Super Duplex 2507 — Stainless Steel (SS) Grade Specification, Properties & Equivalents
Super Duplex 2507, a high-performance ferritic-austenitic stainless steel, is engineered for extreme environments. Its balanced microstructure, combining the best properties of both phases, offers exceptional strength and corrosion resistance, making it a critical material for demanding applications across India. Industries such as offshore oil and gas, chemical processing, desalination plants, and petrochemicals rely heavily on Super Duplex 2507 for its superior performance in chloride-rich and acidic media. The grade's high chromium, molybdenum, and nitrogen content ensures excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, surpassing many conventional stainless steels. For Indian industrial buyers, understanding the precise specifications and sourcing options for Super Duplex 2507 is key to ensuring project success and operational reliability. MetaleMart provides a comprehensive overview of Super Duplex 2507, connecting buyers with reliable Indian manufacturers and stockists.
Chemical Composition of Super Duplex 2507
Super Duplex 2507 Chemical Composition
| Element | Weight % (UNS S32750) |
| CR | 24.0 - 26.0 |
| NI | 6.9 - 7.5 |
| MO | 3.0 - 3.5 |
| MN | 0.30 max |
| SI | 0.80 max |
| C | 0.07 max |
| P | 0.035 max |
| S | 0.020 max |
| N | 0.24 - 0.32 |
| Fe | Balance |
Mechanical Properties of Super Duplex 2507
Super Duplex 2507 Mechanical Properties
| Properties | Typical Values (UNS S32750) |
| Ultimate Tensile Strength (UTS) | 900 MPa min |
| Yield Strength (YS) (0.2% offset) | 650 MPa min |
| Elongation at Break | 15% min |
| Hardness (Brinell) | 310 max |
| Density | 7.8 g/cm³ |
| Modulus of Elasticity | 200 GPa |
Super Duplex 2507 Available Forms in India
| Shape | Typical Sizes | Standard Length |
| Seamless Pipes | 1/2" to 10" NB | 6 meters |
| Welded Pipes | 2" to 24" NB | 6 meters |
| Plates & Sheets | 1 mm to 50 mm thickness | Custom lengths |
| Bars & Rods | 5 mm to 100 mm diameter | 3 - 6 meters |
| Fittings | Elbows, Tees, Reducers | Standard sizes |
Super Duplex 2507 Real-world Applications
- Offshore Oil & Gas: Platforms, subsea components, risers
- Chemical Processing: Heat exchangers, tanks, piping systems
- Desalination Plants: Reverse osmosis modules, piping
- Petrochemical Industry: Reactors, distillation columns
- Power Generation: Flue gas desulfurization units
- Marine Engineering: Propellers, shafts, structural components
- Food & Beverage: Processing equipment in corrosive environments
- Pulp and Paper: Digesters, bleaching equipment
Super Duplex 2507 Machinability & Weldability
Machining Super Duplex 2507 requires careful consideration due to its high strength and work-hardening tendency. Use positive rake angles, sharp, rigid tooling, and moderate cutting speeds to prevent excessive heat buildup and tool wear. Flood lubrication with a sulphur-free cutting fluid is recommended. Common machining operations for Super Duplex 2507 include turning, milling, and drilling. For welding Super Duplex 2507, maintaining the correct metallurgical balance is crucial to preserve its excellent mechanical properties and corrosion resistance. Use matching filler metals, such as ER2594 or E2594 (equivalent to Super Duplex 2507), and low heat input techniques. Inert gas shielding, typically Argon, is necessary for both the root pass and the subsequent hot passes. Preheating is generally not required, but interpass temperatures should be kept below 150°C to avoid detrimental phase precipitation. Post-weld heat treatment (PWHT) for Super Duplex 2507 is typically not necessary, but if required for specific applications, it should be performed at 1100-1150°C followed by rapid cooling to avoid sigma phase embrittlement.
