ASTM A240 Type 2507 Stainless Steel Sheet & Plate
What is ASTM A240 Type 2507 Stainless Steel Sheet and Plate？
As a professional stainless steel supplier, SHH STEEL is pleased to present ASTM A240 Type 2507 Stainless Steel Sheet and Plate. Also known as Super Duplex 2507 or UNS S32750, this grade is a high-alloy duplex stainless steel with a balanced austenitic-ferritic microstructure.
Type 2507 contains approximately 25% chromium, 7% nickel, 4% molybdenum and 0.27% nitrogen. This composition delivers a PREN (Pitting Resistance Equivalent Number) typically above 40, providing exceptional resistance to pitting, crevice corrosion and chloride stress corrosion cracking, while offering roughly twice the yield strength of standard austenitic grades such as 316L and significantly higher strength than 2205. SHH STEEL supplies ASTM A240 Type 2507 in both sheet and plate forms, covering thicknesses from 0.5 mm to 80 mm (thicker plates available on request), with widths up to 2000–2500 mm and lengths up to 12000 mm. Custom sizes and surface finishes are available.
The material is typically delivered in the solution-annealed condition with full Mill Test Certificates (EN 10204 3.1). Whether for thin sheet fabrication or heavy plate applications, SHH STEEL provides consistent quality for oil & gas, chemical processing, desalination and marine projects worldwide.
Material Specification
ASTM A240 Type 2507 stainless steel sheet and plate are manufactured in accordance with ASTM A240/A240M and ASME SA-240.
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASTM A240 / ASME SA-240 Type 2507 | Full compliance |
| UNS Designation | S32750 | Confirmed |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.5 mm – 80 mm (thicker available) | Custom sizes available |
| Width / Length | Up to 2000–2500 mm / 12000 mm | Custom fabrication supported |
| Surface Finish | 2B, No.1, BA, HL | Multiple options |
| Heat Treatment Condition | Solution Annealed | Standard supply condition |
| Certification | EN 10204 3.1 / 3.2 | Available |
Chemical Composition
The chemical composition of ASTM A240 Type 2507 (UNS S32750) is optimized for maximum corrosion resistance and high strength.
| Element | Content (%) | Standard Limit | Role |
|---|---|---|---|
| Carbon (C) | ≤ 0.030 | 0.030 max | Low carbon for good weldability |
| Manganese (Mn) | ≤ 1.20 | 1.20 max | Deoxidation |
| Silicon (Si) | ≤ 0.80 | 0.80 max | Deoxidation |
| Phosphorus (P) | ≤ 0.035 | 0.035 max | Impurity control |
| Sulfur (S) | ≤ 0.020 | 0.020 max | Cleanliness |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 | Corrosion resistance and ferrite balance |
| Nickel (Ni) | 6.0 – 8.0 | 6.0 – 8.0 | Austenite stability |
| Molybdenum (Mo) | 3.0 – 5.0 | 3.0 – 5.0 | Pitting and crevice corrosion resistance |
| Nitrogen (N) | 0.24 – 0.32 | 0.24 – 0.32 | Strength and pitting resistance |
| Copper (Cu) | ≤ 0.50 | 0.50 max | Optional |
Mechanical Properties
In the solution-annealed condition, ASTM A240 Type 2507 offers exceptionally high strength.
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | ≥ 795 MPa (115 ksi) | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | ≥ 15% | ASTM A370 |
| Hardness | ≤ 32 HRC / ≤ 310 HB | ASTM E18/E10 |
| Density | 7.98 – 8.0 g/cm³ | — |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 2507 primarily in the solution-annealed and pickled condition. Detailed capabilities by surface finish are as follows:
2B Finish (Cold-rolled, annealed, pickled and skin-passed)
- Typical thickness range: 0.5 mm – 6.0 mm
- Maximum width: up to 1500–2000 mm depending on thickness
- Preferred for applications requiring a smooth surface and good flatness.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 80 mm (thicker plates available)
- Maximum width: up to 2000–2500 mm
- Standard finish for heavy plates used in oil & gas, chemical and marine equipment.
Other Finishes
- BA (Bright Annealed) and HL (Hairline) available on request in limited thickness ranges.
Protective PVC film can be applied on one or both sides. Precision cutting (plasma, laser or waterjet) and closer dimensional tolerances are available upon request.
Tolerances
Dimensional tolerances for ASTM A240 Type 2507 sheet and plate follow ASTM A480/A480M.
