2507 Duplex Stainless Steel Round Bar
Grade: 2507/S32750 /S32760
Size:
Cold drawn: φ4mm-φ60mm
Hot Rolled: φ16mm-φ230mm
Forged: φ230mm-φ1200mm
Surface Finish: Black Annealed, Polished Bright, Centerless Grinding
Diameter Tolerance: H9, H11, h9, h11 etc
- Fast Shipping / Ready Stock
- ISO 9001 Direct Factory
- Custom Cutting & Processing
- 100% MTC & SGS Inspection Supported
2507 super duplex stainless steel is a high-alloy duplex stainless steel grade designated as UNS S32750 and UNS S32760. It is specifically developed for applications requiring extremely high corrosion resistance, superior mechanical strength, and excellent resistance to chloride-containing environments. The material combines the beneficial properties of austenitic and ferritic stainless steels through a balanced duplex microstructure consisting of approximately equal amounts of ferrite and austenite phases.
The alloy contains approximately 25% chromium, 4–8% nickel, and 3–5% molybdenum, along with nitrogen additions. The high chromium content provides outstanding resistance to general corrosion and oxidation, while molybdenum and nitrogen significantly enhance resistance to pitting and crevice corrosion. The high alloy content gives 2507 a very high Pitting Resistance Equivalent Number (PREN), typically above 40, making it suitable for severe chloride environments.
2507 super duplex stainless steel bars offer exceptional resistance to chloride stress corrosion cracking, erosion corrosion, and localized corrosion. Compared with 2205 duplex stainless steel, 2507 provides higher strength and improved corrosion resistance, allowing it to perform reliably in seawater, offshore, and aggressive chemical environments. The duplex structure provides yield strength approximately twice that of conventional austenitic stainless steels such as 304 and 316.
2507 stainless steel bars are normally supplied in solution annealed condition to maintain the optimum ferrite-austenite phase balance. Proper heat treatment and welding procedures are essential to preserve corrosion resistance and mechanical properties. The material provides excellent fatigue strength, good toughness, and long service life in demanding industrial environments.
Due to its outstanding corrosion resistance and mechanical performance, 2507 super duplex stainless steel bars are widely used in offshore oil and gas equipment, seawater desalination plants, chemical processing equipment, marine engineering, heat exchangers, pressure vessels, pumps, valves, and high-pressure piping systems.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S32750/S32760 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S32750/S32760 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A182 – UNS S32750/S32760 | Forged Stainless Steel Components |
| UNS | S32750 | 2507 Super Duplex Stainless Steel |
| UNS | S32760 | Zeron 100 Super Duplex Stainless Steel |
| JIS | JIS G4303 SUS32750 (Comparable) | Duplex Stainless Steel Bars |
| EN | EN 10088-3 1.4410 | X2CrNiMoN25-7-4 Stainless Steel |
| DIN | DIN 1.4410 | Equivalent European Material Designation |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1020–1125°C followed by rapid cooling |
| Microstructure | Approximately 40–60% Ferrite + Austenite Balance |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Mechanical Testing, Ferrite Content Testing, Corrosion Testing |
| Supply Condition | Solution Annealed Condition |
Chemical Composition (%)
UNS S32750 / UNS S32760 Typical Composition
| Element | Composition Requirement |
| 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 |
| Tungsten (W) | ≤ 1.00 (S32760) |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 795 MPa |
| Yield Strength (0.2% Offset) | ≥ 550 MPa |
| Elongation | ≥ 15% |
| Hardness | ≤ 310 HB |
| Impact Toughness | Excellent at Low Temperature |
| Ferrite Content | Typically 40–60% |
| Industry | Applications |
| Offshore Oil & Gas | Offshore platforms, subsea equipment, risers, pipelines |
| Marine Engineering | Seawater systems, marine structures, propeller components |
| Desalination Industry | High-pressure seawater pumps, reverse osmosis equipment |
| Chemical Industry | Reactors, storage tanks, heat exchangers |
| Petrochemical Industry | Process piping, pressure vessels, valves |
| Power Generation | Cooling systems, flue gas treatment equipment |
| Pulp & Paper Industry | Bleaching equipment, digesters, process piping |
2507 super duplex stainless steel is a high-alloy duplex stainless steel grade designated as UNS S32750 and UNS S32760. It is specifically developed for applications requiring extremely high corrosion resistance, superior mechanical strength, and excellent resistance to chloride-containing environments. The material combines the beneficial properties of austenitic and ferritic stainless steels through a balanced duplex microstructure consisting of approximately equal amounts of ferrite and austenite phases.
