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Hastelloy B3 Washers Manufacturer & Exporter in India

Explore Hastelloy B3 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 B3 Washers?

Hastelloy B3 washers are nickel-molybdenum alloy fastener components manufactured from UNS N10675 bar or plate stock conforming to ASTM B333 and ASTM B335. The alloy’s exceptionally high molybdenum content (28.5-31.5%) delivers outstanding resistance to hydrochloric acid, sulfuric acid, and other strongly reducing environments across a wide temperature range, including boiling concentrations.

Unlike earlier B-series alloys, Hastelloy B3 incorporates controlled additions of chromium, iron, and tungsten that virtually eliminate the thermal instability and knife-line attack problems associated with B-2. These washers are specified under ASME pressure vessel codes and NACE MR0175 for critical flange assemblies in chemical processing, pharmaceutical reactors, and acid handling systems where no other commercially available alloy provides equivalent reducing-acid resistance.

Quick Specifications

MaterialHastelloy B3
UNS NumberN10675
DIN Number2.4600
Material StandardASTM B333 / ASTM B335
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.21.1 / ASME B18.22.1
TypePlain / Flat / Fender / Dock / Structural
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength760 MPa (110 ksi) min
Yield Strength350 MPa (51 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy B3 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy B3 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy B3 Bolts, Hastelloy B3 Nuts, Hastelloy B3 Screws, Hastelloy B3 Studs, and Hastelloy B3 Threaded Rods. All Hastelloy B3 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy B3 Bolts
Hastelloy B3 Nuts
Hastelloy B3 Screws
Hastelloy B3 Studs
Hastelloy B3 Threaded Rods

Technical Data

Hastelloy B3 Washers Dimensions, Sizes & Thread Standards

Hastelloy B3 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers) / DIN 9021 (large OD washers) / ISO 7089. Custom OD and thickness available. Inch dimensions per ASME B18.21.1 and ASME B18.22.1. All Hastelloy B3 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

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

Bolt Size (M)ID (mm)OD (mm)Thickness (mm)OD Large Series (mm)Thickness Large (mm)
M66.4121.6181.6
M88.4161.6242.0
M1010.5202.0302.5
M1213.0242.5373.0
M1617.0303.0503.0
M2021.0373.0604.0
M2425.0444.0725.0
M3031.0564.0926.0
M3637.0665.01106.0
M4243.0787.01258.0
M4850.0928.01459.0
M5658.01059.016510.0
M6466.01159.018511.0
M7274.013010.021012.0
M8082.014512.023014.0
M100104.017514.028016.0

Dimensional & Material Standards

StandardCoversSystem
DIN 125Plain flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal series, 200 HVMetric
ISO 7093Plain washers, large seriesMetric
ASME B18.21.1Helical spring lock washersInch
ASME B18.22.1Plain washersInch
ASME B16.5Flange face washers for flanged jointsInch
Material StandardRequirement
ASTM B333Plate/sheet/strip - UNS N10675
ASTM B335Bar/rod - UNS N10675
ASTM F467Fastener mechanical properties
NACE MR0175Sour service hardness =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy B3 Chemical Composition

Hastelloy B3 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 B3 washers order from RealBolt.

Chemical Composition per ASTM B333 / ASTM B335

ElementComposition (%)
Nickel (Ni)Balance (min 65%)
Molybdenum (Mo)28.5-31.5%
Chromium (Cr)1.0-3.0%
Iron (Fe)1.0-3.0%
Tungsten (W)3.0% max
Cobalt (Co)3.0% max
Carbon (C)0.01% max
Manganese (Mn)3.0% max
Silicon (Si)0.10% max
Aluminum (Al)0.50% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B3 Alloy Composition Matters for Washers

Mo (28.5–31.5%) — Reducing Acid Immunity
The ultra-high molybdenum content gives Hastelloy B3 unmatched resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl. Washers in HCl reactor flanges and acid storage vessel nozzles remain dimensionally stable where all stainless grades fail rapidly.
Low C and Si — Thermal Stability Advantage Over B-2
Carbon is held to 0.01% maximum and silicon to 0.10% maximum, eliminating the grain boundary precipitation and knife-line attack that plagued Hastelloy B-2 in the heat-affected zone of welded assemblies. Washers can be used adjacent to welded joints without sensitisation risk.
Cr + Fe + W Additions — Oxidising Upset Tolerance
Small controlled additions of chromium, iron, and tungsten provide a degree of resistance to mildly oxidising upsets — a critical improvement over B-2 — without compromising the primary reducing-acid performance. This makes Hastelloy B3 washers suitable for processes where trace oxidising contaminants may be present.