- Thickness tolerances vary by product form and thickness.
- Width tolerance is typically +6 mm / 0 mm.
- Length tolerance for cut-to-length material is normally +10 mm / 0 mm.
- Flatness is controlled according to ASTM A480; improved flatness can be supplied for precision fabrication.
- Edge conditions include mill edge, slit edge, sheared edge or plasma/laser cut edge according to customer preference.
Tighter tolerances can be arranged for special projects.
Weldability
ASTM A240 Type 2507 offers good weldability when proper procedures are followed. It can be welded by GTAW (TIG), GMAW (MIG), SMAW and plasma processes. Matching or overalloyed filler metals such as ER2594 are recommended to maintain the balanced duplex microstructure and high corrosion resistance in the weld metal.
Heat input should be carefully controlled and interpass temperature kept low (typically below 100–150°C) to avoid formation of intermetallic phases. Preheating is generally not required. Post-weld heat treatment is normally not necessary, but thorough cleaning and passivation after welding are strongly recommended to restore full corrosion resistance.
Equivalent Material Grades
| Grade | Standard | Designation |
|---|---|---|
| Type 2507 | ASTM A240 / ASME SA-240 | — |
| UNS S32750 | Unified Numbering System | — |
| 1.4410 | EN 10088 / EN 10028-7 | X2CrNiMoN25-7-4 |
| F53 | ASTM A182 (forgings) | — |
| Related Chinese grades | GB/T series | Super duplex 25Cr-7Ni-4Mo-N types |
| SS 2328 | Swedish Standard | — |
Applications
ASTM A240 Type 2507 is selected for the most demanding chloride and high-strength environments. Typical applications are shown below with relevant keywords:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Oil & Gas / Subsea | Piping, manifolds, Christmas trees, umbilicals – A240 2507 Oil Gas |
| Chemical Processing | Reactors, heat exchangers, process equipment – A240 2507 Chemical Processing |
| Desalination & Seawater | Seawater systems, reverse osmosis equipment – A240 2507 Desalination |
| Pulp & Paper | Digesters, bleach plants, recovery systems – A240 2507 Pulp Paper |
| Pollution Control / FGD | Scrubbers, absorbers, high-chloride environments – A240 2507 FGD |
| Pressure Vessels & Heat Exchangers | High-strength, high-corrosion service – A240 2507 Pressure Vessel |
| Marine & Offshore | Structural and process components in seawater – A240 2507 Marine |
Why Choose SHH STEEL
SHH STEEL maintains long-term strategic cooperation with major Chinese stainless steel mills and acts as a first-level (primary) agent for these mills. This direct partnership enables us to offer competitive pricing advantages, faster delivery times and consistent quality assurance that many intermediate traders cannot match.
All ASTM A240 Type 2507 material is sourced from reputable Chinese mills under strict quality control, supplied with complete Mill Test Certificates, and supported by our professional export team. Customers benefit from reliable supply, short lead times, technical support and cost-effective solutions for oil & gas, chemical and marine applications worldwide.
FAQ
- What is the main advantage of 2507 compared with 2205?Type 2507 (super duplex) offers higher chromium, molybdenum and nitrogen contents, resulting in a significantly higher PREN (typically >40 vs ~35 for 2205), better pitting/crevice corrosion resistance and higher mechanical strength.
- What is the density of ASTM A240 Type 2507?Approximately 7.98 – 8.0 g/cm³.
- What are the equivalent grades of ASTM A240 Type 2507?Common equivalents include UNS S32750, EN 1.4410 (X2CrNiMoN25-7-4), F53 and related Chinese super duplex grades.
- Is Type 2507 suitable for high-temperature service?Type 2507 is generally limited to continuous service below approximately 250–300°C to avoid embrittlement from intermetallic phases (sigma, chi, etc.). It is not recommended for prolonged exposure above this temperature range.
- What filler metal is recommended for welding 2507?ER2594 or equivalent overalloyed duplex filler metals are commonly recommended to maintain corrosion resistance and phase balance in the weld metal.
Conclusion
ASTM A240 Type 2507 Stainless Steel Sheet and Plate from SHH STEEL deliver exceptionally high strength and outstanding resistance to chloride environments through a super duplex microstructure. With strict quality control, flexible sizing options, competitive pricing through direct mill partnerships and professional global export service, we provide trusted solutions for oil & gas, chemical processing, desalination and marine applications worldwide.
Contact SHH STEEL today for your ASTM A240 Type 2507 requirements.
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