+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

Ferralium 255 Threaded Rods Manufacturer & Exporter in India

Explore Ferralium 255 Threaded Rods Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are Ferralium 255 Threaded Rods?

Ferralium 255 threaded rods are high-performance duplex stainless steel fasteners manufactured from UNS S32550 bar stock, conforming to ASTM A276 and ASTM A479. This super duplex alloy contains 25% chromium, 5% nickel, 3.5% copper, and 2% molybdenum, delivering exceptional resistance to pitting, crevice, and stress corrosion cracking in aggressive chloride and acidic environments.

With a PREN (Pitting Resistance Equivalent Number) of 40+, Ferralium 255 threaded rods are specified for critical bolted joints in seawater, desalination, chemical processing, and FGD systems. Their high strength (minimum 800 MPa tensile) allows for reduced rod diameter and weight in structural and pressure-retaining applications compared to standard austenitic stainless steels.

Quick Specifications

MaterialFerralium 255 (Super Duplex Stainless Steel)
UNS NumberS32550
DIN Number1.4507
Material StandardASTM A276 / ASTM A479
Rod Standard (Metric)DIN 975 / DIN 976
Rod Standard (Inch)ASME B18.31.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength800 MPa (116 ksi) min
Yield Strength570 MPa (83 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 Ferralium 255 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Ferralium 255 fastener range from certified super duplex stainless steel bar stock, including Ferralium 255 Bolts, Ferralium 255 Nuts, Ferralium 255 Screws, Ferralium 255 Washers, and Ferralium 255 Studs. All Ferralium 255 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Ferralium 255 Bolts
Ferralium 255 Nuts
Ferralium 255 Screws
Ferralium 255 Washers
Ferralium 255 Studs

Technical Data

Ferralium 255 Threaded Rods Dimensions, Sizes & Thread Standards

Ferralium 255 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full thread) / DIN 976 (studs) / ASME B18.31.3. Custom lengths up to 6 meters. Inch and metric threads available. All Ferralium 255 threaded rods dimensions are verified against applicable DIN, ISO, and

Threaded Rod Dimensions - Metric (DIN 975)

Size (M)Pitch (mm)Core Dia (mm)Length (mm)Thread Type
M61.04.8100-2000Full
M81.256.6100-3000Full
M101.58.2100-3000Full
M121.759.9100-3000Full
M162.013.6100-3000Full
M202.517.1100-3000Full
M243.020.7100-3000Full
M303.526.1100-3000Full
M364.031.6100-3000Full
M424.537.1100-3000Full
M485.042.6100-3000Full
M565.549.1100-3000Full
M646.055.0100-3000Full

Dimensional & Material Standards

StandardCoversThread
DIN 975Threaded rods, full threadMetric
DIN 976Stud bolts, double endMetric
ASME B18.31.3Threaded rods, inchUNC/UNF
ISO 898-1Mechanical propertiesMetric
ASME B1.1Unified threadsUNC/UNF
Material StandardRequirement
ASTM A276Bar/rod - UNS S32550
ASTM A479Pressure vessel rod
NACE MR0175Sour service =290 HB
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Ferralium 255 Chemical Composition

Ferralium 255 Threaded Rods are manufactured from a high-alloy ferritic-austenitic steel containing chromium (24–26%), molybdenum (3.5–5%), and nitrogen (0.24–0.32%) per ASTM. These precise elemental limits produce PREN ≥ 40 — confirming seawater pitting immunity — and deliver the 550 MPa minimum yield strength required for NORSOK M-630 subsea qualification.

Chemical Composition per ASTM A276 / UNS S32550

ElementComposition (%)
Chromium (Cr)24.0-26.0%
Nickel (Ni)4.5-6.5%
Molybdenum (Mo)1.5-2.0%
Copper (Cu)1.5-2.5%
Nitrogen (N)0.10-0.25%
Silicon (Si)1.0% max
Manganese (Mn)1.5% max
Carbon (C)0.04% max
Phosphorus (P)0.04% max
Sulphur (S)0.03% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content available on request.

