM B335

ElementComposition (%)
Nickel (Ni)Balance (min 65%)
Molybdenum (Mo)26.0-30.0%
Iron (Fe)2.0% max
Chromium (Cr)1.0% max
Carbon (C)0.02% max
Silicon (Si)0.10% max
Manganese (Mn)1.0% max
Cobalt (Co)1.0% max
Phosphorus (P)0.04% max
Sulphur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B2 Alloy Composition Matters for Washers

Mo (26–30%) — Reducing Acid Immunity
The exceptionally high molybdenum content gives Hastelloy B2 unmatched resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl — a condition that destroys every grade of stainless steel and most other nickel alloys. Washers in HCl reactor flanges rely on this property to prevent crevice corrosion under the bearing face.
Ultra-Low Carbon (0.02% max) — Sensitisation Prevention
The controlled carbon ceiling prevents carbide precipitation at grain boundaries during fabrication and service. Hastelloy B2 washers retain full corrosion resistance in the as-welded condition without post-weld heat treatment, making them suitable for welded pressure vessel assemblies.
Low Iron and Chromium — Reducing Environment Stability
Unlike alloys designed for oxidising environments, Hastelloy B2 deliberately minimises chromium and iron to maximise performance in reducing acid service. This makes it the preferred washer material for sulphuric acid, phosphoric acid, and acetic acid process equipment where oxidising contaminants are absent.

Fastener Performance

Hastelloy B2 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Hastelloy B2 Washers per ASTM. Hastelloy B2 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 Plain Washers (DIN 125)

Bolt SizeID (mm)OD (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.548
M1617.0303.095
M2021.0373.0148
M2425.0444.0210
M3031.0564.0335
M3637.0665.0490
M4243.0787.0670
M4850.0928.0880
?? Anti-galling note: Apply nickel-based anti-seize to washer bearing faces in high-temperature or acid service. Never use copper-based compounds on nickel alloy components.

Industry Applications

Hastelloy B2 Washers Applications — Industries & End Uses

Hastelloy B2 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 B2 washers application details and RealBolt stock availability.
Hastelloy B2 washers are the standard specification for flange bolt sets in hydrochloric acid production, HCl regeneration units, and chlorination reactor closures. The alloy withstands boiling HCl at all concentrations where every grade of stainless steel and most other nickel alloys fail rapidly. Washers distribute bolt load across flange faces while maintaining full corrosion resistance under the bearing surface.
Plain and large-OD washers for heat exchanger channel covers, pump casing flanges, and agitator shaft seals in sulphuric acid concentration units and phosphoric acid process trains. Hastelloy B2 outperforms Hastelloy C276 in pure reducing acid environments where oxidising contaminants are absent, making it the preferred washer material for these services.
Flange washer sets for pharmaceutical API reactor closures, solvent recovery column flanges, and acetic acid process equipment. The ultra-low carbon content (0.02% max) ensures no sensitisation during sterilisation cycles or elevated-temperature cleaning-in-place (CIP) procedures, maintaining full corrosion resistance throughout the equipment lifecycle.
Washers for hydrogen fluoride alkylation unit flanges, amine treating system connections, and sour water stripper nozzle bolt sets. Hastelloy B2 is specified under NACE MR0175 for sour service applications where H2S and reducing acid conditions combine to attack conventional stainless steel fastener components.

Hastelloy B2 Washers Standards & International Certifications

Hastelloy B2 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 B2 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy B2 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 B2 Washers — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy B2 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 B2 washers selection and pricing.
Hastelloy B2 plain washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7090 (chamfered) for metric bolt sizes M6 through M100. Inch series washers are produced per ASME B18.22.1 for bolt sizes ¼” through 4″. Flange washer sets for ASME B16.5 flanged connections are available as matched sets. Custom OD and thickness combinations are accepted with 15 working day lead time.
Yes – Hastelloy B2 is specifically designed for hydrochloric acid service and provides complete resistance to HCl at all concentrations from ambient temperature up to and including boiling point. The alloy’s 26-30% molybdenum content gives it corrosion rates below 0.1 mm/year in boiling concentrated HCl, a condition that causes rapid failure in Hastelloy C276, duplex stainless steel, and all standard austenitic grades. Washers in HCl reactor flanges benefit from this resistance under the bolt head bearing face where crevice conditions exist.
Hastelloy B2 (UNS N10665) and Hastelloy B3 (UNS N10675) both offer excellent reducing acid resistance, but B3 includes improved thermal stability and better resistance to stress corrosion cracking in the as-welded condition. B2 washers are preferred for pure reducing acid service where cost is a consideration. B3 washers are specified where the process stream contains trace oxidising contaminants or where the assembly will be welded without post-weld heat treatment. We supply both grades – contact our engineering team for a grade recommendation based on your specific process conditions.
Yes – and this is the recommended practice. Using matched-alloy washer, bolt, and nut sets eliminates galvanic corrosion risk between dissimilar metals in aggressive acid environments. We supply complete Hastelloy B2 flange bolt sets including stud bolts, heavy hex nuts, and plain washers from a single heat with one EN 10204 3.1 MTC covering all components. This simplifies procurement, traceability, and inspection documentation for pressure equipment under PED 2014/68/EU and ASME Section VIII requirements.

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