Introduction to Super Duplex Stainless Steel Pipe
Super duplex stainless steel pipes incorporate high levels of chromium, molybdenum, and nitrogen, resulting in a unique microstructure. This chemical mix provides strong mechanical performance and corrosion resistance in tough industrial environments.
Super duplex stainless steel typically contains:
- Chromium (Cr): 24-26%, Nickel (Ni): 6-8%
- Molybdenum (Mo): 3-4%, Nitrogen (N): 0.3-0.5%
This composition provides a balanced mix of austenitic and ferritic phases, which enhances the material’s mechanical properties and corrosion resistance. The high chromium and molybdenum content offer excellent resistance to pitting and crevice corrosion, while the nitrogen content increases strength and improves resistance to stress corrosion cracking.
Stainless Steel Pipe Specification
| Procedure | Stainless Steel Welded pipe |
| Dimensions | 10.3mm and up 1372 |
| 1/8″ and up 54″ | |
| DN6 and up DN1350 | |
| Thickness | 1.24mm and 60mm |
| SCH 5S ~SCH XXS | |
| Unit Length | As per standard or customized |
| Standards | ASTM A312, A358, A790, A249,A270…… |
| JIS G3463, G3448, JIS3468…… | |
| EN 10217-7, EN10312…… | |
| GB/T12771, HG20537, GB/T24539, GB/T19228, CJ/T151, HG20537.4…… | |
| DIN17457…… | |
| Surface | Pickling |
| Hairline | |
| Polish | |
| End Type | Plain, Bevelled, Threaded, Grooved |
| Joint Method | Fitting, Flange, Welding, Thread |
| Pipe Machining | Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding |
| Procedure | Stainless Steel Seamless Pipe |
| Dimensions | 10.3mm and up 914 |
| 1/8″ and up 36″ | |
| DN6 and up DN900 | |
| Thickness | 1.24mm and 60mm |
| SCH 5S ~SCH XXS | |
| Unit Length | As per standard or customized |
| Standards | GB/T14975,GB/T14976,GB13296,GB5310…… |
| ASTM A312,A213,A269,A376,A511,A959,B677,ISO 15156-3…… | |
| DIN 17456,DIN 17458,EN10216-5…… | |
| JIS G3463,JIS G3459…… | |
| According to required specification is available. | |
| Surface | Pickling |
| Sand Blast | |
| Polish | |
| End Type | Plain, Bevelled, Threaded, Grooved |
| Joint Method | Fitting, Flange, Welding,thread |
| Pipe Machining | Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding |
Super Duplex Stainless Steel Main Grades
The main grades of super duplex steel vary based on their alloy composition and application environments. Common grades such as UNS S32750 (2507) and UNS S32760 (Zeron 100) are the most widely used in industry. Selecting the appropriate grade depends on the specific application environment, corrosive media, and mechanical performance requirements.
1. UNS S32750
Trade Name: 2507
Features: This is the most widely used grade of super duplex steel, with high chromium, molybdenum, and nitrogen content, offering exceptional corrosion resistance and mechanical properties.
Applications: Oil and gas, seawater treatment, chemical processing equipment.
2. UNS S32760
Trade Name: Zeron 100
Features: The addition of tungsten (W) further enhances corrosion resistance and strength, particularly in high-chloride environments.
Applications: Marine engineering, chemical processing, oil and gas extraction.
3. UNS S32550
Trade Name: 2550
Features: Contains moderate levels of chromium, molybdenum, and nitrogen, making it suitable for moderately corrosive environments while maintaining high strength.
Applications: Chemical processing equipment, pulp and paper industry.
Manufacturing Processing
Seamless Stainless Steel Pipe
Welded Stainless Steel Pipe
Welded Stainless Steel Pipe – JCO Process
Applications of Super Duplex Stainless Steel Pipe
About the application of 2507 duplex stainless steel pipe: it is used in ocean and energy engineering, such as high-pressure pipelines for ocean platforms, seabed pipelines, and seawater desalination equipment. There are also oil and gas extraction equipment, such as heat exchanger tubes and downhole tools.
In addition, duplex 2507 pipes are used in the chemical and environmental protection industries, such as corrosion-resistant pressure vessels for chemical reactors, storage tanks, and desalination equipment. Common water treatment systems, fire sprinkler systems, etc. Other industrial uses include paper-making machinery, food-processing equipment, gas-purification devices, and other environmental protection equipment.
Types of Packaging
Wooden Boxes
Wooden Pallet
Steel Box
Bundles
(Hexagonal or single tube)
