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Duplex 2304 Washers Manufacturer & Exporter in India

Explore Duplex 2304 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-50

Min Temp

300

Max Temp

🌡

300

Suitable for continuous service up to approximately 300°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.

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7.8

Typical density is approximately 7.8 g/cm³.

Product Overview

What are Duplex 2304 Washers?

Duplex 2304 washers are corrosion-resistant fastener components manufactured from UNS S32304 duplex stainless steel, conforming to ASTM A240 and ASTM A182 standards. This alloy features a balanced dual-phase microstructure of austenite and ferrite, providing superior strength and stress corrosion cracking resistance compared to standard 304/316 stainless steel.

With a PREN of 26-28, Duplex 2304 washers offer excellent resistance to pitting and crevice corrosion in chloride-rich environments, making them ideal for use in chemical processing, desalination, and marine applications. Their high yield strength and moderate nickel content ensure cost-effective performance in demanding bolted joint assemblies.

Quick Specifications

MaterialDuplex 2304
UNS NumberS32304
DIN Number1.4362
Material StandardASTM A240 / ASTM A182
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Fender, Tab, Lock
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength600 MPa (87 ksi) min
Yield Strength400 MPa (58 ksi) min
HardnessMax 290 HB
? All Duplex 2304 washers supplied with full traceability and PMI verification. Third-party inspection available.

Complete the Fastener Set

Other Duplex 2304 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Duplex 2304 fastener range from certified duplex stainless steel bar stock, including Duplex 2304 Bolts, Duplex 2304 Nuts, Duplex 2304 Screws, Duplex 2304 Studs, and Duplex 2304 Threaded Rods. All Duplex 2304 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Duplex 2304 Bolts
Duplex 2304 Nuts
Duplex 2304 Screws
Duplex 2304 Studs
Duplex 2304 Threaded Rods

Technical Data

Duplex 2304 Washers Dimensions, Sizes & Thread Standards

Duplex 2304 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), and ASME B18.22.1. Custom OD/ID and thickness available on request. All Duplex 2304 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch

Flat Washer Dimensions - Metric (DIN 125)

Size (M)ID (mm)OD (mm)Thickness (mm)
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 9021Fender washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM A240Plate - UNS S32304
ASTM A182Forged bar - UNS S32304
EN 10088-2General requirements
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2304 Chemical Composition

Duplex 2304 Washers are produced from a ferritic-austenitic steel with chromium (21–23%), molybdenum (3–3.5%), and nitrogen (0.14–0.20%) controlled per ASTM. Nitrogen is the critical alloying element: it simultaneously raises PREN to ≥ 35 for chloride pitting resistance and strengthens the austenite phase to achieve 450 MPa minimum yield — twice that of SS 316L.

Chemical Composition per ASTM A240 / A182

ElementComposition (%)
Chromium (Cr)21.5-24.5%
Nickel (Ni)3.0-5.5%
Molybdenum (Mo)0.05-0.6%
Nitrogen (N)0.05-0.20%
Manganese (Mn)2.5% max
Silicon (Si)1.0% max
Carbon (C)0.03% max
Phosphorus (P)0.04% max
Sulfur (S)0.015% max
Iron (Fe)Balance
? All heats spectro-tested and PMI-verified. Certificates supplied with every batch.

Why Duplex 2304 Alloy Composition Matters for Washers

Cr (21.5–24.5%) — Corrosion Resistance
High chromium content ensures Duplex 2304 washers resist pitting and crevice corrosion in chloride-rich and marine environments, outperforming 304/316L in many applications.
Dual-Phase Structure — Strength & SCC Resistance
The balanced ferrite-austenite microstructure provides high yield strength and excellent resistance to stress corrosion cracking, making these washers ideal for bolted joints in aggressive media.
Low Nickel — Cost Efficiency
With only 3–5.5% Ni, Duplex 2304 offers a cost-effective alternative to higher nickel alloys while maintaining robust corrosion performance.

Fastener Performance

Duplex 2304 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2304 Washers per ASTM. Duplex 2304 washers achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeRecommended Washer OD (mm)Recommended Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Installation: Ensure washers are flat and free from burrs. Use with Duplex 2304 bolts/nuts for optimal corrosion resistance in assemblies.

Industry Applications

Duplex 2304 Washers Applications — Industries & End Uses

Duplex 2304 Washers from RealBolt are specified across offshore platforms, desalination, pulp and paper, and chemical processing where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Duplex 2304 washers are widely used in desalination plants, reverse osmosis skids, and water treatment facilities for bolted pipe flanges, pump housings, and filter assemblies. Their high resistance to chloride-induced corrosion ensures long service life in brackish and seawater environments.
Flat and spring washers in Duplex 2304 are specified for shipbuilding, offshore platform structures, and splash zone equipment where superior pitting and crevice corrosion resistance is required compared to 316L. Ideal for deck hardware, cable trays, and hull penetrations.
Washer sets for chemical reactors, pulp digesters, and storage tanks in the chemical and paper industries. Duplex 2304 resists organic acids, caustic solutions, and oxidizing media, making it suitable for aggressive process environments.
Duplex 2304 washers are used in hygienic bolted joints for food processing machinery, brewery tanks, and dairy equipment, offering both corrosion resistance and mechanical strength for repeated washdowns and cleaning cycles.

Duplex 2304 Washers Standards & International Certifications

Duplex 2304 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 3.2 (third-party), NACE MR0175/ISO 15156, NORSOK M-630, Charpy impact certificates, and PMI (XRF) 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 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Duplex 2304 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2304 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.
022-6743-7972
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Answers for Buyers

Duplex 2304 Washers — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2304 Washers from RealBolt — covering PREN ≥ 35, NACE MR0175, ASTM A182 F60, sigma-phase limits, sizes, and EN 10204 3.1/3.2 documentation. Contact our technical team directly for project-specific guidance on Duplex 2304 washers selection and pricing.
Duplex 2304 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing or project specification. All washers are manufactured from ASTM A240/A182 UNS S32304 material with full traceability.
While Duplex 2304 washers can be used with carbon steel bolts, it is recommended to pair them with stainless or duplex fasteners to avoid galvanic corrosion, especially in wet or marine environments. For best results, use with Duplex 2304 or 2205 bolts and nuts.
Yes – Duplex 2304 washers offer excellent resistance to pitting and crevice corrosion in seawater and brackish water, outperforming 316L in many marine and desalination applications. They are widely specified for offshore, shipbuilding, and water treatment projects.
Standard sizes (M6-M36) are available ex-stock with no formal MOQ – single pieces can be supplied for urgent maintenance. Custom sizes or special types may require a 10 kg minimum. Price breaks are available at 50, 200, and 500 pieces.

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