Why Ferralium 255 Alloy Composition Matters for Threaded Rods

Cr (24–26%) & Mo (1.5–2.0%) — Pitting & Crevice Resistance
The high chromium and molybdenum content gives Ferralium 255 threaded rods a PREN of 40+, ensuring outstanding resistance to pitting and crevice corrosion in seawater, brine, and aggressive chemical environments.
Cu (1.5–2.5%) — Acid & Chloride Resistance
Copper enhances resistance to sulphuric, phosphoric, and organic acids, making Ferralium 255 ideal for threaded rods in chemical process and FGD applications.
Duplex Structure — High Strength & SCC Resistance
The duplex microstructure provides high yield strength and excellent resistance to chloride stress corrosion cracking, outperforming standard 316/904L rods in critical bolted joints.

Fastener Performance

Ferralium 255 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Ferralium 255 Threaded Rods per ASTM. Ferralium 255 threaded rods achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121108838
M1627021677
M20540432120
M24950760173
M3019001520270
M3633002640390
M4252004160560
M4877006160760
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.15. Avoid copper-based anti-seize on duplex stainless steel.

Industry Applications

Ferralium 255 Threaded Rods Applications — Industries & End Uses

Ferralium 255 Threaded Rods from RealBolt are specified across subsea oil and gas, FPSOs, desalination, and offshore where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Ferralium 255 threaded rods are widely used in seawater reverse osmosis (SWRO) plants, brine concentrators, and evaporators for flange joints, pipe supports, and structural assemblies exposed to high chloride and brine environments.
Full thread rods for splash zone structures, riser clamps, and deck equipment where high strength and resistance to pitting and crevice corrosion are critical for long-term durability in seawater immersion.
Threaded rods for acid storage tank nozzles, heat exchanger tie rods, and reactor closures in phosphoric, sulphuric, and nitric acid service, where standard stainless steels fail due to localised corrosion.
Ferralium 255 rods are specified for absorber tower internals, ductwork flanges, and support structures in FGD scrubbers, offering superior resistance to acidic condensates and chloride-laden environments.

Ferralium 255 Threaded Rods Standards & International Certifications

Ferralium 255 Threaded Rods 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 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Ferralium 255 Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Ferralium 255 Threaded Rods — 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

Ferralium 255 Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about Ferralium 255 Threaded Rods from RealBolt — covering PREN ≥ 40, NORSOK M-630, NACE MR0175, ASTM A182 F53/F55, sizes, and EN 10204 3.2 third-party documentation. Contact our technical team directly for project-specific guidance on Ferralium 255 threaded rods selection and pricing.
Ferralium 255 threaded rods are available to DIN 975 (metric full thread), DIN 976 (studs), ASME B18.31.3 (inch), and ISO 898-1 for mechanical properties. Both metric (M6-M64) and inch (¼”-2½”) threads are supplied. Custom thread forms (BSW, BSF, Whitworth, ACME) can be manufactured on request with short lead times.
Molybdenum-based or PTFE anti-seize is recommended for Ferralium 255 threaded rods to prevent galling and facilitate disassembly. Avoid copper-based anti-seize, as it can promote galvanic corrosion in chloride environments. Apply to threads and nut faces; reduce torque by 20% for lubricated assembly.
Yes – Ferralium 255 offers a PREN of 40+ and is highly resistant to pitting, crevice, and stress corrosion cracking in seawater, brine, and desalination plant environments. It is specified in NORSOK MDS D55 and is widely used in SWRO, marine, and offshore applications without the need for additional coatings.
No MOQ for standard sizes (M10-M36) held in stock – single rods can be supplied for urgent maintenance. Custom diameters and cut lengths have a 10 kg minimum. Price breaks are available at 25, 100, and 250 rods. Full traceability and MTCs provided for all orders.

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