Calico Metal Alloys LLP is a trusted supplier and exporter of Duplex Steel UNS S31803 Bars in India. With a commitment to excellence and customer satisfaction, we stand as a reliable source for businesses seeking top-notch materials for their industrial needs. Leveraging expertise and stringent quality standards, we provide a diverse range of products tailored to meet various specifications. As a leading supplier in the market, we ensure prompt delivery and competitive pricing, making us the preferred choice for those seeking superior Duplex Steel solutions.

What are Duplex Steel UNS S31803 Bars?

Duplex Steel UNS S31803 Bars are a type of duplex stainless steel known for their excellent combination of strength and corrosion resistance. They consist primarily of austenitic and ferritic phases, offering high mechanical strength and good weldability. These bars are widely used in various industries such as chemical processing, oil and gas, and marine engineering due to their superior performance in harsh environments. UNS S31803 bars exhibit resistance to chloride-induced stress corrosion cracking, making them ideal for applications where exposure to corrosive elements is a concern.

Duplex Steel UNS S31803 Bars

Manufacturing Process Of Duplex S31803 Bars


The first step in the process is melting raw materials in an electric furnace. These raw materials are typically iron ore, chromium, nickel, and other elements in exact amounts.


After melting, the metal is put into molds to form slabs or billets. The processing of these first forms is then continued.

Hot Rolling

After being heated, the billets are shaped into long, thin rods by going through a series of rolling mills. Because the metal is heated above its recrystallization temperature during this operation, it is known as hot rolling.


After that, the rods are annealed to reduce stress and enhance machinability. In order to do this, the rods must first be heated to a certain temperature and then gradually cooled.


Lastly, shearing machines or other cutting techniques are used to cut the rods to the required length.

Duplex Steel UNS S31803 Bars Specifications and Sizes:

Duplex Steel UNS S31803 bars are renowned for their exceptional strength and corrosion resistance, making them a preferred choice across various industries. These bars typically come in a range of sizes and specifications to meet diverse application requirements. Commonly manufactured in round, square, hexagonal, or flat shapes, these bars exhibit excellent weldability and formability, enhancing their versatility in engineering projects.

Typically available in sizes ranging from 5 mm to 500mm in diameter, duplex steel UNS S31803 bars are utilized in critical applications such as chemical processing, oil and gas exploration, marine engineering, and more. Their high tensile strength, coupled with superior resistance to corrosion and pitting, ensures reliable performance even in harsh environments. Additionally, these bars adhere to international standards such as ASTM, ASME, and AISI, guaranteeing consistency and quality across different batches.

Standard ASTM A276, ASME SA276
Round Bars Outside Diameter in the range of 4mm to 500mm
Bright Bars Outside Diameter in the range of 4mm to 100mm
Hex Bars 18mm – 57mm (11/16″ to 2-3/4″)
Square Bars 18mm – 47mm (11/16″ to 1-3/4″)
Flat Bars 1/2” to 10” in thickness range of 2mm to 150mm,
Size 6 mm to 120 mm.
Diameter 6mm to 350mm Diameter
Length 1 to 6 Meters, Custom Cut Lengths
Finish Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish
Form Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc
Tolerance +/-0.2mm

Types Of Duplex Stainless Steel S31803 Bars


Duplex Steel S31803 Square Bar


Duplex Steel S31803 Bright Bar


Duplex Steel S31803 Flat Bar


Duplex Steel S31803 Forged Bar


Duplex Steel S31803 Cold Drawn Round Bar


Duplex Steel S31803 Rod


Other Types Of Duplex Steel S31803 Bars

DSS S31803 Bars Duplex Steel S31803 Hexagonal Bar
Duplex Steel S31803 Threaded Rod Duplex Steel S31803 Industrial Bars
Precision Ground Duplex Stainless S31803 Bars Duplex Steel F51 Round Bar
S31803 Duplex Stainless Steel Bars UNS S31803 Square Bar
F51 Duplex Stainless Steel Bars Duplex Stainless Steel F51 Rod
DSS S31803 Hot Rolled Bar Duplex Steel S31803 Half-Round Bar
ASME SA276 Duplex Steel S31803 Precision Ground Bar ASTM A276 Duplex Steel S31803 Bars
Duplex Stainless Steel S31803 Rectangular Bar Duplex Steel S31803 Cold Finish Round Bar
Duplex Steel S31803 Polished Bar S31803 Duplex Steel Half-Round Bars

UNS S31803 Bars Equivalent Grade

S31803 1.4462 S31803 4462-318-03-I

Duplex Steel UNS S31803 Bars Chemical Composition:

UNS S31803 is a duplex stainless steel known for its excellent corrosion resistance and high strength. Its chemical composition typically includes around 22% chromium, 5-6% nickel, 3% molybdenum, and approximately 0.2% nitrogen. This composition imparts superior resistance to chloride stress corrosion cracking and provides good mechanical properties. Additionally, it offers a balanced combination of ferrite and austenite phases, ensuring high toughness and ductility.

