Calico Metal Alloys LLP is a reputable supplier and exporter of Duplex Steel UNS S31803 Pipes in India. Among our top offerings are Duplex Steel UNS S31803 Pipes, known for their exceptional strength, corrosion resistance, and versatility. We pride ourselves on delivering high-quality products that meet stringent industry standards, making us a trusted partner for various applications in sectors such as construction, oil and gas, and manufacturing. With a commitment to reliability and customer satisfaction, we stand out as a premier source for premium-grade duplex steel pipes in the Indian market.

What is Duplex Steel UNS S31803 Pipes?

Duplex Steel UNS S31803 Pipes are a type of stainless steel pipes known for their excellent corrosion resistance and high strength. They are composed of a balanced microstructure of austenite and ferrite phases, offering superior toughness and durability. These pipes are widely used in various industries such as chemical processing, oil and gas, and marine applications due to their exceptional performance in harsh environments.

Duplex Steel UNS S31803 Plates

Manufacturing Process Of Duplex S31803 Plates

Reheating Furnace

Reheating furnaces are used in hot rolling mills to heat the steel stock to the rolling temperatures.

Scale Breaker

Slab moves first through a scale breaker, which is a two-high rolling mill with vertical rolls that loosens the furnace scale and removes it with high-pressure water jets.

Finish Rolling

The last stage of the rolling process is cold rolling,


Cooling or Quenching is a process of cooling a metal at a rapid rate.

Skin Pass Mill

This produces high-gloss surfaces and achieves the desired mechanical strip properties such as deep-drawing strength.

Marking & Packing

Proper packaging and labeling not only makes the final product look attractive but also save a huge amount of money by saving the product from wrong handling.

Advantages of Duplex Steel UNS S31803 Pipes

Duplex Steel UNS S31803 pipes offer numerous advantages due to their unique composition and properties. Here are some of the key advantages:

Corrosion Resistance: One of the most significant advantages of Duplex Steel UNS S31803 pipes is their excellent resistance to corrosion, particularly in harsh environments such as those containing chloride ions. This makes them suitable for use in offshore and marine applications, as well as in chemical processing industries.

High Strength: Duplex Steel UNS S31803 pipes have higher strength compared to austenitic or ferritic stainless steels, allowing for the design of lighter and more compact piping systems without sacrificing structural integrity.

Good Toughness and Ductility: These pipes exhibit good toughness and ductility even at low temperatures, making them suitable for use in cryogenic applications.

High Resistance to Stress Corrosion Cracking (SCC): Duplex steels, including UNS S31803, have superior resistance to stress corrosion cracking, which is a common issue in many corrosive environments.

Cost-Effective: While duplex stainless steels may have a higher initial cost compared to austenitic stainless steels, their longer service life and reduced maintenance requirements often result in cost savings over the lifespan of the piping system.

High Resistance to Stress Corrosion Cracking (SCC): Duplex steels, including UNS S31803, have superior resistance to stress corrosion cracking, which is a common issue in many corrosive environments.

Overall, the combination of corrosion resistance, high strength, and other advantageous properties makes Duplex Steel UNS S31803 pipes an attractive choice for various demanding industrial applications.

Duplex Steel UNS S31803 Pipes Specifications and Sizes

Duplex Steel UNS S31803 pipes boast a remarkable blend of austenitic and ferritic stainless steels, offering superior corrosion resistance and strength. These pipes are meticulously crafted to meet stringent industry standards, ensuring reliability in diverse applications. With sizes ranging from small diameters to large ones, they cater to varied industrial needs seamlessly. Their specifications include precise dimensions, wall thickness, and material composition, ensuring optimal performance in demanding environments.

Furthermore, the versatility of Duplex Steel UNS S31803 pipes extends to their compatibility with different welding techniques, enhancing ease of installation and maintenance. Their exceptional resistance to pitting and crevice corrosion makes them ideal for use in aggressive chemical and marine environments. Available in a range of sizes, these pipes facilitate efficient fluid transportation across industries while maintaining structural integrity and longevity. Whether in offshore platforms, chemical plants, or desalination facilities, they serve as reliable conduits for various fluids, underscoring their indispensable role in modern engineering applications.

