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Duplex & Nickel Alloy Components
Inox Steel India is a trusted manufacturer, supplier, and exporter of forged and machined marine and offshore components, supplying duplex stainless steel and nickel alloy components for shipbuilding, offshore platforms, subsea systems, and marine infrastructure projects across India, GCC, Middle East, Africa, Europe, and the Americas.
Marine and offshore environments are among the most aggressive service conditions, characterized by continuous seawater exposure, high chloride concentration, cyclic loading, pressure fluctuations, and in many cases sour service conditions. These demanding conditions require materials with exceptional corrosion resistance, high strength, and long-term reliability.
At Inox Steel India, marine and offshore components are manufactured using controlled forging and solution annealing, followed by precision machining, fully aligned with ASTM, ASME, EN, NACE, and project-specific offshore standards.
Marine and offshore components are structural, pressure-retaining, and load-bearing parts used in equipment and systems operating in seawater and offshore environments.
Typical components include:
These components must withstand:
Forged construction ensures directional grain flow, superior toughness, and resistance to fatigue and cracking.
Marine environments demand materials that offer both high strength and exceptional corrosion resistance.
🔹 Duplex & Super Duplex Stainless Steels (S31803 / S32750 / S32760)
Used extensively in offshore and subsea systems, offering:
🔹 Nickel Alloys (Inconel 625 / Monel 400)
Used for severe offshore and subsea service, offering:
Duplex & Nickel Alloy Components
Manufacturer, Supplier & Exporter – Inox Steel India
| Parameter | Marine & Offshore Components |
|---|---|
| Product Type | Forged & Machined Marine / Offshore Components |
| Typical Products | Shafts · Flanges · Connectors · Valve Bodies · Structural Forgings · Subsea Components |
| Manufacturing Process | Open Die Forging / Closed Die Forging → Heat Treatment → Rough / Finish Machining |
| Applicable Duplex Grades | ASTM A182 F51 (S31803) · F53 (S32750) · F55 (S32760) |
| Applicable Nickel Alloy Grades | Inconel 625 · Monel 400 · Hastelloy (project specific) |
| Material Category | Duplex Stainless Steel · Super Duplex Stainless Steel · Nickel Alloys |
| Applicable Standards | ASTM · ASME · EN |
| Marine / Offshore Codes | NACE MR0175 / ISO 15156 · DNV · ABS (project dependent) |
| Supply Condition | Solution Annealed · Water Quenched |
| Operating Environment | Seawater · Chloride-Rich · Sour Service · High Pressure |
| Temperature Service Range | Sub-zero to Moderate High Temperature |
| Dimensional Range | As per drawing / project specification |
| Machining Scope | CNC Turning · Milling · Boring · Drilling |
| Heat Treatment Options | Solution Annealing · Stress Relieving |
| Testing Performed | UT · MPI · PMI · Mechanical Tests |
| Inspection Standard | ASTM · ASME · EN · NACE |
| Certification | EN 10204 3.1 / 3.2 |
| Typical End Use | Offshore Platforms · Marine Equipment · Subsea Systems |
| HS / HSN Code | 7228 / 7507 (material & component dependent) |
📌 This Master Datasheet applies to all Marine & Offshore components supplied by Inox Steel India in Duplex and Nickel Alloy grades.
In India, marine and offshore components are widely used in shipyards, offshore platforms, ports, and coastal infrastructure projects, particularly around Mumbai, Gujarat coast, Chennai, Kochi, and Visakhapatnam.
Inox Steel India supports these projects with export dispatch via JNPT, Mundra, and Hazira ports.
Marine & Offshore components supplied by Inox Steel India are engineered for continuous seawater exposure, high chloride concentration, pressure loading, and cyclic mechanical stress, where material selection, forging integrity, and corrosion resistance are critical to long-term reliability. Each component is manufactured based on offshore design conditions, corrosion allowance, and classification requirements, ensuring dependable performance in harsh environments.
Inox Steel India manufactures and supplies a wide range of forged and machined marine & offshore components, including:
All components are manufactured strictly as per approved drawings and offshore project specifications.
Service Conditions: Continuous seawater exposure | High chloride and offshore atmosphere | Moderate to high pressure
Typical Applications:
Service Conditions: Severe corrosion and sour service | High pressure subsea environments | Cyclic and fatigue-critical service
Typical Applications:
| Component | Capability |
|---|---|
| Shafts & Bars | Small to heavy sections |
| Flanges & Connectors | Offshore pressure ratings |
| Valve Bodies | Machined from solid forgings |
| Structural Forgings | Drawing-based |
| Machining Tolerance | Offshore / client specified |
Heavy-section forgings and precision machining are available for offshore-class components.
Pricing is project-specific and depends on:
Forged duplex and nickel alloy components provide superior lifecycle value by reducing corrosion-related failures and maintenance costs.
All marine & offshore components are supplied after stringent inspection suitable for offshore service.
Third-Party Inspection:
All materials are supplied with EN 10204 3.1 / 3.2 certification and full traceability.
Ports of Dispatch: JNPT (Mumbai) · Mundra · Hazira
Inox Steel India is a trusted manufacturer, supplier, and exporter of forged and machined marine & offshore components, delivering high-integrity duplex and nickel alloy solutions designed for seawater, offshore, and subsea environments.
Our key strengths include:
We focus on supplying corrosion-resistant, long-life components that minimize downtime and maintenance in harsh marine environments.
| Industry | Application | Preferred Grade |
|---|---|---|
| Offshore Oil & Gas | Subsea connectors & hubs | Super Duplex / Inconel 625 |
| Marine Engineering | Shafts & fittings | Duplex / Monel 400 |
| Shipbuilding | Structural & valve components | Duplex Stainless Steel |
| Desalination Plants | Seawater systems | Duplex / Super Duplex |
| Offshore Wind Energy | Structural & fastening parts | Duplex |
| EPC Offshore Projects | Custom forged components | Duplex / Nickel Alloy |
Regular Export Destinations: UAE · Saudi Arabia · Qatar · Oman · Norway · UK · Netherlands · USA · Brazil · Australia
Whether your requirement is duplex stainless steel offshore components,
nickel alloy subsea parts, or
custom forged marine components,
our technical team will support you from material selection to final delivery.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in, steel@inoxsteelindia.in
+91 9930796690
Yes. Duplex and SS 316L are widely used for seawater and marine atmospheric exposure when properly specified and processed.
Yes, ferrite content testing can be provided on request to ensure phase balance.
Yes, custom cut lengths are supplied to improve fabrication and machining efficiency.
Yes, heat number traceability and EN 10204 certification are maintained.
Inox Steel India is a leading manufacturer & exporter of Marine & Offshore Components in Duplex, Super Duplex & Nickel Alloys. Supplying corrosion-resistant forged components for offshore, subsea & marine projects worldwide.