What is Ferralium 255?

Ferralium 255 (UNS S32550, EN 1.4507, X2CrNiMoCuN25-6-3) is a Cu-bearing super duplex stainless steel with nominal composition 25Cr-5Ni-3Mo-2Cu-0.2N. PREN >= 40, balanced austenite-ferrite microstructure (35-55% ferrite per NORSOK M-630), supplied solution-annealed (no precipitation hardening). Critical Pitting Temperature >= 35 °C per ASTM G48 method A. Used in seawater service, oil & gas downhole, subsea, desalination and chemical processing. Ferralium is a registered trademark of Langley Alloys.

How does Ferralium 255 chemical composition differ from Duplex 2205 chemical composition?

Ferralium 255 (UNS S32550) chemistry: Cr 24-27%, Ni 4.5-6.5%, Mo 2.9-3.9%, Cu 1.5-2.5%, N 0.10-0.25%, balance Fe. Duplex 2205 (UNS S31803/S32205) chemistry: Cr 21-23%, Ni 4.5-6.5%, Mo 2.5-3.5%, N 0.08-0.20%, no Cu. Ferralium 255 has higher Cr, higher Mo, higher N, plus 2% Cu — pushing PREN from ~35 (Duplex 2205) to ~40+ (super duplex threshold).

What is PREN and why is Ferralium 255 super duplex?

PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3 · %Mo + 16 · %N. With nominal 25 Cr, 3 Mo, 0.2 N, Ferralium 255 PREN = 25 + 9.9 + 3.2 = 38.1 minimum, typically 40-42 per heat. PREN >= 40 is the threshold defining super duplex stainless steel grades, distinguishing Ferralium 255 from standard duplex grades like Duplex 2205 (PREN ~35).

What super duplex stainless steel grades exist alongside Ferralium 255?

The commercially significant super duplex stainless steel grades are: Ferralium 255 (UNS S32550, Cu-bearing, EN 1.4507), Super Duplex 2507 (UNS S32750, no Cu, EN 1.4410, slightly higher Cr/Mo), and Zeron 100 (UNS S32760, W-bearing, EN 1.4501). All have PREN >= 40. Standard duplex grades like Duplex 2205 (UNS S31803/S32205, EN 1.4462, PREN ~35) sit below the super duplex threshold.

Which super duplex stainless steel ASTM grades cover Ferralium 255?

ASTM A479 (bar/billet/shapes), ASTM A789 (seamless/welded tube), ASTM A790 (seamless/welded pipe), ASTM A815 (wrought fittings), ASTM A182 (forged flanges/fittings/valves), ASTM A276 (bars/shapes alternative). All under UNS S32550 designation. EN equivalents: EN 10088-3, EN 10222-5, EN 10272.

Is Ferralium 255 NORSOK M-650 qualified?

Ferralium 255 can be supplied with NORSOK M-650 Qualification Test Records (QTR) demonstrating manufacturer qualification per NORSOK M-630 material data sheet MDS D55. The QTR documents heat treatment, ferrite content (35-55% base, 35-65% weld), Charpy >= 45 J at -46 °C, Critical Pitting Temperature per ASTM G48 method A, and microstructural verification. Required for North Sea, Norway and high-criticality offshore projects.

Is Ferralium 255 NACE MR0175 / ISO 15156 compliant for sour service?

Yes. Ferralium 255 is qualified under NACE MR0175 / ISO 15156-3 for sour service when supplied solution-annealed with hardness <= 32 HRC and ferrite content 35-55% per NORSOK M-630. TorqBolt provides per-heat MTC (EN 10204 type 3.2) certifying NACE MR0175 compliance for downhole, wellhead and sour-gas applications.

Where can I buy Ferralium 255 in India?

TorqBolt Pvt Ltd manufactures Ferralium 255 at facilities in Mumbai and Rajkot, India. Bar, plate, sheet, pipe, tube, fittings, flanges, forgings, hex bolts, stud bolts, hex nuts and threaded rod available with per-heat MTC (EN 10204 type 3.2) and optional NORSOK M-650 QTR + NACE MR0175 documentation. Contact info@torqbolt.com or +91-22-66157017.