Plates Specifications ASTM A240 / ASME SA240, BS EN 10088-2, en 10028-7, IS 6911
Plates Dimension Standard MSRR, AMS, BS, JIS, AISI, ASTM, GB, DIN, EN, etc
DSS Plates Thickness 4mm-100mm
DSS Plates Width 1000mm, 1219mm, 1500mm, 1800mm, 2000mm etc
DSS Plates Length 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc
DSS Plates Thickness 0.1, 0.2/0.3/0.5/0.6/0.7/0.8/0.9/1.0/1.5, 2.0/2.5/3.0/4.0/5.0/6.0/8.0/9/10/12/16/18/20/ 22/25/30 mm
International Standard of Duplex Stainless Steel Plates ASTM A480
EN ISO 9445
EN ISO 18286
EN 10051
EN 10088-1
ISO 15510
Tolerances (width / thickness) of Duplex Stainless Steel Plates EN 10258/ DIN 59381
EN 10151 ASME SA240 DSS Plate
EN 10088 SA240 Plate
Finish of DSS Plates 2B, 2D, BA NO (8), Cold rolled Plate (CR), Hot rolled plate (HR), Checkered, No.4, BA, 8K, satin, mirror etc.
Hardness Half Hard, Soft, Hard, Quarter Hard, Spring Hard
Value Added Service Cladding, Heat Treatment, Annealed, Pickling, Polish, Rolling, Cutting, Bending, Forging, Minor Fabrication Etc.
Duplex Stainless Steel Profiling Plasma Plate Cutting
Laser Plate Cutting
Oxy-propane Flame Cutting

Types Of Duplex Stainless Steel S31803 Plate


Duplex Steel S31803 Hot Rolled Plate


Duplex Steel S31803 Cold Rolled Plate


Duplex Steel S31803 Chequered Plate


Duplex Steel S31803 Polished Plate


Duplex Steel S31803 2B Finish Plate


Duplex Steel S31803 Plain Plate


Other Types Of Duplex Steel S31803 Plates

DSS S31803 Chequered Plate Duplex Steel S31803 Cold Rolled Plate
20 Gauge Duplex Steel S31803 Plate Duplex Steel S31803 High Performance Plate
Precision Ground Duplex Stainless S31803 Plate Extra-Heavy Duplex Stainless S31803 Plate
S31803 Chequered Duplex Steel Plate Duplex Steel F51 Thik Plates
F51 Duplex Stainless Steel Plate 10 Gauge Duplex Steel S31803 Plate
DSS S31803 Plain Plates Duplex Stainless S31803 2B Finish Plates
ASME SA240 Duplex Steel S31803 Cold Rolled Plates ASTM A240 Duplex Steel S31803 Plates
Duplex Stainless Steel S31803 Plates Cut To Size Polished Duplex Stainless Steel S31803 Plate
Duplex Steel S31803 BA Finish Plates Duplex Steel S31803 HR Plates
Quality Duplex Steel S31803 Plate Duplex Stainless Steel S31803 CR Plates
Duplex Steel S31803 Custom Length Plate Custom Duplex Stainless Steel S31803 Plates

UNS S31803 Plates Equivalent Grade

S31803 1.4462 S31803 4462-318-03-I

Duplex Steel UNS S31803 Pipes Chemical Composition

Duplex Steel UNS S31803 pipes typically exhibit a chemical composition characterized by a balanced combination of austenitic and ferritic phases. Generally, they contain around 22% chromium, 5-6% nickel, 3-4% molybdenum, and 0.1-0.3% nitrogen, enhancing their corrosion resistance and mechanical properties. Additionally, they may have small amounts of other elements such as manganese, silicon, and copper to further refine their properties. This composition grants UNS S31803 pipes excellent resistance to various corrosive environments, high strength, and good weldability, making them suitable for diverse applications in industries like oil and gas, chemical processing, and marine engineering.

