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2205 Duplex stainless steel investment casting
Duplex stainless steel investment casting.webp
2205 Duplex stainless steel casting.webp
Duplex stainless steel casting.webp

2205 Duplex stainless steel investment casting

2205 duplex stainless steel investment castings combine the best properties of austenitic and ferritic stainless steels, delivering excellent corrosion resistance, high strength, and superior stress corrosion cracking resistance. Used extensively in harsh environments (seawater, acidic, and high-chloride applications), these castings provide long service life while reducing maintenance costs.

Our precision investment casting process ensures tight dimensional tolerances (CT4-CT6), smooth surface finishes (RA 3.2μm max), and high metallurgical integrity, making them ideal for critical industrial components.

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    product details

    2205 Duplex stainless steel

    2205 duplex stainless steel is a high-performance alloy that combines the corrosion resistance of austenitic stainless steels with the strength of ferritic stainless steels.

    Chemical Composition (ASTM A890/A995)
    # Element Composition (%) Effect on Performance
    1 Chromium (Cr) 21.0 - 23.0 Enhances corrosion resistance
    2 Nickel (Ni) 4.5 - 6.5 Stabilizes austenitic phase
    3 Molybdenum (Mo) 2.5 - 3.5 Improves pitting resistance
    4 Nitrogen (N) 0.08 - 0.20 Increases strength & corrosion resistance
    5 Manganese (Mn) ≤ 2.0 Improves machinability

    Improves Machinability
    # Property Value Advantage
    1 Tensile Strength 620-895 MPa Withstands high-pressure environments
    2 Yield Strength ≥ 450 MPa Excellent load-bearing capacity
    3 Elongation ≥ 25% Good ductility for complex shapes
    4 Hardness 290 HB Max Ideal for wear-resistant parts
    5 Impact Toughness ≥ 100 J (-46°C) Reliable in cryogenic conditions

    Why Choose 2205 Duplex Stainless Steel Castings?

    ✅ Superior Corrosion Resistance – Outperforms 316L stainless steel in chloride-rich environments.
    ✅ High Strength – Nearly 2x stronger than standard austenitic grades.
    ✅ Stress Corrosion Cracking (SCC) Resistance – Ideal for subsea and chemical processing.
    ✅ Cost-Effective –  Longer lifespan reduces replacement frequency.

    Material Corrosion Resistance Strength Cost Best For
    2205 Duplex ★★★★★ ★★★★☆ ★★★☆☆ High-chloride, acidic,
    and high-pressure environments
    316L Austenitic ★★★★☆ ★★☆☆☆ ★★★★☆ General corrosion resistance
    Super Duplex (2507) ★★★★★ ★★★★★ ★★☆☆☆ Extreme corrosion conditions

    Applications

    2205 duplex stainless steel castings are widely used in industries requiring:

    123.png Oil & Gas – Valve bodies, pump housings, wellhead components.

    123.png Marine Engineering – Propeller shafts, seawater fittings.

    123.png Chemical Processing – Reactor vessels, heat exchangers. 

    123.png Desalination Plants – High-pressure pipe fittings, brine pumps.

    123.png Pharmaceutical – Sanitary piping & mixing components. 

    Case Study: A leading offshore oil platform supplier switched from 316L to 2205 castings – reducing failures by 63% in seawater service. 

    Quality Assurance & Testing

    We ensure zero defects through rigorous testing:
    ✧ Liquid Penetrant (PT) – Detects surface imperfections.
    ✧ Radiographic Testing (RT) – Internal flaw detection.
    ✧ Feritscope Analysis – Maintains 30-50% ferrite content (key to duplex performance).
    ✧ Hydrostatic Testing – Guarantees leak-proof components. 
    Standards Compliance: ASTM A995 / A890, EN 10283, NACE MR0175 
     
    Interested in a Custom Investment Casting solution? Contact us today for a quote.

