Calico Metal Alloys LLP is a premier supplier and Exporter of Duplex Steel UNS S31803 Coils in India. Renowned for our commitment to excellence, we specialize in delivering top-quality duplex steel coils tailored to meet your specific needs. With a steadfast dedication to quality and reliability, we have become a trusted name in the industry, serving clients across various sectors. Experience our unparalleled service and superior products as we strive to exceed your expectations.

What is Duplex Steel UNS S31803 Coils?

Duplex Steel UNS S31803 Coils refer to a type of stainless steel coils composed primarily of austenitic and ferritic phases. This material offers excellent strength, corrosion resistance, and durability, making it suitable for various industrial applications, especially in aggressive environments such as chemical processing, oil and gas, and marine industries. These coils exhibit a balanced combination of mechanical properties and are known for their high resistance to pitting and crevice corrosion. UNS S31803 is a common grade within the duplex stainless steel family, characterized by its good weldability and formability.

Duplex Steel UNS S31803 Coils

Manufacturing Process Of Duplex S31803 Coils

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 Coils

Duplex steel UNS S31803 coils offer several advantages due to their unique composition and properties:

High Strength: Duplex stainless steels like UNS S31803 offer excellent strength, making them suitable for various applications where structural integrity is critical.

Corrosion Resistance: These coils exhibit good resistance to corrosion, especially in harsh environments such as marine and chemical processing applications. They provide better corrosion resistance compared to austenitic stainless steels, particularly in chloride-containing environments.

Stress Corrosion Cracking (SCC) Resistance: Duplex stainless steels demonstrate resistance to stress corrosion cracking, which is a significant advantage in applications subjected to tensile stress and corrosive environments.

Good Weldability: UNS S31803 coils can be readily welded using common techniques, which enhances their usability in fabrication processes. This facilitates construction and maintenance activities, reducing downtime and costs.

High Toughness: These coils offer high toughness and ductility, making them suitable for applications requiring impact resistance, such as pressure vessels and structural components.

Cost-Effectiveness: Despite their superior properties, duplex stainless steels can often be more cost-effective than some high-performance alloys, providing a balance between performance and affordability over the long term.

Overall, the advantages of Duplex steel UNS S31803 coils make them an attractive choice for a wide range of industrial applications where strength, corrosion resistance, and cost-effectiveness are paramount considerations.

Duplex Steel S31803 Coil Specifications

Specifications ASTM A240 / ASME SA240
Dimensions ASTM, ASME, and API
Width 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc
Thickness 4mm-100mm
Length 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc
Surface Finish 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, hairline, sand blast, Brush, etching, Hot rolled coil (HR), Cold rolled coil (CR), SATIN (Met with Plastic Coated) etc
Hardness Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.
Form Coils, Foils, Rolls, Plain Coil, Shim Coil, Strip

Types Of Duplex Stainless Steel S31803 Coil


Duplex Steel S31803 Hot Rolled Coil


Duplex Steel S31803 Cold Rolled Coil


Duplex Steel S31803 Foils


Duplex Steel S31803 Plain Coil


Duplex Steel S31803 Shim Coil


Duplex Steel S31803 Slit Coil


Other Types Of Duplex Steel S31803 Coils

DSS S31803 Coils Duplex Steel S31803 Cold Rolled Coil
2D Finish Duplex Steel S31803 Coil Duplex Steel S31803 BA Finish Coils
Duplex Stainless S31803 Foils S31803 Duplex Steel Plain Coil
S31803 Duplex Steel Shim Coils Duplex Steel F51 Strip
F51 Duplex Stainless Steel Coils Duplex Steel S31803 2D Finish Coils
DSS S31803 Coils Duplex Stainless S31803 2B Finish Coils
ASME SA240 Duplex Steel S31803 Cold Rolled Coils ASTM A240 Duplex Steel S31803 Coil
S31803 Duplex Matt PVC Coils Duplex Stainless Steel S31803 Slit Coils
F51 Slit Coils Duplex Steel S31803 HR Coils
Cut To Size Duplex Steel S31803 Coils Duplex Steel S31803 Industrial Coils

Duplex Steel UNS S31803 Coils Equivalent Grade

Duplex Steel UNS S31803 Coils typically exhibit an equivalent grade range including ASTM A240, ASME SA240, and EN 1.4462. These coils offer a combination of high strength and corrosion resistance, making them suitable for various applications in industries such as oil and gas, chemical processing, and marine environments. With excellent mechanical properties and resistance to stress corrosion cracking, these coils are favored for their versatility and durability in demanding conditions. Additionally, they are often used in structural components, heat exchangers, and piping systems where both strength and corrosion resistance are paramount.

