ASME SA240 2205 Stainless Steel Plate | SA240 Type 2205
What is ASME SA240 2205 Stainless Steel Plate?
As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 2205 Stainless Steel Plate, also known as SA240 Type 2205 or UNS S32205.
ASME SA240 Type 2205 is a nitrogen-enhanced duplex (austenitic-ferritic) stainless steel. It features a balanced microstructure of approximately 50% austenite and 50% ferrite, delivering a unique combination of high strength, excellent resistance to chloride stress corrosion cracking, and superior resistance to pitting and crevice corrosion compared with standard austenitic grades such as 316L and 317L. The typical PREN (Pitting Resistance Equivalent Number) of 2205 is ≥ 35, significantly higher than that of 316L (≈24) or 317L (≈30).
The high yield strength of Type 2205 (approximately twice that of 316L) allows designers to reduce wall thickness and weight in many applications while maintaining or improving structural integrity and corrosion performance. It is widely used in oil & gas, chemical processing, petrochemical, marine, desalination, pulp & paper, and pressure vessel applications.
SHH STEEL supplies ASME SA240 2205 as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, full heat traceability, and shorter lead times. We offer thicknesses from 1 mm to 80 mm (thicker plates available on request), widths up to 2000–3000 mm, and lengths up to 12000 mm or cut-to-length. Material is supplied in the solution-annealed condition with a full range of surface finishes.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASME SA240 / SA240M | Full compliance |
| Steel Grade | Type 2205 (UNS S32205 / S31803) | Confirmed |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 1 mm – 80 mm (thicker available) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | No.1, 2B, No.4, and others on request | Available |
| Certification | EN 10204 3.1 / ASME Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (Ladle Analysis) according to ASME SA240 Type 2205 (UNS S32205):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 22.00 – 23.00 |
| Nickel (Ni) | 4.50 – 6.50 |
| Molybdenum (Mo) | 3.00 – 3.50 |
| Nitrogen (N) | 0.14 – 0.20 |
| Iron (Fe) | Balance |
Product Analysis (typical permissible variations):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 21.50 – 23.50 |
| Nickel (Ni) | 4.50 – 6.50 |
| Molybdenum (Mo) | 3.00 – 3.50 |
| Nitrogen (N) | 0.14 – 0.20 |
The balanced Cr-Ni-Mo-N composition produces the characteristic duplex microstructure and high PREN value that give Type 2205 its excellent combination of strength and corrosion resistance. Nitrogen enhances both strength and pitting resistance while helping to stabilize the austenite phase.
Mechanical Properties
Room-Temperature Mechanical Properties (Solution Annealed Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa (90 ksi) |
| Yield Strength (0.2%) | ≥ 450 MPa (65 ksi) |
| Elongation (in 50 mm) | ≥ 25% |
| Hardness | ≤ 290 HB / ≤ 31 HRC |
Key Advantage The yield strength of ASME SA240 2205 is approximately twice that of standard austenitic grades such as 316L. This allows significant weight reduction in many designs while maintaining structural integrity.
Physical Properties
- Density: approximately 7.80 g/cm³
- Magnetic: Partially magnetic due to the ferritic phase
- Thermal Expansion: Lower than austenitic grades (advantage in thermal cycling)
Material Comparison
| Grade | Structure | Yield Strength (min) | PREN (approx.) | Primary Advantage | Typical Preference |
|---|---|---|---|---|---|
| SA240 Type 316L | Austenitic | 170 MPa | ≈ 24 | Excellent weldability, economical | Moderate chloride service |
| SA240 Type 317L | Austenitic | 205 MPa | ≈ 30 | Higher pitting resistance | Aggressive chloride service |
| SA240 Type 2205 | Duplex | 450 MPa | ≥ 35 | High strength + excellent SCC & pitting resistance | High-strength chloride & stress corrosion service |
| SA240 Type 2507 | Super Duplex | 550 MPa | ≥ 40 | Even higher corrosion resistance & strength | Most severe seawater / high-chloride service |
| SA240 Type 904L | Super Austenitic | 220 MPa | ≈ 35 | Excellent resistance to reducing acids | Strong reducing acid environments |
ASME SA240 2205 is the standard duplex grade chosen when higher strength and better resistance to chloride stress corrosion cracking are required compared with 316L or 317L. For the most aggressive seawater or high-chloride environments, super duplex grades such as 2507 are often selected. Related austenitic options frequently compared include astm a240 type 316l stainless steel sheet plate and astm a240 type 317l stainless steel sheet plate.
Corrosion Resistance
ASME SA240 Type 2205 offers outstanding resistance to chloride stress corrosion cracking — far superior to standard austenitic grades such as 304L and 316L. It also provides excellent resistance to pitting and crevice corrosion in chloride-containing environments, with a typical critical pitting temperature significantly higher than that of 316L.
The grade performs well in many chemical process media, seawater, brackish water, and sour service (within appropriate limits). Its duplex microstructure and high nitrogen content contribute to both high strength and improved localized corrosion resistance.
Weldability
ASME SA240 Type 2205 can be welded by most standard fusion welding methods. Proper welding procedures are essential to maintain the balanced duplex microstructure and corrosion resistance.
