Offshore Oil & Gas Nickel Alloy Solutions

Why findsteel for Offshore Projects?

We specialize in nickel alloys and super stainless steels for offshore platforms, FPSOs, subsea manifolds, and LNG facilities. Our focus:

Heat exchanger tubesheets, tubes, and plates in C-276, C-22, Alloy 825, Inconel 625
Seawater cooling systems in 254SMO, 904L, AL-6XN
LNG cryogenic service in Alloy 825, Monel 400
Small batch emergency stock — next-day air freight available

Application-Specific Materials

Seawater Cooling Systems

Heat exchangers, pumps, valves in chloride-rich seawater

254SMO (S31254) — PREN 43+, best for ambient seawater
904L (N08904) — Cost-effective alternative, PREN 34
AL-6XN (N08367) — Superior to 254SMO in hot seawater
C-276 (N10276) — For aggressive chloride + H2S + CO2

LNG / Cryogenic Service

Main cryogenic heat exchanger (MCHE) and LNG piping

Alloy 825 (N08825) — Standard for LNG MCHE tubes
Monel 400 (N04400) — LNG storage tanks, cryogenic valves
Inconel 625 (N06625) — High-pressure LNG manifolds

Subsea Piping & Manifolds

Deepwater flowlines, risers, subsea tie-backs

Inconel 625 (N06625) — Clad pipe, forgings, fittings
C-276 (N10276) — Aggressive HPHT wells with H2S
Duplex 2205 (S32205) — Structural, manifolds, supports
Super Duplex 2507 (S32750) — Higher strength subsea

Platform Utilities

Firewater, utility water, process piping

Duplex 2205 (S32205) — Standard platform utility piping
316L (S31603) — Low-chloride utility systems
254SMO — High-chloride firewater systems

Material Selection Guide

Application	Material	UNS	PREN	Key Advantage
Ambient seawater HX	254SMO	S31254	43	Best pitting resistance in cold seawater
Hot seawater cooling	AL-6XN	N08367	46	Superior at 40-80C
Aggressive chloride + H2S	Hastelloy C-276	N10276	69	Handles multi-acid + H2S
LNG MCHE tubes	Alloy 825	N08825	31	Standard for cryogenic service
LNG storage	Monel 400	N04400	—	Excellent at -196C
Subsea manifolds	Inconel 625	N06625	41	High strength + corrosion
Platform structural	Duplex 2205	S32205	34	2x strength of 316L

Emergency Stock — Small Batch Next-Day Air

Unlike large suppliers who require 5+ ton minimums, we stock small batches (100-500 kg) for urgent offshore repairs and platform maintenance. Air freight to Middle East / SE Asia in 24-48 hours.

In Stock Now

C-276 plate 3-12mm x 2000x6000mm
254SMO sheet 2-6mm x 1500x3000mm
Alloy 825 seamless tube 1/2" - 2" SCH40
Inconel 625 round bar 20-100mm dia
Monel 400 plate 6-20mm

Lead Times

Stock: Ship in 24 hours
Non-stock: 15-25 days
Custom sizes: 30-45 days

Reference Projects

Saudi Aramco Marjan: C-276 tubesheets, 254SMO plates for seawater HX (2025-2026)
Qatargas LNG Train 7: Alloy 825 tubes, Monel 400 plate for MCHE components (2025)
Petronas FLNG: Inconel 625 forgings, C-276 fittings for subsea tie-back (2024)
ADNOP offshore: Duplex 2205 pipe, Super Duplex 2507 fittings (2024-2025)