Understanding the Applications & Uses of Duplex Stainless Steels
Posted on November 24, 2021 at 5:20 PM
Amardeep Steel established a reputation for precision welding of complicated and difficult-to-manage corrosion-resistant alloys. While welding Duplex Stainless Steel may seem to be simple, its welding properties might be challenging. Difficulties often arise when the weld lacks the required austenitic/ferrite composition to provide the desired durability, tenacity, and corrosion resistance.
What exactly is Duplex?
Duplex is a stainless steel type that has a combination of austenitic and ferritic characteristics. The ferritic phase gives strength, whereas the austenitic lattice offers tensile strength and ductility.
Duplex stainless steels have a high yield strength due to their two-phase structure. Duplex stainless steels, in fact, are almost twice as strong as austenitic grades.
Because of its heterogeneous structure, duplex has high resistance to both stress corrosion cracking and intergranular corrosion while preserving enough ductility. Additionally, the low nickel content and high strength of duplex allow for the use of thinner sections, resulting in considerable cost savings for the end user.
Markets for Duplexes
Duplex stainless steels are well-known for their ability to survive even the harshest conditions. As a result, they are the preferred material in the desalination, water management, oil and gas, industrial machinery, transportation, and design & construction industries.
1. Water Treatment and Desalination
Desalination and water treatment applications need the use of a long-lasting material that can resist the corrosive nature of water, liquids, and salt. You're looking at stainless steel that's been duplexed. The advantages of adopting duplex stainless steel significantly outweigh the original investment expenses due to its exceptional strength, corrosion resistance, extended life-span, and cost efficiency.
2. Petroleum and natural gas
The oil and gas sector requires a material with high corrosion resistance, adaptability, and strength. Duplex stainless steel meets all of the requirements.
Because of its high resistance and durability to chloride stress corrosion cracking, duplex stainless steel is especially well-suited for offshore applications that operate at high pressures and extreme depths. Duplex is also a popular material for onshore pipelines carrying corrosive substances. As a result, the oil and gas sector remains the greatest consumer of duplex stainless steels.
3. Transportation
Several areas of civilization rely on an efficient system for carrying products and people. Duplex stainless steels are used in many modes of transportation, including boats, planes, trains, and automobiles.
Truck tanks and trailers built of such high-strength stainless steels, for example, profit from unrivalled effectiveness, endurance, and corrosion resistance. They are also less expensive than traditional carbon steel choices.
Duplex stainless steels are employed in everything from the hull of a ship to the chemical tanks and cargo containers that these ships transport. They're also found in exhaust scrubber apparatus.
Even the rail industry is using duplex stainless steel, leveraging its exceptional power consumption and corrosion resistance to enhance the safety of passenger waggons.
4. Equipment
Duplex seems to have become the preferred material for a variety of industrial equipment, including food and beverage storage containers, pipelines, tanks, pressure vessels, and heat exchangers, due to its strength, durability, and ease of cleaning. Duplex stainless steel storage containers last a lifetime due to its superior corrosion resistance and need little to no maintenance. Duplex stainless steel is also resistant to corrosion, which means that it doesn't need a protective layer, making it more cost-effective than other, less lasting materials.
Because of its corrosion resistance and mechanical strength, duplex stainless steel is frequently utilised in the pulp and paper sector.
5. Construction & Building
Duplex stainless steels are revolutionising architectural design possibilities. These grades are especially well-suited for roofs, façades, and bridges because to their unique mix of durability and aesthetic appeal.
Duplex stainless steels give the form freedom and aesthetic flexibility required to integrate into a variety of contexts and architectural styles. Stainless steel is not only long-lasting, simple to maintain, and recyclable; it can also be employed with a wide range of building technologies.
Similarly, duplex stainless steel may be found in all or any portion of car and pedestrian bridges, including railings and bannisters, suspension bridge wires, cables, and tie rods.
Insights on our Duplex Steel products:-
Duplex Steel Pipes & Tubes:-
Specification :
|
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:-
Chemical Composition of Duplex Stainless Steel Butt weld 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 Butt weld 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 |
Duplex Steel Plates, Sheets and Coils:-
Specification :
|
Range |
1 MM TO 200 MM THK IN 1000 MM TO 3000 MM WIDTH x 2500 MM / 5000 MM / 10000 MM / COIL. |
|
Standard |
ASTM/ASME A240 |
|
Grade |
UNS S31803, S32205, S32550, S32750, S32760 |
|
Length |
Single Random, Cut Length |
|
End |
Plain End, Bevelled End, Threaded |
|
STANDARD |
WERKSTOFF NR. |
UNS |
|
Duplex 2205 |
1.4462 |
S31803 / S32205 |
Duplex Steel Bars, Rods & Wires:-
Specification :
|
Size |
10 mm To 100 mm Dia in 100 mm TO 6000 mm Length. |
|
Standard |
ASTM A276, A479 / ASME SA276, SA479, ASTM A789 / A789M & ASTM A928 / A928M |
|
Grade |
UNS NO. S 31803, S 32205, S 32550, S 32750, S 32760. |
|
Finish |
Bright, Polish & Black |
|
End |
Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wire-mesh, Billet, Ingot, Forging Etc. |
|
STANDARD |
WERKSTOFF NR. |
UNS |
|
Duplex 2205 |
1.4462 |
S31803 / S32205 |
Duplex Steel Forged Fittings:-
Specification :
|
Size |
1/2"NB TO 4"NB IN |
|
Standard |
ASTM A182 / ASME SA182 |
|
Dimensions |
ANSI/ASME B16.11 & BS3799, etc. |
|
Grade |
UNS S31803, S32205, S2205, S32550, S32750, S32760. |
|
Class |
2000LBS, 3000LBS, 6000LBS, 9000LBS, etc. |
|
Type |
Socket Weld (S/W) & SCREWED (SCRD) – NPT, BSP, BSPT, Threaded Fittings |
|
STANDARD |
WERKSTOFF NR. |
UNS |
|
Duplex 2205 |
1.4462 |
S31803 / S32205 |
Chemical Composition of Duplex Steel High Pressure 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 max |
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 |
21.0 – 23.0 |
2.50 - 3.50 |
4.50 – 6.50 |
0.8 – 0.20 |
63.54 min |
Mechanical Properties of Duplex Steel Forged 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 |
2588 – 2669 |
Summary:-
Our diverse and ever-changing product selection is well-positioned to meet our clients' urgent application requirements. In addition, we have an industry-leading product pipeline full of applications that will help shape the future.
Amardeep Steel, however, is more than simply goods. We are certain that our success is ultimately determined by your trust in our goods. As a result, we provide technical help and product co-development to all of our clients.
Amardeep Steel also has the skills and understanding to ensure that every weld is perfect. Amardeep Steel is the finest option for all of your Duplex Stainless Steel needs due to our strong track record with reactive metals.
Duplex Stainless Steels have a cheaper cost per pound due to their reduced nickel and molybdenum content when compared to austenitic grades with comparable corrosion resistance. Duplex grades are also about twice as robust as standard grades, resulting in material savings due to wall thickness requirements. This implies less metal at a reduced per-pound cost.
Fore more information regarding stainless steel, contact us