Key points:
- Matching duplex filler metals (e.g., ER2209) are recommended.
- Heat input and interpass temperature must be carefully controlled (typically interpass ≤ 150°C).
- Nitrogen loss in the weld pool should be minimized.
- Post-weld heat treatment is generally not required for most applications, but solution annealing may be used for critical service.
When properly welded, the joint retains good strength and corrosion performance close to that of the base metal.
Heat Treatment
ASME SA240 Type 2205 is supplied in the solution-annealed condition.
Recommended Solution Annealing Parameters
- Temperature range: 1020 – 1100°C (typically 1040 – 1080°C)
- Holding (soaking) time: – Plates ≤ 25 mm: minimum 15–30 minutes after the section reaches temperature – Plates 25–50 mm: minimum 30–45 minutes – Plates > 50 mm: 45–90 minutes or longer to ensure uniformity
- Cooling: Rapid cooling is critical. Water quenching is mandatory for most thicknesses to preserve the balanced duplex microstructure and maximum corrosion resistance. Slow cooling can lead to formation of intermetallic phases (sigma, chi) that severely degrade toughness and corrosion resistance.
Proper solution annealing and rapid cooling are essential for Type 2205 performance.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | SA240 2205 No.1 – most common for pressure vessel and industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 2205 2B – thinner plates and general fabrication |
| No.4 | Brushed finish | SA240 2205 No.4 – when improved surface appearance is required |
| Special | Ground or custom finishes | SA240 2205 Special – on request |
SHH STEEL regularly supplies ASME SA240 2205 in No.1 and 2B finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances conform to ASME SA240 and the general requirements of ASTM A480. Thickness, width, length, and flatness are controlled within standard or tighter agreed limits.
Equivalent Material Grades
Dimensional tolerances conform to ASME SA240 and the general requirements of ASTM A480. Thickness, width, length, and flatness are controlled within standard or tighter agreed limits.
Equivalent Material Grades
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 2205 | ASME SA240 | — |
| A240 Type 2205 | ASTM A240 | Essentially identical |
| UNS S32205 / S31803 | — | Unified Numbering System |
| 1.4462 / X2CrNiMoN22-5-3 | EN 10088-2 | European equivalent |
| SUS329J3L | JIS G4305 | Japanese related duplex grade |
| 022Cr22Ni5Mo3N | GB/T 3280 | Chinese equivalent |
Related grades frequently evaluated with ASME SA240 2205 include astm a240 type 316l stainless steel sheet plate, astm a240 type 317l stainless steel sheet plate, and higher-alloy duplex or super duplex grades when more severe conditions are encountered.
Applications
ASME SA240 Type 2205 is widely used in high-strength and highly corrosive chloride environments:
| Industry / Sector | Typical Components / Equipment |
|---|---|
| Oil & Gas / Offshore | Pipelines, manifolds, separators, structural components |
| Chemical & Petrochemical | Reactors, tanks, heat exchangers, process piping |
| Desalination & Water Treatment | Pressure vessels, piping, evaporators |
| Marine & Shipbuilding | Seawater systems, structural parts |
| Pulp & Paper | Digesters, bleaching equipment |
| Pressure Vessels | ASME Code vessels requiring high strength & corrosion resistance |
| Flue Gas Desulfurization | Absorber components |
| General Fabrication | High-strength structures in chloride service |
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term strategic cooperation with major Chinese stainless steel mills and supply ASME SA240 Type 2205 with the following advantages:
- Competitive mill-direct pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1 / ASME)
- Flexible dimensions and surface finishes (including SA240 2205 No.1 and SA240 2205 2B)
- Technical support for duplex material selection and fabrication
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 2205 over SA240 316L?Type 2205 offers approximately twice the yield strength and significantly better resistance to chloride stress corrosion cracking and pitting corrosion compared with 316L.
- Is ASME SA240 2205 magnetic?Yes, it is partially magnetic because of its ferritic phase in the duplex microstructure.
- What is the typical PREN of Type 2205?Typically ≥ 35, significantly higher than 316L (≈24) or 317L (≈30).
- Can 2205 be used in place of 316L for weight reduction?Yes. The higher strength often allows thinner wall designs, resulting in weight and cost savings while improving corrosion performance.
- What is the density of SA240 Type 2205?Approximately 7.80 g/cm³.
- Can SHH STEEL supply dual-certified ASME SA240 / ASTM A240 Type 2205?Yes, dual certification is commonly available.
Conclusion
ASME SA240 2205 Stainless Steel Plate (SA240 Type 2205 / UNS S32205) is the industry-standard nitrogen-enhanced duplex stainless steel that delivers high strength, excellent resistance to chloride stress corrosion cracking, and superior pitting resistance. It is the preferred material when designers need to combine structural efficiency with reliable performance in chloride-containing environments.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 2205 plate with competitive pricing, full certification, and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 2205 No.1 and SA240 2205 2B), or a competitive quotation.
ASME SA240 2205 Stainless Steel Plate, SA240 Type 2205, SA240 2205, ASME SA240 Type 2205, 2205 stainless steel plate, duplex 2205, SA240 2205 supplier
Quality Steel Needed? Inquire for Offers
Related Products
