Duplex Stainless Steel Tube
Duplex stainless steel tube has a two-phase microstructure of austenite and ferrite, offering higher strength and better stress corrosion cracking resistance than ordinary austenitic stainless steel. It is widely used in marine, chemical, oil & gas and desalination industries with demanding corrosion environments.
Duplex Stainless Steel Tube
Seamless duplex stainless steel tube & pipe (2205 / 2507) for aggressive and high-strength service.
Product Overview
Duplex stainless steel seamless tube & pipe combines austenitic and ferritic structures in approximately equal proportions, offering the best of both families: good comprehensive mechanical properties with high strength and toughness, excellent resistance to pitting, crevice and stress corrosion cracking, good uniform corrosion resistance, and good weldability with low hot-cracking tendency.
Product Gallery
Key Features
- Approx. 50/50 austenitic-ferritic duplex structure
- High strength and high toughness
- Excellent pitting, crevice and stress-corrosion resistance
- Good weldability and low hot-cracking tendency
- Low thermal expansion, high thermal conductivity
- GB / ASTM / ASME compliant with mill certificates
Technical Specifications
| Standard | GB/T 21833; ASTM A789/ASME SA789, ASTM A790/ASME SA790 |
| Grades | S31500, S31803, S32205 (2205), S32750 (2507), S32790 |
| Microstructure | Austenitic-ferritic duplex structure (~50/50) |
| Properties | High strength, high toughness, excellent pitting, crevice and stress corrosion resistance; good weldability, low hot-cracking tendency |
| OD Range | Customizable |
| Wall Thickness | Customizable |
| NDT | Eddy current / hydraulic / ultrasonic testing |
| Applications | Methanol catalytic tube bundles, pulp & paper digesters, offshore & onshore oil/gas gathering lines, vinyl chloride condensers, crude oil desalter heat exchangers |
Grade Equivalents
| China GB (new / old) | UNS | EN / DIN |
|---|---|---|
| 022Cr19Ni5Mo3Si2N | S31500 | 1.4417 (RE60) |
| 022Cr22Ni5Mo3N | S31803 | 1.4482 |
| 022Cr23Ni5Mo3N | S32205 / 2205 | 1.4462 (SAF 2205) |
| 022Cr25Ni7Mo4N | S32750 / 2507 | 1.4410 (SAF 2507) |
| — | S32790 | — |
Sizes, wall thickness and lengths per customer specification.
Need a Custom Specification or a Quote?
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