What is 1.4410 Super Duplex Pipe?
1.4410 super duplex stainless steel pipe (commonly referred to as SAF 2507) is a high-performance, corrosion-resistant alloy with a microstructure consisting of 50% austenite and 50% ferrite. It possesses exceptional strength approximately double that of standard austenitic stainless steels-and demonstrates superior resistance to pitting and crevice corrosion in chloride-rich environments, such as seawater. It is widely utilized in sectors including oil and gas, seawater desalination, and chemical processing.
What is the equivalent grade of 1.4410?
1.4410 Super duplex stainless steel is the most widely used super duplex stainless steel grade. This grade is written as 1.4410 or X2CrNiMoN25-7-4 according to EN norm and it is written as UNS S32750 of SAF 2507 or F53 according to UNS norm. We can think that 1.4410 is a better version of 1.4462 duplex grade.
What is the standard of 1.4410 pipe?
1.4410 piping belongs to the super duplex stainless steel family. Its primary standard specifications include ASTM A790 and EN 1.4410 (X2CrNiMoN25-7-4) for welded and seamless pipes, as well as A182 F53, which is commonly used for forged components.
Chemical Properties Of S32750 Super Duplex Steel Pipe
|
UNS Designation |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
N |
Cu |
|
max |
max |
max |
max |
max |
||||||
|
1.4410 |
0.03 |
0.8 |
1.2 |
0.035 |
0.02 |
24.0 - 26.0 |
6.0 - 8.0 |
3.0 - 5.0 |
0.24 - 0.32 |
0.5 max |
1.4410 Stainless Steel Tube Mechanical Properties
| Property (room temperature) | Typical value |
|---|---|
| Density | 7.8 – 7.9 g/cm³ |
| Melting point | 1350 – 1450 °C |
| Thermal conductivity | ~13.5 W/m·K |
| Coefficient of thermal expansion | 13 – 14 × 10⁻⁶ /K (20–200 °C) |
| Yield strength Rp0.2 | ≥ 550 MPa (bars and plates) |
| Tensile strength Rm | 750 – 1000 MPa |
| Elongation | ≥ 25 % |
| Hardness | ≤ 300 HB (≤ 32 HRC) |
| Impact toughness | ≥ 45 J at –46 °C |
1.4410 Stainless Steel Tube: Corrosion Resistance
1.4410 stainless steel tube, also known as Super Duplex 2507 tube, offers exceptional corrosion resistance due to its high chromium (25%), molybdenum (4%), and nitrogen content. Its Pitting Resistance Equivalent Number (PREN) exceeds 40, providing outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking in seawater and highly acidic environments. Compared with 316L stainless steel, 1.4410 delivers more than twice the corrosion resistance performance in chloride-containing applications.
1.4410 Stainless Steel Tube: Machinability
Although 1.4410 stainless steel tubes provide extremely high strength, their machinability is relatively lower than standard austenitic stainless steels because of the duplex microstructure and high hardness. The material typically exhibits a yield strength above 550 MPa, requiring rigid tooling, low cutting speeds, and sufficient cooling during machining. Carbide tools are generally recommended to improve cutting efficiency and reduce tool wear during turning, drilling, and threading operations.
1.4410 Stainless Steel Tube: Weldability
1.4410 stainless steel tubes have excellent weldability when proper welding procedures are followed. Common welding methods include TIG, MIG, plasma welding, and submerged arc welding. To maintain the balanced ferrite-austenite microstructure, heat input is usually controlled between 0.5–2.5 kJ/mm. Post-weld heat treatment is generally unnecessary, while suitable filler materials such as ER2594 are recommended to preserve corrosion resistance and mechanical strength.
1.4410 Stainless Steel Tube: Applications
Due to its superior strength and corrosion resistance, 1.4410 stainless steel tube is widely used in offshore platforms, seawater desalination systems, petrochemical plants, heat exchangers, pressure vessels, and subsea pipelines. Its tensile strength can reach 800–1000 MPa, making it highly suitable for harsh industrial environments where both mechanical performance and long-term corrosion resistance are critical.
1.4410 Stainless Steel Tube Price per Ton
The price of 1.4410 stainless steel tubes generally ranges from USD 6,000 to USD 12,000 per ton, depending on tube size, wall thickness, manufacturing process, and market nickel and molybdenum prices. Seamless tubes and precision cold-drawn tubes are typically more expensive than welded tubes due to their stricter production requirements and higher dimensional accuracy. Customized processing services such as polishing, pickling, and cut-to-length fabrication may also increase the final quotation.
If you have project-specific requirements for 2507 (1.4410) stainless steel pipes, we invite you to place an order. GNEE maintains a substantial inventory of popular products available for your selection. These pipes are available in both seamless and welded forms; for detailed chemical compositions or to request free samples, please contact our facility immediately. We offer competitive pricing and exceptional service.
