Newzel Industries made a name for itself by welding complicated and hard-to-control corrosion-resistant alloys precisely. Duplex stainless steel may seem easy to weld, but its properties may make it hard to do so. Problems often happen when the weld doesn’t have the right mix of austenitic and ferrite to be strong, durable, and resistant to corrosion.

What does duplex mean?

Duplex is a type of stainless steel that has qualities of both austenitic and ferritic. The ferritic phase makes the metal strong, while the austenitic lattice gives it tensile strength and the ability to bend.

Duplex stainless steels have a high yield strength because they are made of two different parts. In fact, austenitic grades are almost half as strong as duplex grades.

Because it has a different structure in different places, the duplex is resistant to both stress corrosion cracking and intergranular corrosion, but it is still flexible enough to bend. Also, the low amount of nickel in the duplex and its high strength makes it possible to use thinner sections, which saves the end user a lot of money.

Markets for Duplexes

People know that duplex stainless steel can stand up to even the harshest conditions. Because of this, they are the best choice for industries like desalination, water management, oil and gas, industrial machinery, transportation, and design and construction.

1. Water Treatment and Desalination

For desalination and water treatment, you need a durable material that can stand up to the corrosive effects of water, salt, and other liquids. You are looking at duplexed stainless steel. Due to its high strength, resistance to corrosion, long life span, and low cost, the benefits of using duplex stainless steel far outweigh the costs of the initial investment.

2. Petroleum and Natural Gas

The oil and gas industry needs a material that is strong, resistant to corrosion, and easy to work with. Duplex stainless steel is the best choice for everything.

Due to its high resistance and durability against chloride stress corrosion cracking, duplex stainless steel is especially good for offshore applications that work at high pressures and deep depths. Duplex is also often used for onshore pipelines that transport corrosive materials. Because of this, the oil and gas industry continues to use the most duplex stainless steel.

3. Transportation

Getting things and people, where they need to go, is important for many parts of society. Duplex stainless steel are used in boats, planes, trains, and cars, among other ways of getting around.

Truck tanks and trailers made of this high-strength stainless steel, for example, have unbeatable strength, durability, and resistance to corrosion. They are also cheaper than traditional choices made of carbon steel.

Duplex stainless steel is used for everything from the hull of a ship to the chemical tanks and cargo containers that these ships carry. They are also used in machines that clean up exhaust.

Even the rail industry is using duplex stainless steel, taking advantage of its low power use and resistance to corrosion to make passenger waggons safer.

4. Equipment

Due to its strength, durability, and ease of cleaning, Duplex seems to be the material of choice for many types of industrial equipment, such as food and drink storage containers, pipelines, tanks, pressure vessels, and heat exchangers. Duplex stainless steel storage containers don’t rust and don’t need much or any maintenance because they are so strong. Duplex stainless steel doesn’t rust, so it doesn’t need a coating to protect it. This makes it cheaper than other materials that don’t last as long.

Duplex stainless steel is often used in the pulp and paper industry because it is resistant to corrosion and strong.

5. Construction & Building

Duplex stainless steels are changing the way buildings are designed. These grades are great for roofs, walls, and bridges because they have a unique combination of durability and good looks.

Duplex stainless steels have the freedom of shape and aesthetic flexibility needed to fit into a wide range of situations and styles of architecture. Stainless steel lasts a long time, is easy to keep up with, and can be recycled. It can also be used in many different building technologies.

In the same way, duplex stainless steel can be found in all or part of car and pedestrian bridges, including railings and bannisters, suspension bridge wires, cables, and tie rods.

Information about our Duplex Steel products:

Duplex Steel Pipes & Tubes:-


StandardASTM / ASME SA 790. SA 789, SA 790
GradeUNS NO. S 31803, S 32205
LengthSingle Random, Cut Length
EndPlain 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:-

Chemical Composition of Duplex Stainless Steel Butt weld Fittings

S318030.030 max2.00 max1.00 max0.030 max0.02022.00 – 23.003.00 – 3.54.50 – 6.500.14 – 0.2063.72 min
S322050.030 max2.00 max1.00 max0.030 max0.020 max21.00 – 23.002.50 – 3.504.50 – 6.500.20 – 0.2063.54 min

Mechanical Properties of Duplex Steel Butt weld Pipe Fittings

GradesDensity (g/cm 3)Density (lb/in 3)Melting Point (°C)Melting Point (°F)
S31803 / S322057.8050.2851420-1465/p>2588-2669

Chemical Composition of Duplex Steel High-Pressure Fittings

S318030.030 max2.00 max1.00 max0.030 max0.020 max22.00 – 23.003.00 – 3.54.50 – 6.500.14 – 0.2063.72 min
S322050.030 max2.00 max1.00 max0.030 max0.020 max21.0 – 23.02.50 – 3.504.50 – 6.500.8 – 0.2063.54 min

Mechanical Properties of Duplex Steel Forged Pipe Fittings

GradesDensity (g/cm 3)Density (lb/in 3)Melting Point (°C)Melting Point (°F)
S31803 / S322057.8050.2851420 – 14652588 – 2669


Our wide range of products that are always changing makes it easy for us to meet our client’s urgent application needs. We also have a product pipeline that is the best in the industry and is full of applications that will help shape the future.

However, Newzel Industries is more than just a manufacturer. We are confident that your confidence in our products will ultimately determine our success. As a result, we offer all of our client’s technical assistance and product co-development.

Due to their lower nickel and molybdenum content, Duplex Stainless Steels are less expensive per pound than austenitic grades with equivalent corrosion resistance. Additionally, duplex grades are almost twice as durable as regular grades, resulting in material savings from reduced wall thickness requirements. This results in less metal at a lower price per pound.

Contact us for more details about Duplex stainless steel

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