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Inox Steel India is a manufacturer, supplier, and exporter of marine and offshore grade hex bars, supplying corrosion-resistant hexagonal bar stock for seawater-exposed, chloride-rich, and offshore operating environments across India, GCC countries, the Middle East, Africa, Europe, and the Americas.
Hex bars used in marine and offshore applications are selected for high corrosion resistance, mechanical strength, and long-term reliability under aggressive service conditions. Duplex stainless steel and SS 316L hex bars are widely used for marine hardware, offshore fittings, fasteners, connectors, and structural components.
Inox Steel India supplies marine-grade hex bars in Duplex Stainless Steel (S31803 / S32205) and Stainless Steel 316 / 316L, manufactured and processed in compliance with ASTM A276 / ASTM A479 and other applicable international standards.
🔍 What Are Marine & Offshore Grade Hex Bars?
Marine and offshore grade hex bars are solid hexagonal bars manufactured from corrosion-resistant stainless steel and duplex alloys, designed to perform in seawater, coastal, offshore, and high-humidity environments.
Compared to standard stainless steel grades, Duplex stainless steel offers higher strength and superior resistance to pitting, crevice corrosion, and stress corrosion cracking, while SS 316L provides excellent general corrosion resistance with good weldability.
These hex bars are typically supplied in solution-annealed condition to ensure optimal corrosion resistance and mechanical properties.
Hex bars are converted into marine and offshore components through machining and forging operations, followed by inspection and assembly.
Typical Processing Route:
1️⃣ Grade Selection (Duplex / SS 316L)
Based on chloride exposure, strength requirement, and service life.
2️⃣ Machining / Forging
Hex bars are machined or forged into required marine components.
3️⃣ Solution Annealing
Ensures corrosion resistance and phase balance (for duplex grades).
4️⃣ Surface Finishing
Pickling, passivation, or machining finish as required.
5️⃣ Inspection & Certification
Chemical, mechanical, and PMI checks prior to dispatch.
✅ Key Characteristics of Marine & Offshore Hex Bars
These characteristics ensure durability, safety, and reduced maintenance in marine and offshore installations.
Hex bars for marine and offshore applications are commonly supplied in:
Material selection depends on chloride concentration, operating temperature, and mechanical load.
🧭 Key Factors to Consider When Selecting Marine & Offshore Hex Bars
When selecting hex bars for marine or offshore use, the following parameters should be evaluated:
1️⃣ Corrosion Resistance Requirement (PREN value)
2️⃣ Mechanical Strength and Load Conditions
3️⃣ Weldability and Fabrication Method
4️⃣ Applicable Marine / Offshore Standards
5️⃣ Inspection and Certification Requirements
Correct selection ensures safe and reliable performance in harsh marine environments.
In India, marine and offshore grade hex bars are widely used by shipyards, offshore fabricators, coastal infrastructure projects, and marine equipment manufacturers, particularly for ports, jetties, offshore platforms, and marine fasteners.
Export demand is driven by offshore oil & gas, marine engineering, and coastal infrastructure projects requiring high-integrity corrosion-resistant materials.
⚙ Applications and Technical Specifications
Marine- and offshore-grade hex bars supplied by Inox Steel India are engineered for chloride-rich, seawater-exposed, and offshore operating conditions where corrosion resistance, mechanical strength, and service reliability are critical. Duplex stainless steel and SS 316L hex bars are selected based on environment severity, load conditions, and lifecycle requirements.
🧩 Applications by Component Type
Marine Fasteners & Hardware
Service Use: Continuous exposure to seawater and salt spray.
Typical Applications: Nuts, bolts, studs, anchors, deck fittings.
Industry Sectors: Shipbuilding | Marine Hardware | Coastal Infrastructure
Offshore & Subsea Fittings
Service Use: High corrosion resistance under pressure and cyclic loading.
Typical Applications: Connectors, adapters, couplings, clamps.
Industry Sectors: Offshore Oil & Gas | Subsea Engineering
Structural & Equipment Components
Service Use: Strength and durability in aggressive marine atmospheres.
Typical Applications: Brackets, supports, frames, equipment mounts.
Industry Sectors: Offshore Platforms | Marine Equipment | Energy
Hex bars for marine and offshore applications are supplied to controlled tolerances suitable for machining and assembly.
(Refer to standard hex bar sizes in mm PDF and hex bar size chart in mm India for nominal AF dimensions.)
⚖ Weight Basis (Indicative)
Weights are calculated on nominal AF size and material density.
| AF Size (mm) | Approx. Weight (kg/m) |
|---|---|
| 10 | 0.68 |
| 16 | 1.74 |
| 20 | 2.72 |
| 25 | 4.25 |
| 30 | 6.11 |
| 40 | 10.86 |
Indicative values; actual weight varies by grade and finish.
Pricing depends on:
Marine and offshore grades typically carry a premium due to alloy content and inspection requirements.
🔢 HSN / HS Code
HSN Code: 7222
(For stainless steel bars and rods)
🧪 Testing & Quality Inspection
Marine & offshore hex bars are inspected for corrosion resistance and service integrity.
Testing includes:
Material can be supplied with EN 10204 3.1 / 3.2 certification on request.
Inox Steel India supplies marine- and offshore-grade hex bars with controlled metallurgy, verified corrosion resistance, and application-specific processing for long-term service in aggressive environments. Production, heat treatment, and inspections are aligned to offshore and marine standards to ensure reliability and traceability.
Key supply features:
🧩 Industries Served
Marine & offshore grade hex bars are supplied to:
Material selection is aligned with chloride exposure, pressure, temperature, and lifecycle requirements.
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. Are these hex bars suitable for seawater immersion?
Is ferrite content controlled for duplex grades?
Are custom cut lengths available for offshore projects?
Is certification maintained after cutting and finishing?