Fastener Performance

Hastelloy B3 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Hastelloy B3 Washers per ASTM. Hastelloy B3 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 Stress & Load Reference

Bolt SizeWasher OD (mm)Washer ID (mm)Thickness (mm)Max Bearing Load (kN)
M1224132.538
M1630173.068
M2037213.0108
M2444254.0158
M3056314.0252
M3666375.0368
M4278437.0510
M4892508.0672
?? Galling note: Apply nickel-based anti-seize to washer bearing faces in bolted assemblies. Hastelloy B3 washers are compatible with Hastelloy B3, C-276, and 316L mating surfaces. Avoid direct contact with copper alloys in acid service.

Industry Applications

Hastelloy B3 Washers Applications — Industries & End Uses

Hastelloy B3 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 B3 washers application details and RealBolt stock availability.
Hastelloy B3 flat washers are the standard specification for flange bolt assemblies in HCl synthesis columns, HCl absorption towers, and muriatic acid storage vessel nozzles. The alloy withstands boiling HCl at all concentrations where no stainless or titanium grade survives. Washers prevent flange face galling and distribute bolt load uniformly on soft gasket materials.
Specified for ASME Section VIII pressure vessel nozzle flange bolt sets in phosphoric acid, acetic acid, and mixed reducing acid reactor closures. Hastelloy B3 washers are used under stud bolt nuts to protect flange faces from corrosion and to maintain consistent clamp load on PTFE and spiral wound gaskets throughout thermal cycling.
Used in high-purity pharmaceutical reactor flange assemblies where contamination from corrosion products is unacceptable. Hastelloy B3 washers provide a corrosion-inert bearing surface under bolt heads and nuts in vitamin, amino acid, and active pharmaceutical ingredient (API) synthesis vessels handling reducing acid media.
Flat and large-OD washers for structural connections and equipment mounting in steel pickling lines, aluminium anodising tanks, and electroplating bath frames where HCl and H2SO4 splash and vapour attack standard fastener hardware. Hastelloy B3 washers extend maintenance intervals significantly compared to 316L or even 904L alternatives.

Hastelloy B3 Washers Standards & International Certifications

Hastelloy B3 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 B3 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy B3 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 B3 Washers — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy B3 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 B3 washers selection and pricing.
Hastelloy B3 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7093. Inch-series washers are available per ASME B18.21.1 and ASME B18.22.1. Custom OD and thickness combinations are produced to customer drawings for ASME Section VIII pressure vessel and TEMA heat exchanger applications. All dimensional tolerances conform to the applicable standard unless tighter tolerances are specified on the purchase order.
Yes – Hastelloy B3 washers are fully compatible with Hastelloy C-276, C-22, B-2, and 316L stainless steel bolts and nuts in reducing acid service. When pairing with stainless steel fasteners, verify that the stainless grade is adequate for the process environment, as the washer alone cannot compensate for an inadequate bolt material. Avoid pairing with copper alloy fasteners in acid service due to galvanic incompatibility. In mixed-metal assemblies, consult our engineering team for a galvanic compatibility assessment.
In reducing acid environments, Hastelloy B3 washers perform reliably up to approximately 538°C. Above this temperature in oxidising conditions, the alloy’s limited chromium content restricts oxidation resistance. For high-temperature oxidising service above 400°C, Hastelloy C-276 or Inconel 625 washers are more appropriate. Hastelloy B3 is specifically optimised for ambient to moderate-temperature reducing acid applications where its molybdenum content provides unmatched corrosion resistance.
Hastelloy B3 washers supplied in the annealed condition with hardness not exceeding 35 HRC (241 HB) meet the hardness requirements of NACE MR0175 / ISO 15156 for use in H2S-containing sour service environments. Each batch is supplied with a hardness survey report. However, Hastelloy B3’s primary application is reducing acid service rather than sour gas service – for dedicated sour service washer applications, Hastelloy C-276 or Inconel 625 are more commonly specified. Contact our technical team to confirm suitability for your specific process conditions.

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