The alloy contains approximately 25% chromium, 4–8% nickel, and 3–5% molybdenum, along with nitrogen additions. The high chromium content provides outstanding resistance to general corrosion and oxidation, while molybdenum and nitrogen significantly enhance resistance to pitting and crevice corrosion. The high alloy content gives 2507 a very high Pitting Resistance Equivalent Number (PREN), typically above 40, making it suitable for severe chloride environments.
2507 super duplex stainless steel bars offer exceptional resistance to chloride stress corrosion cracking, erosion corrosion, and localized corrosion. Compared with 2205 duplex stainless steel, 2507 provides higher strength and improved corrosion resistance, allowing it to perform reliably in seawater, offshore, and aggressive chemical environments. The duplex structure provides yield strength approximately twice that of conventional austenitic stainless steels such as 304 and 316.
2507 stainless steel bars are normally supplied in solution annealed condition to maintain the optimum ferrite-austenite phase balance. Proper heat treatment and welding procedures are essential to preserve corrosion resistance and mechanical properties. The material provides excellent fatigue strength, good toughness, and long service life in demanding industrial environments.
Due to its outstanding corrosion resistance and mechanical performance, 2507 super duplex stainless steel bars are widely used in offshore oil and gas equipment, seawater desalination plants, chemical processing equipment, marine engineering, heat exchangers, pressure vessels, pumps, valves, and high-pressure piping systems.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S32750/S32760 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S32750/S32760 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A182 – UNS S32750/S32760 | Forged Stainless Steel Components |
| UNS | S32750 | 2507 Super Duplex Stainless Steel |
| UNS | S32760 | Zeron 100 Super Duplex Stainless Steel |
| JIS | JIS G4303 SUS32750 (Comparable) | Duplex Stainless Steel Bars |
| EN | EN 10088-3 1.4410 | X2CrNiMoN25-7-4 Stainless Steel |
| DIN | DIN 1.4410 | Equivalent European Material Designation |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1020–1125°C followed by rapid cooling |
| Microstructure | Approximately 40–60% Ferrite + Austenite Balance |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Mechanical Testing, Ferrite Content Testing, Corrosion Testing |
| Supply Condition | Solution Annealed Condition |
Chemical Composition (%)
UNS S32750 / UNS S32760 Typical Composition
| Element | Composition Requirement |
| 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 |
| Tungsten (W) | ≤ 1.00 (S32760) |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 795 MPa |
| Yield Strength (0.2% Offset) | ≥ 550 MPa |
| Elongation | ≥ 15% |
| Hardness | ≤ 310 HB |
| Impact Toughness | Excellent at Low Temperature |
| Ferrite Content | Typically 40–60% |
| Industry | Applications |
| Offshore Oil & Gas | Offshore platforms, subsea equipment, risers, pipelines |
| Marine Engineering | Seawater systems, marine structures, propeller components |
| Desalination Industry | High-pressure seawater pumps, reverse osmosis equipment |
| Chemical Industry | Reactors, storage tanks, heat exchangers |
| Petrochemical Industry | Process piping, pressure vessels, valves |
| Power Generation | Cooling systems, flue gas treatment equipment |
| Pulp & Paper Industry | Bleaching equipment, digesters, process piping |