Ferralium 255 Supplier in India: TorqBolt Mumbai and Rajkot

Name: Ferralium 255 (UNS S32550), Cu-bearing Super Duplex Stainless Steel
Brand: TorqBolt

Ferralium 255 Supplier in India, TorqBolt Mumbai & Rajkot

TorqBolt Pvt Ltd manufactures Ferralium 255 (UNS S32550) components and fasteners at our facilities in Mumbai and Rajkot, India. The Indian super duplex stainless steel market is the second-largest in the world by search volume after the United States, driven by domestic oil & gas EPC contractors, refining and petrochemical projects, desalination construction, and export work for Middle East, Southeast Asia and African end-users.

Ferralium 255 Product Range Available in India

Bar, round bar (6–600 mm), hex bar, square bar, flat bar, forged bar, cold-finished bar, hollow bar (ASTM A479 / A276)

Plate / sheet, hot-rolled plate, cold-rolled sheet (ASTM A240, EN 10088-2)

Pipe / tube, seamless and welded pipe (ASTM A790), seamless and welded tube (ASTM A789)

Fittings & flanges, wrought fittings (ASTM A815), forged flanges (ASTM A182)

Forgings, open-die and closed-die forgings (ASTM A182, EN 10222-5)

Fasteners, hex bolts, stud bolts (ASTM A193 S6), hex nuts (ASTM A479 / B18.2.2), flat washers (ASTM A479 / B18.22.1), threaded rod, socket-head cap screws (DIN 912)

Why TorqBolt for Ferralium 255 in India

NORSOK M-650 capable manufacturer with QTR available on request for North Sea / Norway offshore projects

NACE MR0175 / ISO 15156-3 compliance certified per heat for sour-service applications

ISO 9001:2015 quality management system

Per-heat EN 10204 type 3.2 MTC with chemistry, mechanicals, ferrite content per ASTM E562, PREN calculation

India-domestic delivery anywhere in India (Mumbai, Pune, Vadodara, Ahmedabad, Chennai, Hyderabad, Bangalore, Kolkata, Delhi-NCR, Visakhapatnam, Gurugram, Coimbatore)

Export-ready packing and documentation for Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait), Southeast Asia (Singapore, Malaysia, Indonesia), and African destinations

INR / USD pricing options; payment terms negotiable

Indian Industries Served

Oil & gas EPC, ONGC, Reliance Industries, Indian Oil, BPCL, HPCL, Hindustan Petroleum, GAIL, Petronet LNG project supply chains

Refining & petrochemical, Mangalore Refinery, Jamnagar refinery complex, Paradip refinery, Numaligarh, Visakh refinery

Desalination, Tamil Nadu, Gujarat, Maharashtra coastal desalination plant construction

Marine / offshore, Indian shipyard supply, offshore platform fabrication for Bombay High and KG basin

Chemical processing, Indian chemical plant fabrication for chlor-alkali, urea, phosphate fertilizer, specialty chemicals

Contact for Ferralium 255 Supply in India

TorqBolt Pvt Ltd
Mumbai office & Rajkot manufacturing facility, India
Phone: +91-22-66157017
Email: info@torqbolt.com
WhatsApp: +91-22-66157017

Passivation (ASTM A967)
Pickling (ASTM A380)
Electropolishing
Mill / 2B / 2D / BA finish
Bright bar / centreless ground
Peeled & polished bar
Shot-blast (EN 10088-2)

ISO 9001:2015
NORSOK M-650
NACE MR0175
ISO 15156-3
PED 2014/68/EC
EN 10204 type 3.2
AD 2000 W2/W7/W10

Ferralium 255 Supplier in India, TorqBolt Mumbai & Rajkot

Ferralium 255 Product Range Available in India

Why TorqBolt for Ferralium 255 in India

Indian Industries Served

Contact for Ferralium 255 Supply in India

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