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Duplex 2304 Studs Manufacturer & Exporter in India

Explore Duplex 2304 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 2304 Studs?

Duplex 2304 studs are high-strength, corrosion-resistant fasteners manufactured from UNS S32304 duplex stainless steel bar or rod, conforming to ASTM A276 and ASTM A479. This alloy features a balanced dual-phase microstructure of austenite and ferrite, delivering superior mechanical strength (min. 620 MPa tensile) and enhanced resistance to stress corrosion cracking compared to standard austenitic grades.

With a PREN of 26-28, Duplex 2304 studs are widely specified for bolted joints in chloride-bearing environments, including seawater, chemical process piping, and desalination plants. Their low nickel content makes them a cost-effective alternative to 316L and 2205 for moderate corrosion applications, while maintaining excellent weldability and toughness down to -50°C.

Quick Specifications

MaterialDuplex 2304
UNS NumberS32304
DIN Number1.4362
Material StandardASTM A276 / ASTM A479
Stud Standard (Metric)DIN 976 / DIN 975 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / ASME B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M72 / ¼"-3"
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 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 Washers, 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 Washers
Duplex 2304 Threaded Rods

Technical Data

Duplex 2304 Studs Dimensions, Sizes & Thread Standards

Duplex 2304 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (fully threaded) / DIN 975 (threaded rod) / ASME B16.5 (flange studs). Custom cut lengths available in 5mm increments. Inch and metric threads supplied per order.

Stud Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.018202000
M81.2522252000
M101.526302000
M121.7530352000
M162.038402000
M202.544502000
M243.054602000
M303.566702000
M364.078802000
M424.590902000
M485.01021002000
M565.51141202000
M646.01261302000
M726.01381402000

Dimensional & Material Standards

StandardCoversThread
DIN 976Fully threaded studsMetric
DIN 975Threaded rodsMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
Material StandardRequirement
ASTM A276Bar/rod - UNS S32304
ASTM A479Fastener bar - S32304
ASTM A193 B8M Class 1Stud mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2304 Chemical Composition

Duplex 2304 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)21.5-24.5%
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
Sulphur (S)0.015% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content available on request.

Why Duplex 2304 Alloy Composition Matters for Studs

Cr (21.5–24.5%) — Pitting & Crevice Resistance
High chromium content provides Duplex 2304 studs with a PREN of 26–28, ensuring strong resistance to pitting and crevice corrosion in chloride-rich environments such as seawater and process brines.
N (0.05–0.20%) — Strength & SCC Resistance
Nitrogen addition increases yield strength and enhances resistance to stress corrosion cracking, making Duplex 2304 studs reliable for bolted joints exposed to cyclic loading and temperature fluctuations.
Low Nickel — Cost Efficiency
With only 3–5.5% Ni, Duplex 2304 offers a cost-effective alternative to higher nickel alloys, while maintaining superior corrosion resistance compared to 304L and 316L in many industrial applications.

Fastener Performance

Duplex 2304 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2304 Studs per ASTM. Duplex 2304 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)
M12806430
M1618014460
M2035028095
M24600480140
M301200960225
M3621001680325
M4232002560440
M4847003760600
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by using matching nuts or coated hardware.

Industry Applications

Duplex 2304 Studs Applications — Industries & End Uses

Duplex 2304 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 2304 studs are widely used for bolting in produced water treatment skids, injection wellheads, and piping manifolds where moderate chloride levels and sour gas require better SCC resistance than 316L, but 2205 is not justified on cost.
Fully threaded studs and tie rods for reverse osmosis (RO) pressure vessels, seawater intake screens, and brine concentrators, where Duplex 2304’s PREN and low nickel content provide cost-effective corrosion resistance.
Stud bolts for chemical reactor closures, pulp digesters, and bleach plant piping flanges exposed to organic acids, caustics, and chlorides, where Duplex 2304 outperforms 304L/316L in both strength and pitting resistance.
Duplex 2304 studs are specified for structural bolting in bridges, coastal walkways, and architectural facades where high strength, good weldability, and resistance to atmospheric and salt spray corrosion are required.

Duplex 2304 Studs Standards & International Certifications

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

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2304 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.
022-6743-7972
+91 90226 36025
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Answers for Buyers

Duplex 2304 Studs — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2304 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 2304 studs selection and pricing.
Duplex 2304 studs are supplied to DIN 976 (fully threaded), DIN 975 (threaded rod), ASME B16.5 (flange studs), and ASME B18.31.2 (continuous thread). Metric and inch threads available. Custom cut lengths and special thread forms (BSW, BSP, Whitworth) can be supplied on request.
Use a molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8014) on threads and nut faces to prevent galling. Avoid copper-based anti-seize in chloride environments. Lubricated torque values should be reduced by 20% compared to dry assembly.
Yes – Duplex 2304 offers a PREN of 26-28, providing good resistance to pitting and crevice corrosion in seawater, brine, and chloride-rich process fluids. For highly aggressive or stagnant seawater, consider 2205 or super duplex grades for maximum durability.
No MOQ for standard sizes (M10-M36) held in stock – single pieces can be supplied for urgent repairs. Custom diameters or cut lengths have a 10 kg minimum. Flange stud sets are supplied per set with no minimum. Price breaks 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