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Duplex 2205 Washers Manufacturer & Exporter in India

Explore Duplex 2205 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 2205 Washers?

Duplex 2205 washers are high-strength, corrosion-resistant flat or shaped washers manufactured from UNS S32205/S31803 duplex stainless steel. This alloy features a balanced austenite-ferrite microstructure, delivering superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking compared to standard austenitic grades like 316L. Duplex 2205 washers are specified for bolted joints in aggressive environments, including offshore, chemical, and marine applications, where both mechanical strength and corrosion resistance are critical.

With a PREN (Pitting Resistance Equivalent Number) of =34, Duplex 2205 washers provide reliable performance in seawater, brine, and acidic process streams. They are manufactured to ASTM A240, ASTM A182, and EN 10088-3 standards, ensuring full traceability and compliance for critical bolted assemblies.

Quick Specifications

MaterialDuplex 2205
UNS NumberS32205 / S31803
DIN Number1.4462
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, Serrated
Size RangeM6-M100 / ¼"-4"
Tensile Strength620 MPa (90 ksi) min
Yield Strength450 MPa (65 ksi) min
HardnessMax 290 HB
? All material certified by NABL-accredited laboratory. PMI and ferrite content available on request.

Complete the Fastener Set

Other Duplex 2205 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Duplex 2205 fastener range from certified duplex stainless steel bar stock, including Duplex 2205 Bolts, Duplex 2205 Nuts, Duplex 2205 Screws, Duplex 2205 Studs, and Duplex 2205 Threaded Rods. All Duplex 2205 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Duplex 2205 Bolts
Duplex 2205 Nuts
Duplex 2205 Screws
Duplex 2205 Studs
Duplex 2205 Threaded Rods

Technical Data

Duplex 2205 Washers Dimensions, Sizes & Thread Standards

Duplex 2205 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. Special shapes per drawing. All Duplex 2205 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Dia (mm)Outer Dia (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
M7273.013010.0
M8081.014010.0
M100101.018012.0

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/sheet - UNS S32205/S31803
ASTM A182Forged bar/washer
EN 10088-3Duplex stainless steel
NACE MR0175Sour service =290 HB
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2205 Chemical Composition

Duplex 2205 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)21.0-23.0%
Nickel (Ni)4.5-6.5%
Molybdenum (Mo)2.5-3.5%
Nitrogen (N)0.14-0.20%
Manganese (Mn)2.0% max
Silicon (Si)1.0% max
Carbon (C)0.03% max
Phosphorus (P)0.03% max
Sulphur (S)0.02% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content available on request.

Why Duplex 2205 Alloy Composition Matters for Washers

Cr (21–23%) + Mo (2.5–3.5%) — Pitting & Crevice Resistance
High chromium and molybdenum content gives Duplex 2205 washers a PREN =34, ensuring excellent resistance to pitting and crevice corrosion under washers in seawater and chloride-rich environments.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen increases yield strength and enhances resistance to stress corrosion cracking, making Duplex 2205 washers ideal for high-load bolted joints exposed to aggressive media.
Balanced Duplex Structure
The dual-phase (austenite-ferrite) microstructure provides a unique combination of mechanical strength and corrosion resistance, outperforming 316L in most industrial washer applications.

Fastener Performance

Duplex 2205 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2205 Washers per ASTM. Duplex 2205 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 full washer face contact and avoid over-tightening to prevent galling. Use with Duplex 2205 bolts/nuts for optimal corrosion resistance.

Industry Applications

Duplex 2205 Washers Applications — Industries & End Uses

Duplex 2205 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 2205 washers are specified for flange joints, riser clamps, and splash zone assemblies on offshore platforms, subsea manifolds, and FPSO topsides. Their high PREN and SCC resistance make them ideal for long-term seawater and brine exposure.
Flat and spring washers for hull penetrations, deck equipment, and propeller shaft assemblies where resistance to pitting and crevice corrosion is essential in saltwater environments.
Washer sets for heat exchanger covers, reactor closures, and process piping flanges in chloride-bearing and acidic media where 316L washers fail due to pitting or SCC.
Duplex 2205 washers are used in high-pressure RO vessel flanges, brine recirculation pumps, and evaporator assemblies, providing long service life in aggressive saline conditions.

Duplex 2205 Washers Standards & International Certifications

Duplex 2205 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 2205 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2205 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

Duplex 2205 Washers — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2205 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 2205 washers selection and pricing.
Duplex 2205 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch). Custom shapes and dimensions can be supplied per drawing, with full traceability and EN 10204 3.1/3.2 certification.
While Duplex 2205 washers can be used with carbon steel bolts, it is recommended to pair them with duplex or austenitic stainless bolts/nuts to avoid galvanic corrosion, especially in wet or marine environments. Consult our engineering team for optimal material pairing.
Yes – Duplex 2205 washers have a PREN =34 and are highly resistant to pitting and crevice corrosion in seawater, making them suitable for submerged and splash zone applications without the need for additional coatings.
No formal MOQ for standard sizes (M6-M36) held ex-stock – we supply from single pieces for urgent requirements. Custom sizes or special shapes may require a 10 kg minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 pcs.

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