Duplex Stainless Steel Pipe
Duplex stainless steel pipe is centrifugal stainless steel pipe made of duplex stainless steel.
Navigation Table
Duplex stainless steel pipe grades
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N |
| SAF Duplex 2205 | 0.03 | 2.00 | 1.00 | 0.04 | 0.03 | 21.0-24.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| SAF Duplex 2304 | 0.03 | 1.20 | 0.50 | 0.04 | 0.04 | 23.0 | 4.5 | – | 0.10 |
| SAF Duplex 2507 | 0.03 | 1.20 | 0.80 | 0.035 | 0.02 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.35 |
| AISI Duplex 329 | 0.08 | 1.00 | 0.75 | 0.04 | 0.03 | 23.0-28.0 | 2.0-5.0 | 1.0-2.0 | – |
| Duplex 3RE60 | 0.03 | 1.0-2.0 | 1.3-2.0 | 0.035 | 0.03 | 18.0-19.5 | 4.5-5.5 | 2.5-3.0 | 0.05-0.12 |
Duplex stainless steel pipe specifications
| Specifications | ASTM A789, ASTM A790 |
| Standards | ASTM, ASME |
| Diameters | Up to 1500 mm |
| Lengths | Up to 6500 mm |
| Castings | Up to 9000 KG |
| Types | Duplex steel pipe |
| Thinkless | Up to 1500 mm |
| Process | Centrifugal casting |
Advantages
Duplex stainless steel vs Austenitic stainless steel
Good plasticity and toughness
The duplex stainless steel has good plasticity and toughness. The wall thickness of storage tank made of duplex stainless steel(DSS) is 30% to 50% less than that of austenitic stainless steel.
Better wear resistance corrosion and corrosion fatigue properties
The wear resistance corrosion and corrosion fatigue properties of duplex stainless steel are better than those of austenitic stainless steel.
Low coefficient of linear expansion
The coefficient of linear expansion of duplex steel pipes is lower than that of austenitic stainless steel and is close to that of carbon steel pipe.
higher energy absorption capacity
It has a higher energy absorption capacity than austenitic stainless steel tube.
Better resistance
Duplex steel has better resistance to stress corrosion cracking.
Duplex stainless steel vs Ferritic stainless steel
Higher flexibility
duplex stainless steel pipe flexibility is higher than that of ferritic stainless steel pipe, and it is not as sensitive as ferritic stainless steel.
Better corrosion resistance
The local corrosion resistance is better than that of ferritic stainless steel.
Better cold working process and cold forming performance
The cold working process performance and cold forming performance of duplex steel are much better than that of ferritic stainless steel pipe.
Better weldability
The weldability is also better than that of ferritic stainless steel.
Applications
① Due to its excellent corrosion resistance, duplex stainless steel pipe is widely used in petroleum, chemical, medical, food, light industry, mechanical instrument and other fields.
② When the bending and torsion strength are the same, the weight is lighter. Therefore, duplex stainless steel is widely used to manufacture mechanical parts and engineering structures.
③ Because of its unique advantages, it is widely used in the fields of paper-making, oil and gas treatment, and so on.
