ASME SA240 2507 Stainless Steel Plate | SA240 Type 2507
What is ASME SA240 2507 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 2507 Stainless Steel Plate, also known as SA240 Type 2507 or UNS S32750.
ASME SA240 Type 2507 is a nitrogen-enhanced super duplex (austenitic-ferritic) stainless steel. It contains approximately 25% chromium, 7% nickel, 4% molybdenum and elevated nitrogen, producing a balanced duplex microstructure with a very high Pitting Resistance Equivalent Number (PREN typically ≥ 40–43). This combination delivers outstanding resistance to pitting, crevice corrosion and chloride stress corrosion cracking, together with very high mechanical strength — significantly higher than standard duplex 2205 and far higher than austenitic grades such as 316L or 317L.
Type 2507 is specifically designed for the most severe chloride-containing environments, including seawater, offshore oil & gas, desalination, chemical processing and flue-gas systems. The high strength allows designers to reduce wall thickness and weight while achieving superior corrosion performance and structural reliability.
SHH STEEL supplies ASME SA240 2507 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 60 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 2507 (UNS S32750) | Confirmed |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 1 mm – 60 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 2507 (UNS S32750):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.80 |
| Manganese (Mn) | ≤ 1.20 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 24.00 – 26.00 |
| Nickel (Ni) | 6.00 – 8.00 |
| Molybdenum (Mo) | 3.00 – 5.00 |
| Nitrogen (N) | 0.24 – 0.32 |
| Copper (Cu) | ≤ 0.50 |
| Iron (Fe) | Balance |
Product Analysis (typical permissible variations):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.80 |
| Manganese (Mn) | ≤ 1.20 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 24.00 – 26.00 |
| Nickel (Ni) | 6.00 – 8.00 |
| Molybdenum (Mo) | 3.00 – 5.00 |
| Nitrogen (N) | 0.24 – 0.32 |
The high chromium, molybdenum and nitrogen contents produce a PREN value typically ≥ 40–43, placing Type 2507 firmly in the super duplex category and giving it outstanding resistance to localized corrosion in severe chloride environments.
Mechanical Properties
Room-Temperature Mechanical Properties (Solution Annealed Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 795 MPa (115 ksi) |
| Yield Strength (0.2%) | ≥ 550 MPa (80 ksi) |
| Elongation (in 50 mm) | ≥ 15% |
| Hardness | ≤ 310 HB / ≤ 32 HRC |
Key Advantage The yield strength of ASME SA240 2507 is significantly higher than that of standard duplex 2205 and more than double that of austenitic grades such as 316L. This enables substantial weight savings in many designs.
Physical Properties
- Density: approximately 7.80 g/cm³
- Magnetic: Partially magnetic due to the ferritic phase
- Thermal Expansion: Lower than austenitic grades
Material Comparison
| Grade | Structure | Yield Strength (min) | PREN (approx.) | Primary Advantage | Typical Preference |
|---|---|---|---|---|---|
| SA240 Type 316L | Austenitic | 170 MPa | ≈ 24 | Economical, excellent weldability | Moderate chloride service |
| SA240 Type 2205 | Duplex | 450 MPa | ≥ 35 | High strength + good SCC & pitting resistance | Standard high-strength chloride service |
| SA240 Type 2507 | Super Duplex | 550 MPa | ≥ 40–43 | Very high strength + outstanding corrosion resistance | 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 2507 is selected when the corrosion severity or strength requirements exceed the capabilities of standard duplex 2205. It is the preferred material for the most aggressive chloride environments. For less severe conditions, astm a240 type 2205 stainless steel sheet plate often provides a more economical solution. Related austenitic grades such as astm a240 type 317l stainless steel sheet plate and astm a240 type 904l stainless steel sheet plate are considered when different corrosion mechanisms dominate.
Corrosion Resistance
ASME SA240 Type 2507 offers outstanding resistance to pitting and crevice corrosion in high-chloride environments, including seawater and brackish water. Its critical pitting temperature and critical crevice temperature are significantly higher than those of 2205 and far higher than those of 316L or 317L.
The grade also provides excellent resistance to chloride stress corrosion cracking and performs well in many chemical process media. It is widely used in sour service within appropriate limits and in environments where both high strength and superior localized corrosion resistance are required.
