Stainless Steel SUS2205
Introduction to Stainless Steel SUS2205: A Highly Corrosion-Resistant Material for Demanding Applications
Stainless Steel SUS2205, also known as Duplex Stainless Steel, is a highly versatile material renowned for its excellent corrosion resistance, high strength, and superior fatigue resistance. Comprising a blend of austenitic and ferritic structures, SUS2205 offers exceptional resistance to pitting, crevice, and stress corrosion cracking, making it ideal for harsh environments. With a minimum yield strength of 450 MPa and a tensile strength of 620 MPa, SUS2205 is widely used in industries that demand high strength and corrosion resistance, such as chemical processing, marine applications, and oil and gas industries.
SUS2205 is also known for its outstanding weldability and formability, offering high machinability with minimal wear on cutting tools. Its excellent corrosion resistance is attributed to its high chromium (22%) and molybdenum (3%) content, ensuring that parts made from SUS2205 retain their strength and stability under extreme environmental conditions. At Neway, CNC-machined SUS2205 stainless steel parts are processed precisely to meet tight tolerances, ensuring long-lasting and high-performance components for critical applications.
SUS2205 Stainless Steel: Key Properties and Composition
SUS2205 Stainless Steel Chemical Composition
Element | Composition (wt%) | Role/Impact |
|---|---|---|
Carbon (C) | ≤0.03% | Low carbon content prevents carbide precipitation during welding, ensuring better weldability. |
Chromium (Cr) | 22% | Provides excellent corrosion resistance, particularly in chlorides and acidic environments. |
Molybdenum (Mo) | 3% | Enhances pitting resistance, making SUS2205 ideal for marine and chemical applications. |
Nickel (Ni) | 5.5–6.5% | Improves toughness and resistance to stress corrosion cracking. |
Manganese (Mn) | 1.5% | Improves strength and enhances toughness. |
Nitrogen (N) | 0.14–0.2% | Increases strength and resistance to corrosion, particularly in seawater. |
SUS2205 Stainless Steel Physical Properties
Property | Value | Notes |
|---|---|---|
Density | 7.80 g/cm³ | Similar to most stainless steels, providing a balanced weight for strength. |
Melting Point | 1,450°C | High melting point, ideal for applications in extreme temperatures. |
Thermal Conductivity | 15.1 W/m·K | Low thermal conductivity, making it resistant to heat-induced damage in specific applications. |
Electrical Resistivity | 0.75×10⁻⁶ Ω·m | Suitable for non-electrical applications. |
SUS2205 Stainless Steel Mechanical Properties
Property | Value | Testing Standard/Condition |
|---|---|---|
Tensile Strength | 620 MPa | ASTM A240/A240M standard |
Yield Strength | 450 MPa | Suitable for demanding industrial applications. |
Elongation (50mm gauge) | 25% | High ductility reduces cracking risk, improving durability. |
Brinell Hardness | 290 HB | Ensures a durable, wear-resistant surface suitable for harsh environments. |
Machinability Rating | 50% (vs. 1212 steel at 100%) | Moderately machinable with specialized tooling for optimal performance. |
Key Characteristics of SUS2205 Stainless Steel: Benefits and Comparisons
SUS2205 stainless steel offers a unique combination of strength and corrosion resistance, making it suitable for critical applications where other stainless steels may fail. Below is a technical comparison highlighting its advantages over other materials like 304 Stainless Steel, 316 Stainless Steel, and Duplex Stainless Steel 2507.
1. Superior Corrosion Resistance
Unique Trait: SUS2205’s high chromium (22%) and molybdenum (3%) content provide exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
Comparison:
vs. 304 Stainless Steel: SUS2205 has significantly better resistance to chloride-induced corrosion, making it suitable for marine and chemical applications.
vs. 316 Stainless Steel: While both have high corrosion resistance, SUS2205 offers better resistance in environments exposed to high pressure and temperature.
vs. Duplex Stainless Steel 2507: 2507 offers slightly higher strength but is more costly and challenging to machine compared to SUS2205.
2. High Strength and Durability
Unique Trait: With a yield strength of 450 MPa, SUS2205 provides greater structural integrity for components subjected to high stresses.
Comparison:
vs. 304 Stainless Steel: SUS2205 has approximately 30% higher strength, making it ideal for high-stress applications.
vs. 316 Stainless Steel: SUS2205 offers a cost-effective alternative to 316 with better strength for industrial applications, especially under high mechanical load.
3. Weldability and Fabrication Flexibility
Unique Trait: The low carbon content (≤0.03%) of SUS2205 enables good weldability without compromising strength or corrosion resistance.
Comparison:
vs. 304 Stainless Steel: SUS2205’s better weldability and strength make it more suitable for demanding welding applications.
vs. 316 Stainless Steel: SUS2205 is easier to weld than 316 in certain applications due to lower nickel content, while maintaining higher strength.
4. Cost Efficiency
Unique Trait: SUS2205 offers high performance at a relatively low cost compared to other duplex stainless steels.
