Newzel Industries built a reputation for precise welding of complex, difficult-to-manage corrosion-resistant metals. While welding Duplex Stainless Steel may appear to be straightforward, its welding characteristics might be problematic. Difficulties sometimes develop when the weld lacks the necessary austenitic/ferrite composition to offer the appropriate durability, tenacity, and corrosion resistance.
What exactly is Duplex?
Duplex stainless steel has both austenitic and ferritic properties. The ferritic phase provides strength, whereas the austenitic lattice provides tensile strength and ductility.
Duplex stainless steels offer excellent yield strength due to their two-phase structure. Duplex stainless steels have nearly double the strength of austenitic grades.
Duplex offers strong resistance to stress corrosion cracking and intergranular corrosion because to its heterogeneous structure, while yet retaining sufficient ductility. Furthermore, the low nickel content and high strength of duplex enable for the use of thinner sections, which results in significant cost savings for the end user.
Markets for Duplexes
Duplex stainless steels are well-known for their ability to withstand extreme environments. As a result, they are the ideal material in the desalination, water management, oil and gas, industrial machinery, transportation, and design and building sectors.
1. Water Treatment and Desalination
Desalination and water treatment applications require a long-lasting material that can withstand the corrosive effects of water, liquids, and salt. You are looking at duplexed stainless steel. The benefits of using duplex stainless steel far surpass the initial investment costs because of its superior strength, corrosion resistance, long life, and cost-effectiveness.
2. Petroleum and natural gas
The oil and gas industry demands a material that is highly corrosion-resistant, adaptable, and strong. Duplex stainless steel satisfies all of the specifications.
Duplex stainless steel is ideal for offshore applications that operate at high pressures and depths because to its strong resistance and endurance to chloride stress corrosion cracking. Duplex is also a common material for onshore pipes that transport corrosive liquids. As a result, the oil and gas industry remains the largest consumer of duplex stainless steel.
3. Transportation
Several sectors of civilization rely on an effective system for transporting goods and people. Duplex stainless steels are utilized in a variety of applications, including boats, aircraft, trains, and vehicles.
Truck tanks and trailers constructed with such high-strength stainless steel, for example, benefit from unparalleled effectiveness, endurance, and corrosion resistance. They also cost less than standard carbon steel options.
Duplex stainless steels are used in a variety of applications, including ship hulls, chemical tanks, and cargo containers. They are also found in exhaust scrubbers.
Even the train sector is utilizing duplex stainless steel, leveraging its superior power consumption and corrosion resistance to improve passenger waggon safety.
4. Equipment
Duplex appears to have become the ideal material for a wide range of industrial equipment, including food and beverage storage containers, pipelines, tanks, pressure vessels, and heat exchangers, due to its strength, longevity, and simplicity of maintenance. Duplex stainless steel storage containers last a lifetime because to their exceptional corrosion resistance and require little to no maintenance. Duplex stainless steel is also corrosion resistant, thus it does not require a protective covering, making it more cost-effective than other, less durable materials.
Because of its corrosion resistance and mechanical strength, duplex stainless steel is widely used in the pulp and paper industry.
5. Construction & Building
Duplex stainless steel is redefining architectural design options. These grades are ideal for roofs, façades, and bridges because of their unique combination of durability and aesthetic appeal.
Duplex stainless steels provide the form freedom and aesthetic flexibility needed to fit into a wide range of situations and architectural styles. Stainless steel is not only durable, easy to maintain, and recyclable, but it can also be used with a variety of building technologies.
Similarly, duplex stainless steel may be found in all or parts of vehicle and pedestrian bridges, such as railings and bannisters, suspension bridge wires, cables, and tie rods.
Insights on our Duplex Steel products:
Duplex Steel Pipes & Tubes
Specifications
| Standard | ASTM / ASME SA 790. SA 789 , SA 790 |
| Grade | UNS NO. S 31803, S 32205 |
| Type | SEAMLESS / ERW / WELDED/ FABRICATED |
| Length | Single Random, Cut Length |
| End | Plain End, Bevelled End, Threaded |
Types of Duplex Steel Pipes & Tubes :
Duplex Steel UNS S31803 Pipes and Tubes
Duplex Steel UNS S32205 Pipes and Tubes
Duplex Steel Buttweld Fittings
Duplex Steel S31803 Buttweld Fittings
Duplex Steel S32205 Buttweld Fittings
Chemical Composition of Duplex Stainless Steel Buttweld Fittings.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 | 22.00 – 23.00 | 3.00 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.00 – 23.00 | 2.50 – 3.50 | 4.50 – 6.50 | 0.20 – 0.20 | 63.54 min |
Mechanical Properties of Duplex Steel Buttweld Pipe Fittings.
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420-1465/p> | 2588-2669 |
Conclusion
Our varied and ever-changing product range is well-suited to satisfy our clients’ urgent application needs. In addition, we have an industry-leading product pipeline brimming with applications that will impact the future.
However, Newzel Industries represents more than just things. We are confident that your faith in our products will ultimately decide our success. As a consequence, we offer technical support and product co-development to all of our customers.
Newzel Industries also has the expertise and knowledge to guarantee that each weld is flawless. Because of our extensive experience working with reactive metals, Newzel Industries is the best choice for all of your Duplex Stainless Steel requirements.
When compared to austenitic grades with equivalent corrosion resistance, duplex stainless steels cost less per pound because they contain less nickel and molybdenum. Duplex grades are also roughly twice as strong as regular grades, resulting in material savings owing to wall thickness requirements. This suggests using less metal at a lower per-pound cost.
