+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

Duplex 2304 Screws Manufacturer & Exporter in India

Explore Duplex 2304 Screws Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 Screws?

Duplex 2304 screws are high-strength, corrosion-resistant fasteners manufactured from UNS S32304 duplex stainless steel, conforming to ASTM A479 and ASTM A276 standards. This alloy features a balanced dual-phase microstructure of austenite and ferrite, delivering superior mechanical strength (min. 620 MPa tensile) and excellent resistance to chloride-induced pitting and crevice corrosion.

With a PREN of 26-28, Duplex 2304 screws outperform 316L in aggressive environments, making them ideal for marine, chemical, and structural applications where both corrosion resistance and cost-effectiveness are critical. They are widely specified for pressure vessels, piping systems, and offshore structures requiring reliable, long-life fastening solutions.

Quick Specifications

MaterialDuplex 2304
UNS NumberS32304
DIN Number1.4362
Material StandardASTM A479 / ASTM A276
Screw Standard (Metric)DIN 912 / DIN 7991 / ISO 4762
Screw Standard (Inch)ASME B18.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM3-M48 / 1/8"-2"
Tensile Strength620 MPa (90 ksi) min
Yield Strength450 MPa (65 ksi) min
HardnessMax 290 HB / 30 HRC
? 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 Washers, 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 Washers
Duplex 2304 Studs
Duplex 2304 Threaded Rods

Technical Data

Duplex 2304 Screws Dimensions, Sizes & Thread Standards

Duplex 2304 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (hex socket head cap), DIN 7991 (countersunk), ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3. All Duplex 2304 screws dimensions are verified against applicable DIN, ISO, and ASME B18

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Hex Socket (mm)Min L (mm)Max L (mm)
M30.55.53.02.5650
M40.77.04.03.0860
M50.88.55.04.01070
M61.010.06.05.01280
M81.2513.08.06.016100
M101.516.010.08.020120
M121.7518.012.010.025150
M162.024.016.014.030200
M202.530.020.017.035250
M243.036.024.019.040300
M303.545.030.022.050400
M364.054.036.027.060500
M424.563.042.032.070600
M485.072.048.036.080700

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 7991Countersunk socket screwsMetric
ISO 4762Hex socket head screwsMetric
ASME B18.3Socket cap, flat, button headUNC/UNF
ISO 14581Hexalobular socket screwsMetric
Material StandardRequirement
ASTM A479Bar/rod - UNS S32304
ASTM A276Forged/rolled bar
ASTM F2281Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2304 Chemical Composition

Duplex 2304 Screws 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 A479

ElementComposition (%)
Chromium (Cr)21.5-24.5
Nickel (Ni)3.0-5.5
Molybdenum (Mo)0.05-0.6
Nitrogen (N)0.05-0.2
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 verified by NABL-accredited spectrometry. PMI and ferrite content verification available on request.

Why Duplex 2304 Alloy Composition Matters for Screws

Cr (21.5–24.5%) — Pitting & Crevice Resistance
High chromium content ensures Duplex 2304 screws resist pitting and crevice corrosion in chloride-rich environments, outperforming 316L in marine and chemical service.
N (0.05–0.2%) — Strength & Toughness
Nitrogen addition increases yield strength and toughness, allowing Duplex 2304 screws to maintain high mechanical properties even after welding or cold working.
Balanced Duplex Structure
The dual-phase (austenite/ferrite) microstructure provides a unique combination of strength and corrosion resistance, making Duplex 2304 screws ideal for demanding structural and process applications.

Fastener Performance

Duplex 2304 Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M61198.5
M8272214.5
M10544323.0
M12937533.0
M1622518057.0
M2044035289.0
M24760608128.0
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by using proper lubrication.

Industry Applications

Duplex 2304 Screws Applications — Industries & End Uses

Duplex 2304 Screws 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 screws are widely used in reverse osmosis plants, seawater intake structures, and water treatment equipment where high resistance to chloride-induced corrosion and cost efficiency are required.
Socket head cap screws and countersunk screws for shipbuilding, offshore platform walkways, and splash zone assemblies where Duplex 2304’s PREN and mechanical strength outperform 316L and 304L.
Fasteners for chemical reactors, pulp digesters, and process piping in environments containing organic acids, chlorides, and caustics where Duplex 2304 resists stress corrosion cracking and pitting.
Duplex 2304 screws are specified for bridges, pedestrian walkways, and architectural facades exposed to urban or coastal atmospheres, providing long-term durability and aesthetic performance.

Duplex 2304 Screws Standards & International Certifications

Duplex 2304 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2304 Screws — 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
Email Us

Answers for Buyers

Duplex 2304 Screws — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2304 Screws 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 screws selection and pricing.
Duplex 2304 socket head screws are available to DIN 912 (metric), ISO 4762, DIN 7991 (countersunk), and ASME B18.3 (inch). Button head and flat head types are also available. Custom thread forms (UNC, UNF, BSW) can be supplied on request with short lead times.
Use molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8014) to prevent galling and facilitate disassembly. Avoid copper-based anti-seize in chloride environments. Lubricated torque values should be reduced by 15-20% compared to dry assembly.
Yes – Duplex 2304 screws offer significantly better resistance to pitting and crevice corrosion in seawater and brine than 316L, making them suitable for marine, desalination, and offshore applications. For continuous immersion in highly aggressive brines, consider higher alloy duplex grades.
No formal MOQ for standard sizes (M6-M24) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes or non-standard threads may require a 10 kg minimum. Quantity 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