As the duplex and super duplex stainless steel has both the advantages of ferritic stainless steel and the austenitic stainless steel, they are widely used to produce heat transferring tubing for petrochemical industry,sea water treatment…. in aggressive acidic, chloride containing environments. GNEE STEEL supply customer duplex/super duplex tubes with high quality.
Products introduction
It has good corrosion resistance with high strength. Content of Cr is between 18%-28% and Ni is 3%-10% in the condition of low C. Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc
Duplex Tube and Super Duplex Pipe Typical Grade and Composition: UNS S31803, S32205, S32750,S32760..
Duplex Tube and Super Duplex SS Pipe Applications: Heater, Heat Exchanger, Condenser, instrumentation, Pipe lines..
Duplex Tube and Super Duplex SS Tube/Pipe Available Specifications:
- ASTM/ASME ASA789 Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
- ASTM/ASME A/SA790 Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
Advantage Of Duplex And Super Duplex Stainless Steel Tube From GNEE STEEL
1. Superior resistance to general and local corrosion, especially to stress corrosion, pitting corrosion, crevice corrosion, corrosion fatigue and abrasion & corrosion
2. Good weldability
3. Good mechanical properties
4. Excellent intergranular corrosion resistance
5. High cost-effectiveness, long life time
Chemical Content of Typical Duplex Stainless Steel
| Grade | Mn | P | S | Si | Cr | Ni | Mo | N | Cu | |
| UNS S32101 | 0.03max. | 2.0max. | 0.03max. | 0.030max. | 1.0max. | 20.0-23.0 | 1.0-3.0 | 0.6max. | 0.05-0.17 | 1.0max. |
| UNS S32304 | 0.03max. | 2.5max. | 0.04max. | 0.040max. | 1.0max. | 21.5-24.5 | 3.0-5.5 | 0.05-0.6 | 0.05-0.20 | 0.05-0.6 |
| UNS S31803 | 0.03max. | 2.0max. | 0.03max. | 0.020max. | 1.0max. | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.2 | |
| UNS S32205 | 0.03max. | 2.0max. | 0.03max. | 0.020max. | 1.0max. | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.2 | |
| UNS S32750 | 0.03max. | 1.5max. | 0.035max. | 0.020max. | 0.8max. | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 0.5max. |
| UNS S32760 | 0.05max. | 1.0max. | 0.030max. | 0.010max. | 1.0max. | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.2-0.30 | 0.5-1.0 |
| UNS S32707 | 0.03max. | 1.5max. | 0.035max. | 0.010max. | 0.5max. | 29.0-29.0 | 5.5-9.5 | 4.0-5.0 | 0.3-0.50 | 1.0max. |
Available Sizes
| Products | OD | WT | Length | |||
| ln ch | MM | Inch | MM | Ft max. | Mmax. | |
| Tube | 1/2"-3" | 12.0-76.2 | 0.02"-0.5" | 0.5-12.0 | 105' | 32.00 |
| Pipe | NPS 1/2"-36" | 21.34-914.4 | SCH10S-SCH80S | 2.11-12.7 | 98' | 30.00 |
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