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    PRODUCTION FOLW CONTROLCONTROL

    control 1_1

    Raw Material Quality Control

    1. Strictly monitor the chemical composition, purity, and impurity levels of metal materials (e.g., pig iron, scrap steel, alloys).
    2. Conduct performance tests (e.g., permeability, strength) on auxiliary materials such as casting sand and binders.
    control 2_1

    Melting Process Control

    1. Precisely control melting temperature (avoid overheating or insufficient heating).
    2. Ensure compositional uniformity with rapid chemical analysis before pouring.
    3. Perform deoxidation and degassing (vacuum melting for critical castings).
    control 3_1

    Mold/Core Quality Control

    1. Mold dimensional accuracy must meet drawing requirements (focus on parting surfaces, draft angles, etc.).
    2. Sand compactness, moisture content, and permeability must comply with process standards.
    3. Monitor curing levels for special processes like resin sand and lost foam casting.
    control 4_1

    Gating System Design Control

    1. Scientifically design gating systems (sprue, runner, and ingate ratios).
    2. Control pouring temperature (typically 50-150°C above the liquidus line).
    3. Use appropriate pouring speeds to avoid turbulence-induced gas entrapment.
    control 5_1

    Solidification Process Control

    1. Implement directional solidification techniques (e.g., mold temperature control, chill placement).
    2. Apply progressive solidification for critical components.
    3. Monitor cooling curves against expected profiles.
    control 6_1

    Post-Processing Control

    1. Strictly manage timing and methods for sand removal and riser cutting.
    2. Standardize heat treatment (annealing/normalizing/quenching with parameter logs).
    3. Control aging treatment time and temperature.
    control 7_1

    Dimensional & Defect Inspection

    1. Full-scale dimensional inspection (100% verification of critical dimensions).
    2. Apply non-destructive testing (X-ray, ultrasonic, magnetic particle inspection, etc.).
    3. Sample tests for microstructure and mechanical properties.
    control 8_1

    Traceability Management

    1. Maintain comprehensive records per batch (heat number, operators, timestamps, etc.).
    2. Archive process inspection data and visual documentation.
    3. Establish a complete quality file system.
    CERTIFICATE
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    One-stop serviceSSERVICES

    why_1
    CNC MACHINIG
    ✔ Multi-Material Machining — Aluminum, Steel, Titanium, Stainless Steel (17-4 PH), Plastics, etc.
    ✔ Multi-Axis CNC Machining — 3/4/5 Axis CNC for Complex Geometries
    ✔ Precision Grinding & Polishing — Surface Finish up to Ra 0.4μm
    ✔ Customized Production — From Small-Batch Prototyping to Large-Scale Mass Production
    ✔ Rigorous Quality Control — Full-Process CMM Inspection, Compliant with ISO 9001 Standards
    why_2
    hEAT TREATMENT
    We offer customized heat treatment processing services, 
    ✔  Annealing (eliminates internal stress, improves machinability) 
    ✔  Quenching & Tempering (enhances hardness and toughness) 
    ✔ Precipitation Hardening (e.g., 17-4 PH, H900/H1150) 
    Carburizing & Nitriding (improves surface wear resistance) 
    ✔  Vacuum/Controlled Atmosphere Heat Treatment (prevents oxidation, suitable for precision components)
    why_3
    SURFACE TREATMENT
    ✔ Coatings & Platings:
    ○ Electroplating (Zinc Plating, Nickel Plating, Chrome Plating, Electroless Nickel Plating, etc.)
    ○ Anodizing (Hard Anodizing for Aluminum, Color Anodizing)
    ○ PVD/CVD (TiN, CrN, DLC, and Other Hard Coatings) ○ Thermal Spraying (Plasma Spraying, Arc Spraying)
    ✔ Conversion Coatings:
    ○ Passivation (Stainless Steel, Aluminum Alloys)
    ○ Phosphating (Rust Prevention for Steel, Enhanced Paint Adhesion)
    ○ Blackening/Bluing (Aesthetics and Basic Rust Resistance)