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Duplex 2205 Studs Manufacturer & Exporter in India

Explore Duplex 2205 Studs 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.

⚖

7.8

Typical density is approximately 7.8 g/cm³.

Product Overview

What are Duplex 2205 Studs?

Duplex 2205 studs are high-strength, corrosion-resistant fasteners manufactured from UNS S32205/S31803 duplex stainless steel bar stock conforming to ASTM A276 and ASTM A479. The duplex microstructure, with approximately equal proportions of austenite and ferrite, provides a unique combination of high yield strength (twice that of 316L) and exceptional resistance to chloride-induced pitting, crevice, and stress corrosion cracking.

Duplex 2205 studs are widely specified for flange connections, pressure vessel closures, and structural joints in aggressive environments such as offshore, chemical processing, and desalination plants. They are compliant with NACE MR0175/ISO 15156 for sour service and are a cost-effective alternative to super austenitic and nickel alloy fasteners in many applications.

Quick Specifications

MaterialDuplex 2205
UNS NumberS32205 / S31803
DIN Number1.4462
Material StandardASTM A276 / ASTM A479
Stud Standard (Metric)DIN 976 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / ASTM A193
Thread FormISO Metric / UNC / UNF
Diameter 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 verification 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 Washers, 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 Washers
Duplex 2205 Threaded Rods

Technical Data

Duplex 2205 Studs Dimensions, Sizes & Thread Standards

Duplex 2205 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (metric), ASME B16.5 (inch), and ISO 898-1. Custom lengths in 5mm increments. Inch dimensions available per ASTM A193 and ASME B16.5 for flange bolting. All Duplex 2205 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Stud Length (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.040-2001840200
M81.2550-2502250250
M101.560-3002660300
M121.7570-4003070400
M162.080-5003880500
M202.5100-60044100600
M243.0120-60054120600
M303.5150-80066150800
M364.0180-1000781801000
M424.5200-1000902001000
M485.0220-12001022201200
M565.5250-15001142501500
M646.0280-20001262802000
M726.0320-20001383202000
M806.0360-25001503602500
M1006.0400-30001744003000

Dimensional & Material Standards

StandardCoversThread
DIN 976Threaded rods & studsMetric
ISO 898-1Mechanical propertiesMetric
ASME B16.5Stud bolts for flangesUNC
ASTM A193Stud bolts, high-tempUNC/UNF
ASTM A320Low-temp stud boltsUNC/UNF
Material StandardRequirement
ASTM A276Bar/rod - UNS S32205/S31803
ASTM A479Fastener mechanical
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 Studs 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 A276/A479

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 verification available on request.

Why Duplex 2205 Alloy Composition Matters for Studs

Cr (21–23%) + Mo (2.5–3.5%) — Pitting & Crevice Resistance
The high chromium and molybdenum content gives Duplex 2205 studs a PREN of 34–36, ensuring excellent resistance to pitting and crevice corrosion in chloride-rich environments such as seawater and process brines.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen increases yield strength and enhances resistance to chloride stress corrosion cracking, making Duplex 2205 studs ideal for critical flange and vessel connections in aggressive media.
Balanced Duplex Structure
The dual-phase (austenite-ferrite) structure provides twice the yield strength of 316L and superior resistance to intergranular corrosion, even after welding or hot bolting.

Fastener Performance

Duplex 2205 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2205 Studs per ASTM. Duplex 2205 studs achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121008038
M1625020085
M20500400135
M24850680195
M3017001360310
M3629502360445
M4247003760610
M4870005600800
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by using compatible nuts.

Industry Applications

Duplex 2205 Studs Applications — Industries & End Uses

Duplex 2205 Studs 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 studs and nuts are the preferred choice for ASME B16.5/B16.47 flange connections, pressure vessel closures, and piping supports in offshore platforms, FPSOs, and subsea manifolds. Fully compliant with NORSOK M-650 and NACE MR0175 for sour service and chloride-rich environments.
Stud bolts for high-pressure reverse osmosis (RO) vessels, seawater intake flanges, and brine recirculation systems. Duplex 2205 offers superior resistance to chloride pitting and crevice corrosion compared to 316L, ensuring long service life in saline and brackish water applications.
Flange stud sets for heat exchangers, reactor closures, and process piping in chemical plants handling organic acids, chlorides, and mixed media. Duplex 2205 is specified where both high strength and resistance to stress corrosion cracking are required.
Studs for digester closures, bleach plant piping, and black liquor recovery systems. Duplex 2205 resists corrosion from aggressive bleaching chemicals and maintains mechanical integrity in hot, wet environments.

Duplex 2205 Studs Standards & International Certifications

Duplex 2205 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2205 Studs — 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 Studs — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2205 Studs 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 studs selection and pricing.
Duplex 2205 stud bolts are available to DIN 976 (metric), ASME B16.5 (inch flange studs), ASTM A193 (high-temperature), and ASTM A320 (low-temperature). Custom thread forms (BSW, BSF, Whitworth) and lengths are available on request. All studs are supplied with full traceability and EN 10204 3.1 certification.
Use molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8008 C5-A) on threads and nut faces. This prevents galling and eases disassembly. Avoid copper-based anti-seize in chloride environments to prevent galvanic corrosion. Lubricated torque values should be reduced by 20% compared to dry assembly.
Yes – Duplex 2205 studs have a PREN of 34-36, providing excellent resistance to pitting and crevice corrosion in seawater, brine, and other chloride-rich environments. They are widely used in desalination, offshore, and marine applications. For continuous immersion, ensure correct ferrite content and avoid carbon steel nuts.
No formal MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes and non-standard threads have an MOQ of 10 kg. Flange stud sets are supplied by the set with no 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