Super Duplex 2507 Heat Treatment & Processing
Processing Super Duplex 2507 involves specific heat treatment parameters to optimize its dual-phase microstructure. Solution annealing, the primary heat treatment, involves heating Super Duplex 2507 to temperatures between 1050°C and 1150°C, followed by rapid cooling (water quenching or rapid air cooling). This process dissolves secondary phases and ensures the desired ferritic-austenitic balance, maximizing corrosion resistance and mechanical strength. Hot working, such as forging or extrusion, should be performed within the 1150°C to 1250°C range. Cold working Super Duplex 2507 can be challenging due to its high strength and tendency to work harden, but it is achievable with adequate equipment and lubrication. If significant cold deformation is performed, a subsequent solution annealing treatment may be necessary. Avoid prolonged exposure to intermediate temperatures (e.g., 600°C to 900°C) during processing or welding, as this can lead to the precipitation of brittle intermetallic phases like sigma (σ) phase, which severely degrades the toughness and corrosion resistance of Super Duplex 2507.
Super Duplex 2507 Sourcing in India
Sourcing Super Duplex 2507 in India is typically handled by specialized stainless steel manufacturers and major industrial suppliers. Leading producers like Jindal Stainless, NE Steel, and various smaller, specialized mills cater to the demand for this high-performance alloy. Major stockists and distributors are concentrated in western India, particularly in Mumbai and its industrial belt around Pune, offering ready availability. Southern Indian hubs like Chennai also have suppliers. Minimum Order Quantities (MOQs) for Super Duplex 2507 can vary significantly; for larger mill orders, they might be in metric tons, while stockists can often supply smaller quantities for urgent requirements, sometimes starting from a few kilograms for bars or single pieces for pipes/sheets. The price band for Super Duplex 2507 is premium, generally ranging from INR 900 to INR 1500 per kilogram, varying with form, size, and prevailing market conditions. Material Test Certificates (MTC) conforming to EN 10204 3.1 are standard expectations, with 3.2 certifications available upon specific request, often involving third-party inspection agencies.
Super Duplex 2507 International Equivalents
| Standard | Code |
| UNS | S32750 |
| EN | 1.4410 |
| ASTM | A240, A790, A928 (Plate, Pipe, Fittings) |
| JIS | SUS 329 J4L |
| DIN | X2 Cr Ni MoN 25 7 4 |
| GOST | 12X18Н10Т (Similar but not identical) |
FAQs about Super Duplex 2507
What are the primary benefits of using Super Duplex 2507?
Super Duplex 2507 offers a unique combination of high strength (nearly double that of common austenitic stainless steels), excellent resistance to uniform and localized corrosion (pitting, crevice), and superior resistance to stress corrosion cracking, especially in chloride-containing environments. Its balanced duplex microstructure provides toughness and weldability superior to many high-alloy materials.
Where is Super Duplex 2507 most commonly applied in India?
In India, Super Duplex 2507 is extensively used in aggressive environments, particularly in the offshore oil and gas sector for platforms and subsea equipment. It's also critical in chemical and petrochemical plants for heat exchangers, tanks, and piping handling corrosive fluids, as well as in desalination plants and flue gas desulfurization units demanding high corrosion resistance.
What is the typical hardness of Super Duplex 2507?
The typical hardness for Super Duplex 2507 is around 310 on the Brinell scale (HBW). This relatively high hardness contributes to its excellent mechanical strength and resistance to wear and abrasion, though it also influences machining parameters, requiring robust tooling and procedures.
Can Super Duplex 2507 be welded?
Yes, Super Duplex 2507 can be successfully welded using appropriate procedures and matching filler metals (e.g., ER2594). Key considerations include minimizing heat input to prevent detrimental phase precipitation (like sigma phase) and using inert gas shielding. Low-temperature interpass control and avoidance of post-weld heat treatment, unless specifically required and carefully executed, are standard practices for maintaining the alloy's properties in Super Duplex 2507.
What are the main forms Super Duplex 2507 is available in India?
Super Duplex 2507 is commercially available in India in various forms to suit diverse industrial needs. These commonly include seamless and welded pipes, plates and sheets, round bars and rods, and a range of fittings such as elbows and tees. These forms allow for comprehensive fabrication in piping systems, structural components, and pressure vessels.
Frequently Asked Questions
What does this article on grade cover?+
Super Duplex 2507, a high-performance ferritic-austenitic stainless steel, is engineered for extreme environments. Its balanced microstructure, combining the best properties of both phases, offers exceptional strength and corrosion resistance, making it a critical material for de
Where can I buy grade online in India?+
You can buy grade and other metal products on MetaleMart.in — India's online marketplace for stainless steel, mild steel, copper, aluminium, brass, and more. Browse live rates, request custom sizes, and order with cut-to-length and doorstep delivery.
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