UNS Designation Type Composition, % B
C Mn P S Si Cr Ni N Mo Other Elements C
S31803 . . . 0.030 2.00 0.030 0.020 1.00 21.0-23.0 4.5-6.5 0.08-0.20 2.5-3.5 . . .

Duplex Steel UNS S31803 Pipes Mechanical Properties

Duplex Steel UNS S31803 pipes exhibit excellent mechanical properties, characterized by high tensile strength, typically ranging from 620 to 800 MPa. They also possess impressive yield strength, often falling between 450 to 620 MPa. Additionally, these pipes demonstrate good elongation values, typically around 25% or more, ensuring ductility. Their superior mechanical properties make them ideal for demanding applications in various industries such as oil and gas, chemical processing, and marine engineering.

UNS Designation Type Condition Tensile Strength, min, ksi [MPa] Yield Strength,A min, ksi [MPa] Elongation in 2 in. [50 mm] or 4D, min, % Reduction of Area, min, %B,C Brinell Hardness, max
S31803 . . . annealed 90 [620] 65 [450] 25 . . . 290

Applications of Duplex Steel UNS S31803 Pipes

Duplex steel UNS S31803 pipes find applications across various industries due to their excellent combination of mechanical properties and corrosion resistance. Here are some common applications:

Oil and Gas Industry: Duplex steel pipes are widely used in oil and gas exploration, production, and refining due to their resistance to corrosion, high strength, and ability to withstand high-pressure environments.

Chemical Processing: They are used in chemical processing plants for handling corrosive fluids and gases. Duplex steel pipes can withstand the harsh conditions found in chemical processing industries, including high temperatures and corrosive environments.

Desalination Plants: In desalination plants, where seawater is converted into freshwater, duplex steel pipes are used for their resistance to chloride-induced stress corrosion cracking (SCC) and pitting corrosion.

Pulp and Paper Industry: Duplex steel pipes are employed in pulp and paper mills for transporting corrosive chemicals used in the paper-making process. Their corrosion resistance and durability make them ideal for such applications.

Marine Applications: Due to their resistance to seawater corrosion, duplex steel pipes are used in marine environments for various applications such as offshore platforms, shipbuilding, and seawater intake and outfall systems.

Water Treatment: Duplex steel pipes are utilized in water treatment plants for conveying water and chemicals. Their corrosion resistance and longevity make them suitable for this critical application.

Construction: In construction, duplex steel pipes are used for structural purposes in buildings and infrastructure where corrosion resistance and high strength are required.

Overall, duplex steel UNS S31803 pipes are versatile and find applications in industries where corrosion resistance, strength, and durability are paramount.

Electrical Industry


Automotive Industry


Construction Industry


Defence Industry


Pharmaceutical Industry


Petroleum Industry


Petrochemical Industry


Milk & Dairy Industry

Milk & Dairy

Export & Supply Destinations Of Duplex S31803 Plates

Austria, Azerbaijan, Belarus, Belgium, Bulgaria, Croatia, Cyprus, Czechia/Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Netherlands, Norway, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom.

Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, British, China, Egypt, Hong Kong, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kuwait, Kyrgyzstan, Lebanon, Macau, Malaysia, Maldives, Mongolia, Myanmar, Nepal, North Korea, Oman, Philippines, Qatar, Russia, Saudi Arabia, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, Turkey, United Arab Emirates, Vietnam.

Algeria, Angola, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Egypt, Eswatini, Ethiopia, Gambia, Kenya, Liberia, Libya, Madagascar, Mauritania, Mauritius, Morocco, Mozambique, Namibia, Niger, Nigeria, Rwanda, Senegal, Seychelles, South Africa, Tanzania, Tunisia, Uganda, Zambia, Zimbabwe.

Antigua and Barbuda, Bahamas, Barbados, Belize, Canada, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States of America.

Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.