S31803 1.4462 S31803 4462-318-03-I

Duplex Steel UNS S31803 Coils Chemical Composition

Duplex Steel UNS S31803 Coils typically exhibit a chemical composition consisting of approximately 22% chromium, 5-6% nickel, 3% molybdenum, and 0.15-0.30% nitrogen. This composition provides excellent corrosion resistance, high strength, and good weldability. Additionally, it offers improved resistance to stress corrosion cracking and pitting in chloride environments compared to austenitic stainless steels. These coils find applications in various industries including oil and gas, chemical processing, and marine engineering due to their favorable properties.

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 Coils Mechanical Properties

UNS S31803 Duplex Steel coils typically exhibit excellent mechanical properties, including high tensile strength, good impact toughness, and superior resistance to stress corrosion cracking. With a dual-phase microstructure consisting of austenite and ferrite, these coils offer a unique combination of strength and corrosion resistance. They possess a yield strength of around 450 MPa and a tensile strength exceeding 620 MPa, making them suitable for various demanding applications in industries such as oil and gas, chemical processing, and marine engineering. Additionally, they demonstrate favorable ductility and hardness characteristics, contributing to their widespread use in critical environments.

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

Why choose Calico Metal Alloy Pvt Ltd?

Calico Metal Alloy Pvt Ltd stands out for its exceptional quality and reliability in manufacturing metal alloys. With state-of-the-art facilities and a commitment to innovation, we consistently deliver products that meet stringent industry standards. Our extensive range of alloys caters to diverse industrial needs, ensuring versatility and flexibility for our clients. Additionally, our dedication to customer satisfaction, timely delivery, and competitive pricing make us a preferred choice in the market. Our proven track record of excellence and adherence to strict quality control measures make us an ideal partner for businesses seeking top-tier metal alloy solutions.

Applications of Duplex Steel UNS S31803 Coils

Duplex Steel UNS S31803 coils, also known as Duplex 2205, are a type of stainless steel with a dual microstructure consisting of austenitic and ferritic phases. This composition gives them a unique combination of properties, making them suitable for various applications in different industries. Some of the common applications of Duplex Steel UNS S31803 coils include:

Chemical and Petrochemical Processing: Due to their excellent resistance to corrosion, Duplex Steel UNS S31803 coils are widely used in chemical processing plants for equipment such as heat exchangers, pressure vessels, tanks, piping, and valves. They offer resistance to corrosion from various chemicals, acids, and chlorides, making them suitable for harsh environments.

Oil and Gas Industry: Duplex Steel UNS S31803 coils find applications in the oil and gas industry, particularly in offshore and subsea environments where corrosion resistance and strength are critical. They are used in pipelines, offshore platforms, heat exchangers, and other equipment subjected to corrosive environments and high-pressure conditions.

Desalination Plants: With their resistance to chloride-induced stress corrosion cracking and pitting, Duplex Steel UNS S31803 coils are utilized in the construction of desalination plants. They are used in evaporators, brine heaters, piping, and other components exposed to seawater and brine.

Water Treatment: Duplex Steel UNS S31803 coils are employed in water treatment facilities for various applications, including filtration systems, water storage tanks, and piping, where resistance to corrosion and high strength are required.

Structural Applications: Due to their high mechanical strength and good weldability, Duplex Steel UNS S31803 coils are used in structural applications such as building and bridge construction, where a combination of strength and corrosion resistance is essential.

Marine Industry: In marine applications, Duplex Steel UNS S31803 coils are used for components such as boat shafts, propellers, and fittings due to their resistance to corrosion in seawater environments.

These are just a few examples of the diverse applications of Duplex Steel UNS S31803 coils across different industries. Their unique combination of properties makes them highly versatile and valuable in environments where both corrosion resistance and mechanical strength are crucial.

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 Coils

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.