Weldability
ASME SA240 Type 2507 can be welded by most standard fusion welding methods, but procedures must be carefully controlled to maintain the balanced super duplex microstructure and corrosion resistance.
Key points:
- Matching super duplex filler metals (e.g., ER2594) are recommended.
- Heat input and interpass temperature must be strictly controlled (typically interpass ≤ 100–150°C).
- Nitrogen loss in the weld pool should be minimized.
- Rapid cooling after welding is important.
- Solution annealing after welding may be required for the most critical applications.
When proper procedures are followed, the welded joint retains high strength and excellent corrosion performance.
Heat Treatment
ASME SA240 Type 2507 is supplied in the solution-annealed condition.
Recommended Solution Annealing Parameters
- Temperature range: 1050 – 1125°C (typically 1080 – 1120°C)
- Holding (soaking) time: – Plates ≤ 25 mm: minimum 15–30 minutes after the section reaches temperature – Plates 25–50 mm: minimum 30–60 minutes – Plates > 50 mm: 60–90 minutes or longer to ensure uniformity
- Cooling: Very rapid cooling is critical. Water quenching is mandatory for virtually all thicknesses to avoid formation of intermetallic phases (sigma, chi, etc.) that severely degrade toughness and corrosion resistance.
Proper solution annealing followed by rapid quenching is essential to achieve the optimum microstructure and performance of Type 2507.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | SA240 2507 No.1 – most common for pressure vessel and industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 2507 2B – thinner plates and general fabrication |
| No.4 | Brushed finish | SA240 2507 No.4 – when improved surface appearance is required |
| Special | Ground or custom finishes | SA240 2507 Special – on request |
SHH STEEL regularly supplies ASME SA240 2507 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
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 2507 | ASME SA240 | — |
| A240 Type 2507 | ASTM A240 | Essentially identical |
| UNS S32750 | — | Unified Numbering System |
| 1.4410 / X2CrNiMoN25-7-4 | EN 10088-2 | European equivalent |
| Related super duplex | JIS / GB | Approximate national equivalents |
Related grades frequently evaluated with ASME SA240 2507 include astm a240 type 2205 stainless steel sheet plate, astm a240 type 317l stainless steel sheet plate, and astm a240 type 904l stainless steel sheet plate.
Applications
ASME SA240 Type 2507 is used in the most severe chloride and high-strength applications:
| Industry / Sector | Typical Components / Equipment |
|---|---|
| Oil & Gas / Offshore | Subsea equipment, manifolds, pipelines, structural components |
| Desalination | High-pressure piping, evaporators, vessels |
| Seawater Systems | Pumps, valves, piping, heat exchangers |
| Chemical & Petrochemical | Reactors, tanks and piping in severe chloride media |
| Flue Gas Desulfurization | Critical absorber components |
| Pressure Vessels | ASME Code vessels requiring very high strength & corrosion resistance |
| Marine & Shipbuilding | Critical seawater-exposed structures |
| Pulp & Paper | Severe bleaching and digester environments |
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 2507 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 2507 No.1 and SA240 2507 2B)
- Technical support for super duplex material selection and fabrication
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 2507 over SA240 2205?Type 2507 offers higher strength, significantly better resistance to pitting and crevice corrosion (higher PREN), and superior performance in the most severe chloride environments such as seawater.
- Is ASME SA240 2507 magnetic?Yes, it is partially magnetic because of its ferritic phase in the super duplex microstructure.
- What is the typical PREN of Type 2507?Typically ≥ 40–43, placing it in the super duplex category.
- Can 2507 be used to replace 2205 for weight reduction?Yes. The higher strength often allows further reduction in wall thickness compared with 2205, while providing better corrosion resistance.
- What is the density of SA240 Type 2507?Approximately 7.80 g/cm³.
- Can SHH STEEL supply dual-certified ASME SA240 / ASTM A240 Type 2507?Yes, dual certification is commonly available.
Conclusion
ASME SA240 2507 Stainless Steel Plate (SA240 Type 2507 / UNS S32750) is a high-performance super duplex stainless steel that delivers very high strength and outstanding resistance to pitting, crevice corrosion and chloride stress corrosion cracking. It is the material of choice for the most severe seawater, offshore and high-chloride process applications where standard duplex 2205 is no longer sufficient.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 2507 plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 2507 No.1 and SA240 2507 2B), or a competitive quotation.
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