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Duplex 2205 Screws Manufacturer & Exporter in India

Explore Duplex 2205 Screws 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 Screws?

Duplex 2205 screws are high-strength, corrosion-resistant fasteners manufactured from duplex stainless steel UNS S32205/S31803, conforming to ASTM A479 and ASTM A276. The duplex microstructure (roughly 50% ferrite, 50% austenite) provides a unique combination of high mechanical strength and excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion.

Duplex 2205 screws are widely specified for bolted joints in marine, chemical, and oil & gas environments where standard austenitic stainless steels (like 316L) are prone to failure. Their PREN of 34-36 ensures reliable performance in aggressive chloride-bearing atmospheres, making them the preferred choice for critical structural and pressure-retaining applications.

Quick Specifications

MaterialDuplex Stainless Steel 2205
UNS NumberS32205 / S31803
DIN Number1.4462
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 30 HRC / 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 Washers, 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 Washers
Duplex 2205 Studs
Duplex 2205 Threaded Rods

Technical Data

Duplex 2205 Screws Dimensions, Sizes & Thread Standards

Duplex 2205 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (hex socket cap), DIN 7991 (countersunk), ISO 4762 (hex socket head). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3. All Duplex 2205 screws dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Socket 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 912Hex socket cap screwsMetric
DIN 7991Countersunk socket screwsMetric
ISO 4762Hex socket head screwsMetric
ASME B18.3Socket cap, flat, button headUNC/UNF
ISO 14581Torx countersunk screwsMetric
ISO 7380Button head socket screwsMetric
Material StandardRequirement
ASTM A479Bar/rod - UNS S32205/S31803
ASTM A276Forged/rolled bar
ASTM F836Mechanical properties
NACE MR0175Sour service =30 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2205 Chemical Composition

Duplex 2205 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)21.0-23.0%
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
Sulfur (S)0.02% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. Ferrite content (40-60%) certified on request.

Why Duplex 2205 Alloy Composition Matters for Screws

Cr (21–23%) + Mo (2.5–3.5%) — Pitting & Crevice Resistance
The high chromium and molybdenum content gives Duplex 2205 screws a PREN of 34–36, ensuring superior resistance to pitting and crevice corrosion in seawater, brine, and chloride-rich process streams.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen increases yield strength and enhances resistance to chloride stress corrosion cracking, making Duplex 2205 screws ideal for high-pressure and cyclic loading environments.
Balanced Ferrite-Austenite Structure
The duplex microstructure (40–60% ferrite) provides double the strength of 316L and prevents intergranular corrosion after welding or hot assembly.

Fastener Performance

Duplex 2205 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2205 Screws per ASTM. Duplex 2205 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)
M61298.5
M8302414.5
M10604823.5
M121058434.5
M1626020859.0
M2051040892.0
M24880704133.0
M3017001360210.0
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.15. Avoid stainless-on-stainless galling by using proper lubrication.

Industry Applications

Duplex 2205 Screws Applications — Industries & End Uses

Duplex 2205 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 2205 screws are widely used in seawater reverse osmosis (SWRO) plants, brine concentrators, and water treatment skids for pump housings, filter vessels, and structural assemblies exposed to high chloride concentrations and cyclic loading.
Socket cap and countersunk screws for shipbuilding, offshore platform walkways, handrails, and splash-zone equipment where resistance to pitting, crevice corrosion, and stress corrosion cracking is essential for long-term reliability.
Fasteners for chemical reactors, pulp digesters, and bleach plant equipment where exposure to organic acids, chlorides, and oxidizing media demands superior corrosion resistance and mechanical strength.
Duplex 2205 screws are specified for pressure vessel closures, heat exchanger channel covers, and pipeline supports in sour gas, produced water, and hydrocarbon processing environments. NACE MR0175 compliant for H2S service.

Duplex 2205 Screws Standards & International Certifications

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

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

Duplex 2205 Screws — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2205 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 2205 screws selection and pricing.
Duplex 2205 socket cap screws are available to DIN 912 (metric), ISO 4762, DIN 7991 (countersunk), and ASME B18.3 (inch series). Button head and Torx drive screws are also available per ISO 7380 and ISO 14581. 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 20% compared to dry assembly.
Yes – Duplex 2205 screws have a PREN of 34-36 and are highly resistant to pitting and crevice corrosion in seawater, brine, and chloride-rich environments. They are widely used in desalination, marine, and offshore applications without the need for additional coatings.
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 typically require a 10 kg minimum. Quantity price breaks are available 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