Comparison:
vs. 316 Stainless Steel: SUS2205 is more cost-effective for applications requiring a balance of strength and corrosion resistance.
vs. Duplex Stainless Steel 2507: SUS2205 provides a more affordable option with good corrosion resistance, ideal for many marine and chemical environments.
5. Post-Processing Flexibility
Unique Trait: SUS2205 is compatible with several post-processing techniques, including polishing, passivation, and electropolishing, which enhance its appearance and corrosion resistance.
Comparison:
vs. 304 Stainless Steel: SUS2205 offers superior post-processing flexibility, improving surface finish and corrosion resistance.
vs. 316 Stainless Steel: Similar post-processing options, but SUS2205 provides better resistance to high-stress and high-corrosion environments.
CNC Machining Challenges and Solutions for SUS2205 Stainless Steel
Machining Challenges and Solutions
Challenge | Root Cause | Solution |
|---|---|---|
Work Hardening | High alloy content | Use carbide or ceramic tools with coatings to reduce wear. |
Surface Roughness | High hardness and strength | Employ slower feed rates and optimized tool paths for better finishes. |
Tool Wear | Abrasive nature of SUS2205 | Utilize coated tools and high-pressure coolant to extend tool life. |
Weld Cracking | Stress from welding | Preheat and post-heat treatments to minimize stress and cracking. |
Chip Formation | Stringy chips from duplex structure | Optimize tool angles and use high-speed machining to minimize chip formation. |
Optimized Machining Strategies
Strategy | Implementation | Benefit |
|---|---|---|
High-Speed Machining | Spindle speed: 1,200–1,500 RPM | Reduces heat buildup and increases tool life by 20%. |
Climb Milling | Directional cutting path for optimal surface finish | Achieves Ra 1.6–3.2 µm surface finish with improved dimensional accuracy. |
Toolpath Optimization | Use trochoidal milling for deep pockets | Reduces cutting forces by 35%, minimizing part deflection. |
Stress-Relief Annealing | Preheat to 650°C for 1 hour per inch | Minimizes dimensional variation to ±0.03 mm. |
Cutting Parameters for SUS2205 Stainless Steel
Operation | Tool Type | Spindle Speed (RPM) | Feed Rate (mm/rev) | Depth of Cut (mm) | Notes |
|---|---|---|---|---|---|
Rough Milling | 4-flute carbide end mill | 1,200–1,500 | 0.10–0.20 | 3.0–5.0 | Use flood coolant to prevent work hardening. |
Finish Milling | 2-flute carbide end mill | 1,500–2,000 | 0.05–0.10 | 1.0–2.0 | Climb milling for Ra 1.6–3.2 µm. |
Drilling | 135° split-point HSS drill | 600–800 | 0.12–0.18 | Full hole depth | Peck drilling for precise hole formation. |
Turning | CBN or coated carbide insert | 300–500 | 0.25–0.35 | 2.0–4.0 | Dry machining is acceptable with air blast cooling. |
Surface Treatments for CNC Machined SUS2205 Stainless Steel Parts
Electroplating: Adds a corrosion-resistant metallic layer, extending part life in humid environments and improving strength.
Polishing: Enhances the surface finish, providing a smooth, shiny appearance ideal for visible components.
Brushing: Creates a satin or matte finish, masking minor surface defects and improving aesthetic quality for architectural components.
PVD Coating: Boosts wear resistance, increasing tool life and part longevity in high-contact environments.
Passivation: Creates a protective oxide layer, enhancing corrosion resistance in mild environments without altering dimensions.
Powder Coating: Offers high durability, UV resistance, and a smooth finish, ideal for outdoor and automotive parts.
Teflon Coating: Provides non-stick and chemical-resistant properties, ideal for food processing and chemical handling components.
Chrome Plating: Adds a shiny, durable finish that enhances corrosion resistance, commonly used in automotive and tooling applications.
Black Oxide: Provides a corrosion-resistant black finish, ideal for parts in low-corrosion environments like gears and fasteners.
Industry Applications of CNC Machined SUS2205 Stainless Steel Parts
Automotive Industry
Exhaust Systems: SUS2205’s excellent corrosion resistance is ideal for exhaust systems in harsh environments.
Marine Industry
Boat Hulls: SUS2205 is widely used for boat hulls due to its resistance to saltwater corrosion.
Chemical Processing
Storage Tanks: SUS2205 ensures durability and strength in aggressive chemical environments, making it suitable for storage tanks.
Technical FAQs: CNC Machined SUS2205 Stainless Steel Parts & Services
What makes SUS2205 a superior material for marine applications compared to other stainless steels?
How does the duplex microstructure of SUS2205 affect its machinability?
What are the best surface treatments for enhancing the corrosion resistance of SUS2205 in harsh environments?
How does CNC machining optimize SUS2205 for use in high-pressure chemical processing applications?
What are the challenges of welding SUS2205 stainless steel and how can they be overcome?
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