Introduction to A182 F53: A high-performance stainless steel for marine applications
As a manufacturer with decades of experience supplying stainless steel fittings and flanges, we’ve seen first-hand how the choice of material can make or break a project in harsh marine environments. One alloy that stands out for demanding offshore and subsea service is A182 F53 duplex stainless steel.
At Haihao Group, we produce forged A182 F53 flanges, pipe fittings, and special components that help customers manage corrosion, mechanical stress, and long-term reliability.
What Makes A182 F53 an Ideal Marine-Grade Alloy?
A182 F53 is a super duplex stainless steel, UNS S32750. It combines austenitic and ferritic microstructures, delivering outstanding properties:
- Excellent Chloride Resistance
Thanks to its high chromium (around 25%) and molybdenum (3.6%) content, F53 offers excellent resistance to pitting and crevice corrosion in seawater. - Superior Strength
Compared to standard austenitic stainless steels, it delivers nearly twice the yield strength, allowing lighter wall thickness in many designs. - Good Weldability
With careful heat input control, A182 F53 components can be welded without significant loss of corrosion resistance or toughness.
These characteristics make it a preferred option in offshore oil and gas platforms, seawater desalination systems, and subsea processing equipment.
ASME B16.9 ASTM A815 UNS S32750 seamless LR 90 degree elbow for marine industry
Chemical Composition of A182 F53
The chemical composition of A182 F53 is carefully balanced to enhance its corrosion resistance and mechanical properties:
| Element | Composition (%) |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.20 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Silicon (Si) | ≤ 0.80 |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
| Copper (Cu) | ≤ 0.50 |
| Iron (Fe) | Balance |
This composition provides exceptional resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion, which are common challenges in marine and offshore environments.
Mechanical Properties of A182 F53
The mechanical properties of A182 F53 make it stronger and tougher than standard austenitic stainless steels:
| Property | Value |
| Tensile Strength | ≥ 795 MPa |
| Yield Strength (0.2% offset) | ≥ 550 MPa |
| Elongation | ≥ 15% |
| Hardness (Brinell) | ≤ 310 HB |
These properties allow A182 F53 to withstand high-pressure environments and resist mechanical wear, making it ideal for offshore and subsea applications.
Our Manufacturing and Inspection Process
Producing A182 F53 components involves several critical stages to ensure the material’s potential is fully achieved:
1️⃣ Forging
Each flange or fitting begins with a high-integrity forging billet sourced from qualified mills. Forging refines the grain structure, enhancing mechanical strength.
2️⃣ Heat Treatment
Solution annealing is performed at controlled temperatures to dissolve detrimental phases and optimize corrosion performance.
3️⃣ Machining
We machine sealing surfaces, bores, and threads in CNC lathes to ASME B16.5 and B16.9 tolerances.
4️⃣ Non-Destructive Testing
All critical dimensions and surfaces are inspected visually and with calibrated instruments. We also perform:
Ultrasonic testing (UT)
Dye penetrant testing (PT)
Positive material identification (PMI)
5️⃣ Certification
Each batch is delivered with full documentation:
EN 10204 3.1 certificates
Dimensional inspection records
Optional NACE MR0175 compliance statement
Why is A182 F53 Ideal for Marine Environments?
1.Superior Corrosion Resistance
The high chromium (Cr), molybdenum (Mo), and nitrogen (N) content significantly improves resistance to pitting and crevice corrosion in seawater and chloride-rich environments.
Unlike traditional austenitic stainless steels, A182 F53 has a lower risk of stress corrosion cracking (SCC), which is critical in high-salinity marine conditions.
2.High Strength and Durability
A182 F53 offers twice the strength of standard 316L stainless steel, reducing material thickness and weight for offshore structures.
Its high tensile and yield strength allows it to withstand extreme pressures, making it perfect for subsea pipelines, offshore platforms, and marine fasteners.
3.Excellent Performance in Extreme Temperatures
A182 F53 maintains its strength and corrosion resistance across a wide range of temperatures, making it suitable for deep-sea applications where temperatures fluctuate.
4.Long Service Life and Cost Efficiency
The exceptional durability and resistance to marine corrosion reduce maintenance and replacement costs, making it a cost-effective solution for offshore industries.
A182 F53 duplex stainless steel flanges for offshore use
Applications of A182 F53 in Marine and Offshore Industries
Our customers use A182 F53 duplex stainless steel fittings and flanges in:
- Subsea pipelines and manifolds
- Offshore platforms and FPSOs (Floating Production Storage and Offloading units)
- Seawater desalination plants
- Heat exchangers and pressure vessels
- Marine pumps, valves, and flanges
- Oil and gas exploration equipment
These projects often require tight delivery schedules and zero compromise on material integrity.
Frequently Asked Questions (FAQ)
Q: What pressure classes are available?
A: We can produce A182 F53 flanges in Class 150–2500, depending on size and design.
Q: Do you offer impact testing?
A: Yes. Impact tests can be performed at -46°C or other temperatures upon request.
Q: Can you supply dual-certified F53/F55 materials?
A: Generally, F53 is supplied to UNS S32750, but if dual certification is needed, we can discuss options with our approved mills.
Q: How do you protect products during shipping?
A: All machined surfaces are oiled and capped. Items are wrapped with moisture barrier film and packed in treated wooden crates.
Haihao Group: Your Trusted Supplier of Marine-Grade Materials
As a leading expert in the pipeline system industry, Haihao Group provides high-quality A182 F53 components, including flanges, fittings, and pipeline accessories, for offshore and marine engineering projects. Our products are certified by ABS, DNV, BV, and other major classification societies, ensuring compliance with international standards.
We have extensive experience supplying marine-grade pipeline solutions for various offshore projects. If you require reliable and corrosion-resistant materials for your offshore or subsea operations, contact Haihao Group today! Email:sales@haihaogroup.com