Duplex Stainless Steel Castings for Marine Environment
Marine applications require metal parts that can resist harsh saltwater corrosion while maintaining high mechanical strength. Duplex stainless steel castings offer the perfect balance of durability and corrosion resistance for pumps, valves, ship fittings, and offshore equipment. In this article, we explain why duplex stainless steel is ideal for marine environments and how JC Casting ensures precision and reliability.
What Is Duplex Stainless Steel?
- Duplex stainless steel combines austenitic and ferritic microstructures, offering higher strength than standard austenitic stainless steels.
- Key grades for marine casting include 2205 and 2507, known for excellent corrosion resistance in chloride-rich environments.
- Compared to 304/316, duplex steels have twice the yield strength, making them suitable for high-pressure and high-stress applications.
Learn more about stainless steel casting materials and our investment casting process.
Advantages of Duplex Stainless Steel for Marine Applications
- Superior Corrosion Resistance: Excellent against pitting and stress corrosion in seawater.
- High Mechanical Strength: Can reduce wall thickness, saving material costs.
- Durability in Extreme Conditions: Suitable for offshore platforms and ship components.
- Long Service Life: Reduces maintenance frequency in marine equipment.
Typical Marine Components Made from Duplex Stainless Steel
- Pump housings and impellers
- Valves and valve bodies
- Propeller shafts and couplings
- Offshore structural components
- Heat exchangers for desalination plants
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Our Duplex Stainless Steel Casting Process
- Investment Casting (Lost Wax): Precision cast complex shapes for pumps and valves.
- CNC Machining: Tight tolerances for functional marine parts.
- Heat Treatment: Achieve optimal mechanical properties.
- Inspection & Testing: Dimensional and material verification to ensure reliability.
Why Choose JC Casting for Marine Castings?
- Expertise in duplex stainless steel investment casting
- ISO-certified quality management system
- Over 20 years of experience producing marine-grade components
- One-stop solution from drawing to finished part
- Exported to Europe, North America, and Asia
Case Study
- Component: Duplex 2205 pump impeller
- Industry: Offshore water treatment
- Challenge: High chloride corrosion and tight tolerance
- Solution: Investment casting + CNC machining + rigorous quality inspection
- Result: Long-lasting, precise, and corrosion-resistant part delivered on schedule
Request a Quote for Your Marine Castings
Send us your drawings and our engineers will recommend the best duplex stainless steel casting solution for your marine equipment.