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 S32205 Bars Mechanical Properties:

UNS S32205 duplex steel bars typically exhibit excellent mechanical properties, including a high tensile strength of around 620 MPa and a yield strength of approximately 450 MPa. Additionally, they possess good elongation, typically ranging from 25% to 30%, ensuring ductility and toughness. These properties make them well-suited for various demanding applications in 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

Advantages of Duplex Steel UNS S31803 Bars

Duplex Steel UNS S31803, also known as 2205 duplex stainless steel, offers several advantages when used in the form of bars:

Corrosion Resistance: Duplex steel bars like UNS S31803 offer excellent resistance to corrosion, particularly in aggressive environments such as those containing chloride ions. This makes them suitable for use in marine applications, chemical processing plants, and oil and gas exploration.

High Strength: Duplex stainless steels exhibit higher strength compared to austenitic stainless steels. This allows for the use of thinner sections, reducing weight and cost while maintaining structural integrity.

Good Weldability: UNS S31803 has good weldability, which enables it to be easily fabricated into various shapes and structures. This makes it a preferred material for construction and manufacturing applications where welding is required.

Good Toughness and Ductility: Duplex steel bars exhibit good toughness and ductility, allowing them to withstand impact and shock loading without fracturing. This makes them suitable for use in applications where toughness is critical, such as in offshore platforms and structural components.

High Resistance to Stress Corrosion Cracking: Duplex stainless steels like UNS S31803 have a higher resistance to stress corrosion cracking compared to austenitic stainless steels. This property is particularly beneficial in environments where the material is subjected to tensile stresses in corrosive conditions.

Cost-Effective Alternative: While duplex stainless steels may have a higher initial cost compared to austenitic stainless steels, their superior mechanical properties and corrosion resistance often result in long-term cost savings due to reduced maintenance, repair, and replacement costs.

Overall, the combination of corrosion resistance, high strength, good weldability, and cost-effectiveness makes Duplex Steel UNS S31803 bars a versatile and reliable material for a wide range of industrial applications.

Applications of Duplex Steel UNS S31803 Bars

Duplex stainless steel UNS S31803, also known as Duplex 2205, offers a combination of excellent corrosion resistance, high strength, and good weldability, making it suitable for a wide range of applications, including the following:

Oil and Gas Industry: Duplex steel bars are used in various components within the oil and gas industry, such as pipelines, offshore platforms, and subsea equipment, where they provide resistance to corrosion from seawater, hydrogen sulfide, and chloride environments.

Chemical Processing: Duplex stainless steel bars are utilized in chemical processing equipment, including reactors, tanks, heat exchangers, and piping systems, where they can withstand highly corrosive environments and high temperatures.

Pulp and Paper Industry: The pulp and paper industry employs duplex steel bars for digester and bleaching equipment, where they offer resistance to both corrosion and erosion in acidic environments.

Desalination Plants: Duplex stainless steel bars are used in desalination plants for seawater intake systems, piping, and heat exchangers due to their resistance to corrosion from chloride ions and high temperatures.

Water Treatment: Duplex steel bars find applications in water treatment facilities for piping systems, pumps, and valves, where they offer resistance to corrosion from chlorides and other aggressive chemicals commonly used in water treatment processes.

Food Processing: In the food and beverage industry, duplex stainless steel bars are utilized in equipment such as tanks, pipes, and storage vessels due to their resistance to corrosion from food acids and cleaning chemicals, as well as their hygienic properties.

These are just a few examples of the many applications where Duplex Steel UNS S31803 bars can be utilized due to their unique combination of properties.

Why Choose Calico Metal Alloy Pvt Ltd?

Calico Metal Alloy Pvt Ltd stands out for its commitment to excellence in the manufacturing and distribution of metal alloys. With a proven track record of delivering high-quality products tailored to diverse industrial needs, Calico Metal Alloy Pvt Ltd prioritizes customer satisfaction and reliability. Their state-of-the-art facilities, stringent quality control measures, and a team of skilled professionals ensure consistency and precision in every product. Additionally, the company's dedication to innovation and continuous improvement sets it apart as a trusted partner for clients worldwide.

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 Round Bar

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

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

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

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

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